Teledyne Carbon Monoxide Alarm gfc 7000ta User Manual
MODEL GFC 7000TA  
CARBON DIOXIDE ANALYZER  
Operation Manual  
Also supports operation of:  
GFC 7000T CO2 Analyzer  
(when used in conjunction with GFC 7000T Addendum, PN 07273)  
P/N M07272  
DATE 06/04/13  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
16830 Chestnut Street  
City of Industry, CA 91748  
Telephone: (626) 934-1500  
Fax: (626) 961-2538  
Web: www.teledyne-ai.com  
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Safety Messages  
Model GFC7000TA Carbon Dioxide Analyzer  
SAFETY MESSAGES  
Important safety messages are provided throughout this manual for the purpose of avoiding personal  
injury or instrument damage. Please read these messages carefully. Each safety message is associated  
with a safety alert symbol, and are placed throughout this manual; the safety symbols are also located  
inside the instrument. It is imperative that you pay close attention to these messages, the  
descriptions of which are as follows:  
WARNING: Electrical Shock Hazard  
HAZARD: Strong oxidizer  
GENERAL WARNING/CAUTION: Read the accompanying message for  
specific information.  
CAUTION: Hot Surface Warning  
Do Not Touch: Touching some parts of the instrument without  
protection or proper tools could result in damage to the part(s) and/or the  
instrument.  
Technician Symbol: All operations marked with this symbol are to be  
performed by qualified maintenance personnel only.  
Electrical Ground: This symbol inside the instrument marks the central  
safety grounding point for the instrument.  
CAUTION  
This instrument should only be used for the purpose and in the manner  
described in this manual. If you use this instrument in a manner other than  
that for which it was intended, unpredictable behavior could ensue with  
possible hazardous consequences.  
NEVER use any gas analyzer to sample combustible gas(es)!  
Note: Technical Assistance regarding the use and maintenance of the GFC7001TA or  
any other Teledyne product can be obtained by contacting Teledyne Customer  
Service Department:  
Phone: 888-789-8168  
Email: [email protected]  
or by accessing various service options on our website at  
http://www.teledyne-ai.com/  
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Safety Messages  
Model GFC7000TA Carbon Dioxide Analyzer  
CONSIGNES DE SÉCURITÉ  
Des consignes de sécurité importantes sont fournies tout au long du présent manuel dans le but d’éviter  
des blessures corporelles ou d’endommager les instruments. Veuillez lire attentivement ces consignes.  
Chaque consigne de sécurité est représentée par un pictogramme d’alerte de sécurité; ces pictogrammes  
se retrouvent dans ce manuel et à l’intérieur des instruments. Les symboles correspondent aux  
consignes suivantes :  
AVERTISSEMENT : Risque de choc électrique  
DANGER : Oxydant puissant  
AVERTISSEMENT GÉNÉRAL  
/
MISE EN GARDE : Lire la consigne  
complémentaire pour des renseignements spécifiques  
MISE EN GARDE : Surface chaude  
Ne pas toucher : Toucher à certaines parties de l’instrument sans protection ou  
sans les outils appropriés pourrait entraîner des dommages aux pièces ou à  
l’instrument.  
Pictogramme « technicien » : Toutes les opérations portant ce symbole doivent  
être effectuées uniquement par du personnel de maintenance qualifié.  
Mise à la terre : Ce symbole à l’intérieur de l’instrument détermine le point central  
de la mise à la terre sécuritaire de l’instrument.  
MISE EN GARDE  
Cet instrument doit être utilisé aux fins décrites et de la manière décrite dans  
ce manuel. Si vous utilisez cet instrument d’une autre manière que celle pour  
laquelle il a été prévu, l’instrument pourrait se comporter de façon imprévisible  
et entraîner des conséquences dangereuses.  
NE JAMAIS utiliser un analyseur de gaz pour échantillonner des gaz  
combustibles!  
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Safety Messages  
Model GFC7000TA Carbon Dioxide Analyzer  
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Manual Information  
Model GFC7000TA Carbon Dioxide Analyzer  
ABOUT THIS MANUAL  
This manual, PN 07272, provides operation instructions for the GFC 7000TA Analyzer,  
and supports operation of the Model GFC 7000T (when used in conjunction with the  
GFC 7000T Addendum, PN 07273). This manual is comprised of multiple documents as  
listed below.  
Part No.  
07272  
05233  
06879  
04411  
05235  
Rev  
Name/Description  
GFC 7000TA Carbon Dioxide Analyzer Operation Manual  
Menu trees and software documentation (inserted as Appendix A of this manual)  
Spare Parts List (located in Appendix B, this manual)  
Recommended Spare Parts Stocking Levels  
A
H
1/4/2011  
M
C
Repair Request Questionnaire (inserted as Appendix C of this manual)  
Interconnects and Schematics included in Appendix D of this manual  
Interconnect Wire List (located in Appendix D of this manual)  
Interconnect Wiring Diagram (located in Appendix D of this manual)  
PCA, 03296, IR Photodetector Preamp and Sync Demodulator  
PCA, 03631, 0-20mA driver  
0691201  
069121  
03297  
03632  
04003  
04089  
04136  
04468  
05803  
06698  
06882  
06731  
B
B
K
A
N
A
B
B
B
D
B
A
PCA, 04003, Pressure/Flow Transducer Interface  
PCA, 04088, Opto Pickup Interface  
PCA, 04135 Rev A, Relay  
PCA, 04467, Analog Output Series Res  
SCH, PCA 05802, MOTHERBOARD, GEN-5  
SCH, PCA 06697, INTRFC, LCD TCH SCRN,  
SCH, LVDS TRANSMITTER BOARD  
SCH, AUXILLIARY-I/O BOARD  
NOTE  
Please read this manual in its entirety before operating the instrument.  
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Manual Information  
Model GFC7000TA Carbon Dioxide Analyzer  
2010, T360 Manual, PN0 Rev A, DCN  
Document  
PN  
Rev  
DCN  
Change Summary  
0xxxx  
X
Initial Release  
For the purpose of capturing this manual’s construct at its initial release, the following list documents the  
current Rev of each part comprising Rev A of this manual. Any future changes to this manual will be  
recorded in this Revision History section, most recent changes at the top. Their new Rev letters will be  
updated in the preceding About This Manual section:  
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Table of Contents  
Model GFC7000TA Carbon Dioxide Analyzer  
TABLE OF CONTENTS  
SAFETY MESSAGES ...............................................................................................................................................v  
CONSIGNES DE SÉCURITÉ................................................................................................................................... vi  
ABOUT this MANUAL .............................................................................................................................................. ix  
TABLE OF CONTENTS ........................................................................................................................................... xi  
1. INTRODUCTION........................................................................................................................................................1  
1.1. Features.............................................................................................................................................................1  
1.2. Using This Manual..............................................................................................................................................1  
2. SPECIFICATIONS AND APPROVALS.....................................................................................................................5  
2.1. Specifications .....................................................................................................................................................5  
2.2. CE Mark Compliance .........................................................................................................................................7  
3. GETTING STARTED .................................................................................................................................................9  
3.1. Unpacking and Initial Set Up..............................................................................................................................9  
3.2. Front Panel.......................................................................................................................................................11  
3.3. Rear Panel .......................................................................................................................................................15  
3.4. Internal Layout .................................................................................................................................................17  
3.5. Electrical Connections......................................................................................................................................19  
3.5.1. Power Connection ....................................................................................................................................20  
3.5.2. Connecting Analog Inputs (Option 64)......................................................................................................20  
3.5.3. Connecting Analog Outputs......................................................................................................................21  
3.5.4. Connecting the Status Outputs.................................................................................................................23  
3.5.5. Connecting the Control Inputs ..................................................................................................................24  
3.5.6. Connecting the Communications Interfaces .............................................................................................25  
3.6. Pneumatic Connections ...................................................................................................................................25  
3.6.1. Basic Pneumatic Connections ..................................................................................................................26  
3.6.2. Connections with Internal Valve Options Installed....................................................................................30  
3.6.3. Pneumatic Connections in Multipoint Calibration Applications..................................................................32  
3.6.4. Setting the Internal Purge Air Pressure ....................................................................................................32  
3.7. Initial Operation ................................................................................................................................................33  
3.7.1. Startup......................................................................................................................................................33  
3.7.2. Warm Up...................................................................................................................................................34  
3.7.3. Warning Messages...................................................................................................................................34  
3.7.4. Functional Check......................................................................................................................................36  
3.8. Initial Calibration Procedure .............................................................................................................................37  
3.8.1. Initial O2 Sensor Calibration Procedure ....................................................................................................40  
4. FREQUENTLY ASKED QUESTIONS .....................................................................................................................45  
4.1. FAQ’s ...............................................................................................................................................................45  
4.2. Glossary...........................................................................................................................................................46  
5. OPTIONAL HARDWARE AND SOFTWARE ..........................................................................................................51  
5.1. Rack Mount Kits (Options 20A, 20B, 21 and 23)..............................................................................................51  
5.2. Current Loop Analog Outputs (Option 41)........................................................................................................51  
5.2.1. Converting Current Loop Analog Outputs to Standard Voltage Outputs...................................................52  
5.3. Expendable Kits (Options 42C, 42D and 43)....................................................................................................53  
5.4. Calibration Valves Options...............................................................................................................................54  
5.4.1. Ambient Zero/Pressurized Span Valve.....................................................................................................54  
5.4.2. Ambient Zero/Ambient Span Valve...........................................................................................................55  
5.5. Communication Options...................................................................................................................................57  
5.5.1. Communications Cables...........................................................................................................................57  
5.5.2. RS-232 Multidrop (Option 62)...................................................................................................................57  
5.6. Oxygen Sensor (OPT 65).................................................................................................................................58  
5.6.1. Theory of Operation..................................................................................................................................58  
5.7. Special Features ..............................................................................................................................................61  
5.7.1. Dilution Ratio Option.................................................................................................................................61  
5.7.2. Maintenance Mode Switch........................................................................................................................61  
5.7.3. Second Language Switch .........................................................................................................................61  
6. OPERATING INSTRUCTIONS................................................................................................................................63  
6.1. Overview of Operating modes..........................................................................................................................63  
6.2. Sample Mode ...................................................................................................................................................64  
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6.2.1. Test Functions ..........................................................................................................................................65  
6.2.2. Warning Messages...................................................................................................................................67  
6.3. Calibration Mode ..............................................................................................................................................68  
6.4. SETUP MODE..................................................................................................................................................69  
6.5. SETUP CFG: Viewing the Analyzer’s Configuration Information .................................................................70  
6.6. SETUP ACAL: Automatic Calibration ..........................................................................................................70  
6.7. SETUP DAS: Using the Data Acquisition System (DAS).............................................................................71  
6.7.1. DAS Structure...........................................................................................................................................72  
6.7.2. Default DAS Channels..............................................................................................................................74  
6.7.3. Remote DAS Configuration.......................................................................................................................88  
6.8. SETUP RNGE: Analog Output Reporting Range Configuration ..................................................................89  
6.8.1. Physical Range versus Analog Output Reporting Ranges........................................................................90  
6.8.2. Reporting Range Modes...........................................................................................................................90  
6.8.3. Single Range Mode (SNGL) .....................................................................................................................92  
6.8.4. Dual Range Mode (DUAL)........................................................................................................................93  
6.8.5. Auto Range Mode (AUTO)........................................................................................................................94  
6.8.6. Range Units..............................................................................................................................................95  
6.8.7. Dilution Ratio ............................................................................................................................................96  
6.9. SETUP PASS: Password Feature ...............................................................................................................97  
6.10. SETUP CLK: Setting the Internal Time-of-Day Clock ................................................................................99  
6.11. SETUP MORECOMM: Using the Analyzer’s Communication Ports....................................................101  
6.11.1. Analyzer ID ...........................................................................................................................................101  
6.11.2. COM Port Default Settings....................................................................................................................102  
6.11.3. RS-485 Configuration of COM2............................................................................................................105  
6.11.4. DTE and DCE Communication .............................................................................................................105  
6.11.5. COM Port Communication Modes ........................................................................................................106  
6.11.6. Remote Access via the Ethernet...........................................................................................................108  
6.11.7. Multidrop RS-232 Set Up......................................................................................................................114  
6.11.8. COM Port Baud Rate............................................................................................................................116  
6.11.9. COM Port Testing.................................................................................................................................117  
6.12. SETUP MORE VARS: Internal Variables (VARS)...............................................................................118  
6.13. SETUP MORE DIAG: Using the Diagnostics Functions.....................................................................120  
6.13.1. Accessing the Diagnostic Features.......................................................................................................121  
6.13.2. Signal I/O..............................................................................................................................................121  
6.13.3. Analog Output Step Test ......................................................................................................................122  
6.13.4. Analog I/O Configuration ......................................................................................................................123  
6.13.5. Electric Test..........................................................................................................................................136  
6.13.6. Dark Calibration Test............................................................................................................................137  
6.13.7. Pressure Calibration .............................................................................................................................138  
6.13.8. Flow Calibration....................................................................................................................................139  
6.13.9. Test Channel Output.............................................................................................................................140  
6.14. SETUP MORE ALRM: Using the Gas Concentration Alarms...............................................................141  
6.14.1. Setting the Concentration Alarm Limits.................................................................................................142  
6.15. Remote Operation of the Analyzer ...............................................................................................................142  
6.15.1. Remote Operation Using the External Digital I/O..................................................................................142  
6.15.2. Remote Operation Using the External Serial I/O ..................................................................................146  
6.15.3. Additional Communications Documentation .........................................................................................153  
6.15.4. Using the GFC 7000TA with a Hessen Protocol Network.....................................................................153  
7. CALIBRATION PROCEDURES ............................................................................................................................161  
7.1. Before Calibration...........................................................................................................................................161  
7.1.1. Zero Air and Span Gas...........................................................................................................................161  
7.1.2. Calibration Gas Traceability....................................................................................................................162  
7.1.3. Data Recording Devices.........................................................................................................................162  
7.2. Manual Calibration without Zero/Span Valves................................................................................................162  
7.3. Manual Calibration Checks ............................................................................................................................165  
7.4. Manual Calibration with Zero/Span Valves.....................................................................................................166  
7.5. Manual Calibration Checks with Zero/Span Valves........................................................................................171  
7.5.1. Zero/Span Calibration on Auto Range or Dual Ranges ..........................................................................172  
7.5.2. Use of Zero/Span Valves with Remote Contact Closure ........................................................................173  
7.6. Automatic Zero/Span Cal/Check (AutoCal)....................................................................................................173  
7.6.1. AutoCal with Auto or Dual Reporting Ranges Modes Selected ..............................................................176  
7.7. Calibration Quality..........................................................................................................................................176  
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8. MAINTENANCE SCHEDULE & PROCEDURES ..................................................................................................179  
8.1. Maintenance Schedule...................................................................................................................................179  
8.2. Predicting Failures Using the Test Functions.................................................................................................183  
8.3. Maintenance Procedures ...............................................................................................................................184  
8.3.1. Replacing the Sample Particulate Filter..................................................................................................184  
8.3.2. Rebuilding the Sample Pump .................................................................................................................185  
8.3.3. Performing Leak Checks ........................................................................................................................185  
8.3.4. Performing a Sample Flow Check ..........................................................................................................186  
8.3.5. Cleaning the Optical Bench ....................................................................................................................186  
8.3.6. Cleaning Exterior Surfaces of the GFC 7000TA .....................................................................................186  
9. THEORY OF OPERATION....................................................................................................................................187  
9.1. Measurement Method ....................................................................................................................................187  
9.1.1. Beer’s Law..............................................................................................................................................187  
9.1.2. Measurement Fundamentals ..................................................................................................................187  
9.1.3. Gas Filter Correlation..............................................................................................................................188  
9.1.4. Interference and Signal to Noise Rejection.............................................................................................190  
9.2. Pneumatic Operation......................................................................................................................................193  
9.2.1. Sample Gas Flow ...................................................................................................................................194  
9.2.2. Flow Rate Control...................................................................................................................................194  
9.2.3. Purge Gas Pressure Control...................................................................................................................196  
9.2.4. Particulate Filter......................................................................................................................................196  
9.2.5. Pneumatic Sensors.................................................................................................................................196  
9.3. Electronic Operation.......................................................................................................................................197  
9.3.1. Overview.................................................................................................................................................197  
9.3.2. CPU........................................................................................................................................................199  
9.3.3. Optical Bench & GFC Wheel ..................................................................................................................200  
9.3.4. Synchronous Demodulator (Sync/Demod) Assembly.............................................................................202  
9.3.5. Relay Board............................................................................................................................................205  
9.3.6. Mother Board..........................................................................................................................................207  
9.3.7. I2C Data Bus...........................................................................................................................................210  
9.3.8. Power Supply/ Circuit Breaker................................................................................................................211  
9.4. Front Panel Touchscreen/Display Interface ...................................................................................................212  
9.4.1. LVDS Transmitter Board.........................................................................................................................212  
9.4.2. Front Panel Touchscreen/Display Interface PCA....................................................................................212  
9.5. Software Operation ........................................................................................................................................213  
9.5.1. Adaptive Filter.........................................................................................................................................213  
9.5.2. Calibration - Slope and Offset.................................................................................................................214  
9.5.3. Measurement Algorithm..........................................................................................................................214  
9.5.4. Temperature and Pressure Compensation.............................................................................................215  
9.5.5. Internal Data Acquisition System (DAS) .................................................................................................215  
10. TROUBLESHOOTING & REPAIR PROCEDURES ............................................................................................217  
10.1. General Troubleshooting Hints.....................................................................................................................217  
10.1.1. Interpreting WARNING Messages........................................................................................................218  
10.1.2. Fault Diagnosis with TEST Functions...................................................................................................221  
10.1.3. Using the Diagnostic Signal I/O Function .............................................................................................223  
10.1.4. Internal Electronic Status LEDs ............................................................................................................224  
10.2. Gas Flow Problems......................................................................................................................................228  
10.2.1. GFC 7000TA Internal Gas Flow Diagrams ...........................................................................................229  
10.2.2. Typical Sample Gas Flow Problems.....................................................................................................232  
10.2.3. Poor or Stopped Flow of Purge Gas.....................................................................................................234  
10.3. Calibration Problems....................................................................................................................................235  
10.3.1. Miscalibrated.........................................................................................................................................235  
10.3.2. Non-Repeatable Zero and Span...........................................................................................................236  
10.3.3. Inability to Span – Touchscreen SPAN Button Not Visible ...................................................................236  
10.3.4. Inability to Zero – Touchscreen ZERO Button Not Visible ....................................................................237  
10.4. Other Performance Problems.......................................................................................................................238  
10.4.1. Temperature Problems.........................................................................................................................238  
10.4.2. Excessive Noise ...................................................................................................................................240  
10.5. Subsystem Checkout ...................................................................................................................................241  
10.5.1. AC Mains Configuration........................................................................................................................241  
10.5.2. DC Power Supply .................................................................................................................................241  
10.5.3. I2C Bus..................................................................................................................................................242  
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Model GFC7000TA Carbon Dioxide Analyzer  
10.5.4. Touchscreen Interface..........................................................................................................................242  
10.5.5. LCD Display Module.............................................................................................................................242  
10.5.6. Relay Board..........................................................................................................................................243  
10.5.7. Sensor Assembly..................................................................................................................................243  
10.5.8. Motherboard .........................................................................................................................................245  
10.5.9. CPU......................................................................................................................................................249  
10.5.10. RS-232 Communications....................................................................................................................249  
10.6. Repair Procedures .......................................................................................................................................251  
10.6.1. Repairing Sample Flow Control Assembly............................................................................................251  
10.6.2. Removing/Replacing the GFC Wheel...................................................................................................252  
10.6.3. Disk-On-Module Replacement Procedure ............................................................................................253  
11. A PRIMER ON ELECTRO-STATIC DISCHARGE...............................................................................................255  
11.1. How Static Charges are Created..................................................................................................................255  
11.2. How Electro-Static Charges Cause Damage ...............................................................................................256  
11.3. Common Myths About ESD Damage...........................................................................................................257  
11.4. Basic Principles of Static Control..................................................................................................................257  
LIST OF APPENDICES  
APPENDIX A - VERSION SPECIFIC SOFTWARE DOCUMENTATION, L.8  
APPENDIX A-1: Models GFC 7000TA and GFC 7000E Software Menu Trees  
APPENDIX A-2: GFC 7000 Series Setup Variables  
APPENDIX A-3: GFC 7000 Series Warnings and Test Measurements  
APPENDIX A-4: GFC 7000 Series Signal I/O Definitions  
APPENDIX A-5: GFC 7000 Series DAS Triggering Events  
APPENDIX A-6: GFC 7000 Series DAS Parameters  
APPENDIX A-7: Terminal Command Designators  
APPENDIX A-8: Terminal Key Assignments  
APPENDIX A-9: GFC 7000 Series MODBUS Register  
APPENDIX B - SPARE PARTS LIST and RECOMMENDED SPARES STOCKING LEVELS  
APPENDIX C - REPAIR QUESTIONNAIRE  
APPENDIX D - ELECTRONIC SCHEMATICS  
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Table of Contents  
Model GFC7000TA Carbon Dioxide Analyzer  
LIST OF FIGURES  
Figure 3-1:  
Figure 3-2:  
Figure 3-3:  
Figure 3-4:  
Figure 3-5:  
Figure 3-6:  
Figure 3-7:  
Figure 3-8:  
Figure 3-9:  
Figure 3-10:  
Figure 3-11:  
Figure 3-12:  
Front Panel Layout......................................................................................................................11  
Display Screen and Touch Control .............................................................................................12  
Display/Touch Control Screen Mapped to Menu Charts.............................................................14  
Rear Panel Layout.......................................................................................................................15  
Internal Chassis Layout...............................................................................................................17  
Optical Bench Layout ..................................................................................................................18  
GFC 7000TA Internal Gas Flow..................................................................................................19  
Analog In Connector....................................................................................................................20  
Pneumatic Connections–Basic Configuration–Using Bottled Span Gas ....................................27  
Pneumatic Connections–Basic Configuration–Using Gas Dilution Calibrator ............................27  
Pneumatic Connections with Ambient Zero/Ambient Span Valves (OPT 50A) ..........................30  
Pneumatic Connections with Ambient Zero/Ambient Span Valves (Opt 50A) and  
External Zero Air Scrubber..........................................................................................................30  
Pneumatic Connections with Ambient Zero/Pressurized Span Valves (OPT 50B) ....................31  
Pneumatic Connections with Ambient Zero/Pressurized Span Valves (Opt 50B) and  
Figure 3-13:  
Figure 3-14:  
External Zero Air Scrubber..........................................................................................................31  
Example of Pneumatic Set up for Multipoint Calibration.............................................................32  
O2 Sensor Calibration Set Up.....................................................................................................40  
Current Loop Option Installed on the Motherboard.....................................................................52  
Internal Pneumatic Flow – Ambient Zero/Pressurized Span Valves...........................................55  
Internal Pneumatic Flow – Ambient Zero/Ambient Span ............................................................56  
Multi-drop/LVDS PCA Seated on CPU .......................................................................................58  
Oxygen Sensor - Principle of Operation......................................................................................59  
GFC 7000TA – Internal Pneumatics with O2 Sensor Option 65.................................................60  
Front Panel Display.....................................................................................................................63  
Viewing TEST Functions.............................................................................................................66  
Viewing and Clearing GFC 7000TA WARNING Messages........................................................68  
Default DAS Channels Setup......................................................................................................75  
APICOM User Interface for DAS Configuration ..........................................................................88  
Analog Output Connector Pin Out...............................................................................................89  
Rear Panel Connector Pin-Outs for COM1 & COM2 in RS-232 Mode.....................................103  
CPU Connector Pin-Outs for COM1 & COM2 in RS-232 Mode ...............................................104  
Multidrop/LVDS PCA Seated on CPU.......................................................................................114  
RS232-Multidrop PCA Host/Analyzer Interconnect Diagram....................................................115  
Setup for Calibrating Analog Voltage Outputs ..........................................................................130  
Setup for Calibrating Current Outputs.......................................................................................132  
Status Output Connector...........................................................................................................143  
Control Inputs ............................................................................................................................145  
APICOM Remote Control Program Interface............................................................................152  
Pneumatic Connections–Basic Configuration–Using Bottled Span Gas ..................................162  
Pneumatic Connections–Basic Configuration–Using Gas Dilution Calibrator ..........................163  
Pneumatic Connections – Ambient Zero/Pressurized Span Valves ........................................166  
Pneumatic Connections – Ambient Zero/Pressurized Span Valves and External Zero Air  
Scrubber....................................................................................................................................167  
Pneumatic Connections – Ambient Zero/Ambient Span Valves...............................................167  
Pneumatic Connections – Ambient Zero/Ambient Span Valves with External Zero Air  
Figure 3-15:  
Figure 3-16:  
Figure 5-1:  
Figure 5-2:  
Figure 5-3:  
Figure 5-4:  
Figure 5-5:  
Figure 5-6:  
Figure 6-1:  
Figure 6-2:  
Figure 6-3:  
Figure 6-4:  
Figure 6-5:  
Figure 6-6:  
Figure 6-7:  
Figure 6-8:  
Figure 6-9:  
Figure 6-10:  
Figure 6-11:  
Figure 6-12:  
Figure 6-13:  
Figure 6-14:  
Figure 6-15:  
Figure 7-1:  
Figure 7-2:  
Figure 7-3:  
Figure 7-4:  
Figure 7-5:  
Figure 7-6:  
Scrubber....................................................................................................................................168  
Sample Particulate Filter Assembly ..........................................................................................184  
Measurement Fundamentals.....................................................................................................188  
GFC Wheel................................................................................................................................188  
Measurement Fundamentals with GFC Wheel .........................................................................189  
Affect of CO2 in the Sample on CO2 MEAS & CO2 REF.........................................................190  
Effects of Interfering Gas on CO2 MEAS & CO2 REF..............................................................191  
Figure 8-1:  
Figure 9-1:  
Figure 9-2:  
Figure 9-3:  
Figure 9-4:  
Figure 9-5:  
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Model GFC7000TA Carbon Dioxide Analyzer  
Figure 9-6:  
Figure 9-7:  
Figure 9-8:  
Figure 9-9:  
Chopped IR Signal ....................................................................................................................191  
Internal Pneumatic Flow – Basic Configuration ........................................................................194  
Flow Control Assembly & Critical Flow Orifice..........................................................................195  
GFC 7000TA Electronic Block Diagram....................................................................................198  
CPU Board ................................................................................................................................199  
GFC Light Mask ........................................................................................................................201  
Segment Sensor and M/R Sensor Output.................................................................................202  
GFC 7000TA Sync / Demod Block Diagram.............................................................................203  
Sample & Hold Timing...............................................................................................................204  
Location of relay board Status LED’s........................................................................................207  
Power Distribution Block Diagram.............................................................................................211  
Front Panel and Display Interface Block Diagram ....................................................................212  
Basic Software Operation..........................................................................................................213  
Viewing and Clearing Warning Messages ................................................................................219  
Example of Signal I/O Function.................................................................................................224  
CPU Status Indicator.................................................................................................................225  
Sync/Demod Board Status LED Locations ...............................................................................226  
Relay Board Status LEDs..........................................................................................................226  
GFC 7000TA – Basic Internal Gas Flow...................................................................................229  
Internal Pneumatic Flow – Ambient Zero/Pressurized Span Valves.........................................230  
Internal Pneumatic Flow – Ambient Zero/Ambient Span ..........................................................231  
GFC 7000TA – Internal Pneumatics with O2 Sensor Option 65A.............................................232  
Critical Flow Restrictor Assembly Disassembly ........................................................................251  
Opening the GFC Wheel Housing.............................................................................................252  
Removing the GFC Wheel ........................................................................................................253  
Triboelectric Charging ...............................................................................................................255  
Basic anti-ESD Work Station.....................................................................................................258  
Figure 9-10:  
Figure 9-11:  
Figure 9-12:  
Figure 9-13:  
Figure 9-14:  
Figure 9-15:  
Figure 9-16:  
Figure 9-17:  
Figure 9-18:  
Figure 10-1:  
Figure 10-2:  
Figure 10-3:  
Figure 10-4:  
Figure 10-5:  
Figure 10-6:  
Figure 10-7:  
Figure 10-8:  
Figure 10-9:  
Figure 10-10:  
Figure 10-11:  
Figure 10-12:  
Figure 11-1:  
Figure 11-2:  
LIST OF TABLES  
Table 2-1: Model GFC 7000TA Basic Unit Specifications .....................................................................................5  
Table 3-1: Display and Touchscreen Control Description ...................................................................................13  
Table 3-2: Rear Panel Description.......................................................................................................................16  
Table 3-3: Analog Input Pin Assignments............................................................................................................21  
Table 3-4: GFC 7000TA Analog Output Pin Outs................................................................................................22  
Table 3-5: Status Output Pin-outs........................................................................................................................23  
Table 3-6: Control Input Pin-outs.........................................................................................................................24  
Table 3-7: Rear Panel Pneumatic Connections...................................................................................................26  
Table 3-8: Front Panel Display During System Warm-Up ...................................................................................34  
Table 3-9: Possible Warning Messages at Start-Up............................................................................................35  
Table 5-1: Ambient Zero/Pressurized Span Valve Operating States ..................................................................54  
Table 5-2: Ambient Zero/Ambient Span Valve Operating States ........................................................................55  
Table 6-1: Analyzer Operating modes .................................................................................................................64  
Table 6-2: Test Functions Defined.......................................................................................................................65  
Table 6-3: List of Warning Messages ..................................................................................................................67  
Table 6-4: Primary Setup Mode Features and Functions....................................................................................69  
Table 6-5: Secondary Setup Mode Features and Functions ...............................................................................69  
Table 6-6: Front Panel Sample LED Status Indicators for DAS ..........................................................................71  
Table 6-7: DAS Data Channel Properties............................................................................................................72  
Table 6-8: DAS Data Parameter Functions .........................................................................................................73  
Table 6-9: Password Levels.................................................................................................................................97  
Table 6-10: Com Port Communication Modes.....................................................................................................106  
Table 6-11: Ethernet Status Indicators ................................................................................................................108  
Table 6-12: LAN/Internet Configuration Properties..............................................................................................109  
Table 6-13: Internet Configuration Touchscreen Functions.................................................................................113  
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Table 6-14: Variable Names (VARS) Revision B.3..............................................................................................118  
Table 6-15: GFC 7000TA Diagnostic (DIAG) Functions......................................................................................120  
Table 6-16: DIAG - Analog I/O Functions ............................................................................................................123  
Table 6-17: Analog Output Voltage Ranges .......................................................................................................124  
Table 6-18: Analog Output Current Loop Range.................................................................................................125  
Table 6-19: Analog Output Pin Assignments.......................................................................................................125  
Table 6-20: Voltage Tolerances for Analog Output Calibration ...........................................................................129  
Table 6-21: Current Loop Output Calibration with Resistor.................................................................................133  
Table 6-22: Test Parameters Available for Analog Output A4.............................................................................140  
Table 6-23: CO2 Concentration Alarm Default Settings.......................................................................................141  
Table 6-24: Status Output Pin Assignments........................................................................................................144  
Table 6-25: Control Input Pin Assignments .........................................................................................................145  
Table 6-26: Terminal Mode Software Commands...............................................................................................146  
Table 6-27: Command Types ..............................................................................................................................147  
Table 6-28: Serial Interface Documents ..............................................................................................................153  
Table 6-29: RS-232 Communication Parameters for Hessen Protocol...............................................................154  
Table 6-30: Teledyne Instruments Hessen Protocol Response Modes ..............................................................156  
Table 6-31: Default Hessen Status Bit Assignments...........................................................................................158  
Table 7-1: AUTOCAL Modes.............................................................................................................................173  
Table 7-2: AutoCal ATTRIBUTE Setup Parameters..........................................................................................173  
Table 7-3: Calibration Data Quality Evaluation..................................................................................................176  
Table 8-1: GFC 7000TA Maintenance Schedule...............................................................................................181  
Table 8-2: GFC 7000TA Test Function Record.................................................................................................182  
Table 8-3: Predictive uses for Test Functions....................................................................................................183  
Table 9-1: Sync/Demod Status LED Activity......................................................................................................204  
Table 9-2: Relay Board Status LED’s ................................................................................................................206  
Table 10-1: Warning Messages - Indicated Failures ...........................................................................................220  
Table 10-2: Test Functions - Indicated Failures ..................................................................................................222  
Table 10-3: Sync/Demod Board Status Failure Indications.................................................................................225  
Table 10-4: I2C Status LED Failure Indications...................................................................................................226  
Table 10-5: Relay Board Status LED Failure Indications ....................................................................................227  
Table 10-6: DC Power Test Point and Wiring Color Codes.................................................................................241  
Table 10-7: DC Power Supply Acceptable Levels...............................................................................................242  
Table 10-8: Relay Board Control Devices............................................................................................................243  
Table 10-9: Opto Pickup Board Nominal Output Frequencies.............................................................................244  
Table 10-10: Analog Output Test Function - Nominal Values Voltage Outputs ....................................................247  
Table 10-11: Analog Output Test Function - Nominal Values Current Outputs.....................................................247  
Table 10-12: Status Outputs Check.......................................................................................................................248  
Table 11-1: Static Generation Voltages for Typical Activities..............................................................................255  
Table 11-2: Sensitivity of Electronic Devices to Damage by ESD.......................................................................256  
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Introduction  
Model GFC7000TA Carbon Dioxide Analyzer  
1. INTRODUCTION  
The Models GFC 7000TA and GFC 7000TM differ only in specifications; unless clearly differentiated,  
both models in this manual are referred to as the GFC 7000TA for simplification. The GFC 7000TA  
measures carbon dioxide CO2 by comparing infrared energy absorbed by a sample to that absorbed by a  
reference according to the Beer-Lambert law. This is accomplished by using a Gas Filter Wheel which  
alternately allows a high energy infrared light source to pass through a CO2 filled chamber and a chamber  
with no CO2 present.  
The light then travels through the sample cell, which has a folded path. The energy loss through the  
sample cell is compared with the zero reference signal provided by the gas filter to produce an output  
proportional to concentration, with little effect from interfering gases within the sample. A nitrogen purge  
system is provided for the GFC wheel assembly to eliminate the effects of ambient CO2, if necessary.  
This design produces superior zero and span stability and a high signal-to-noise ratio, allowing excellent  
sensitivity. Multi-tasking software gives real time indication of numerous operating parameters and  
provides automatic alarms if diagnostic limits are exceeded  
1.1. Features  
Ranges, GFC 7000TA: 0-2 ppm to 0-2000 ppm, GFC 7000TM: 0-4 ppm to 0-4000 ppm, user  
selectable  
Gas Filter Wheel for CO2 specific measurement  
LCD Graphical User Interface with capacitive touch screen  
Multi-tasking software allows viewing of test variables during operation  
Continuous self checking with alarms  
Bi-directional RS-232 and 10/100Base-T Ethernet (optional USB and RS-485) ports for remote  
operation  
Front panel USB ports for peripheral devices  
Digital status outputs to indicate instrument operating condition  
Adaptive signal filtering to optimize response time  
Temperature & Pressure compensation  
Internal data logging with 1 min to 24 hour averages  
1.2. Using This Manual  
This manual has the following data structures:  
1 TABLE OF CONTENTS:  
Outlines the contents of the manual in the order the information is presented. This is a good overview of  
the topics covered in the manual. There is also a list of tables, a list of figures and a list of appendices.  
2 SPECIFICATIONS  
This section contains a list of the analyzer’s performance specifications.  
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Introduction  
Model GFC7000TA Carbon Dioxide Analyzer  
3 GETTING STARTED:  
Instructions for setting up, installing, and performing a functional check and initial calibration.  
4 FAQ  
Answers to the most frequently asked questions about operating the analyzer.  
5 OPTIONAL HARDWARE & SOFTWARE  
A description of optional equipment to add functionality to your analyzer.  
6 OPERATION INSTRUCTIONS  
This section includes step-by-step instructions for operating the analyzer and using its various features  
and functions.  
7 CALIBRATION PROCEDURES  
General information and step by step instructions for calibrating your analyzer.  
8 EPA PROTOCOL CALIBRATION  
Because CO2 is not declared a criteria air pollutant by the US EPA, EPA equivalency is not required for  
this type of analyzer. Therefore no special calibration methods are needed to satisfy EPA requirements.  
9 INSTRUMENT MAINTENANCE  
Description of certain preventative maintenance procedures that should be regularly performed on you  
instrument to keep it in good operating condition. This section also includes information on using the  
DAS to record diagnostic functions useful in predicting possible component failures before they happen.  
10 THEORY OF OPERATION  
An in-depth look at the various principals by which your analyzer operates as well as a description of how  
the various electronic, mechanical and pneumatic components of the instrument work and interact with  
each other. A close reading of this section is invaluable for understanding the instrument’s operation.  
11 TROUBLESHOOTING  
This section includes pointers and instructions for diagnosing problems with the instrument, such as  
excessive noise or drift, as well as instructions on performing repairs of the instrument’s major  
subsystems.  
12. A PRIMER ON ELECTRO-STATIC DISCHARGE  
Very important information on how static electricity occurs, why it is so dangerous to electronic  
components and assemblies as well as how to prevent that damage from occurring.  
APPENDICES:  
These include: software menu trees, warning messages, definitions of DAS & serial I/O variables, spare  
parts list, repair questionnaire, interconnect listing and drawings, and electronic schematics.  
NOTE  
Throughout this manual, words printed in capital, bold letters, such as SETUP  
or ENTR represent messages as they appear on the analyzer’s front panel  
display. Also, flowcharts in this manual contain typical representations of the  
analyzer’s display during the various operations being described.  
These  
representations are not intended to be exact and may differ slightly from the  
actual display of your instrument.  
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Introduction  
Model GFC7000TA Carbon Dioxide Analyzer  
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Specifications  
Model GFC7000TA Carbon Dioxide Analyzer  
2. SPECIFICATIONS AND APPROVALS  
2.1. Specifications  
Table 2-1: Model GFC 7000TA Basic Unit Specifications  
GFC 7000TA Parameter  
Ranges  
GFC 7000TA Specification  
Min: 0-2 ppm Full scale  
(Physical Analog Output)  
Max: 0-2,000 ppm Full scale  
Selectable, dual ranges and auto ranging supported  
ppb, ppm, µg/m3, mg/m3, % (user selectable)  
< 0.1 ppm (RMS)  
Measurement Units  
Zero Noise  
Span Noise  
< 1% of reading (RMS)  
Lower Detectable Limit  
Zero Drift (24 hours)  
Span Drift (24 hours)  
Lag Time  
< 0.2 ppm1  
<0.25 ppm1  
<0.5% of reading 1  
10 seconds  
Rise/Fall Time  
Linearity  
<60 seconds to 95%  
1% of full scale  
Precision  
0.5% of reading  
Sample Flow Rate  
800cm3/min. ±10%  
O2 Sensor option adds 110 cm³/min, ±20%, to total flow through when installed.  
< 0.1% of Full Scale per oC  
< 0.05% of Full Scale per V  
100V-120V, 220V – 240 V, 50/60 Hz  
10V, 5V, 1V, 0.1V (selectable)  
1 part in 4096 of selected full-scale voltage  
Temperature Coefficient  
Voltage Coefficient  
AC Power Rating  
Analog Output Ranges  
Analog Output Resolution  
Recorder Offset  
±10%  
1 Ethernet: 10/100Base-T  
Standard I/O  
Optional I/O  
2 RS-232 (300 – 115,200 baud)  
2 USB device ports  
8 opto-isolated digital status outputs  
6 opto-isolated digital control inputs (3 defined, 3 spare)  
4 analog outputs  
1 USB com port  
1 RS485  
8 analog inputs (0-10V, 12-bit)  
4 digital alarm outputs  
Multidrop RS232  
3 4-20mA current outputs  
Environmental  
Installation category (over-voltage category) II; Pollution degree 2  
5-40oC  
Temperature Range  
Humidity Range  
0 - 95% RH, non-condensing  
Dimensions H x W x D  
7" x 17" x 23.5" (178 mm x 432 mm x 597 mm)  
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Specifications  
Model GFC7000TA Carbon Dioxide Analyzer  
GFC 7000TA Parameter  
Weight  
GFC 7000TA Specification  
40 lbs. (18.1 kg)  
Certifications  
CE: EN61010-1:90 + A1:92 + A2:95, EN61326 - Class A  
1 At constant temperature and voltage.  
Table 2-2: Model GFC 7000TM Basic Unit Specifications  
GFC 7000TM Parameter  
GFC 7000TM Specification  
Min: 0-4 ppm Full scale  
Max: 0-4000 ppm Full scale  
Selectable, dual ranges and auto ranging supported  
ppb, ppm, µg/m3, mg/m3, (selectable)  
< 0.2 ppm (RMS)  
Ranges  
(Physical Analog Output)  
Measurement Units  
Zero Noise  
Span Noise  
< 1% of reading (RMS)  
< 0.4 ppm1  
<0.5 ppm1  
Lower Detectable Limit  
Zero Drift (24 hours)  
Span Drift (24 hours)  
Lag Time  
<0.5% of reading1  
10 seconds  
Rise/Fall Time  
Linearity  
<60 seconds to 95%  
1% of full scale  
Precision  
0.5% of reading  
Sample Flow Rate  
800cm3/min. ±10%  
O2 Sensor option adds 110 cm³/min, ±20%, to total flow though when installed  
Temperature Coefficient  
Voltage Coefficient  
< 0.1% of Full Scale per oC or 0.1 ppm per oC, whichever is greater  
< 0.05% of Full Scale per V  
AC Power Requirements  
Analog Output Ranges  
Recorder Offset  
100V – 120V, 220V – 240V, 50/60 Hz  
10V, 5V, 1V, 0.1V  
±10%  
Analog Output Resolution  
Standard I/O  
1 part in 4096 of selected full-scale voltage  
1 Ethernet: 10/100Base-T  
2 RS232 (300-115,200 baud)  
2 USB device ports  
8 Status opto-isolated digital status outputs  
6 Opto-isolated digital control inputs (3 defined, 3 spare)  
4 Analog outputs  
Optional I/O  
1 USB com port  
1 RS485  
8 Analog inputs (0-10V, 12-bit)  
4 Digital alarm outputs  
Multidrop RS232  
3 4-20mA current outputs  
Operating Temperature Range  
Humidity Range  
5-40oC  
0 - 95% RH, non-condensing  
Dimensions H x W x D  
Weight  
7" x 17" x 23.5" (178 mm x 432 mm x 597 mm)  
40 lbs. (18.1 kg)  
Environmental  
Installation category (over-voltage category) II; Pollution degree 2  
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Specifications  
Model GFC7000TA Carbon Dioxide Analyzer  
GFC 7000TM Parameter  
Certifications  
GFC 7000TM Specification  
CE: EN61010-1:90 + A1:92 + A2:95, EN61326 - Class A  
1 At constant temperature and voltage.  
2.2. CE Mark Compliance  
Emissions Compliance  
The Teledyne Instruments Model GFC 7000TA Gas Filter Correlation CO2 Analyzer was tested and found  
to be fully compliant with:  
EN61326 (1997 w/A1: 98) Class A, FCC Part 15 Subpart B section 15.107 Class A, ICES-003 Class A  
(ANSI C63.4 1992) & AS/NZS 3548 (w/A1 & A2; 97) Class A.  
Safety Compliance  
The Teledyne Instruments Model GFC 7000TA Gas Filter Correlation CO2 Analyzer was tested and found  
to be fully compliant with:  
IEC 61010-1:90 + A1:92 + A2:95  
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Getting Started  
Model GFC7000TA Carbon Dioxide Analyzer  
3. GETTING STARTED  
3.1. Unpacking and Initial Set Up  
CAUTION  
To avoid personal injury, always use two persons to lift and carry the Model GFC  
7000TA.  
WARNING  
Never disconnect PCAs, wiring harnesses or electronic subassemblies while the  
instrument is under power.  
CAUTION – Avoid Warranty Invalidation  
Printed circuit assemblies (PCAs) are sensitive to electro-static discharges too  
small to be felt by the human nervous system. Damage resulting from failure to  
use ESD protection when working with electronic assemblies will void the  
instrument warranty.  
See A Primer on Electro-Static Discharge in this manual for more information on  
preventing ESD damage.  
NOTE  
It is recommended that you store shipping containers/materials for future use if/when the instrument should  
be returned to the factory for repair and/or calibration service. See Warranty section in this manual and  
shipping procedures on our Website at:  
http://www.teledyne-api.com under Customer Support > Return Authorization.  
1. Verify that there is no apparent external shipping damage. If damage has occurred, please  
advise the shipper first, then Teledyne Instruments.  
2. Included with your analyzer is a printed record of the final performance characterization  
performed on your instrument at the factory. This record, titled Final Test and Validation Data  
Sheet (P/N 04596) is an important quality assurance and calibration record for this instrument. It  
should be placed in the quality records file for this instrument.  
3. Carefully remove the top cover of the analyzer and check for internal shipping damage.  
Remove the set-screw located in the top, center of the Front panel.  
Remove the 2 screws fastening the top cover to the unit (one per side towards the rear).  
Slide the cover backwards until it clears the analyzer’s front bezel.  
Lift the cover straight up.  
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Getting Started  
Model GFC7000TA Carbon Dioxide Analyzer  
4. Inspect the interior of the instrument to make sure all circuit boards and other components are in  
good shape and properly seated.  
5. Check the connectors of the various internal wiring harnesses and pneumatic hoses to make sure  
they are firmly and properly seated.  
6. Verify that all of the optional hardware ordered with the unit has been installed. These are listed  
on the paperwork accompanying the analyzer.  
VENTILATION CLEARANCE: Whether the analyzer is set up on a bench or installed into an instrument  
rack, be sure to leave sufficient ventilation clearance.  
AREA  
Back of the instrument  
MINIMUM REQUIRED CLEARANCE  
4 in.  
1 in.  
1 in.  
Sides of the instrument  
Above and below the instrument  
Various rack mount kits are available for this analyzer. See Section 5.1 of this manual for more  
information.  
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Getting Started  
Model GFC7000TA Carbon Dioxide Analyzer  
3.2. Front Panel  
Figure 3-1 shows the analyzer’s front panel layout, followed by a close-up of the display screen in Figure  
3-2, which is described in Table 3-1. The two USB ports on the front panel are provided for the  
connection of peripheral devices:  
plug-in mouse (not included) to be used as an alternative to the touchscreen interface  
thumb drive (not included) to download updates to instruction software (contact TAI Customer  
Service for information).  
Figure 3-1:  
Front Panel Layout  
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Getting Started  
Model GFC7000TA Carbon Dioxide Analyzer  
Figure 3-2:  
Display Screen and Touch Control  
CAUTION – Avoid Damaging Touchscreen  
Do not use hard-surfaced instruments such as pens to operate the touchscreen.  
The front panel liquid crystal display includes touch control. Upon analyzer start-up, the display shows a  
splash screen and other initialization indicators before the main display appears, similar to Figure 3-2  
above (may or may not display a Fault alarm). The LEDs on the display screen indicate the Sample,  
Calibration and Fault states; also on the screen is the gas concentration field (Conc), which displays real-  
time readouts for the primary gas and for the secondary gas if installed. The display screen also shows  
which mode the analyzer is currently in (Mode field), as well as messages and data (Param field). Along  
the bottom of the screen is a row of touch control buttons; only those that are currently applicable will  
have a label. Table 3-1 provides detailed information for each component of the screen.  
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Getting Started  
Model GFC7000TA Carbon Dioxide Analyzer  
Table 3-1: Display and Touchscreen Control Description  
Description/Function  
Field  
Status  
LEDs indicating the states of Sample, Calibration and Fault, as follows:  
Name  
Color  
State  
Off  
Definition  
Unit is not operating in sample mode, DAS is disabled.  
On  
Sample Mode active; Front Panel Display being updated; DAS data  
being stored.  
SAMPLE Green  
Unit is operating in sample mode, front panel display being updated,  
DAS hold-off mode is ON, DAS disabled  
Blinking  
Off  
Auto Cal disabled  
Auto Cal enabled  
Unit is in calibration mode  
No warnings exist  
Warnings exist  
CAL  
Yellow  
Red  
On  
Blinking  
Off  
FAULT  
Blinking  
Displays the actual concentration of the sample gas currently being measured by the analyzer in the  
currently selected units of measure  
Conc  
Mode  
Displays the name of the analyzer’s current operating mode  
Displays a variety of informational messages such as warning messages, operational data, test function  
values and response messages during interactive tasks.  
Param  
Control Buttons  
Displays dynamic, context sensitive labels on each button, which is blank when inactive until applicable.  
Figure 3-3 shows how the front panel display is mapped to the menu charts illustrated in this manual. The  
Mode, Param (parameters), and Conc (gas concentration) fields in the display screen are represented  
across the top row of each menu chart. The eight touchscreen control buttons along the bottom of the  
display screen are represented in the bottom row of each menu chart.  
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Getting Started  
Model GFC7000TA Carbon Dioxide Analyzer  
Figure 3-3:  
Display/Touch Control Screen Mapped to Menu Charts  
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Model GFC7000TA Carbon Dioxide Analyzer  
3.3. Rear Panel  
Figure 3-4:  
Rear Panel Layout  
Table 3-2 provides a description of each component on the rear panel  
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Model GFC7000TA Carbon Dioxide Analyzer  
Table 3-2: Rear Panel Description  
Component  
cooling fan  
Function  
Pulls ambient air into chassis through side vents and exhausts through rear  
Connector for three-prong cord to apply AC power to the analyzer  
AC power  
connector  
CAUTION! The cord’s power specifications (specs) MUST comply with the power  
specs on the analyzer’s rear panel Model number label  
Identifies the analyzer model number and provides power specs  
Model/specs label  
PURGE IN  
Connect a gas line from the source of sample gas here  
SAMPLE  
EXHAUST  
Calibration gases are also inlet here on units without zero/span valve options installed  
Connect an exhaust gas line of not more than 10 meters long here that leads outside  
the shelter or immediate area surrounding the instrument  
Span gas vent outlet for units with zero/span valve options installed  
Connect an exhaust gas line of not more than 10 meters long here  
VENT SPAN  
On units with zero/span valve options installed, connect a gas line to the source of  
calibrated span gas here  
PRESSURE SPAN  
IZS  
Internal Zero Air: On units with zero/span valve options installed but no internal zero  
air scrubber attach a gas line to the source of zero air here  
LEDs indicate receive (RX) and transmit (TX) activity on the when blinking  
Serial communications port for RS-232 or RS-485  
RX TX  
COM 2  
RS-232  
Serial communications port for RS-232 only  
Switch to select either data terminal equipment or data communication equipment  
during RS-232 communication  
DCE DTE  
For outputs to devices such as Programmable Logic Controllers (PLCs)  
For voltage or current loop outputs to a strip chart recorder and/or a data logger  
For remotely activating the zero and span calibration modes  
STATUS  
ANALOG OUT  
CONTROL IN  
ALARM  
Option for concentration alarms and system warnings  
Connector for network or Internet remote communication, using Ethernet cable  
ETHERNET  
Option for external voltage signals from other instrumentation and for logging these  
signals  
ANALOG IN  
Com port optional connector for direct connection to laptop computer, using USB cable  
Includes voltage and frequency specifications  
USB  
Information Label  
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3.4. Internal Layout  
Figure 3-3 shows a top-down view of the analyzer. The shown configuration includes the Ethernet board,  
IZS option, zero-air scrubber and an additional sample dryer. See Section 5 for optional equipment.  
Figure 3-5:  
Internal Chassis Layout  
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Sample Gas Outlet  
fitting  
Sample Gas Flow  
Sensor  
Sample Chamber  
Sync/Demod PCA  
Housing  
Pressure Sensor(s)  
Bench  
Temperature  
Thermistor  
Shock Absorbing  
Mounting Bracket  
Opto-Pickup  
PCA  
Purge Gas  
Pressure Regulator  
IR Source  
GFC Wheel  
Heat Sync  
GFC Wheel Motor  
GFC Temperature  
Sensor  
Purge Gas  
Inlet  
GFC Heater  
Figure 3-6:  
Optical Bench Layout  
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Figure 3-7:  
GFC 7000TA Internal Gas Flow  
3.5. Electrical Connections  
WARNING  
Never disconnect PCAs, wiring harnesses or electronic subassemblies while the  
instrument is under power.  
NOTE  
To maintain compliance with EMC standards, it is required that the cable length be no greater than 3  
meters for all I/O connections, which include Analog In, Analog Out, Status Out, Control In, Ethernet/LAN,  
USB, RS-232, and RS-485.  
Refer to Figure 3-4 for the locations of the rear panel connections.  
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3.5.1. Power Connection  
WARNING  
Power connection must have functioning ground connection.  
Do not defeat the ground wire on power plug.  
Turn off analyzer power before disconnecting or  
connecting electrical subassemblies.  
Do not operate with cover off.  
CAUTION  
Check the voltage and frequency specifications on the rear panel Model Label for  
compatibility with the local power before plugging the analyzer into line power.  
Do not plug in the power cord if the voltage or frequency is incorrect.  
The GFC 7000TA analyzer can be configured for both 100-130 V and 210-240 V at either 50 or 60 Hz.  
To avoid damage to your analyzer, make sure that the AC power voltage matches the voltage indicated  
on the rear panel serial number label and that the frequency is between 47 and 63 Hz.  
Attach the power cord to the analyzer and plug it into a power outlet capable of carrying at least 10 A  
current at your AC voltage and that it is equipped with a functioning earth ground.  
3.5.2. Connecting Analog Inputs (Option 64)  
The Analog In connector is used for connecting external voltage signals from other instrumentation (such  
as meteorological instruments) and for logging these signals in the analyzer’s internal DAS. The input  
voltage range for each analog input is 0-10 VDC.  
Figure 3-8:  
Analog In Connector  
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Pin assignments for the Analog In connector are presented in Table 3-3.  
Table 3-3: Analog Input Pin Assignments  
PIN  
DESCRIPTION  
DAS  
PARAMETER1  
1
2
3
4
5
6
7
8
Analog input # 1  
AIN 1  
AIN 2  
AIN 3  
AIN 4  
AIN 5  
AIN 6  
AIN 7  
AIN 8  
N/A  
Analog input # 2  
Analog input # 3  
Analog input # 4  
Analog input # 5  
Analog input # 6  
Analog input # 7  
Analog input # 8  
Analog input Ground  
GND  
1 See Section 6.7 for details on setting up the DAS.  
3.5.3. Connecting Analog Outputs  
The GFC 7000TA is equipped with several analog output channels accessible through a connector on the  
back panel of the instrument. The standard configuration for these outputs is mVDC. An optional current  
loop output is available for each.  
When the instrument is in its default configuration, channels A1 and A2 output a signal that is proportional  
to the CO2 concentration of the sample gas. Either can be used for connecting the analog output signal  
to a chart recorder or for interfacing with a data logger.  
Output A3 is only used if the optional O2 sensor is installed.  
Channel A4 is special. It can be set by the user (see Section 6.13.9) to output any one of the parameters  
accessible through the <TST TST> keys of the units sample display.  
To access these signals attach a strip chart recorder and/or data-logger to the appropriate analog output  
connections on the rear panel of the analyzer.  
ANALOG  
A1  
A2  
A3  
A4  
1
2
3
4
5
6
7
8
Pin-outs for the analog output connector at the rear panel of the instrument are:  
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Table 3-4: GFC 7000TA Analog Output Pin Outs  
PIN  
1
ANALOG OUTPUT  
VDC SIGNAL  
V Out  
MADC SIGNAL  
I Out +  
A1  
2
Ground  
V Out  
I Out -  
3
I Out +  
A2  
4
Ground  
V Out  
I Out -  
5
I Out +  
A3  
(Only used if O2 sensor  
is installed)  
6
Ground  
I Out -  
7
8
V Out  
Not used  
Not used  
A4  
Ground  
The default analog output voltage setting of the GFC 7000TA CO2 Analyzer is 0 – 5 VDC with  
a range of 0 – 500 ppm.  
TO change these settings, see Sections 6.13.4 and 6.8 respectively.  
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3.5.4. Connecting the Status Outputs  
If you wish utilize the analyzer’s status outputs to interface with a device that accepts logic-level digital  
inputs, such as programmable logic controllers (PLC’s) they are accessed via a 12-pin connector on the  
analyzer’s rear panel labeled STATUS.  
STATUS  
1
2
3
4
5
6
7
8
D
+
NOTE  
Most PLC’s have internal provisions for limiting the current the input will draw.  
When connecting to a unit that does not have this feature, external resistors must  
be used to limit the current through the individual transistor outputs to ≤50mA  
(120 Ω for 5V supply).  
The pin assignments for the status outputs can be found in the table below:  
Table 3-5: Status Output Pin-outs  
STATUS  
OUTPUT #  
CONDITION  
DEFINITION  
1
2
SYSTEM OK  
On if no faults are present.  
On if CO2 concentration measurement is valid.  
CONC VALID  
If the CO2 concentration measurement is invalid, this bit is OFF.  
On if unit is in high range of DUAL or AUTO range modes.  
On whenever the instruments ZERO point is being calibrated.  
On whenever the instruments SPAN point is being calibrated.  
On whenever the instrument is in DIAGNOSTIC mode.  
3
4
5
6
HIGH RANGE  
ZERO CAL  
SPAN CAL  
DIAG MODE  
On whenever the measured CO2 concentration is above the set point for  
ALM1  
7
8
ALARM1  
ALARM2  
On whenever the measured CO2 concentration is above the set point for  
ALM2  
D
+
EMITTER BUS  
DC POWER  
The emitters of the transistors on pins 1-8 are bused together.  
+ 5 VDC  
Digital Ground  
The ground level from the analyzer’s internal DC power supplies.  
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3.5.5. Connecting the Control Inputs  
If you wish to use the analyzer to remotely activate the zero and span calibration modes, several digital  
control inputs are provided through a 10-pin connector labeled CONTROL IN on the analyzer’s rear  
panel.  
There are two methods for energizing the control inputs. The internal +5V available from the pin labeled  
“+” is the most convenient method. However, if full isolation is required, an external 5 VDC power supply  
should be used.  
CONTROL IN  
CONTROL IN  
A
B
C
D
E
F
U
+
A
B
C
D
E
F
U
+
Z
E
R
O
S
P
A
N
Z
E
R
O
S
P
A
N
5 VDC Power  
Supply  
+
-
External Power Connections  
Local Power Connections  
The pin assignments for the digital control inputs can be found in the table below:  
Table 3-6: Control Input Pin-outs  
STATUS  
INPUT #  
ON CONDITION  
DEFINITION  
REMOTE ZERO  
CAL  
The Analyzer is placed in Zero Calibration mode. The mode field of  
the display will read ZERO CAL R.  
A
B
REMOTE  
SPAN CAL  
The Analyzer is placed in Span Calibration mode. The mode field of  
the display will read SPAN CAL R.  
SPARE  
SPARE  
C
D
E
F
SPARE  
SPARE  
Digital Ground  
May be connected to the ground of the data logger/recorder.  
Input pin for +5 VDC required to activate pins A – F. This can be from  
an external source or from the “+” pin of the instruments STATUS  
connector.  
Pull-up supply for  
inputs  
U
Internal +5V  
Supply  
Internal source of +5V which can be used to actuate control inputs  
when connected to the U pin.  
+
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3.5.6. Connecting the Communications Interfaces  
For RS-232 or RS-485 communications through the analyzer’s serial interface com ports, refer to Section  
6.11 of this manual for instructions on their configuration and usage.  
3.5.6.1. Connecting to a LAN or the Internet  
For network or Internet communication with the analyzer, connect an Ethernet cable from the analyzer’s  
rear panel Ethernet interface connector to an Ethernet access port.  
NOTE:  
The GFC 7000TA firmware supports dynamic IP addressing or DHCP.  
If your network also supports DHCP, the analyzer will automatically configure its  
LAN connection appropriately,  
If your network does not support DHCP, see Section 6.11.6.3 for instructions on  
manually configuring the LAN connection.  
3.5.6.2. Connecting to a Personal Computer (PC)  
If the analyzer is configured with the USB com option, connect a USB cable between the USB ports of the  
analyzer’s rear panel and a desktop or laptop PC for direct communication between the two. Their baud  
rates must match (see Section 6.11.8).  
3.5.6.3. Connecting to a Multidrop Network  
If your unit has a Teledyne Instruments RS-232 multidrop card (Option 62), see Section 6.11.7 for  
instructions on setting it up.  
3.6. Pneumatic Connections  
CAUTION!  
Do not operate this instrument until you’ve removed dust plugs from SAMPLE and EXHAUST  
ports on the rear panel!  
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3.6.1. Basic Pneumatic Connections  
NOTE  
In order to prevent dust from getting into the gas flow channels of your analyzer,  
it was shipped with small plugs inserted into each of the pneumatic fittings on the  
back panel. Remove these plugs before operating the analyzer. It is recommended  
that they be stored for future use (moving, storing or shipping the analyzer).  
Figure 3-4 illustrates the basic configuration for gas supply and exhaust lines to the Model GFC 7000TA  
Analyzer. Figure 3-5 illustrates the internal gas flow of the instrument in its basic configuration.  
Please refer to Figure 3-2 for pneumatic connections at the rear panel and Table 3-2 for description.  
NOTE  
Sample and calibration gases should only come into contact with PTFE (Teflon),  
FEP, glass, stainless steel or brass.  
Table 3-7: Rear Panel Pneumatic Connections  
REAR PANEL LABEL  
SAMPLE  
FUNCTION  
Connect a gas line from the source of sample gas here.  
Calibration gasses are also inlet here on units without zero/span valve or IZS  
options installed.  
EXHAUST  
Connect an exhaust gas line of not more than 10 meters long here.  
On units with zero/span valve options installed, connect a gas line to the source  
of calibrated span gas here.  
PRESSURE SPAN  
Span gas vent outlet for units with zero/span valve options installed.  
Connect an exhaust gas line of not more than 10 meters long here.  
VENT SPAN  
IZS  
Internal zero air scrubber.  
On units with zero/span valve options installed but no internal zero air  
scrubber, attach a gas line to the source of zero air here.  
This inlet supplies purge air to the GFC wheel housing (see Section 10.2.3)  
Connect a source of dried air that has been scrubbed of CO2.  
PURGE IN  
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Figure 3-9:  
Pneumatic Connections–Basic Configuration–Using Bottled Span Gas  
Figure 3-10:  
Pneumatic Connections–Basic Configuration–Using Gas Dilution Calibrator  
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7. Attach a sample inlet line to the sample inlet port. The SAMPLE input line should not be more  
than 2 meters long.  
NOTE  
Ideally, the pressure of the sample gas should be at ambient pressure (0 psig).  
Maximum pressure of sample gas should not exceed 1.5 in-Hg over ambient.  
In applications where the sample gas is received from a pressurized manifold, a vent  
must be placed as shown to equalize the sample gas with ambient atmospheric  
pressure before it enters the analyzer.  
This vent line must be:  
At least 0.2m long  
No more than 2m long and vented outside the shelter or immediate area  
surrounding the instrument.  
8. Attach sources of zero air and span gas (see Figures 3-3 through 3-8 inclusive).  
Span Gas is a gas specifically mixed to match the chemical composition of the type of gas  
being measured at near full scale of the desired measurement range.  
In the case of CO2 measurements made with the Teledyne Instruments Model GFC 7000TA  
Analyzer it is recommended that you use a gas calibrated to have a CO2 content equaling  
80% of the range of compositions being measured.  
EXAMPLE: If the application is to measure between 0 ppm and 500 ppm, an appropriate Span  
Gas would be 400 ppm. If the application is to measure between 0 ppm and 100 ppm, an  
appropriate Span Gas would be 80 ppm.  
Span Gas can be purchased in pressurized canisters or created using Dynamic Dilution  
Calibrator such as the Teledyne Instruments Model T700 and a source of dried air scrubbed  
of CO2 such as a bottle of N2.  
Zero Air is similar in chemical composition to the Earth’s atmosphere but scrubbed of all  
components that might affect the analyzer’s readings.  
In the case of CO2 measurements this means less than 0.1 ppm of CO2 and Water Vapor  
(when dew point <-15˚C). Zero Air can be purchased in pressurized canisters.  
9. Attach an exhaust line to the exhaust outlet port.  
The exhaust from the pump and vent lines should be vented to atmospheric pressure using  
maximum of 10 meters of ¼” PTEF tubing.  
CAUTION  
Venting should be outside the shelter or immediate area surrounding the instrument.  
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10. Attach a source of dried air scrubbed of CO2 to the purge inlet port.  
NOTE  
The minimum gas pressure of the source of purge air should be 7.5 psig.  
If the source of the purge air is shared by a Teledyne Instruments T700 (as shown  
in figure 3-7) the minimum gas pressure should be 25 psig and should not exceed  
35 psig.  
11. Once the appropriate pneumatic connections have been made, check all pneumatic fittings for  
leaks using a procedure similar to that defined in Section 9.3.3.  
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3.6.2. Connections with Internal Valve Options Installed  
Figure 3-11 and Figure 3-12 show the pneumatic connections for the ambient zero and ambient span  
valve option (Option 50A).  
Figure 3-11:  
Pneumatic Connections with Ambient Zero/Ambient Span Valves (OPT 50A)  
Figure 3-12:  
Pneumatic Connections with Ambient Zero/Ambient Span Valves (Opt 50A) and  
External Zero Air Scrubber  
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Figure 3-13 and Figure 3-14 show the pneumatic connections for the ambient zero and ambient span  
valve option (Option 50B).  
Figure 3-13:  
Pneumatic Connections with Ambient Zero/Pressurized Span Valves (OPT 50B)  
Figure 3-14:  
Pneumatic Connections with Ambient Zero/Pressurized Span Valves (Opt 50B) and  
External Zero Air Scrubber  
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3.6.3. Pneumatic Connections in Multipoint Calibration Applications  
Some applications may require multipoint calibration checks where span gas of several different  
concentrations is needed. We recommend using high-concentration, certified, calibration gas supplied to  
the analyzer through a Gas Dilution Calibrator such as a Teledyne Instruments Model T700. This type of  
calibrator precisely mixes Span Gas and Zero Air to produce any concentration level between 0 ppm and  
the concentration of the calibrated gas.  
Figure 3-12 depicts the pneumatic set up in this sort of application of a Model GFC 7000TA CO2 Analyzer  
with ambient zero/ambient span valve option 50A installed (a common configuration for this type of  
application).  
Figure 3-15:  
Example of Pneumatic Set up for Multipoint Calibration  
3.6.4. Setting the Internal Purge Air Pressure  
In order to maintain proper purge air flow though the GFC wheel housing, a manually adjustable pressure  
regulator is provided (see Figure 3-5). This regulator includes two output ports. One is used to supply  
purge air to the GFC wheel. The other may be used to attach a pressure gauge.  
To adjust the internal purge air pressure of the GFC 7000TA:  
1. Turn off the instrument.  
2. Remove the source of zero air attached to the purge line inlet port at the back of the analyzer.  
3. Remove the analyzer’s top cover.  
4. Remove the cap from the second, unused, output port on the pressure regulator.  
5. Attach a pressure gauge capable of measuring in the 5-10 psig range with 0.5 psig resolution to  
the port.  
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6. Turn the instrument on.  
7. Make sure the zero air supply to the analyzer’s purge line inlet is supplying gas at a stable  
pressure above 7.5 psig.  
8. Adjust the GFC 7000TA’s pressure regulator until the attached gauge reads 7.5 psig.  
9. Turn off the instrument.  
10. Remove the source of zero air attached to the purge line inlet port at the back of the analyzer.  
11. Remove the pressure gauge and reattach the end cap removed in step 4 above.  
12. Replace the analyzer’s top cover.  
3.7. Initial Operation  
If you are unfamiliar with the GFC 7000TA theory of operation, we recommend that you read  
Section 10. For information on navigating the analyzer’s software menus, see the menu trees described  
in Appendix A.  
NOTE  
The analyzer’s cover must be installed to ensure that the temperatures of the GFC  
wheel and absorption cell assemblies are properly controlled.  
3.7.1. Startup  
After electrical and pneumatic connections are made, and initial functional check is required. Turn on the  
instrument. The pump, exhaust fan and PMT cooler fan should start immediately. The display will briefly  
show a logo splash screen at the start of initialization.  
The analyzer should automatically switch to Sample Mode after completing the boot-up sequence and  
start monitoring CO2 gas. However, there is an approximately one hour warm-up period before reliable  
gas measurements can be taken. During the warm-up period, the front panel display may show  
messages in the Parameters field.  
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3.7.2. Warm Up  
During the warm-up period various portions of the instrument’s front panel may behave as indicated in  
Table 3-8.  
Table 3-8: Front Panel Display During System Warm-Up  
NAME  
COLOR  
BEHAVIOR  
SIGNIFICANCE  
Displays current,  
compensated CO2  
Concentration  
This is normal operation, but deemed inaccurate during the  
warm-up period.  
Conc field  
N/A  
Displays current  
mode, e.g.,  
SAMPLE”  
Instrument is in Sample mode but is still in the process of  
warming up. (DAS holdoff period is active)  
Mode field  
N/A  
N/A  
Displays menu items Refer to Table 3-9 for a list and descriptions of warning  
and messages.  
Param field  
messages.  
STATUS LEDs  
Unit is operating in sample mode; front panel display is  
being updated.  
Sample  
Green  
On  
Flashes On/Off when adaptive filter is active  
The instrument’s calibration is not enabled.  
Cal  
Yellow  
Red  
Off  
The analyzer is warming up and hence out of specification  
for a fault-free reading. Various warning messages appear  
in the Param field.  
Fault  
Blinking  
3.7.3. Warning Messages  
Because internal temperatures and other conditions may be outside be specified limits during the  
analyzer’s warm-up period, the software will suppress most warning conditions for 30 minutes after power  
up. If warning messages persist after the 30 minutes warm up period is over, investigate their cause  
using the troubleshooting guidelines in Section 11 of this manual.  
To view and clear warning messages, press:  
SAMPLE  
HVPS WARNING  
CAL MSG  
CO2 = 0.00  
TEST deactivates warning  
TEST  
CLR SETUP  
messages  
MSG activates warning  
SAMPLE  
RANGE=500.000 PPM  
MSG  
CO2 = 0.00  
messages.  
<TST TST> keys replaced with  
< TST TST > CAL  
CLR SETUP  
TEST key  
SAMPLE  
HVPS WARNING  
CO2 = 0.00  
Press CLR to clear the current  
message.  
TEST  
CAL  
MSG  
CLR SETUP  
NOTE:  
If more than one warning is active, the  
next message will take its place  
If the warning message persists  
after several attempts to clear it,  
the message may indicate a  
real problem and not an artifact  
of the warm-up period  
Once the last warning has been  
cleared, the analyzer returns to  
SAMPLE mode  
Make sure warning messages are  
not due to real problems.  
Table 3-6 lists brief descriptions of the warning messages that may occur during start up.  
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Table 3-9: Possible Warning Messages at Start-Up  
MESSAGE  
MEANING  
The instrument’s A/D circuitry or one of its analog outputs is not calibrated.  
The optical bench Temperature is outside the specified limits.  
Remote span calibration failed while the dynamic span feature was set to turned on.  
Remote zero calibration failed while the dynamic zero feature was set to turned on.  
Configuration was reset to factory defaults or was erased.  
Concentration alarm 1 is enabled and the measured CO2 level is ≥ the set point.  
Concentration alarm 2 is enabled and the measured CO2 level is ≥ the set point.  
Configuration storage was reset to factory configuration or erased.  
DAS data storage was erased.  
ANALOG CAL WARNING  
BENCH TEMP WARNING  
BOX TEMP WARNING  
CANNOT DYN SPAN  
CANNOT DYN ZERO  
CONC ALRM1 WARNING  
CONC ALRM2 WARNING  
CONFIG INITIALIZED  
DATA INITIALIZED  
O2 sensor cell temperature outside of warning limits.  
O2 CELL TEMP WARN  
PHOTO TEMP WARNING  
REAR BOARD NOT DET  
RELAY BOARD WARN  
SAMPLE FLOW WARN  
SAMPLE PRESS WARN  
SAMPLE TEMP WARN  
SOURCE WARNING  
The temperature of the IR photometer is outside the specified limits.  
The CPU is unable to communicate with the motherboard.  
The firmware is unable to communicate with the relay board.  
The flow rate of the sample gas is outside the specified limits.  
Sample gas pressure outside of operational parameters.  
The temperature of the sample gas is outside the specified limits.  
The IR source may be faulty.  
The computer was rebooted.  
SYSTEM RESET  
The Gas Filter Correlation wheel temperature is outside the specified limits.  
WHEEL TEMP WARNING  
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3.7.4. Functional Check  
1. After the analyzer’s components has warmed up for at least 30 minutes, verify that the software  
properly supports any hardware options that were installed.  
2. Check to make sure that the analyzer is functioning within allowable operating parameters.  
Appendix C includes a list of test functions viewable from the analyzer’s front panel as well as  
their expected values. These functions are also useful tools for diagnosing performance  
problems with your analyzer (Section11.1.2). The enclosed Final Test and Validation Data sheet  
(part number 04307) lists these values before the instrument left the factory.  
To view the current values of these parameters press the following button sequence on the analyzer’s  
front panel. Remember until the unit has completed its warm up these parameters may not have  
stabilized.  
SAMPLE  
RANGE = 500.000 PPM  
CO2 = XXX.X  
SETUP  
< TST TST > CAL  
RANGE  
RANGE11  
RANGE21  
O2 RANGE2  
STABIL  
Toggle <TST TST> buttons  
to scroll through list of  
MEAS  
REF  
MR RATIO  
PRES  
Refer to  
Table 6-2 for  
definitions of  
these test  
SAMP FL  
SAMP TEMP  
BENCH TEMP  
WHEEL TEMP  
BOX TEMP  
PHT DRIVE  
SLOPE  
functions.  
1 Only appears instrument is set  
for DUAL or AUTO reporting  
range modes.  
OFFSET  
TEST  
TIME  
2 Only appears if O2 Sensor  
Option is installed.  
If your network is running a dynamic host configuration protocol (DHCP) software package, the  
Ethernet feature will automatically configure its interface with your LAN. (See Section 6.11.6.2).  
This configuration is useful for quickly getting an instrument up and running on a network.  
However, for permanent Ethernet connections, a static IP address should be used. (See Section  
6.11.6.3).  
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3.8. Initial Calibration Procedure  
The next task is to calibrate the analyzer.  
To perform the following calibration you must have sources for zero air and span gas available for input  
into the sample port on the back of the analyzer. See Section 3.1.3 for instructions for connecting these  
gas sources.  
While it is possible to perform this procedure with any range setting we recommend that you perform this  
initial checkout using the 500 ppm range.  
NOTE  
The following procedure assumes that the instrument does not have any of the available  
Zero/Span Valve Options installed.  
See Section 7.4 for instructions for calibrating instruments possessing Z/S valve options.  
1. Set the Analog Output Range:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X  
RANGE CONTROL MENU  
MODE SET UNIT  
Press this button to select the  
concentration units of measure:  
Press this button to set  
the analyzer for SNGL  
DUAL or AUTO ranges  
PPB, PPM, UGM, MGM  
SETUP X.X  
RANGE: 500.000 CONC  
0
0
5
0
0
.0  
ENTR EXIT  
EXIT ignores the new setting and  
returns to the RANGE CONTROL  
MENU.  
To change the value of the  
reporting range span, enter the  
number by pressing the key under  
each digit until the expected value  
appears.  
ENTR accepts the new setting and  
SETUP X.X  
RANGE: 500.000 Conc  
.0  
returns to the  
RANGE CONTROL MENU.  
0
0
0
5
0
ENTR EXIT  
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2. Set the expected CO2 span gas concentration  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP  
< TST TST > CAL  
This sequence causes the  
analyzer to prompt for the  
expected CO2 span  
concentration.  
M-P CAL  
RANGE = 500.000 PPM  
CO2 =X.XXX  
EXIT  
< TST TST > ZERO  
CONC  
The CO2 span  
concentration values  
automatically default to  
400.0 Conc.  
EXIT ignores the new setting  
and returns to the previous  
display.  
ENTR accepts the new setting  
and returns to the  
M-P CAL  
CO2 SPAN CONC: 400.000 Conc  
.0 ENTR EXIT  
To change this value to  
the actual concentration of  
the span gas, enter the  
number by pressing the  
button under each digit  
until the expected value  
appears.  
0
0
0
4
5
previous display..  
NOTE  
For this Initial Calibration it is important to independently verify the precise CO2  
Concentration Value of the SPAN gas.  
If the source of the Span Gas is from a Calibrated Bottle, use the exact  
concentration value printed on the bottle.  
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3. Perform the Zero/Span Calibration Procedure  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =XXX.X  
SETUP  
Set the Display to show the  
STABIL test function.  
This function calculates the  
stability of the COx  
< TST TST > CAL  
measurement  
SAMPLE  
STABIL=XXX.X PPM  
CO2 =XXX.X  
SETUP  
< TST TST > CAL  
ACTION:  
Allow zero gas to enter the sample port at the  
rear of the instrument.  
Wait until STABIL  
falls below 1.0 ppm.  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > CAL  
SETUP  
M-P CAL  
STABIL=XXX.X PPM  
CONC  
CO2 =XXX.X  
EXIT  
< TST TST > ZERO  
Press ENTR to changes the  
OFFSET & SLOPE values for the  
CO2 measurements.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > ENTR  
CONC  
EXIT  
Press EXIT to leave the calibration  
unchanged and return to the  
previous menu.  
ACTION:  
Allow span gas to enter the sample port at the  
rear of the instrument.  
The value of  
STABIL may jump  
significantly.  
Wait until it falls back  
below 1.0 ppm  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
EXIT  
The SPAN button now  
appears during the  
transition from zero to  
span..  
< TST TST >  
M-P CAL  
SPAN CONC  
If either the ZERO or  
SPAN buttons fail to  
appear see Section 11  
for troubleshooting tips.  
Press ENTR to change the  
OFFSET & SLOPE values for the  
CO2 measurements.  
RANGE = 500.000 PPM CO2 =XXX.X  
EXIT  
Press EXIT to leave the calibration  
unchanged and return to the  
previous menu.  
< TST TST > ENTR SPAN CONC  
M-P CAL  
RANGE = 500.000 PPM CO2 =XXX.X  
CONC EXIT  
EXIT returns to the main  
SAMPLE display  
< TST TST > ENTR  
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3.8.1. Initial O2 Sensor Calibration Procedure  
If your instrument has an O2 sensor option installed that should be calibrated as well.  
3.8.1.1. O2 Calibration Setup  
The pneumatic connections for calibrating are as follows:  
Figure 3-16:  
O2 Sensor Calibration Set Up  
O2 SENSOR ZERO GAS: Teledyne Instruments’ recommends using pure N2 when calibration the zero  
point of your O2 sensor option.  
O2 SENSOR SPAN GAS: Teledyne Instruments’ recommends using 21% O2 in N2 when calibration the  
span point of your O2 sensor option.  
3.8.1.2. O2 Calibration Method  
STEP 1 – SET O2 SPAN GAS CONCENTRATION :  
Set the expected O2 span gas concentration.  
This should be equal to the percent concentration of the O2 span gas of the selected reporting range  
(default factory setting = 20.8%; the approximate O2 content of ambient air).  
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SAMPLE  
RANGE = 500.000 PPM  
CAL  
CO2 =XXX.X  
< TST TST >  
SETUP  
SAMPLE  
GAS TO CAL:CO2  
CO2 O2  
ENTR EXIT  
M-P CAL  
A1:NXCNC1 =100PPM  
NOX=X.XXX  
EXIT  
<TST TST> ZERO SPAN CONC  
SAMPLE  
GAS TO CAL:O2  
NOX O2  
ENTR EXIT  
M-P CAL  
0
O2 SPAN CONC:20.8%  
.8  
EXIT ignores the new  
setting and returns to  
the previous display.  
2
0
0
ENTR EXIT  
ENTR accepts the new  
setting and returns to  
the previous menu.  
The O2 span concentration value automatically defaults to  
20.8 %.  
If this is not the the concentration of the span gas being  
used, toggle these buttons to set the correct concentration  
of the O2 calibration gases.  
STEP 2 – ACTIVATE O2 SENSOR STABILITY FUNCTION  
To change the stability test function from NOx concentration to the O2 sensor output, press:  
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SAMPLE  
RANGE = 500.000 PPM  
CAL  
CO2 =XXX.X  
SETUP X.X  
0) DAS_HOLD_OFF=15.0 Minutes  
EDIT PRNT EXIT  
< TST TST >  
SETUP  
<PREV NEXT> JUMP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
Continue pressing NEXT until ...  
SETUP X.X  
SECONDARY SETUP MENU  
SETUP X.X  
2) STABIL_GAS=CO2  
COMM VARS DIAG ALRM  
<PREV NEXT> JUMP  
EDIT PRNT EXIT  
SETUP X.X  
ENTER PASSWORD:818  
SETUP X.X  
CO2 O2  
STABIL_GAS:CO2  
8
1
8
ENTR EXIT  
ENTR EXIT  
SETUP X.X  
STABIL_GAS:O2  
ENTR EXIT  
CO2 O2  
Press EXIT 3  
times to return  
to SAMPLE  
menu  
NOTE  
Use the same procedure to reset the STB test function to CO2 when the O2  
calibration procedure is complete.  
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STEP 4 – O2 Zero/Span Calibration perform by pressing:  
The Model GFC 7000TA Analyzer is now ready for operation.  
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NOTE  
Once you have completed the above set-up procedures, please fill out the Quality  
Questionnaire that was shipped with your unit and return it to Teledyne  
Instruments.  
This information is vital to our efforts in continuously improving our service and  
our products.  
THANK YOU.  
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4. FREQUENTLY ASKED QUESTIONS  
4.1. FAQ’s  
The following is a list from the Teledyne Instruments’ Customer Service Department of the most  
commonly asked questions relating to the Model CO2 Analyzer.  
Q: How do I get the instrument to zero / Why is the zero key not displayed?  
A: See Section 11.3.4 Inability to zero.  
Q: How do I get the instrument to span / Why is the span key not displayed?  
A: See Section 11.3.3 Inability to span.  
Q: Why does the ENTR key sometimes disappear on the Front Panel Display?  
A: During certain types of adjustments or configuration operations, the ENTR key will disappear if you  
select a setting that is nonsensical (such as trying to set the 24-hour clock to 25:00:00) or out of the  
allowable range for that parameter (such as selecting a DAS Holdoff period of more than 20 minutes).  
Once you adjust the setting in question to an allowable value, the ENTR key will re-appear.  
Q: Is there an optional midpoint calibration?  
A: There is an optional mid point linearity adjustment; however, midpoint adjustment is applicable only  
to applications where CO2 measurements are expected above 100 ppm. Call Teledyne Instruments’  
Service Department for more information on this topic.  
Q: How do I make the display and data logger analog input agree?  
A: This most commonly occurs when an independent metering device is used besides the data  
logger/recorded to determine gas concentration levels while calibrating the analyzer. These  
disagreements result from the analyzer, the metering device and the data logger having slightly  
different ground levels.  
Both the electronic scale and offset of the analog outputs can be adjusted (see Section 6.13.4.3).  
Alternately, use the data logger itself as the metering device during calibrations procedures.  
Q: How do I perform a leak check?  
A: See Section 9.3.3.  
Q: How do I measure the sample flow?  
A: Sample flow is measured by attaching a calibrated rotameter, wet test meter, or other flow-  
measuring device to the sample inlet port when the instrument is operating. The sample flow should  
be 800 cm3/min 10%. See Section 9.3.4.  
Q: How long does the IR source last?  
A: Typical lifetime is about 2-3 years.  
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Q: Where is the sintered filter/sample flow control orifice?  
A: These components are located inside the flow control assembly that is attached to the inlet side of  
the sample pump, see Figure 3-3. See Section 11.6.1 for instructions on disassembly and  
replacement.  
Q: How do I set up a SEQUENCE to run a nightly calibration check?  
A: The setup of this option is located in Section 7.6.  
Q: How do I set the analog output signal range and offset?  
A: Instructions for this can be found in Section 6.13.4 which describes analog I/O configuration.  
Q: What is the averaging time for an GFC 7000TA?  
A: The default averaging time, optimized for ambient pollution monitoring, is 150 seconds for stable  
concentrations and 10 seconds for rapidly changing concentrations; See Section10.5.1 for more  
information. However, it is adjustable over a range of 0.5 second to 200 seconds (please contact  
customer service for more information).  
4.2. Glossary  
Note: Some terms in this glossary may not occur elsewhere in this manual.  
Term  
10BaseT  
Description/Definition  
an Ethernet standard that uses twisted (“T”) pairs of copper wires to transmit at  
10 megabits per second (Mbps)  
100BaseT  
APICOM  
ASSY  
same as 10BaseT except ten times faster (100 Mbps)  
name of a remote control program offered by Teledyne to its customers  
Assembly  
CAS  
Code-Activated Switch  
CD  
Corona Discharge, a frequently luminous discharge, at the surface of a  
conductor or between two conductors of the same transmission line,  
accompanied by ionization of the surrounding atmosphere and often by a power  
loss  
CE  
Converter Efficiency, the percentage of light energy that is actually converted  
into electricity  
CEM  
Continuous Emission Monitoring  
Chemical formulas that may be included in this document:  
CO2  
C3H8  
CH4  
H2O  
HC  
carbon dioxide  
propane  
methane  
water vapor  
general abbreviation for hydrocarbon  
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Term  
Description/Definition  
HNO3  
H2S  
NO  
nitric acid  
hydrogen sulfide  
nitric oxide  
NO2  
NOX  
NOy  
nitrogen dioxide  
nitrogen oxides, here defined as the sum of NO and NO2  
nitrogen oxides, often called odd nitrogen: the sum of NOX plus other  
compounds such as HNO3 (definitions vary widely and may include nitrate (NO3),  
PAN, N2O and other compounds as well)  
NH3  
O2  
ammonia  
molecular oxygen  
ozone  
O3  
SO2  
sulfur dioxide  
cm3  
metric abbreviation for cubic centimeter (replaces the obsolete abbreviation  
“cc”)  
CPU  
DAC  
DAS  
DCE  
DFU  
Central Processing Unit  
Digital-to-Analog Converter  
Data Acquisition System  
Data Communication Equipment  
Dry Filter Unit  
DHCP  
Dynamic Host Configuration Protocol. A protocol used by LAN or Internet  
servers to automatically set up the interface protocols between themselves and  
any other addressable device connected to the network  
DIAG  
DOM  
Diagnostics, the diagnostic settings of the analyzer.  
Disk On Module, a 44-pin IDE flash drive with up to 128MB storage capacity for  
instrument’s firmware, configuration settings and data  
DOS  
Disk Operating System  
DRAM  
DR-DOS  
DTE  
Dynamic Random Access Memory  
Digital Research DOS  
Data Terminal Equipment  
EEPROM  
Electrically Erasable Programmable Read-Only Memory also referred to as a  
FLASH chip or drive  
ESD  
Electro-Static Discharge  
Electrical Test  
ETEST  
Ethernet  
a standardized (IEEE 802.3) computer networking technology for local area  
networks (LANs), facilitating communication and sharing resources  
FEP  
Fluorinated Ethylene Propylene polymer, one of the polymers that Du Pont  
markets as Teflon®  
Flash  
FPI  
non-volatile, solid-state memory  
Fabry-Perot Interface: a special light filter typically made of a transparent plate  
with two reflecting surfaces or two parallel, highly reflective mirrors  
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Term  
Description/Definition  
GFC  
Gas Filter Correlation  
I2C bus  
a clocked, bi-directional, serial bus for communication between individual  
analyzer components  
IC  
Integrated Circuit, a modern, semi-conductor circuit that can contain many basic  
components such as resistors, transistors, capacitors etc in a miniaturized  
package used in electronic assemblies  
IP  
Internet Protocol  
IZS  
Internal Zero Span  
Local Area Network  
Liquid Crystal Display  
Light Emitting Diode  
Liters Per Minute  
LAN  
LCD  
LED  
LPM  
MFC  
Mass Flow Controller  
Measure/Reference  
M/R  
MOLAR MASS  
the mass, expressed in grams, of 1 mole of a specific substance. Conversely,  
one mole is the amount of the substance needed for the molar mass to be the  
same number in grams as the atomic mass of that substance.  
EXAMPLE: The atomic weight of Carbon is 12 therefore the molar mass of  
Carbon is 12 grams. Conversely, one mole of carbon equals the amount of  
carbon atoms that weighs 12 grams.  
Atomic weights can be found on any Periodic Table of Elements.  
Non-Dispersive Infrared  
NDIR  
NIST-SRM  
PC  
National Institute of Standards and Technology - Standard Reference Material  
Personal Computer  
PCA  
Printed Circuit Assembly, the PCB with electronic components, ready to use  
Personal Computer / Advanced Technology  
PC/AT  
PCB  
Printed Circuit Board, the bare board without electronic component  
PFA  
Per-Fluoro-Alkoxy, an inert polymer; one of the polymers that Du Pont markets  
as Teflon®  
PLC  
Programmable Logic Controller, a device that is used to control instruments  
based on a logic level signal coming from the analyzer  
PLD  
PLL  
PMT  
Programmable Logic Device  
Phase Lock Loop  
Photo Multiplier Tube, a vacuum tube of electrodes that multiply electrons  
collected and charged to create a detectable current signal  
P/N (or PN)  
PSD  
Part Number  
Prevention of Significant Deterioration  
PTFE  
Poly-Tetra-Fluoro-Ethylene, a very inert polymer material used to handle gases  
that may react on other surfaces; one of the polymers that Du Pont markets as  
Teflon®  
PVC  
Poly Vinyl Chloride, a polymer used for downstream tubing  
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Term  
Description/Definition  
Rdg  
Reading  
RS-232  
specification and standard describing a serial communication method between  
DTE (Data Terminal Equipment) and DCE (Data Circuit-terminating Equipment)  
devices, using a maximum cable-length of 50 feet  
RS-485  
specification and standard describing a binary serial communication method  
among multiple devices at a data rate faster than RS-232 with a much longer  
distance between the host and the furthest device  
SAROAD  
SLAMS  
SLPM  
Storage and Retrieval of Aerometric Data  
State and Local Air Monitoring Network Plan  
Standard Liters Per Minute of a gas at standard temperature and pressure  
Standard Temperature and Pressure  
STP  
TCP/IP  
Transfer Control Protocol / Internet Protocol, the standard communications  
protocol for Ethernet devices  
TEC  
TPC  
USB  
Thermal Electric Cooler  
Temperature/Pressure Compensation  
Universal Serial Bus: a standard connection method to establish communication  
between peripheral devices and a host controller, such as a mouse and/or  
touchscreen and a personal computer or laptop  
VARS  
V-F  
Variables, the variable settings of the instrument  
Voltage-to-Frequency  
Z/S  
Zero / Span  
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5. OPTIONAL HARDWARE AND SOFTWARE  
This includes a brief description of the hardware and software options available for the Model GFC  
7000TA Gas Filter Correlation Carbon Dioxide Analyzer. For assistance with ordering these options  
please contact the Sales department of Teledyne Analytical Instruments at:  
TELEDYNE ELECTRONIC TECHNOLOGIES  
Analytical Instruments  
16830 Chestnut Street  
City of Industry, CA 91748  
Telephone: (626) 934-1500  
Fax: (626) 961-2538  
Web: www.teledyne-ai.com  
5.1. Rack Mount Kits (Options 20A, 20B, 21 and 23)  
OPTION NUMBER  
DESCRIPTION  
Rack mount brackets with 26 in. chassis slides.  
Rack mount brackets with 24 in. chassis slides.  
Rack mount brackets only  
20A  
20B  
21  
23  
Rack Mount for External Pump Pack (No Slides).  
Each of these options permits the Analyzer to be mounted in a standard 19" x 30" RETMA rack.  
5.2. Current Loop Analog Outputs (Option 41)  
This option adds isolated, voltage-to-current conversion circuitry to the analyzer’s analog outputs. This  
option may be ordered separately for any of the analog outputs; it can be installed at the factory or added  
later. Call TAI sales for pricing and availability.  
The current loop option can be configured for any output range between 0 and 20 mA. Figure 5-1  
provides installation instructions and illustrates a sample combination of one current output and two  
voltage outputs configuration. Information on calibrating or adjusting these outputs can be found in  
Section 6.13.4.4.  
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Figure 5-1:  
Current Loop Option Installed on the Motherboard  
5.2.1. Converting Current Loop Analog Outputs to Standard Voltage  
Outputs  
NOTE  
Servicing or handling of circuit components requires electrostatic discharge  
protection, i.e. ESD grounding straps, mats and containers. Failure to use ESD  
protection when working with electronic assemblies will void the instrument  
warranty.  
See Section 12 for more information on preventing ESD damage.  
To convert an output configured for current loop operation to the standard 0 to 5 VDC output operation:  
1. Turn off power to the analyzer.  
2. If a recording device was connected to the output being modified, disconnect it.  
3. Remove the top cover  
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Remove the set screw located in the top, center of the rear panel  
Remove the screws fastening the top cover to the unit (four per side).  
Slide the cover back and lift straight up .  
4. Disconnect the current loop option PCA from the appropriate connector on the motherboard (see  
Figure 5-1).  
5. Place a shunt between the leftmost two pins of the connector (see Figure 5-1).  
6. Reattach the top case to the analyzer.  
7. The analyzer is now ready to have a voltage-sensing, recording device attached to that output  
5.3. Expendable Kits (Options 42C, 42D and 43)  
OPTION NUMBER  
DESCRIPTION  
OPT 42C  
1 year’s supply of replacement of 47mm dia. particulate filters  
OPT 42D  
1 full replacement’s volume of indicating soda-lime for the external CO2 scrubber  
included with options 51 & 53 (approximate active lifetime: 1 year)  
OPT 43  
Options 42 C & 42D  
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5.4. Calibration Valves Options  
There are four available options involving Zero/span valves. From an operational and software  
standpoint, all of the options are the same, only the source of the span and zero gases are different.  
5.4.1. Ambient Zero/Pressurized Span Valve  
This option requires that both zero air and span gas be supplied from external sources. It is specifically  
designed for applications where span gas will be supplied from a pressurized bottle of calibrated CO2 gas.  
A critical flow control orifice, internal to the instrument ensures that the proper flow rate is maintained. An  
internal vent line, isolated by a shutoff valve ensures that the gas pressure of the span gas is reduced to  
ambient atmospheric pressure. Normally zero air would be supplied from zero air modules such as a  
Teledyne Instruments Model 701.  
In order to ensure that span gas does not migrate backwards through the vent line and alter the  
concentration of the span gas, a gas line not less than 2 meters in length should be attached to the vent  
span outlet on the rear panel of the analyzer. To prevent the buildup of back pressure, this vent line  
should not be greater than 10 meters in length.  
The following table describes the state of each valve during the analyzer’s various operational modes.  
Table 5-1: Ambient Zero/Pressurized Span Valve Operating States  
MODE  
VALVE  
CONDITION  
Sample/Cal  
Zero/Span  
Open to SAMPLE inlet  
Open to IZS inlet  
Closed  
SAMPLE  
(Normal State)  
Shutoff Valve  
Sample/Cal  
Zero/Span  
Open to ZERO/SPAN valve  
Open to IZS inlet  
Closed  
ZERO CAL  
SPAN CAL  
Shutoff Valve  
Sample/Cal  
Zero/Span  
Open to ZERO/SPAN valve  
Open to SHUTOFF valve  
Shutoff Valve  
Open to PRESSURE SPAN Inlet  
The minimum span gas flow rate required for this option is 800 cm3/min.  
The state of the zero/span valves can also be controlled:  
Manually from the analyzer’s front panel by using the SIGNAL I/O controls located under the DIAG  
Menu (Section 6.13.2),  
By activating the instrument’s AutoCal feature (Section 7.6),  
Remotely by using the external digital control inputs (Section 6.15.1.2 and Section 7.5.2), or;  
Remotely through the RS-232/485 serial I/O ports (see Appendix A-6 for the appropriate commands).  
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Figure 5-2:  
Internal Pneumatic Flow – Ambient Zero/Pressurized Span Valves  
5.4.2. Ambient Zero/Ambient Span Valve  
This valve option is intended for applications where zero air is supplied by a zero air generator like a  
bottle of N2 and span gas are being supplied by Gas Dilution Calibrator like the Teledyne Instruments  
Model 700 or 702. Internal zero/span and sample/cal valves control the flow of gas through the  
instrument, but because the calibrator limits the flow of span gas no shutoff valve is required.  
In order to ensure that span gas does not migrate backwards through the vent line and alter the  
concentration of the span gas, a gas line not less than 2 meters in length should be attached to the vent  
span outlet on the rear panel of the analyzer. To prevent the buildup of back pressure, this vent line  
should not be greater than 10 meters in length.  
The following table describes the state of each valve during the analyzer’s various operational modes.  
Table 5-2: Ambient Zero/Ambient Span Valve Operating States  
Mode  
Valve  
Condition  
Sample/Cal  
Zero/Span  
Open to SAMPLE inlet  
Open to IZS inlet  
SAMPLE  
(Normal State)  
Sample/Cal  
Zero/Span  
Open to ZERO/SPAN valve  
Open to IZS inlet  
ZERO CAL  
SPAN CAL  
Sample/Cal  
Zero/Span  
Open to ZERO/SPAN valve  
Open to PRESSURE SPAN inlet  
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The minimum span gas flow rate required for this option is 800 cm3/min.  
The state of the zero/span valves can also be controlled:  
Manually from the analyzer’s front panel by using the SIGNAL I/O controls located under the DIAG  
Menu (Section 6.13.2),  
By activating the instrument’s AutoCal feature (Section 7.6),  
Remotely by using the external digital control inputs (Sections 6.15.1.2 and 7.5.2), or  
Remotely through the RS-232/485 serial I/O ports (see Appendix A-6).  
Figure 5-3:  
Internal Pneumatic Flow – Ambient Zero/Ambient Span  
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5.5. Communication Options  
5.5.1. Communications Cables  
Type  
Description  
Shielded, straight-through DB-9F to DB-25M cable, about 1.8 m long.  
Used to interface with older computers or code activated switches with  
DB-25 serial connectors.  
60A  
RS-232  
Shielded, straight-through DB-9F to DB-9F cable of about 1.8 m  
length.  
60B  
60C  
60D  
RS-232  
Ethernet  
USB  
Patch cable, 2 meters long, used for Internet and LAN  
communications.  
Cable for direct connection between instrument (rear panel USB port)  
and PC or laptop computer.  
5.5.2. RS-232 Multidrop (Option 62)  
The multidrop option is used with any of the RS-232 serial ports to enable communications of up to eight  
analyzers with the host computer over a chain of RS-232 cables via the instruments COM1 port (labeled  
RS232. It is subject to the distance limitations of the RS 232 standard.  
The option consists of a small printed circuit assembly, which is seated on the analyzer’s CPU card (see  
Figure 5-4) and is connected to the RS-232 and COM2 DB9 connectors on the instrument’s back panel  
via a cable to the motherboard. One option 62 is required for each analyzer along with one 6’ straight-  
through, DB9 male DB9 Female cable (P/N WR0000101).  
For information on using and setting up this option (See Section 6.11.7)  
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Figure 5-4:  
Multi-drop/LVDS PCA Seated on CPU  
5.6. Oxygen Sensor (OPT 65)  
5.6.1. Theory of Operation  
5.6.1.1. Paramagnetic measurement of O2  
The oxygen sensor used in the GFC 7000TA analyzer utilizes the fact that oxygen is attracted into strong  
magnetic field; most other gases are not, to obtain fast, accurate oxygen measurements.  
The sensor’s core is made up of two nitrogen filled glass spheres, which are mounted on a rotating  
suspension within a magnetic field (Figure 5-7). A mirror is mounted centrally on the suspension and light  
is shone onto the mirror that reflects the light onto a pair of photocells. The signal generated by the  
photocells is passed to a feedback loop, which outputs a current to a wire winding (in effect, a small DC  
electric motor) mounted on the suspended mirror.  
Oxygen from the sample stream is attracted into the magnetic field displacing the nitrogen filled spheres  
and causing the suspended mirror to rotate. This changes the amount of light reflected onto the  
photocells and therefore the output levels of the photocells. The feedback loop increases the amount of  
current fed into the winding in order to move the mirror back into its original position. The more O2  
present, the more the mirror moves and the more current is fed into the winding by the feedback control  
loop.  
A sensor measures the amount of current generated by the feedback control loop which is directly  
proportional to the concentration of oxygen within the sample gas mixture (see Figure 5-7).  
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Figure 5-5:  
Oxygen Sensor - Principle of Operation  
5.6.1.2. Operation within the GFC 7000TA Analyzer  
The oxygen sensor option is transparently integrated into the core analyzer operation. All functions can  
be viewed or accessed through the front panel, just like the functions for CO2  
The O2 concentration is displayed in the upper right-hand corner, alternating with CO2  
concentration.  
Test functions for O2 slope and offset are viewable from the front panel along with the analyzer’s  
other test functions.  
O2 sensor calibration is performed via the front panel CAL function and is performed in a nearly  
identical manner as the standard CO2 calibration. See Section 3.3.1 for more details.  
Stability of the O2 sensor can be viewed via the front panel (see Section 3.3.2.1).  
A signal representing the currently measured O2 concentration is available.  
The O2 concentration range is 0-100% (user selectable) with 0.1% precision and accuracy and is  
available to be output via the instrument’s analog output channel A3 (See Section 6.13.4).  
The temperature of the O2 sensor is maintained at a constant 50° C by means of a PID loop and can be  
viewed on the front panel as test function O2 TEMP.  
The O2 sensor assembly itself does not have any serviceable parts and is enclosed in an insulated  
canister.  
5.6.1.3. Pneumatic Operation of the O2 Sensor  
Pneumatically, the O2 sensor is connected to the bypass manifold and draws a flow of about 120  
cm³/min in addition to the normal sample flow rate and is separately controlled with its own critical  
flow orifice. Figure 5-8 shows the internal pneumatics of the GFC 7000TA with the O2 Sensor  
installed.  
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Figure 5-6:  
GFC 7000TA – Internal Pneumatics with O2 Sensor Option 65  
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5.7. Special Features  
5.7.1. Dilution Ratio Option  
The Dilution Ration Option is a software option that is designed for applications where the Sample gas is  
diluted before being analyzed by the Model GFC 7000TA. Typically this occurs in Continuous Emission  
Monitoring (CEM) applications where the quality of gas in a smoke stack is being tested and the sampling  
method used to remove the gas from the stack dilutes the gas.  
Once the degree of dilution is known, this feature allows the user to add an appropriate scaling factor to  
the analyzer’s CO2 concentration calculation so that the Measurement Range and concentration values  
displayed on the instrument’s Front Panel Display and reported via the Analog and Serial Outputs reflect  
the undiluted values.  
Instructions for using the dilution ratio option can be found in Section 6.8.7.  
5.7.2. Maintenance Mode Switch  
TAI’s instruments can be equipped with a switch that places the instrument in maintenance mode. When  
present, the switch accessed by opening the hinged front panel and is located on the rearward facing side  
of the display/touchscreen driver PCA; on the left side; near the particulate filter.  
When in maintenance mode the instrument ignores all commands received via the com ports that alter  
the operation state of the instrument. This includes all calibration commands, diagnostic menu commands  
and the reset instrument command. The instrument continues to measure concentration and send data  
when requested.  
This option is of particular use for instruments connected to multidrop or Hessen protocol networks.  
5.7.3. Second Language Switch  
TAI’s instruments can be equipped with switch that activates an alternate set of display message in a  
language other than the instruments default language. When present, the switch accessed by opening  
the hinged front panel and is located on the rearward facing side of the display/touchscreen driver PCA;  
on the right side.  
To activate this feature, the instrument must also have a specially programmed Disk on Chip containing  
the second language.  
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6. OPERATING INSTRUCTIONS  
To assist in navigating the analyzer’s software, a series of menu trees can be found in Appendix A-1 of  
this manual.  
NOTES  
The flow charts appearing in this contain typical representations of the analyzer’s display  
during the various operations being described. These representations may differ slightly  
from the actual display of your instrument.  
The ENTR button may disappear if you select a setting that is invalid or out of the allowable  
range for that parameter, such as trying to set the 24-hour clock to 25:00:00. Once you  
adjust the setting to an allowable value, the ENTR button will re-appear.  
6.1. Overview of Operating modes  
The GFC 7000TA software has a variety of operating modes. Most commonly, the analyzer will be  
operating in SAMPLE mode. In this mode, a continuous read-out of the CO2 concentration is displayed  
on the front panel and output as an analog voltage from rear panel terminals, calibrations can be  
performed, and TEST functions and WARNING messages can be examined.  
The second most important operating mode is SETUP mode. This mode is used for performing certain  
configuration operations, such as for the DAS system, the reporting ranges, or the serial (RS-232/RS-  
485/Ethernet) communication channels. The SET UP mode is also used for performing various  
diagnostic tests during troubleshooting.  
Figure 6-1:  
Front Panel Display  
The Mode field of the front panel display indicates to the user which operating mode the unit is currently  
running.  
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Besides SAMPLE and SETUP, other modes the analyzer can be operated in are:  
Table 6-1: Analyzer Operating modes  
MODE  
DIAG  
MEANING  
One of the analyzer’s diagnostic modes is being utilized (See Section 6.13).  
M-P CAL  
This is the basic, multi-point calibration mode of the instrument and is activated by pressing  
the CAL key.  
SAMPLE  
SAMPLE A  
SETUP1  
Sampling normally, flashing indicates adaptive filter is on.  
Indicates that unit is in SAMPLE Mode and AUTOCAL feature is activated.  
SETUP mode is being used to configure the analyzer (CO2 sampling will continue during this  
process).  
SPAN CAL A  
Unit is performing span cal procedure initiated automatically by the analyzer’s AUTOCAL  
feature.  
SPAN CAL M  
SPAN CAL R  
Unit is performing span cal procedure initiated manually by the user.  
Unit is performing span cal procedure initiated remotely via the RS-232, RS-4485 or digital i/o  
control inputs.  
ZERO CAL A  
Unit is performing zero cal procedure initiated automatically by the analyzer’s AUTOCAL  
feature.  
ZERO CAL M  
ZERO CAL R  
Unit is performing zero cal procedure initiated manually by the user.  
Unit is performing zero cal procedure initiated remotely via the RS-232, RS-4485 or digital I/O  
control inputs.  
1 The revision of the Teledyne Instruments software installed in this analyzer will be displayed following the word  
SETUP. E.g. “SETUP G.4”  
Finally, the various CAL modes allow calibration of the analyzer. Because of its importance, this mode is  
described separately in Section 7.  
6.2. Sample Mode  
This is the analyzer’s standard operating mode. In this mode the instrument is analyzing the gas in the  
sample chamber, calculating CO2 concentration and reporting this information to the user via the front  
panel display, the analog outputs and, if set up properly, the RS-232/485/Ethernet ports.  
NOTE  
A value of “XXXX” displayed in the CO2 Concentration field means that the M/R  
ratio is invalid because CO2 REF is either too high (> 4950 mVDC) or too low (<  
1250 VDC).  
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6.2.1. Test Functions  
Test functions are shown on the front panel display while the analyzer is in SAMPLE mode. They provide  
information about the present operating status of the instrument and can be used troubleshooting and can  
be recorded in one of the DAS channels (Section 6.7) for data analysis. To view, press the <TST TST> buttons.  
Table 6-2: Test Functions Defined  
PARAMETER  
DISPLAY  
RANGE  
UNITS  
MEANING  
Range  
The full scale limit at which the reporting range of the analyzer is  
currently set. THIS IS NOT the Physical Range of the instrument.  
See Section 6.8.1 for more information.  
PPB, PPM,  
UGM, MGM  
RANGE11  
RANGE21  
O2 Range  
Stability  
O2 RANGE  
STABIL  
%
The range setting for the O2 Sensor  
PPB, PPM  
UGM, MGM  
Standard deviation of CO2 concentration readings. Data points are  
recorded every ten seconds using the last 25 data points.  
CO2 Measure  
The demodulated, peak IR detector output during the measure  
portion of the GFC Wheel cycle.  
MEAS  
REF  
MV  
MV  
CO2 Reference  
The demodulated, peak IR detector output during the reference  
portion of the GFC wheel cycle.  
Measurement /  
Reference Ratio  
The result of CO2 MEAS divided by CO2 REF. This ratio is the  
primary value used to compute CO2 concentration. The value  
displayed is not linearized.  
MR Ratio  
PRES  
-
Sample Pressure  
Sample Flow  
The absolute pressure of the Sample gas as measured by a  
pressure sensor located inside the sample chamber.  
In-Hg-A  
cc/min  
Sample mass flow rate. This is computed from the differential  
between the pressures measured up-stream and down-stream of the  
sample critical flow orifice pressures.  
SAMPLE FL  
Sample  
Temperature  
SAMP TEMP  
The temperature of the gas inside the sample chamber.  
Optical bench temperature.  
C  
Bench  
Temperature  
BENCH TEMP  
C  
Wheel  
Temperature  
WHEEL TEMP  
BOX TEMP  
Filter wheel temperature.  
C  
C  
C  
Box Temperature  
The temperature inside the analyzer chassis.  
O2 sensor cell temperature.  
O2 Cell  
O2 CELL  
TEMP2  
Temperature2  
Photo-detector  
Temp. Control  
Voltage  
The drive voltage being supplied to the thermoelectric coolers of the  
IR photo-detector by the sync/demod Board.  
PHT DRIVE  
SLOPE  
mV  
Slope  
The sensitivity of the instrument as calculated during the last  
calibration activity. The SLOPE parameter is used to set the span  
calibration point of the analyzer.  
-
-
Offset  
The overall offset of the instrument as calculated during the last  
calibration activity. The OFFSET parameter is used to set the zero  
point of the analyzer response.  
OFFSET  
O2 Sensor Slope 2  
O2 Sensor Offset 2  
O2 SLOPE  
-
-
O2 slope, computed during zero/span calibration.  
O2 offset, computed during zero/span calibration.  
O2 OFFSET  
Test channel  
output signal  
Displays the signal level of the TEST analog output channel. Only  
appears when the TEST channel has been activated.  
TEST  
mV, mA  
Current Time  
The current time. This is used to create a time stamp on DAS  
readings, and by the AUTOCAL feature to trigger calibration events.  
TIME  
-
1 Only appears when the instrument’s reporting range mode is set for DUAL or AUTO  
2 Only appears when the optional O2 sensor is installed.  
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To view the TEST Functions press:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 = XXX.X  
SETUP  
< TST TST > CAL  
RANGE  
RANGE11  
RANGE21  
O2 RANGE  
STABIL  
Toggle <TST TST> buttons  
to scroll through list of  
MEAS  
REF  
MR RATIO  
PRES  
Refer to  
Table 6-2 for  
definitions of  
these test  
SAMP FL  
SAMP TEMP  
BENCH TEMP  
WHEEL TEMP  
BOX TEMP  
PHT DRIVE  
SLOPE  
functions.  
1 Only appears instrument is set  
for DUAL or AUTO reporting  
range modes.  
OFFSET  
TEST  
TIME  
2 Only appears if O2 Sensor  
Option is installed.  
Figure 6-2:  
Viewing TEST Functions  
NOTE  
A value of “XXXX” displayed for any of the TEST functions indicates an out-of-  
range reading or the analyzer’s inability to calculate it.  
All pressure measurements are represented in terms of absolute pressure.  
Absolute, atmospheric pressure is 29.92 in-Hg-A at sea level. It decreases about 1  
in-Hg per 300 m gain in altitude. A variety of factors such as air conditioning and  
passing storms can cause changes in the absolute atmospheric pressure.  
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6.2.2. Warning Messages  
The most common instrument failures will be reported as a warning on the analyzer’s front panel and  
through the COM ports. Section 11.1.1 explains how to use these messages to troubleshoot problems.  
Section 3.2.3 shows how to view and clear warning messages.  
Table 6-3 lists all warning messages for the current version of software.  
Table 6-3: List of Warning Messages  
MESSAGE  
MEANING  
The instrument’s A/D circuitry or one of its analog outputs is not calibrated.  
The Temperature of the optical bench is outside the specified limits.  
Remote span calibration failed while the dynamic span feature was set to turned on  
Remote zero calibration failed while the dynamic zero feature was set to turned on  
Configuration was reset to factory defaults or was erased.  
Concentration alarm 1 is enabled and the measured CO2 level is ≥ the set point.  
Concentration alarm 2 is enabled and the measured CO2 level is ≥ the set point.  
Configuration storage was reset to factory configuration or erased.  
DAS data storage was erased.  
ANALOG CAL WARNING  
BENCH TEMP WARNING  
BOX TEMP WARNING  
CANNOT DYN SPAN  
CANNOT DYN ZERO  
CONC ALRM1 WARNING  
CONC ALRM2 WARNING  
CONFIG INITIALIZED  
DATA INITIALIZED  
O2 sensor cell temperature outside of warning limits.  
O2 CELL TEMP WARN  
PHOTO TEMP WARNING  
REAR BOARD NOT DET  
RELAY BOARD WARN  
SAMPLE FLOW WARN  
SAMPLE PRESS WARN  
SAMPLE TEMP WARN  
SOURCE WARNING  
The temperature of the IR photometer is outside the specified limits.  
The CPU is unable to communicate with the motherboard.  
The firmware is unable to communicate with the relay board.  
The flow rate of the sample gas is outside the specified limits.  
Sample gas pressure outside of operational parameters.  
The temperature of the sample gas is outside the specified limits.  
The IR source may be faulty.  
The computer was rebooted.  
SYSTEM RESET  
The Gas Filter Correlation wheel temperature is outside the specified limits.  
WHEEL TEMP WARNING  
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To view and clear warning messages:  
SAMPLE  
SYSTEM RESET  
CAL  
CO2 = 0.00  
TEST deactivates warning  
TEST  
MSG  
CLR SETUP  
messages  
SAMPLE  
RANGE=500.000 PPM  
MSG  
CO2 = 0.00  
MSG displays warning messages.  
< TST TST > CAL  
CLR SETUP  
SAMPLE  
SYSTEM RESET  
CO2 = 0.00  
Press CLR to clear the current  
message.  
TEST  
CAL  
MSG  
CLR SETUP  
NOTE:  
If more than one warning is active, the  
next message will take its place  
If the warning message persists  
after several attempts to clear it,  
the message may indicate a  
real problem and not an artifact  
of the warm-up period  
Once the last warning has been  
cleared, the analyzer returns to  
SAMPLE mode  
Figure 6-3:  
Viewing and Clearing GFC 7000TA WARNING Messages  
6.3. Calibration Mode  
Pressing the CAL key switches the GFC 7000TA into multi-point calibration mode. In this mode, the user  
can calibrate the instrument or check the instruments calibration with the use of calibrated zero or span  
gases.  
If the instrument includes either the zero/span valve option or IZS option, the display will also include  
CALZ and CALS keys. Pressing either of these keys also puts the instrument into multipoint calibration  
mode.  
The CALZ key is used to initiate a calibration of the zero point.  
The CALS key is used to calibrate the span point of the analyzer. It is recommended that this span  
calibration is performed at 90% of full scale of the analyzer’s currently selected reporting range.  
Because of their critical importance and complexity, calibration operations are described in detail in  
Section 7 of this manual. For more information concerning the zero/span, zero/span and IZS valve  
options, See Section 5.4.  
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6.4. SETUP MODE  
The SETUP mode contains a variety of choices that are used to configure the analyzer’s hardware and  
software features, perform diagnostic procedures, gather information on the instruments performance and  
configure or access data from the internal data acquisition system (DAS). For a visual representation of  
the software menu trees, refer to Appendix A. The areas access under the Setup mode are:  
Table 6-4: Primary Setup Mode Features and Functions  
TOUCHSCREEN  
BUTTON  
MANUAL  
SECTION  
MODE OR  
FEATURE  
DESCRIPTION  
Analyzer  
Configuration  
CFG  
Lists key hardware and software configuration information  
Used to set up and operate the AutoCal feature.  
6.5  
7.6  
Auto Cal Feature  
ACAL  
Only appears if the analyzer has one of the internal valve  
options installed  
Internal Data  
Acquisition (DAS)  
DAS  
Used to set up the DAS system and view recorded data  
6.7  
6.8  
Analog Output  
Reporting Range  
Configuration  
Used to configure the output signals generated by the  
instruments Analog outputs.  
RNGE  
Calibration  
Password Security  
PASS  
CLK  
Turns the calibration password feature ON/OFF  
Used to Set or adjust the instrument’s internal clock  
6.9  
Internal Clock  
Configuration  
6.10  
Advanced SETUP  
See  
Table 6-5  
MORE  
This button accesses the instruments secondary setup menu  
Features  
Table 6-5: Secondary Setup Mode Features and Functions  
TOUCHSCREEN  
MANUAL  
SECTION  
MODE OR FEATURE  
DESCRIPTION  
BUTTON  
Used to set up and operate the analyzer’s various  
external I/O channels including RS-232; RS-485,  
modem communication and/or Ethernet access.  
External Communication  
Channel Configuration  
6.11 &  
6.15  
COMM  
Used to view various variables related to the  
instruments current operational status  
System Status Variables  
System Diagnostic Features  
CO2 Concentration Alarms  
VARS  
DIAG  
ALRM  
6.12  
6.13  
6.14  
Used to access a variety of functions that are used to  
configure, test or diagnose problems with a variety of  
the analyzer’s basic systems  
Used to activate the analyzer’s two gas concentration  
status alarms and set the alarm limits  
NOTE  
Any changes made to a variable during one of the following procedures is not  
acknowledged by the instrument until the ENTR button is pressed  
If EXIT is pressed before the ENTR button, the analyzer will beep alerting the user  
that the newly entered value has been lost.  
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6.5. SETUP CFG: Viewing the Analyzer’s Configuration  
Information  
Pressing the CFG button displays the instrument configuration information. This display lists the analyzer  
model, serial number, firmware revision, software library revision, CPU type and other information. Use  
this information to identify the software and hardware when contacting customer service. Special  
instrument or software features or installed options may also be listed here.  
SAMPLE*  
RANGE = 500.000 PPB  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
Press NEXT and PREV to scroll through the  
following list of Configuration information:  
MODEL NAME  
PART NUMBER  
SAMPLE  
PRIMARY SETUP MENU  
Press EXIT at any  
time to return to the  
SAMPLE display  
SERIAL NUMBER  
SOFTWARE REVISION  
LIBRARY REVISION  
iCHIP SOFTWARE REVISION1  
HESSEN PROTOCOL REVISION1  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
ACTIVE SPECIAL SOFTWARE  
OPTIONS1  
SAMPLE  
T360 CO2 ANALYZER  
Press EXIT at  
any time to  
return to SETUP  
menu  
CPU TYPE  
DATE FACTORY CONFIGURATION  
SAVED  
NEXT PREV  
1Only appears if relevant option of Feature is active.  
6.6. SETUP ACAL: Automatic Calibration  
Instruments with one of the internal valve options installed can be set to automatically run calibration  
procedures and calibration checks. These automatic procedures are programmed using the submenus  
and functions found under the ACAL menu.  
A menu tree showing the ACAL menu’s entire structure can be found in Appendix A-1 of this manual.  
Instructions for using the ACAL feature are located in the Section 7.6 of this manual along with all other  
information related to calibrating the analyzer.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7. SETUP DAS: Using the Data Acquisition System (DAS)  
The GFC 7000TA analyzer contains a flexible and powerful, internal data acquisition system (DAS) that  
enables the analyzer to store concentration and calibration data as well as a host of diagnostic  
parameters. The DAS of the GFC 7000TA can store up to about one million data points, which can,  
depending on individual configurations, cover days, weeks or months of valuable measurements. The  
data are stored in non-volatile memory and are retained even when the instrument is powered off. Data  
are stored in plain text format for easy retrieval and use in common data analysis programs (such as  
spreadsheet-type programs).  
The DAS is designed to be flexible, users have full control over the type, length and reporting time of the  
data. The DAS permits users to access stored data through the instrument’s front panel or its  
communication ports. Using APICOM, data can even be retrieved automatically to a remote computer for  
further processing.  
The principal use of the DAS is logging data for trend analysis and predictive diagnostics, which can  
assist in identifying possible problems before they affect the functionality of the analyzer. The secondary  
use is for data analysis, documentation and archival in electronic format.  
To support the DAS functionality, Teledyne Instruments offers APICOM, a program that provides a visual  
interface for remote or local setup, configuration and data retrieval of the DAS (Section 6.7). The  
APICOM manual, which is included with the program, contains a more detailed description of the DAS  
structure and configuration.  
The GFC 7000TA is configured with a basic DAS configuration, which is enabled by default. New data  
channels are also enabled by default but each channel may be turned off for later or occasional use.  
Note that DAS operation is suspended while its configuration is edited through the front panel. To  
prevent such data loss, it is recommended to use the APICOM graphical user interface for DAS changes.  
The green SAMPLE LED on the instrument front panel, which indicates the analyzer status, also indicates  
certain aspects of the DAS status:  
Table 6-6: Front Panel Sample LED Status Indicators for DAS  
LED STATE  
OFF  
DAS Status  
System is in calibration mode. Data logging can be enabled or disabled for this mode.  
Calibration data are typically stored at the end of calibration periods, concentration data are  
typically not sampled, diagnostic data should be collected.  
BLINKING  
ON  
Instrument is in hold-off mode, a short period after the system exits calibrations. IDAS  
channels can be enabled or disabled for this period. Concentration data are typically disabled  
whereas diagnostic should be collected.  
Sampling normally.  
The DAS can be disabled only by disabling or deleting its individual data channels.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.1. DAS Structure  
The DAS is designed around the feature of a “record”. A record is a single data point of one parameter,  
stored in one (or more) data channels and generated by one of several triggering event. The entire DAS  
configuration is stored in a script, which can be edited from the front panel or downloaded, edited and  
uploaded to the instrument in form of a string of plain-text lines through the communication ports.  
DAS data are defined by the PARAMETER type and are stored through different triggering EVENTS in  
data CHANNELS, which relate triggering events to data parameters and define certain operational  
functions related to the recording and reporting of the data.  
6.7.1.1. DAS Channels  
The key to the flexibility of the DAS is its ability to store a large number of combinations of triggering  
events and data parameters in the form of data channels. Users may create up to 20 data channels and  
each channel can contain one or more parameters. For each channel one triggering event is selected  
and up to 50 data parameters, which can be the same or different between channels. Each data channel  
has several properties that define the structure of the channel and allow the user to make operational  
decisions regarding the channel (Table 6-7).  
Table 6-7: DAS Data Channel Properties  
PROPERTY  
NAME  
DESCRIPTION  
DEFAULT  
“NONE”  
SETTING RANGE  
The name of the data channel.  
Up to 6 letters and digits  
(more with APICOM, but  
only the first six are  
displayed on the front  
panel).  
TRIGGERING  
EVENT  
The event that triggers the data channel to measure  
and store its data parameters. See APPENDIX A-5  
for a list of available triggering events.  
ATIMER  
See Appendix A-5 For a  
complete list.  
NUMBER &  
PARAMETER  
LIST  
A user-configurable list of data types to be recorded  
in any given channel. See APPENDIX A-5 for a list  
of available parameters  
1 – DETMES  
See Appendix A-5 For a  
complete list.  
STARTING  
DATE  
The starting date when a channel starts collecting  
data  
01-JAN-03  
000:01:00  
Any actual date in the past  
or future.  
SAMPLE  
PERIOD  
The amount of time between each data point that is  
averaged into one mean reported every REPORT  
PERIOD.  
000:00:01 to 366:23:59  
(Days:Hours:Minutes)  
REPORT  
PERIOD  
The amount of time between each channel data  
point.  
000:01:00  
100  
000:00:01 to  
366:23:59  
(Days:Hours:Minutes)  
NUMBER OF  
RECORDS  
The number of reports that will be stored in the data  
file. Once the specified limit has been exceeded,  
the oldest data are over-written to make space for  
new data.  
1 to 1 million, limited by  
available storage space.  
RS-232  
REPORT  
Enables the analyzer to automatically report channel  
values to the RS-232 ports.  
OFF  
ON  
OFF or ON  
OFF or ON  
CHANNEL  
ENABLED  
Enables or disables the channel. Provides a  
convenient means to temporarily disable a data  
channel.  
CAL HOLD OFF Disables sampling of data parameters while  
OFF  
OFF or ON  
instrument is in calibration mode.  
(Section 6.7.2.11.)  
When enabled here – there is also a length of the  
DAS HOLD OFF after calibration mode, which is set  
in the VARS menu.  
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Operating Instructions  
6.7.1.2. DAS Parameters  
Model GFC7000TA Carbon Dioxide Analyzer  
Data parameters are types of data that may be measured and stored by the DAS. For each Teledyne  
Instruments analyzer model, the list of available data parameters is different, fully defined and not  
customizable. Appendix A-5 lists firmware specific data parameters for the analyzer. DAS parameters  
include things like CO2 concentration measurements, temperatures of the various heaters placed around  
the analyzer, pressures and flows of the pneumatic subsystem and other diagnostic measurements as  
well as calibration data such as slope and offset.  
Most data parameters have associated measurement units, such as mV, ppb, cm³/min, etc., although  
some parameters have no units. With the exception of concentration readings, none of these units of  
measure can be changed. To change the units of measure for concentration readings See Section 6.8.6.  
Note  
DAS does not keep track of the unit of each concentration value and DAS data files  
may contain concentrations in multiple units if the unit was changed during data  
acquisition.  
Each data parameter has user-configurable functions that define how the data are recorded:  
Table 6-8: DAS Data Parameter Functions  
FUNCTION  
PARAMETER  
SAMPLE MODE  
EFFECT  
Instrument-specific parameter name.  
INST: Records instantaneous reading.  
AVG: Records average reading during reporting interval.  
MIN: Records minimum (instantaneous) reading during reporting interval.  
MAX: Records maximum (instantaneous) reading during reporting interval.  
SDEV: Records the standard deviation of the data points recorded during the reporting interval.  
Decimal precision of parameter value (0-4).  
PRECISION  
STORE NUM.  
SAMPLES  
OFF: stores only the average (default).  
ON: stores the average and the number of samples in each average for a parameter. This  
property is only useful when the AVG sample mode is used. Note that the number of samples  
is the same for all parameters in one channel and needs to be specified only for one of the  
parameters in that channel.  
Users can specify up to 50 parameters per data channel (the GFC 7000TA provides about 30  
parameters). However, the number of parameters and channels is ultimately limited by available  
memory.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.1.3. DAS Triggering Events  
Triggering events define when and how the DAS records a measurement of any given data channel.  
Triggering events are firmware-specific and a complete list of Triggers for this model analyzer can be  
found in Appendix A-5. The most commonly used triggering events are:  
ATIMER: Sampling at regular intervals specified by an automatic timer. Most trending  
information is usually stored at such regular intervals, which can be instantaneous or  
averaged.  
EXITZR, EXITSP, SLPCHG (exit zero, exit span, slope change): Sampling at the end of  
(irregularly occurring) calibrations or when the response slope changes. These triggering  
events create instantaneous data points, e.g., for the new slope and offset (concentration  
response) values at the end of a calibration. Zero and slope values are valuable to  
monitor response drift and to document when the instrument was calibrated.  
WARNINGS: Some data may be useful when stored if one of several warning messages  
appears such as WTEMPW (GFC wheel temperature warning) or PPRESW (purge  
pressure warning). This is helpful for trouble-shooting by monitoring when a particular  
warning occurred.  
6.7.2. Default DAS Channels  
A set of default Data Channels has been included in the analyzer’s software for logging CO2  
concentration and certain predictive diagnostic data. These default channels include but are not limited  
to:  
CONC: Samples CO2 concentration at one minute intervals and stores an average every hour with a time  
and date stamp. Readings during calibration and calibration hold off are not included in the data. By  
default, the last 800 hourly averages are stored.  
PNUMTC: Collects sample flow and sample pressure data at five minute intervals and stores an average  
once a day with a time and date stamp. This data is useful for monitoring the condition of the pump and  
critical flow orifice (sample flow) and the sample filter (clogging indicated by a drop in sample pressure)  
over time to predict when maintenance will be required. The last 360 daily averages (about 1 year) are  
stored.  
CALDAT: Logs new slope and offset every time a zero or span calibration is performed. This Data  
Channel also records the instrument readings just prior to performing a calibration. This information is  
useful for performing predictive diagnostics as part of a regular maintenance schedule (See Section 9.1).  
STBZRO: Logs the concentration stability, the electronic output of the IR detector of the most recent  
measure phase and the measure/reference ratio every time the instrument exits the zero calibration  
mode. Data from the last 200 zero calibrations is stored. A time and date stamp is recorded for every  
data point logged. This information is useful for performing predictive diagnostics as part of a regular  
maintenance schedule (See Section 9.1).  
STBSPN: Logs the electronic output of the IR detector of the most recent measure phase and the  
measure/reference ratio every time the instrument exits span calibration mode. Data from the last 200  
zero calibrations is stored. A time and date stamp is recorded for every data point logged. This  
information is useful for performing predictive diagnostics as part of a regular maintenance schedule (See  
Section 9.1).  
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Model GFC7000TA Carbon Dioxide Analyzer  
TEMP: Samples the analyzer’s bench temperature, box temperature and PHT cooler drive voltage every  
five minutes and records an average once every six hours. Data from the last 400 averaging periods is  
recorded. A time and date stamp is recorded for every data point logged. This information is useful for  
performing predictive diagnostics as part of a regular maintenance schedule (See Section 9.1).  
Note  
The CALDAT, STBZRO and STBSPN channels collect data based on events (e.g. a  
calibration operation) rather than a timed interval. This does not represent any  
specific length of time since it is dependent on how often calibrations are  
performed.  
Triggering Events and Data Parameters/Functions for these default channels are:  
LIST OF CHANNELS  
LIST OF PARAMETERS  
LIST OF PARAMETERS  
NAME: CONC  
EVENT: ATIMER  
PARAMETER: CONC1  
MODE: AVG  
PRECISION: 1  
REPORT PERIOD: 000:01:00  
NO. OF RECORDS: 800  
RS-232 REPORT: OFF  
CHANNEL ENABLED: ON  
CAL HOLD OFF: ON  
STORE NUM SAMPLES OFF  
PARAMETER: SMPLFLW  
MODE: AVG  
NAME: PNUMTC  
EVENT: ATIMER  
PRECISION: 1  
STORE NUM SAMPLES OFF  
REPORT PERIOD: 001:00:00  
NO. OF RECORDS: 360  
RS-232 REPORT: OFF  
CHANNEL ENABLED: ON  
CAL HOLD OFF: OFF  
PARAMETER: SMPLPRS  
MODE: AVG  
PARAMETER: SLOPE1  
MODE: INST  
PRECISION:3  
PRECISION: 1  
STORE NUM SAMPLES OFF  
STORE NUM SAMPLES OFF  
NAME: CALDAT  
EVENT: SLPCHG  
PARAMETER: OFSET1  
MODE: INST  
PRECISION: 1  
REPORT PERIOD: N/A  
NO. OF RECORDS:200  
RS-232 REPORT: OFF  
CHANNEL ENABLED: ON  
CAL HOLD OFF: OFF  
STORE NUM SAMPLES OFF  
PARAMETER: STABIL  
MODE: INST  
PARAMETER: ZSCNC1  
MODE: INST  
PRECISION:2  
STORE NUM SAMPLES OFF  
PRECISION: 1  
STORE NUM SAMPLES OFF  
NAME: STBZRO  
EVENT: EXITZR  
PARAMETER: DETMES  
MODE: INST  
PRECISION: 1  
STORE NUM SAMPLES OFF  
REPORT PERIOD: N/A  
NO. OF RECORDS:200  
RS-232 REPORT: OFF  
CHANNEL ENABLED: ON  
CAL HOLD OFF: OFF  
PARAMETER: DETMES  
MODE: INST  
PRECISION: 1  
PARAMETER: RATIO  
MODE: INST  
PRECISION: 3  
STORE NUM SAMPLES OFF  
NAME: STBSPN  
EVENT: EXITSP  
STORE NUM SAMPLES OFF  
REPORT PERIOD: N/A  
NO. OF RECORDS:200  
RS-232 REPORT: OFF  
CHANNEL ENABLED: ON  
CAL HOLD OFF: OFF  
PARAMETER: RATIO  
MODE: INST  
PRECISION: 3  
STORE NUM SAMPLES OFF  
PARAMETER: BNTEMP  
MODE: AVG  
PRECISION:1  
STORE NUM SAMPLES OFF  
NAME: TEMP  
EVENT: ATIMER  
PARAMETER: BOXTMP  
MODE: AVG  
PRECISION: 1  
STORE NUM SAMPLES OFF  
REPORT PERIOD: 000:06:00  
NO. OF RECORDS:400  
RS-232 REPORT: OFF  
CHANNEL ENABLED: ON  
CAL HOLD OFF: OFF  
PARAMETER: PHTDRV  
MODE: AVG  
PRECISION: 1  
STORE NUM SAMPLES OFF  
Figure 6-4:  
Default DAS Channels Setup  
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Model GFC7000TA Carbon Dioxide Analyzer  
These default Data Channels can be used as they are, or they can be customized from the front panel to  
fit a specific application. They can also be deleted to make room for custom user-programmed Data  
Channels.  
Appendix A-5 lists the firmware-specific DAS configuration in plain-text format. This text file can either be  
loaded into APICOM and then modified and uploaded to the instrument or can be copied and pasted into  
a terminal program to be sent to the analyzer.  
NOTE  
Sending an DAS configuration to the analyzer through its COM ports will replace  
the existing configuration and will delete all stored data. Back up any existing  
data and the DAS configuration before uploading new settings.  
These default Data Channels can be used as they are, or they can be customized from the front panel to  
fit a specific application. They can also be deleted to make room for custom user-programmed Data  
Channels.  
Appendix A-5 lists the firmware-specific DAS configuration in plain-text format. This text file can either be  
loaded into APICOM and then modified and uploaded to the instrument or can be copied and pasted into  
a terminal program to be sent to the analyzer.  
NOTE  
Sending an DAS configuration to the analyzer through its COM ports will replace  
the existing configuration and will delete all stored data. Back up any existing  
data and the DAS configuration before uploading new settings.  
6.7.2.1. DAS Configuration Limits  
The number of DAS objects are limited by the instrument’s finite storage capacity. For information  
regarding the maximum number of channels, parameters, and records and how to calculate the file size  
for each data channel, refer to the DAS manual downloadable from the TAI website at  
http://www.teledyne-api.com/manuals/.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.2. Viewing DAS Data and Settings  
DAS data and settings can be viewed on the front panel through the following touchscreen buttons  
sequence.  
TOUCHSCREEN BUTTON FUNCTIONS  
BUTTON  
FUNCTION  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
<PRM  
PRM>  
Moves to the next Parameter  
Moves to the previous  
Parameter  
SETUP X.X  
PRIMARY SETUP MENU  
NX10  
NEXT  
PREV  
PV10  
Moves the view forward 10  
data points/channels  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
Moves to the next data  
point/channel  
Moves to the previous data  
point/channel  
SETUP X.X  
DATA ACQUISITION  
Moves the view back 10 data  
points/channels  
VIEW EDIT  
Buttons only appear when applicable.  
SETUP X.X  
CONC : DATA AVAILABLE  
NEXT VIEW  
EXIT  
SETUP X.X  
00:00:00 NXCNC1=0.0 PPM  
PV10 PREV NEXT NX10 <PRM PRM>  
EXIT  
SETUP X.X  
PNUMTC: DATA AVAILABLE  
PREV NEXT VIEW  
EXIT  
SETUP X.X  
00:00:00 SMPFLW=000.0 cc / m  
<PRM  
PRM>  
EXIT  
SETUP X.X  
CALDAT: DATA AVAILABLE  
PREV NEXT VIEW  
EXIT  
SETUP X.X  
00:00:00 NXSLP1=0.000  
<PRM PRM>  
PV10 PREV  
EXIT  
SETUP X.X  
STBZRO: DATA AVAILABLE  
PREV NEXT VIEW  
EXIT  
SETUP X.X  
00:00:00 STABIL=0.000  
<PRM PRM>  
PV10 PREV  
EXIT  
EXIT  
EXIT  
SETUP X.X  
STBSPN: DATA AVAILABLE  
PREV NEXT VIEW  
EXIT  
SETUP X.X  
00:00:00 DETMES=0.000  
<PRM PRM>  
PV10 PREV  
SETUP X.X  
TEMP: DATA AVAILABLE  
PREV NEXT VIEW  
EXIT  
SETUP X.X  
00:00:00 BOXTMP=0.000  
<PRM PRM>  
PV10 PREV  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.3. Editing DAS Data Channels  
DAS configuration is most conveniently done through the APICOM remote control program. The  
following list of key strokes shows how to edit using the front panel.  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
EXIT will return to the  
previous SAMPLE  
display.  
CFG DAS RNGE PASS CLK MORE  
EXIT  
Main Data Acquisition Menu  
SETUP X.X  
DATA ACQUISITION  
VIEW EDIT  
EXIT  
SAMPLE  
ENTER SETUP PASS : 818  
8
8
1
ENTR EXIT  
Edit Data Channel Menu  
Moves the  
display up &  
down the list of  
Data Channels  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the Main  
Data Acquisition  
Menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
Exports the  
Inserts a new Data  
Channel into the list  
BEFORE the Channel  
configuration of all  
data channels to  
RS-232 interface.  
currently being displayed  
Deletes The Data  
Channel currently  
being displayed  
Moves the display  
between the  
SETUP X.X  
NAME:CONC  
Exits returns to the  
previous Menu  
PROPERTIES for this  
data channel.  
<SET SET> EDIT PRNT  
EXIT  
Reports the configuration of current  
data channels to the RS-232 ports.  
Allows to edit the channel name, see next key sequence.  
When editing the data channels, the top line of the display indicates some of the configuration  
parameters. For example, the display line:  
0) CONC: ATIMER, 4, 800  
translates to the following configuration:  
Channel No.: 0  
NAME: CONC  
TRIGGER EVENT: ATIMER  
PARAMETERS: Four parameters are included in this channel  
EVENT: This channel is set up to record 800 data points.  
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Model GFC7000TA Carbon Dioxide Analyzer  
To edit the name of a data channel, follow the above touchscreen button sequence and then press:  
From the end of the previous button sequence …  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
SETUP X.X  
NAME:CONC  
ENTR accepts the new string  
and returns to the previous  
menu.  
C
O
N
C
-
-
ENTR  
EXIT  
EXIT ignores the new string  
and returns to the previous  
menu.  
Press each button repeatedly to cycle through  
the available character set:  
0-9, A-Z, space ’ ~ ! # $ % ^ & * ( ) - _ = +[ ]  
{ } < >\ | ; : , . / ?  
6.7.2.4. Trigger Events  
To edit the list of data parameters associated with a specific data channel, press:  
From the DATA ACQUISITION menu  
(see Section 6.7.2.2)  
Edit Data Channel Menu  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the Main  
Data Acquisition  
menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
SETUP X.X  
EVENT:ATIMER  
<SET SET> EDIT PRINT  
EXIT  
ENTR accepts the new string  
and returns to the previous  
menu.  
EXIT ignores the new string  
and returns to the previous  
menu.  
SETUP X.X  
EVENT:ATIMER  
<PREV NEXT>  
ENTR  
EXIT  
Press each button repeatedly to cycle through  
the list of available trigger events.  
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6.7.2.5. Editing DAS Parameters  
Data channels can be edited individually from the front panel without affecting other data channels.  
However, when editing a data channel, such as during adding, deleting or editing parameters, all data for  
that particular channel will be lost, because the DAS can store only data of one format (number of  
parameter columns etc.) for any given channel. In addition, an DAS configuration can only be uploaded  
remotely as an entire set of channels. Hence, remote update of the DAS will always delete all current  
channels and stored data.  
To modify, add or delete a parameter, follow the instruction shown in Section 6.7.2.2 then press:  
From the DATA ACQUISITION menu  
(see Section 6.7.2.2)  
Edit Data Channel Menu  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the main  
Data Acquisition  
menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
Press SET> button until…  
SETUP X.X  
PARAMETERS:1  
<SET SET> EDIT PRINT  
EXIT  
SETUP X.X  
EDIT PARAMS (DELETE DATA)  
YES will delete  
all data in that  
entire channel.  
NO returns to  
the previous  
menu and  
YES NO  
retains all data.  
Edit Data Parameter Menu  
Moves the  
display between  
existing  
SETUP X.X 0) PARAM=CONC1, MODE=AVG  
PREV NEXT INS DEL EDIT  
Exits to the main  
Data Acquisition  
menu  
EXIT  
Parameters  
Inserts a new Parameter  
before the currently  
displayed Parameter  
Use to configure  
the functions for  
this Parameter.  
Deletes the Parameter  
currently displayed.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
To configure a specific data parameter, press:  
FROM THE EDIT DATA PARAMETER MENU  
(see previous section)  
SETUP X.X 0) PARAM=CONC1, MODE=AVG  
PREV NEXT  
INS DEL EDIT  
EXIT  
SETUP X.X PARAMETERS:CONC1  
SET> EDIT  
EXIT  
SETUP X.X PARAMETERS: 1  
PREV NEXT  
ENTR  
EXIT  
If more than on parameter is active for  
this channel, these cycle through list of  
existing Parameters.  
SETUP X.X SAMPLE MODE:AVG  
<SET SET> EDIT  
EXIT  
SETUP X.X SAMPLE MODE: INST  
INST AVG MIN MAX  
EXIT  
Press the button for the desired mode  
ENTR accepts the new  
setting and returns to the  
previous menu.  
SETUP X.X PRECISION: 1  
EXIT ignores the new setting  
and returns to the previous  
<SET SET> EDIT  
EXIT  
SETUP X.X PRECISION: 1  
1
EXIT  
Set for 0-4  
<SET Returns to  
previous  
SETUP X.X STORE NUM. SAMPLES: OFF  
Functions  
<SET  
EDIT  
EXIT  
SETUP X.X STORE NUM. SAMPLES: OFF  
OFF  
ENTR EXIT  
Turn ON or OFF  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.6. Sample Period and Report Period  
The DAS defines two principal time periods by which sample readings are taken and permanently  
recorded:  
SAMPLE PERIOD: Determines how often DAS temporarily records a sample reading of the  
parameter in volatile memory. The SAMPLE PERIOD is set to one minute by default and generally  
cannot be accessed from the standard DAS front panel menu, but is available via the instruments  
communication ports by using APICOM or the analyzer’s standard serial data protocol.  
SAMPLE PERIOD is only used when the DAS parameter’s sample mode is set for AVG, MIN or  
MAX.  
REPORT PERIOD: Sets how often the sample readings stored in volatile memory are processed,  
(e.g. average, minimum or maximum are calculated) and the results stored permanently in the  
instruments Disk-on-Chip as well as transmitted via the analyzer’s communication ports. The  
REPORT PERIOD may be set from the front panel.  
If the INST sample mode is selected the instrument stores and reports an instantaneous reading  
of the selected parameter at the end of the chosen REPORT PERIOD  
In AVG, MIN or MAX sample modes, the settings for the SAMPLE PERIOD and the REPORT PERIOD  
determine the number of data points used each time the average, minimum or maximum is calculated,  
stored and reported to the com ports. The actual sample readings are not stored past the end of the of  
the chosen REPORT PERIOD.  
Also, the SAMPLE PERIOD and REPORT PERIOD intervals are synchronized to the beginning and end  
of the appropriate interval of the instruments internal clock.  
If SAMPLE PERIOD were set for one minute the first reading would occur at the beginning of the next  
full minute according to the instrument’s internal clock.  
If the REPORT PERIOD were set for of one hour the first report activity would occur at the beginning  
of the next full hour according to the instrument’s internal clock.  
EXAMPLE: Given the above settings, if DAS were activated at 7:57:35 the first sample would  
occur at 7:58 and the first report would be calculated at 8:00 consisting of data points for 7:58.  
7:59 and 8:00.  
During the next hour (from 8:01 to 9:00) the instrument will take a sample reading every minute  
and include 60 sample readings.  
When the STORE NUM. SAMPLES feature is turned on the instrument will also store how many sample  
readings were used for the AVG, MIN or MAX calculation but not the readings themselves.  
REPORT PERIODS IN PROGRESS WHEN INSTRUMENT IS POWERED OFF  
If the instrument is powered off in the middle of a REPORT PERIOD, the samples accumulated so far  
during that period are lost. Once the instrument is turned back on, the DAS restarts taking samples and  
temporarily them in volatile memory as part of the REPORT PERIOD currently active at the time of  
restart. At the end of this REPORT PERIOD only the sample readings taken since the instrument was  
turned back on will be included in any AVG, MIN or MAX calculation. Also, the STORE NUM. SAMPLES  
feature will report the number of sample readings taken since the instrument was restarted.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
To define the REPORT PERIOD, follow the instruction shown in Section 6.7.2.2 then press:  
From the DATA ACQUISITION menu  
(see Section 6.7.2.2)  
Edit Data Channel Menu  
Use the PREV and NEXT  
buttons to scroll to the  
data channel to be edited.  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the main  
Data Acquisition  
menu.  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
Press SET> key until you reach REPORT PERIOD …  
SETUP X.X  
REPORT PERIOD:000:01:00  
<SET SET> EDIT PRINT  
EXIT  
SETUP X.X  
REPORT PERIODD:DAYS:0  
Set the number of days  
between reports (0-366).  
0
0
0
ENTR EXIT  
Press buttons to set hours  
between reports in the format :  
HH:MM (max: 23:59). This is a  
24 hour clock . PM hours are 13  
thru 23, midnight is 00:00.  
SETUP X.X  
REPORT PERIODD:TIME:01:01  
ENTR EXIT  
ENTR accepts the new string and  
returns to the previous menu.  
EXIT ignores the new string and  
returns to the previous menu.  
0
1
0
0
IIf at any time an illegal entry is selected (e.g., days > 366)  
the ENTR button will disappear from the display.  
Example 2:15 PM = 14:15  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.7. Number of Records  
The number of data records in the GFC 7000TA is limited to about a cumulative one million data points in  
all channels (one megabyte of space on the disk-on-chip). However, the actual number of records is also  
limited by the total number of parameters and channels and other settings in the DAS configuration.  
Every additional data channel, parameter, number of samples setting etc. and will reduce the maximum  
amount of data points somewhat. In general, however, the maximum data capacity is divided amongst all  
channels (max: 20) and parameters (max: 50 per channel).  
The DAS will check the amount of available data space and prevent the user from specifying too many  
records at any given point. If, for example, the DAS memory space can accommodate 375 more data  
records, the ENTR key will disappear when trying to specify more than that number of records. This  
check for memory space may also make an upload of an DAS configuration with APICOM or a Terminal  
program fail, if the combined number of records would be exceeded. In this case, it is suggested to either  
try from the front panel what the maximum number of records can be or use trial-and-error in designing  
the DAS script or calculate the number of records using the DAS or APICOM manuals. To set the  
number of records for one channel from the front panel, press SETUP-DAS-EDIT-ENTR and the following  
touchscreen button sequence.  
From the DATA ACQUISITION menu  
(see Section 6.12.2.2)  
Edit Data Channel Menu  
SETUP X.X  
0) CONC: ATIMER, 1 2,  
900  
Exits to the main  
Data Acquisition  
menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
Press SET> key until…  
SETUP X.X  
NUMBER OF RECORDS:000  
<SET SET> EDIT PRINT  
EXIT  
SETUP X.X  
EDIT RECOPRDS (DELET DATA)  
NO returns to the  
previous menu.  
YES will delete all data  
in this channel.  
YES  
NO  
ENTR accepts the new  
setting and returns to the  
previous menu.  
EXIT ignores the new setting  
and returns to the previous  
menu.  
Toggle buttons to set  
number of records  
(1-99999)  
SETUP X.X  
REPORT PERIODD:DAYS:0  
ENTR EXIT  
0
0
0
0
0
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.8. RS-232 Report Function  
The GFC 7000TA DAS can automatically report data to the communications ports, where they can be  
captured with a terminal emulation program or simply viewed by the user.  
To enable automatic COM port reporting, follow the instruction shown in Section 6.7.2.2 then press:  
From the DATA ACQUISITION menu  
(see Section 6.7.2.2)  
Edit Data Channel Menu  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the main  
Data Acquisition  
menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
Press SET> key until…  
SETUP X.X  
RS-232 REPORT: OFF  
<SET SET> EDIT PRINT  
EXIT  
ENTR accepts the new  
setting and returns to the  
previous menu.  
EXIT ignores the new setting  
and returns to the previous  
menu.  
SETUP X.X  
RS-232 REPORT: OFF  
Toggle to turn  
reporting ON or OFF  
OFF  
ENTR EXIT  
6.7.2.9. Compact Report  
When enabled, this option avoids unnecessary line breaks on all RS-232 reports. Instead of reporting  
each parameter in one channel on a separate line, up to five parameters are reported in one line.  
6.7.2.10. Starting Date  
This option allows to specify a starting date for any given channel in case the user wants to start data  
acquisition only after a certain time and date. If the Starting Date is in the past, the DAS ignores this  
setting.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.11. Disabling/Enabling Data Channels  
Data channels can be temporarily disabled, which can reduce the read/write wear on the disk-on-chip.  
The ALL_01 channel of the GFC 7000TA, for example, is disabled by default.  
To disable a data channel, follow the instruction shown in Section 6.7.2.2 then press:  
From the DATA ACQUISITION menu  
(see Section 6.7.2.2)  
Edit Data Channel Menu  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the main  
Data Acquisition  
menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
Press SET> key until…  
SETUP X.X  
CHANNEL ENABLE:ON  
<SET SET> EDIT PRINT  
EXIT  
ENTR accepts the new  
setting and returns to the  
previous menu.  
EXIT ignores the new setting  
and returns to the previous  
menu.  
SETUP X.X  
CHANNEL ENABLE:ON  
Toggle to turn  
channel ON or OFF  
OFF  
ENTR EXIT  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.2.12. HOLDOFF Feature  
The DAS HOLDOFF feature allows to prevent data collection during calibrations and during the  
DAS_HOLDOFF period enabled and specified in the VARS (Section 6.12). To enable or disable the  
HOLDOFF, follow the instruction shown in Section 6.7.2.2 then press:  
From the DATA ACQUISITION menu  
(see Section 6.7.2.2)  
Edit Data Channel Menu  
SETUP X.X  
0) CONC: ATIMER, 1,  
900  
Exits to the main  
Data Acquisition  
menu  
PREV NEXT  
INS DEL EDIT PRNT EXIT  
SETUP X.X  
NAME:CONC  
<SET SET> EDIT PRINT  
EXIT  
Press SET> key until…  
SETUP X.X  
CAL HOLD OFF:ON  
SET> EDIT PRINT  
EXIT  
ENTR accepts the new  
setting and returns to the  
previous menu.  
EXIT ignores the new setting  
and returns to the previous  
menu.  
SETUP X.X  
CAL HOLD OFF:ON  
Toggle to turn HOLDOFF  
ON or OFF  
ON  
ENTR EXIT  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.7.3. Remote DAS Configuration  
Editing channels, parameters and triggering events as described in this can be performed via the  
APICOM remote control program using the graphic interface shown in Figure 6-5. Refer to Section 6.15  
for details on remote access to the GFC 7000TA analyzer.  
Figure 6-5:  
APICOM User Interface for DAS Configuration  
Once a DAS configuration is edited (which can be done offline and without interrupting DAS data  
collection), it is conveniently uploaded to the instrument and can be stored on a computer for later review,  
alteration or documentation and archival. Refer to the APICOM manual for details on these procedures.  
The APICOM user manual (Teledyne Instruments part number 039450000) is included in the APICOM  
installation file, which can be downloaded at http://www.teledyne-api.com/software/apicom/. It is  
recommended that you start by downloading the default DAS configuration, getting familiar with its  
command structure and syntax conventions, and then altering a copy of the original file offline before  
uploading the new configuration.  
CAUTION  
Whereas the editing, adding and deleting of DAS channels and parameters of one  
channel through the front-panel touchscreen can be done without affecting the  
other channels, uploading an DAS configuration script to the analyzer through its  
communication ports will erase all data, parameters and channels by replacing  
them with the new DAS configuration. Backup of data and the original DAS  
configuration is advised before attempting any DAS changes.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.8. SETUP RNGE: Analog Output Reporting Range  
Configuration  
The analyzer has three active analog output signals, accessible through a connector on the rear panel.  
ANALOG OUT  
CO2 concentration  
Test Channel  
outputs  
Not Used  
A1  
A2  
A3  
A4  
+
-
+
-
+
-
+
-
LOW range when DUAL  
HIGH range when DUAL  
mode is selected  
mode is selected  
Figure 6-6:  
Analog Output Connector Pin Out  
All three outputs can be configured either at the factory or by the user for full scale outputs of 0.1 VDC,  
1VDC, 5VDC or 10VDC. Additionally A1 and A2 may be equipped with optional 0-20 mADC current loop  
drivers and configured for any current output within that range (e.g. 0-20, 2-20, 4-20, etc.). The user may  
also adjust the signal level and scaling of the actual output voltage or current to match the input  
requirements of the recorder or data logger (See Section 6.13.4).  
The A1 and A2 channels output a signal that is proportional to the CO2 concentration of the sample gas.  
Several modes are available which allow them to operate independently or be slaved together (See  
Section 6.7). The user may also select between a variety of reporting range spans (See Sections 6.8.3,  
6.8.4 and 6.8.5).  
EXAMPLE:  
A1 OUTPUT: Output Signal = 0-5 VDC representing 0-1000 ppm concentration values  
A2 OUTPUT: Output Signal = 0 – 10 VDC representing 0-500 ppm concentration values.  
Output A3 is only active if the O2 sensor option is installed. In this case a signal representing the  
currently measured O2 concentration is output on this channel.  
The output, labeled A4 is special. It can be set by the user (See Section 6.13.9) to output several of the  
test functions accessible through the <TST TST> keys of the units sample display.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.8.1. Physical Range versus Analog Output Reporting Ranges  
Functionally, the Gas Filter Correlation CO2 Analyzer has one hardware Physical Range that is capable of  
determining CO2 concentrations between 50 ppm and 2,000 ppm. This architecture improves reliability  
and accuracy by avoiding the need for extra, switchable, gain-amplification circuitry. Once properly  
calibrated, the analyzer’s front panel will accurately report concentrations along the entire span of its 50  
ppm and 2,000 ppm physical range.  
Because, most applications use only a small part of the analyzer’s physical range, the width of the Model  
GFC 7000TA’s physical range can create data resolution problems for most analog recording devices.  
For example, in an application where the expected concentration of CO2 is typically less than 500 ppm,  
the full scale of expected values is only 25% of the instrument’s 2,000 ppm physical range. Unmodified,  
the corresponding output signal would also be recorded across only 25% of the range of the recording  
device.  
The GFC 7000TA solves this problem by allowing the user to select a scaled reporting range for the  
analog outputs that only includes that portion of the physical range relevant to the specific application.  
Only the reporting range of the analog outputs is scaled, the physical range of the analyzer and the  
readings displayed on the front panel remain unaltered.  
6.8.2. Reporting Range Modes  
The GFC 7000TA provides three analog output range modes to choose from.  
Single range (SNGL) mode sets a single maximum range for the analog output. If single range is  
selected (See Section 6.78.3) both outputs are slaved together and will represent the same  
measurement span (e.g. 0-50 ppm), however their electronic signal levels may be configured for  
different ranges (e.g. 0-10 VDC vs. 0-.1 VDC – See Section 6.9.4.1).  
Dual range (DUAL) allows the A1 and A2 outputs to be configured with different measurement  
spans (See Section 6.8.4) as well as separate electronic signal levels (See Section 6.9.4.1).  
Auto range (AUTO) mode gives the analyzer to ability to output data via a low range and high range.  
When this mode is selected (See Section 6.8.5) the GFC 7000TA will automatically switch between  
the two ranges dynamically as the concentration value fluctuates.  
Range status is also output via the external digital I/O status outputs (See Section 6.15.1.1).  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
To select the Analog Output Range Type press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SAMPLE  
ENTER SETUP PASS : 818  
8
1
8
ENTR EXIT  
SETUP X.X  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X  
RANGE CONTROL MENU  
MODE SET UNIT  
SETUP X.X  
RANGE MODE: SNGL  
EXIT Returns  
to the Main  
SNGL DUAL AUTO  
ENTR EXIT  
SAMPLE Display  
Only one of the  
range modes may  
be active at any  
time.  
Go To  
Section  
6.7.3  
Go To  
Section  
6.7.4  
Go To  
Section  
6.7.5  
NOTE  
Upper span limit setting for the individual range modes are shared. Resetting the  
span limit in one mode also resets the span limit for the corresponding range in  
the other modes as follows:  
SNGL  
DUAL  
AUTO  
Range  
 Range1  Low Range  
Range2  High Range  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.8.3. Single Range Mode (SNGL)  
This is the default reporting range mode for the analyzer. In single range mode both A1 and A2 are set to  
the same reporting range. This reporting range can be any value between 50 ppm and 2 000 ppm.  
While the two outputs always have the same reporting range, the span, signal offset and scaling of their  
electronic signals may be configured for differently (e.g., A1 = 0-10 V; A2 = 0-0.1 V). See Section 6.13.4  
for instructions on adjusting these parameters.  
To select SNGL range mode and to set the upper limit of the range, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 X.XXX  
SETUP C.3  
RANGE MODE: SNGL  
< TST TST > CAL  
SETUP  
SNGL DUAL AUTO  
ENTR EXIT  
SETUP C.3  
RANGE CONTROL MENU  
SETUP C.3  
PRIMARY SETUP MENU  
MODE SET UNIT  
EXIT  
CFG DAS RNGE PASS CLK MORE  
EXIT  
SETUP C.3  
RANGE CONTROL MENU  
SETUP C.3  
RANGE: 500.0 Conc  
.0  
MODE SET UNIT  
EXIT  
0
0
5
0
0
ENTR EXIT  
SETUP C.3  
RANGE MODE: SNGL  
SETUP C.3  
MODE SET UNIT  
RANGE CONTROL MENU  
EXIT x 2 returns  
to the main  
SAMPLE display  
SNGL DUAL AUTO  
ENTR EXIT  
EXIT  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.8.4. Dual Range Mode (DUAL)  
Selecting Dual Range mode allows the A1 and A2 outputs to be configured with different reporting  
ranges. The analyzer software calls these two ranges low and high. The low range setting corresponds  
with the analog output labeled A1 on the Rear Panel of the instrument. The high Range Setting  
corresponds with the A2 output. While the software names these two ranges low and high, they do not  
have to be configured that way. For example: The low range can be set for a span of 0-1000 ppm while  
the high range is set for 0-500 ppm.  
In DUAL range mode the RANGE test function displayed on the front panel will be replaced by two  
separate functions:  
RANGE1: The range setting for the A1 output.  
RANGE2: The range setting for the A2 output.  
To set the ranges press following keystroke sequence  
.
SETUP X.X  
RANGE MODE: DUAL  
SNGL DUAL AUTO  
ENTR EXIT  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP X.X  
RANGE CONTROL MENU  
< TST TST > CAL  
SETUP  
MODE SET UNIT  
EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
SETUP X.X  
LOW RANGE: 500.0 Conc  
Toggle the  
numeral buttons  
to set the upper  
limit of each  
range.  
CFG DAS RNGE PASS CLK MORE  
EXIT  
0
0
1
5
0
0
.0  
ENTR EXIT  
SETUP X.X  
RANGE CONTROL MENU  
SETUP X.X  
HIGH RANGE: 500.0 Conc  
.0 ENTR EXIT  
MODE SET UNIT  
EXIT  
0
0
0
0
SETUP X.X  
RANGE MODE: SNGL  
SETUP X.X  
RANGE CONTROL MENU  
EXIT Returns  
to the Main  
SAMPLE Display  
SNGL DUAL AUTO  
ENTR EXIT  
MODE SET UNIT  
EXIT  
When the instrument’s range mode is set to DUAL the concentration field in the upper right hand corner  
of the display alternates between displaying the low range value and the high range value. The  
concentration currently being displayed is identified as follows: C1 = Low (or A1) and C2 = High (or A2).  
NOTE  
In DUAL range mode the LOW and HIGH ranges have separate slopes and offsets  
for computing CO2 concentration.  
The two ranges must be independently calibrated.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.8.5. Auto Range Mode (AUTO)  
In AUTO range mode, the analyzer automatically switches the reporting range between two user-defined  
ranges (low and high). The unit will switch from low range to high range when the CO2 concentration  
exceeds 98% of the low range span. The unit will return from high range back to low range once both the  
CO2 concentration falls below 75% of the low range span.  
In AUTO Range mode the instrument reports the same data in the same range on both the A1 and A2  
outputs and automatically switches both outputs between ranges as described above. Also, the RANGE  
test function displayed on the front panel will automatically switch to show which range is in effect.  
The high/low range status is also reported through the external, digital status outputs (Section 6.15.1.1).  
To set individual ranges press the following keystroke sequence.  
SETUP X.X  
RANGE MODE: AUTO  
SNGL DUAL AUTO  
ENTR EXIT  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
RANGE CONTROL MENU  
EXIT x 2 returns  
to the main  
SAMPLE display  
MODE SET UNIT  
EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X  
LOW RANGE: 500.0 Conc  
.0 ENTR EXIT  
Toggle the numeral  
buttons to set the  
LOW and HIGH  
range value.  
SETUP X.X  
RANGE CONTROL MENU  
0
0
5
5
0
0
MODE SET UNIT  
ENTR accepts the  
new setting, EXIT  
ignores the new  
setting.  
SETUP X.X  
RANGE MODE: SNGL  
SETUP X.X  
HIGH RANGE: 500.0 Conc  
.0 ENTR EXIT  
SNGL DUAL AUTO  
ENTR EXIT  
0
0
0
0
CAUTION  
In AUTO range mode the LOW and HIGH ranges have separate slopes and offsets  
for computing CO2 concentration.  
The two ranges must be independently calibrated.  
NOTE  
Avoid accidentally setting the low range of the instrument with a higher span limit  
than the high range. This will cause the unit to stay in the low reporting range  
perpetually and defeat the function of the AUTO range mode.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.8.6. Range Units  
The GFC 7000TA can display concentrations in parts per billion (109 mols per mol, PPB), parts per million  
(106 mols per mol, PPM), micrograms per cubic meter (µg/m3, UG), milligrams per cubic meter (mg/m3,  
MG) or percent (volume CO2/volume sample gas, %). Changing units affects all of the display, analog  
outputs, COM port and DAS values for all reporting ranges regardless of the analyzer’s range mode.  
NOTE  
Concentrations displayed in mg/m3 and ug/m3 use 0C, 760 mmHg for Standard  
Temperature and Pressure (STP). Consult your local regulations for the STP used  
by your agency.  
Conversion factors from volumetric to mass units are:  
CO2: ppb x 1.96 = µg/m3; ppm x 1.96 = mg/m3  
To change the concentration units:  
SAMPLE  
RANGE = 500.00 PPB  
CO2=X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
EXIT returns  
to the main menu.  
SETUP X.X  
RANGE CONTROL MENU  
MODE SET UNIT  
SETUP X.X  
CONC UNITS: PPM  
Select the preferred  
concentration unit.  
PPM PPB UGM MGM  
%
ENTER EXIT  
ENTER EXIT  
ENTR accepts  
the new unit,  
EXIT returns  
to the SETUP  
menu.  
SETUP X.X  
CONC UNITS: %  
PPM PPB UGM MGM  
%
NOTE  
Once the units of measurement have been changed the unit MUST be recalibrated,  
as the “expected span values” previously in effect will no longer be valid. Simply  
entering new expected span values without running the entire calibration routine  
is not sufficient.  
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6.8.7. Dilution Ratio  
The dilution ratio is a software option that allows the user to compensate for any dilution of the sample  
gas before it enters the sample inlet. Using the dilution ratio option is a 4-step process:  
1. Select reporting range units: Follow the procedure in Section 6.8.6.  
2. Select the range: Use the procedures in Sections 6.8.2 – 6.8.5. Make sure that the SPAN value  
entered is the maximum expected concentration of the undiluted calibration gas and that the span  
gas is either supplied through the same dilution inlet system as the sample gas or has an  
appropriately lower actual concentration. For example, with a dilution set to 100, a 10 ppm gas  
can be used to calibrate a 1000 ppm sample gas if the span gas is not routed through the dilution  
system. On the other hand, if a 1000 ppm span gas is used, it needs to pass through the same  
dilution steps as the sample gas.  
3. Set the dilution factor as a gain (e.g., a value of 20 means 20 parts diluting gas and 1 part of  
sample gas):  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP C.3  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP C.3  
RANGE CONTROL MENU  
DIL only appears  
if the dilution ratio  
option has been  
installed  
MODE SET UNIT DIL  
EXIT ignores the  
new setting.  
SETUP C.3  
DIL FACTOR: 1.0 GAIN  
.0 ENTR  
ENTR accepts the  
Toggle these buttons to set the  
dilution factor.  
new setting.  
0
0
0
1
EXIT  
This is the number by which the  
analyzer will multiply the CO2  
concentrations of the gas passing  
through the reaction cell.  
SETUP C.3  
DIL FACTOR: 20.0 GAIN  
.0 ENTR  
0
0
2
0
EXIT  
The analyzer multiplies the measured gas concentrations with this dilution factor and displays the result.  
NOTE  
Once the above settings have been entered, the instrument needs to be  
recalibrated using one of the methods discussed in Section 7.  
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6.9. SETUP PASS: Password Feature  
The GFC 7000TA provides password protection of the calibration and setup functions to prevent  
unauthorized adjustments. When the passwords have been enabled in the PASS menu item, the system  
will prompt the user for a password anytime a password-protected function is requested.  
There are three levels of password protection, which correspond to operator, maintenance, and  
configuration functions. Each level allows access to all of the functions in the previous level.  
Table 6-9: Password Levels  
PASSWORD  
No password  
818  
LEVEL  
MENU ACCESS ALLOWED  
TEST, MSG, CLR  
Operator  
Maintenance  
Configuration  
CAL, CALZ, CALS  
929  
SETUP, VARS, DIAG  
To enable or disable passwords, press the following keystroke sequence:  
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Model GFC7000TA Carbon Dioxide Analyzer  
Example: If all passwords are enabled, the following keypad sequence would be required to enter the  
SETUP menu:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
prompts for password  
number  
See Table 6-8 for  
Passwords and Levels  
SAMPLE  
ENTER SETUP PASS: 0  
ENTR EXIT  
0
0
0
8
Example: this  
password enables the  
SETUP mode  
SAMPLE  
ENTER SETUP PASS: 0  
Press individual  
buttons to set  
numbers  
8
1
ENTR EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
Note that the instrument still prompts for a password when entering the VARS and DIAG menus, even if  
passwords are disabled, but it displays the default password (818) upon entering these menus. The user  
only has to press ENTR to access the password-protected menus but does not have to enter the required  
number code.  
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Model GFC7000TA Carbon Dioxide Analyzer  
6.10. SETUP CLK: Setting the Internal Time-of-Day Clock  
The GFC 7000TA has a time of day clock that supports the AutoCal timer, time of day TEST function, and  
time stamps on most COM port messages. To set the time-of-day, press:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
SETUP X.X  
TIME-OF-DAY CLOCK  
Enter Current  
Time-of-Day  
Enter Current  
Date-of-Year  
TIME DATE  
EXIT  
SETUP X.X  
DATE: 01-JAN-02  
SETUP X.X  
TIME: 12:00  
0
1
JAN  
0
2
ENTR EXIT  
1
2
: 0  
0
ENTR EXIT  
SETUP X.X  
JAN  
DATE: 01-JAN-02  
SETUP X.X3  
: 0  
TIME: 12:00  
0
1
0
2
ENTR EXIT  
1
2
0
ENTR EXIT  
SETUP X.X  
TIME-OF-DAY CLOCK  
TIME DATE  
SETUP X.X  
EXIT  
PRIMARY SETUP MENU  
EXIT returns  
to the main  
SAMPLE display  
CFG DAS RNGE PASS CLK MORE  
EXIT  
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Model GFC7000TA Carbon Dioxide Analyzer  
In order to compensate for CPU clocks which run faster or slower, you can adjust a variable called  
CLOCK_ADJ to speed up or slow down the clock by a fixed amount every day. To change this variable,  
press:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUPX.X  
1 ) CONC_PRECISION = 3  
EDIT PRNT EXIT  
< TST TST > CAL  
SETUP  
PREV NEXT JUMP  
SETUP X.X  
PRIMARY SETUP MENU  
Continue to press NEXT until …  
CFG DAS RNGE PASS CLK MORE  
EXIT  
SETUP X.X  
4) CLOCK_ADJ=0 Sec/Day  
JUMP EDIT PRNT EXIT  
SETUP X.X  
SECONDARY SETUP MENU  
PREV  
COMM VARS DIAG  
EXIT  
SETUP X.X  
CLOCK_ADJ:0 Sec/Day  
ENTR EXIT  
SETUP X.X  
0 ) DAS_HOLD_OFF=15.0 Minutes  
+
0
0
NEXT JUMP  
EDIT PRNT EXIT  
Enter sign and number of seconds per  
day the clock gains (-) or loses (+).  
SETUP X.X  
4) CLOCK_ADJ=0 Sec/Day  
EDIT PRNT EXIT  
PREV NEXT JUMP  
3x EXIT returns  
to the main SAMPLE display  
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Model GFC7000TA Carbon Dioxide Analyzer  
6.11. SETUP MORECOMM: Using the Analyzer’s  
Communication Ports  
The GFC 7000TA is equipped with an Ethernet port, a USB port and two serial communication (COMM)  
ports located on the rear panel (Figure 3-2). Both com ports operate similarly and give the user the ability  
to communicate with, issue commands to, and receive data from the analyzer through an external  
computer system or terminal.  
By default, both com ports operate on the RS-232 protocol.  
The RS232 port (used as COM1) can also be configured to operate in single or RS-232 multidrop  
mode (option 62; See Section 5.5.2 and 6.11.7).  
The COM2 port can be configured for standard RS-232 operation or half-duplex RS-485  
communication (For RS-485 communication, please contact the factory).  
A code-activated switch (CAS), can also be used on either port to connect typically between 2 and 16  
send/receive instruments (host computer(s) printers, data loggers, analyzers, monitors, calibrators, etc.)  
into one communications hub. Contact Teledyne Instruments sales for more information on CAS  
systems.  
6.11.1. Analyzer ID  
Each type of Teledyne Instruments analyzer is configured with a default ID code. The default ID code for  
all GFC 7000TA analyzers is 360. The ID number is only important if more than one analyzer is  
connected to the same communications channel such as when several analyzers are on the same  
Ethernet LAN (See Section 6.11.6); in a RS-232 multidrop chain (See Section 6.11.7) or operating over a  
RS-485 network. If two analyzers of the same model type are used on one channel, the ID codes of one  
or both of the instruments needs to be changed.  
To edit the instrument’s ID code, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
SETUP X.X  
COMMUNICATIONS MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
ID INET COM1  
EXIT  
Toggle these keys to  
cycle through the  
available character set:  
0-9  
ENTR accepts the new  
SETUP X.  
MACHINE ID: 360 ID  
settings  
EXIT ignores the new  
0
2
0
0
ENTR EXIT  
settings  
The ID number is only important if more than one analyzer is connected to the same communications  
channel (e.g., a multi-drop setup). Different models of Teledyne Instruments analyzers have different  
default ID numbers, but if two analyzers of the same model type are used on one channel (for example,  
two GFC 7000TA’s), the ID of one instrument needs to be changed.  
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Model GFC7000TA Carbon Dioxide Analyzer  
The ID can also be used for to identify any one of several analyzers attached to the same network but  
situated in different physical locations.  
6.11.2. COM Port Default Settings  
Received from the factory, the analyzer is set up to emulate a DCE or modem, with pin 3 of the DB-9  
connector designated for receiving data and pin 2 designated for sending data.  
COM1: RS-232 (fixed) DB-9 male connector.  
o
o
o
Baud rate: 19200 bits per second (baud).  
Data Bits: 8 data bits with 1 stop bit.  
Parity: None.  
COM2: RS-232 (configurable), DB-9 female connector.  
o
o
o
Baud rate: 115000 bits per second (baud).  
Data Bits: 8 data bits with 1 stop bit.  
Parity: None.  
NOTE  
Cables that appear to be compatible because of matching connectors may  
incorporate internal wiring that make the link inoperable. Check cables acquired  
from sources other than Teledyne Instruments for pin assignments before using.  
In its default configuration, the GFC 7000TA analyzer has two available RS-232 Com ports accessible via  
2 DB-9 connectors on the back panel of the instrument. The COM1 connector is a male DB-9 connector  
and the COM2 is a female DB9 connector.  
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Figure 6-7:  
Rear Panel Connector Pin-Outs for COM1 & COM2 in RS-232 Mode  
The signals from these two connectors are routed from the motherboard via a wiring harness to two 10-  
pin connectors on the CPU card, J11 and J12.  
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Figure 6-8:  
CPU Connector Pin-Outs for COM1 & COM2 in RS-232 Mode  
Teledyne Instruments offers two mating cables, one of which should be applicable for your use.  
Part number WR000077, a DB-9 female to DB-9 female cable, 6 feet long. Allows connection of  
COM1 with the serial port of most personal computers. Also available as Option 60 (See Section  
5.5.1).  
Part number WR000024, a DB-9 female to DB-25 male cable. Allows connection to the most  
common styles of modems (e.g. Hayes-compatible) and code activated switches.  
Both cables are configured with straight-through wiring and should require no additional adapters.  
To assist in properly connecting the serial ports to either a computer or a modem, there are activity  
indicators just above the RS-232 port. Once a cable is connected between the analyzer and a computer  
or modem, both the red and green LEDs should be on. If the lights for COM 1 are not lit, use small switch  
on the rear panel to switch it between DTE and DCE modes (See  
Section 6.11.4). If both LEDs are still not illuminated, check the cable for proper wiring.  
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6.11.3. RS-485 Configuration of COM2  
As delivered from the factory, COM2 is configured for RS-232 communications. To configure this port for  
RS-485 communication, please contact the factory. If COM2 is configured for RS-485, the USB com port  
is no longer enabled.  
6.11.4. DTE and DCE Communication  
RS-232 was developed for allowing communications between data terminal equipment (DTE) and data  
communication equipment (DCE). Basic terminals always fall into the DTE category whereas modems  
are always considered DCE devices. The difference between the two is the pin assignment of the Data  
Receive and Data Transmit functions. DTE devices receive data on pin 2 and transmit data on pin 3;  
DCE devices receive data on pin 3 and transmit data on pin 2.  
To allow the analyzer to be used with terminals (DTE), modems (DCE) and computers (which can be  
either), a switch mounted below the serial ports on the rear panel allows the user to switch between the  
two functions.  
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6.11.5. COM Port Communication Modes  
Each of the analyzer’s serial ports can be configured to operate in a number of different modes, listed in  
Table 6-10 which can be combined by adding the mode ID numbers. For example, quiet mode, computer  
mode and internet-enabled mode would carry a combined mode ID of 11, the standard configuration on  
the GFC 7000TA COM2 port. Note that each COM port needs to be configured independently.  
Table 6-10: Com Port Communication Modes  
MODE1  
QUIET  
ID  
1
DESCRIPTION  
Quiet mode suppresses any feedback from the analyzer (DAS reports, and warning  
messages) to the remote device and is typically used when the port is communicating  
with a computer program such as APICOM. Such feedback is still available but a  
command must be issued to receive them.  
COMPUTER  
SECURITY  
Computer mode inhibits echoing of typed characters and is used when the port is  
communicating with a computer program, such as APICOM.  
2
4
When enabled, the serial port requires a password before it will respond. The only  
command that is active is the help screen (? CR).  
HESSEN  
PROTOCOL  
The Hessen communications protocol is used in some European countries. Teledyne  
Instruments part number 02252 contains more information on this protocol.  
16  
E, 7, 1  
When turned on this mode switches the com port settings  
from  
No parity; 8 data bits; 1 stop bit  
to  
2048  
Even parity; 7 data bits; 1 stop bit  
RS-485  
Configures the COM2 Port for RS-485 communication. RS-485 mode has precedence  
over multidrop mode if both are enabled.  
1024  
32  
MULTIDROP  
PROTOCOL  
Multidrop protocol allows a multi-instrument configuration on a single communications  
channel. Multidrop requires the use of instrument IDs.  
ENABLE  
MODEM  
Enables to send a modem initialization string at power-up. Asserts certain lines in the  
RS-232 port to enable the modem to communicate.  
64  
ERROR  
Fixes certain types of parity errors at certain Hessen protocol installations.  
CHECKING2  
128  
256  
XON/XOFF  
Disables XON/XOFF data flow control also known as software handshaking.  
HANDSHAKE2  
HARDWARE  
HANDSHAKE  
Enables CTS/RTS style hardwired transmission handshaking. This style of data  
transmission handshaking is commonly used with modems or terminal emulation  
protocols as well as by Teledyne Instrument’s APICOM software.  
8
HARDWARE  
FIFO2  
Improves data transfer rate when on of the com ports.  
512  
COMMAND  
PROMPT  
Enables a command prompt when in terminal mode.  
4096  
1 Modes are listed in the order in which they appear in the  
SETUP MORE com COM[1 OR 2] MODE menu  
2 The default sting for this feature is ON. Do not disable unless instructed to by Teledyne Instruments Customer Service  
personnel.  
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Model GFC7000TA Carbon Dioxide Analyzer  
Press the following touchscreen buttons to select a communication mode for one of the com Ports, such  
as the following example where HESSEN PROTOCOL mode is enabled:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT returns to  
the previous  
menu  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
EXIT  
EXIT  
EXIT  
SETUP X.X  
COMMUNICATIONS MENU  
Select which COMM  
port to configure  
ID INET COM1 COM2  
The sum of the mode  
IDs of the selected  
modes is displayed here  
SETUP X.X  
SET> EDIT  
COM1MODE:0  
SETUP X.X  
COM1 QUIET MODE: OFF  
ENTR EXIT  
NEXT OFF  
Continue pressing next until …  
SETUP X.X COM1 HESSEN PROTOCOL : OFF  
Use PREV and NEXT to  
move between available  
modes.  
PREV NEXT OFF  
ENTR EXIT  
A mode is enabled by  
toggling the ON/OFF  
button.  
ENTR accepts the new  
SETUP X.X COM1 HESSEN PROTOCOL : ON  
settings  
EXIT ignores the new  
PREV NEXT ON  
ENTR EXIT  
settings  
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6.11.6. Remote Access via the Ethernet  
When using the Ethernet interface, the analyzer can be connected to any standard 10BaseT or 100Base  
T Ethernet network via low-cost network hubs, switches or routers. The interface operates as a standard  
TCP/IP device on a user selectable port, which otherwise defaults to port 3000. This allows a remote  
computer to connect through the internet to the analyzer using APICOM, terminal emulators or other  
programs.  
The Ethernet connector has two LEDs that are on the connector itself, indicating its current operating  
status.  
Table 6-11: Ethernet Status Indicators  
LED  
Function  
amber (link)  
green (activity  
On when connection to the LAN is valid.  
Flickers during any activity on the LAN.  
6.11.6.1. Configuring the Ethernet Interface using DHCP  
The Ethernet option for your analyzer uses Dynamic Host Configuration Protocol (DHCP) to automatically  
configure its interface with your LAN. This requires your network servers also be running DHCP. The  
analyzer will do this the first time you turn the instrument on after it has been physically connected to your  
network. Once the instrument is connected and turned on it will appear as an active device on your  
network without any extra set up steps or lengthy procedures.  
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Table 6-12: LAN/Internet Configuration Properties  
PROPERTY  
DHCP  
DEFAULT STATE  
DESCRIPTION  
This displays whether the DHCP is turned ON or OFF.  
Press EDIT and toggle ON for automatic configuration  
after first consulting network administrator. (  
ON  
INSTRUMENT  
IP ADDRESS  
This string of four packets of 1 to 3 numbers each (e.g.  
192.168.76.55.) is the address of the analyzer itself.  
Can only be edited when DHCP is set to OFF.  
0.0.0.0  
0.0.0.0  
GATEWAY IP  
ADDRESS  
A string of numbers very similar to the Instrument IP  
address (e.g. 192.168.76.1.) that is the address of the  
computer used by your LAN to access the Internet.  
Can only be edited when DHCP is set to OFF.  
Also a string of four packets of 1 to 3 numbers each (e.g.  
255.255.252.0) that identifies the LAN to which the device  
is connected.  
SUBNET MASK  
All addressable devices and computers on a LAN must  
have the same subnet mask. Any transmissions sent to  
devices with different subnets are assumed to be outside  
of the LAN and are routed through the gateway computer  
onto the Internet.  
This number defines the terminal control port by which the  
instrument is addressed by terminal emulation software,  
such as Internet or Teledyne’s APICOM.  
3000  
T100  
TCP PORT1  
The name by which your analyzer will appear when  
addressed from other computers on the LAN or via the  
Internet. To change, see Section 6.11.6.3.  
HOST NAME  
1 Do not change the setting for this property unless instructed to by Teledyne Customer Service  
personnel.  
NOTE  
It is a good idea to check these settings the first time you power up your analyzer  
after it has been physically connected to the LAN/Internet to make sure that the  
DHCP has successfully downloaded the appropriate information from you network  
server(s).  
If the gateway IP, instrument IP and the subnet mask are all zeroes (e.g.  
“0.0.0.0”), the DCHP was not successful.  
You may have to manually configure the analyzer’s Ethernet properties.  
See your network administrator.  
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To view the above properties, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP X.X  
DHCP: ON  
< TST TST > CAL  
SETUP  
SET> EDIT  
EXIT  
EXIT  
EXIT  
EXIT  
EXIT  
EXIT  
SETUP X.X  
INST IP: 0.0.0.0  
SETUP X.X  
PRIMARY SETUP MENU  
<SET SET>  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X GATEWAY IP: 0.0.0.0  
SETUP X.X SECONDARY SETUP MENU  
EDIT Key  
Disabled  
<SET SET>  
COMM VARS DIAG  
SETUP X.X SUBNET MASK: 0.0.0.0  
SETUP X.X  
ID INET  
COMMUNICATIONS MENU  
<SET SET>  
COM1  
EXIT  
SETUP X.X  
TCP PORT: 3000  
SAMPLE  
ENTER SETUP PASS : 818  
8
<SET SET> EDIT  
8
1
ENTR EXIT  
SETUP X.X HOSTNAME: T360  
From this point on,  
EXIT returns to  
COMMUNICATIONS  
MENU  
<SET  
EDIT  
Do not alter unless  
directed to by Teledyne  
Instruments Customer  
Service personnel  
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6.11.6.2. Manually Configuring the Ethernet (Static IP Address)  
To configure Ethernet communication manually:  
1. Connect a cable from the analyzer’s Ethernet port to a Local Area Network (LAN) or Internet  
port.  
2. From the analyzer’s front panel touchscreen, access the Communications Menu as shown  
below, turning DHCP mode to OFF.  
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Next, refer to Table 6-12 for the default Ethernet configuration settings and configure the INSTRUMENT  
IP addresses by pressing:  
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6.11.6.3. Changing the Analyzer’s HOSTNAME  
The HOSTNAME is the name by which the analyzer appears on your network. The default name for all  
Teledyne Instruments Model GFC 7000TA analyzers is GFC 7000TA. To change this name (particularly  
if you have more than one Model GFC 7000TA analyzer on your network), press.  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP X.X  
DHCP: ON  
< TST TST > CAL  
SETUP  
SET> EDIT  
EXIT  
Continue pressing SET> UNTIL …  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X HOSTNAME:  
<SET EDIT  
SETUP X.X SECONDARY SETUP MENU  
EXIT  
COMM VARS DIAG ALRM  
SETUP X.X HOSTNAME:  
SETUP X.X  
COMMUNICATIONS MENU  
<CH CH> INS DEL [?]  
ENTR EXIT  
ID INET COM1 COM2  
EXIT  
Use these buttons (See Table 6-  
19) to edit HOSTNAME  
SAMPLE  
ENTER SETUP PASS : 818  
SETUP X.X HOSTNAME: T360-FIELD1  
8
1
8
ENTR EXIT  
<SET  
EDIT  
EXIT  
SETUP X.X  
INITIALIZING INET 0%  
…
INITIALIZING INET 100%  
SETUP X.X  
INITIALIZATION SUCCEEDED  
SETUP X.X  
INITIALIZATION FAILED  
SETUP X.X  
ID INET  
COMMUNICATIONS MENU  
COM1 COM2  
Contact your IT Network  
Administrator  
EXIT  
Table 6-13: Internet Configuration Touchscreen Functions  
FUNCTION  
BUTTON  
<CH  
CH>  
INS  
DEL  
[?]  
Moves the cursor one character to the left.  
Moves the cursor one character to the right.  
Inserts a character before the cursor location.  
Deletes a character at the cursor location.  
Press this button to cycle through the range of numerals and characters available for  
insertion. 0-9, A-Z, space ’ ~ ! # $ % ^ & * ( ) - _ = +[ ] { } < >\ | ; : , . / ?  
ENTR  
EXIT  
Accepts the new setting and returns to the previous menu.  
Ignores the new setting and returns to the previous menu.  
Some buttons only appear as applicable.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.11.7. Multidrop RS-232 Set Up  
The RS-232 multidrop consists of a printed circuit assembly that is seated on the analyzer’s CPU card  
(see Figures 6-10 and 6-13) and is connected to the CPU and the motherboard. This PCA includes all  
circuitry required to enable your analyzer for multidrop operation. It converts the instrument’s RS232 port  
to multidrop configuration allowing up to eight analyzers to be connected the same I/O port of the host  
computer.  
Because both of the DB9 connectors on the analyzer’s back panel are needed to construct the multidrop  
chain, COM2 is no longer available for separate RS-232 or RS-485 operation; however, the USB com  
port is available.  
Figure 6-9:  
Multidrop/LVDS PCA Seated on CPU  
Each analyzer in the multidrop chain must have:  
One Teledyne Instruments option 62 installed.  
One 6’ straight-through, DB9 male DB9 Female cable (Teledyne Instruments P/N WR0000101) is  
required for each analyzer.  
To set up the network, for each analyzer:  
1. With NO power to the instrument, open the rear panel and locate the CPU.  
2. On the LVDS card, disconnect the cable that’s connected to J1 and remove the LVDS card from  
the CPU card.  
3. Mount the Multidrop/LVDS card onto the CPU and reconnect the LVDS cable to J1.  
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Model GFC7000TA Carbon Dioxide Analyzer  
4. Connect a cable between the Multidrop/LVDS card J4 and the motherboard P12.  
5. Connect a cable between the Multidrop/LVDS card J3 and the CPU COM1 connector.  
6. Close the instrument.  
7. Using straight-through, DB9 male DB9 Female cable, interconnect the host and the analyzers  
as shown in Figure 6-14.  
8. BEFORE communicating from the host, power on the instruments and check that the Machine ID  
code is unique for each (see Section Analyzer ID). On the front panel menu, use  
SETUP>MORE>COMM>ID. Note that the default ID is typically the model number; to change the  
4-digit identification number, press the button of the digit to be changed)..  
NOTE:  
Teledyne Instruments recommends setting up the first link, between the Host and  
the first analyzer and testing it before setting up the rest of the chain.  
KEY:  
Host  
Female DB9  
RS-232 port  
Male DB9  
Analyzer  
Analyzer  
Analyzer  
Last Analyzer  
COM2  
COM2  
COM2  
COM2  
RS-232  
RS-232  
RS-232  
RS-232  
Make Sure  
Jumper between  
JP2 pins 21 22  
is installed.  
Figure 6-10:  
RS232-Multidrop PCA Host/Analyzer Interconnect Diagram  
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Model GFC7000TA Carbon Dioxide Analyzer  
6.11.8. COM Port Baud Rate  
To select the baud rate of one of the COM Ports, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
EXIT returns to  
the previous  
menu  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
SETUP X.X  
COMMUNICATIONS MENU  
Select which COM port  
to configure.  
ID INET COM1 COM2  
EXIT  
EXIT  
EXIT  
EXIT  
EXIT  
SETUP X.X  
SET> EDIT  
COM1MODE:0  
Press SET> until you  
reach COM1 BAUD  
RATE  
EXAMPLE  
SETUP X.X  
COM1 BAUD RATE:19200  
Use PREV and NEXT to  
move between available  
baud rates.  
EXIT  
ignores the  
new setting  
<SET SET> EDIT  
300  
1200  
4800  
SETUP X.X  
COM1 BAUD RATE:19200  
ENTR  
9600  
ENTR  
accepts the  
new setting  
19200  
38400  
57600  
115200  
PREV NEXT  
SETUP X.X  
COM1 BAUD RATE:9600  
ENTR  
NEXT ON  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.11.9. COM Port Testing  
The serial ports can be tested for correct connection and output in the com menu. This test sends a  
string of 256 ‘w’ characters to the selected COM port. While the test is running, the red LED on the rear  
panel of the analyzer should flicker.  
To initiate the test press the following touchscreen button sequence.  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG  
SETUP X.X  
COMMUNICATIONS MENU  
Select which  
COM port to test.  
ID INET COM1  
COM2  
EXIT  
EXIT  
EXIT  
SETUP X.X  
COM1 MODE:0  
SET> EDIT  
SETUP X.X  
COM1 BAUD RATE:19200  
<SET SET> EDIT  
SETUP X.X  
<SET  
COM1 : TEST PORT  
TEST  
EXIT  
SETUP X.X  
<SET  
TRANSMITTING TO COM1  
TEST  
EXIT returns to  
COMM menu  
EXIT  
Test runs  
automatically  
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6.12. SETUP MORE VARS: Internal Variables (VARS)  
The GFC 7000TA has several-user adjustable software variables, which define certain operational  
parameters. Usually, these variables are automatically set by the instrument’s firmware, but can be  
manually re-defined using the VARS menu. Table 6-14 lists all variables that are available within the 818  
password protected level.  
Table 6-14: Variable Names (VARS) Revision B.3  
ALLOWED  
VALUES  
NO.  
VARIABLE  
DESCRIPTION  
Changes the internal data acquisition system (DAS) hold-off  
time, which is the duration when data are not stored in the  
DAS because the software considers the data to be  
questionable. That is the case during warm-up or just after  
the instrument returns from one of its calibration modes to  
SAMPLE mode. DAS_HOLD_OFF can be disabled entirely  
in each DAS channel.  
Can be between 0.5  
and 20 minutes  
0
DAS_HOLD_OFF  
Default=15 min.  
Allows the user to set the number of significant digits to the  
CONC_PRECISION right of the decimal point display of concentration and  
AUTO, 1, 2, 3, 4  
Default=AUTO  
1
stability values.  
Selects which gas measurement is displayed when the STABIL  
test function is selected.  
1
STABIL_GAS  
CO2 & O2  
2
3
Dynamic zero automatically adjusts offset and slope of the  
CO2 response when performing a zero point calibration  
during an AutoCal (Section 7).  
DYN_ZERO  
DYN_SPAN  
CLOCK_ADJ  
ON/OFF  
Dynamic span automatically adjusts slope and slope of the  
CO2 response when performing a zero point calibration  
during an AutoCal (Section 7).  
4
5
ON/OFF  
Note that the DYN_ZERO and DYN_SPAN features are not  
allowed for applications requiring EPA equivalency.  
Adjusts the speed of the analyzer’s clock. Choose the +  
sign if the clock is too slow, choose the - sign if the clock is  
too fast.  
-60 to +60 s/day  
1 O2 option is only available in analyzers with O2 sensor options installed.  
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Model GFC7000TA Carbon Dioxide Analyzer  
To access and navigate the VARS menu, use the following touchscreen button sequence.  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
SETUP X.X  
SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
EXIT  
SAMPLE  
ENTER SETUP PASS : 818  
EXIT ignores the new setting.  
ENTR accepts the new setting.  
8
1
8
ENTR EXIT  
SETUP X.X  
0 ) DAS_HOLD_OFF=15.0 Minutes  
SETUP X.X  
.0  
0)DAS_HOLD_OFF=15.0 Minutes  
ENTR EXIT  
NEXT JUMP  
EDIT PRNT EXIT  
1
5
Toggle each button to change setting  
SETUP X.X  
1) CONC_PRECUISION : 3  
SETUP X.X  
1) CONC_PRECUISION : 3  
PREV NEXT JUMP  
EDIT PRNT EXIT  
AUTO  
0
1
2
3
4
ENTR EXIT  
Toggle each button to change setting  
SETUP X.X  
3 ) DYN_ZERO=ON  
PREV NEXT JUMP  
EDIT PRNT EXIT  
SETUP X.X  
3) DYN_ZERO=ON  
ON  
ENTR EXIT  
Toggle to change setting  
SETUP X.X  
4) DYN_SPAN=ON  
PREV NEXT JUMP  
EDIT PRNT EXIT  
SETUP X.X  
4) DYN_SPAN=ON  
ON  
ENTR EXIT  
Toggle to change setting  
SETUP X.X  
5) CLOCK_ADJ=0 Sec/Day  
SETUP X.X  
5) CLOCK_ADJ=0 Sec/Day  
ENTR EXIT  
PREV NEXT JUMP  
EDIT PRNT EXIT  
+
0
0
Toggle to change setting  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13. SETUP MORE DIAG: Using the Diagnostics  
Functions  
A series of diagnostic tools is grouped together under the SETUPMOREDIAG menu. As these  
parameters are dependent on firmware revision (see Menu Tree A-6 in Appendix A). The individual  
parameters, however, are explained in more detail in the indicated in 6-15. These tools can be used in a  
variety of troubleshooting and diagnostic procedures and are referred to in many places of the  
maintenance and trouble-shooting s.  
Table 6-15: GFC 7000TA Diagnostic (DIAG) Functions  
Front Panel  
DIAGNOSTIC FUNCTION AND MEANING  
Mode Indicator  
SIGNAL I/O: Allows observation of all digital and analog signals in  
the instrument. Allows certain digital signals such as valves and  
heaters to be toggled ON and OFF.  
DIAG I/O  
6.13.2  
6.13.3  
ANALOG OUTPUT: When entered, the analyzer performs an analog  
output step test. This can be used to calibrate a chart recorder or  
to test the analog output accuracy.  
DIAG AOUT  
ANALOG I/O CONFIGURATION: the signal levels of the instruments  
analog outputs may be calibrated (either individually or as a  
group). Various electronic parameters such as signal span, and  
offset are available for viewing and configuration.  
DIAG AIO  
6.13.4  
ELECTRIC TEST: The analyzer is performing an electric test. This  
test simulates IR detector signal in a known manner so that the  
proper functioning of the sync/demod board can be verified.  
DIAG OPTIC  
DIAG ELEC  
DIAG PCAL  
6.13.5  
6.13.6  
6.13.7  
DARK CALIBRATION: The analyzer is performing a dark  
calibration procedure. This procedure measures and stores the  
inherent dc offset of the sync/demod board electronics.  
PRESSURE CALIBRATION: The analyzer records the current  
output of the sample gas pressure sensor. This value is used by  
the CPU to compensate the CO2 concentration.  
FLOW CALIBRATION: This function is used to calibrate the gas flow  
DIAG FCAL  
DIAG TCHN  
6.13.8  
6.13.9  
output signal. This setting is retained when exiting DIAG.  
TEST CHAN OUTPUT: Configures the A4 analog output channel.  
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Model GFC7000TA Carbon Dioxide Analyzer  
6.13.1. Accessing the Diagnostic Features  
To access the DIAG functions press the following buttons:  
SAMPLE*  
RANGE = 500.00 PPM  
CO2 =X.XXX  
DIAG  
ANALOG I / O CONFIGURATION  
NEXT ENTR EXIT  
< TST TST > CAL  
SETUP  
PREV  
SETUP X.X  
PRIMARY SETUP MENU  
EXIT returns  
to the main  
SAMPLE  
display  
DIAG  
ELECTRICAL TEST  
DARK CALIBRATION  
CFG DAS RNGE PASS CLK MORE  
EXIT  
PREV  
NEXT  
NEXT  
ENTR EXIT  
ENTR EXIT  
ENTR EXIT  
ENTR EXIT  
ENTR EXIT  
SETUP X.X SECONDARY SETUP MENU  
EXIT returns  
to the PRIMARY  
SETUP MENU  
DIAG  
COMM VARS DIAG ALRM  
EXIT  
PREV  
SAMPLE  
ENTER SETUP PASS: 818  
8
DIAG  
PRESSURE CALIBRATION  
NEXT  
8
1
ENTR EXIT  
PREV  
DIAG  
SIGNAL I / O  
From this point  
forward, EXIT returns  
to the  
DIAG  
FLOW CALIBRATION  
TEST CHAN OUTPUT  
NEXT  
NEXT  
ENTR EXIT  
ENTR EXIT  
PREV  
NEXT  
NEXT  
SECONDARY  
SETUP MENU  
DIAG  
ANALOG OUTPUT  
DIAG  
PREV  
PREV  
6.13.2. Signal I/O  
The signal I/O diagnostic mode allows reviewing and changing the digital and analog input/output  
functions of the analyzer. See Appendix A-4 for a complete list of the parameters available for review  
under this menu.  
NOTE  
Any changes of signal I/O settings will remain in effect only until the signal I/O  
menu is exited. Exceptions are the ozone generator override and the flow sensor  
calibration, which remain as entered when exiting.  
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Model GFC7000TA Carbon Dioxide Analyzer  
To enter the signal I/O test mode, press:  
DIAG  
SIGNAL I / O  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
Use NEXT & PREV to  
move between signal  
types.  
< TST TST > CAL  
SETUP  
PREV NEXT JUMP  
ENTR EXIT  
DIAG I / O  
Test Signals Displayed Here  
Use JUMP to go  
directly to a specific  
signal location  
SETUP X.X  
PRIMARY SETUP MENU  
PREV NEXT JUMP  
PRNT EXIT  
CFG DAS RNGE PASS CLK MORE  
EXIT  
See Appendix A-4 for  
a complete list of  
EXIT returns  
to the main  
SAMPLE display  
available SIGNALS  
EXAMPLE  
DIAG I / O  
JUMP TO: 12  
SETUP X.X  
SECONDARY SETUP MENU  
EXAMPLE:  
Enter 12 to Jump to  
12) ST_CONC_VALID  
1
2
ENTR EXIT  
COMM VARS DIAG ALRM  
EXIT  
DIAG I / O  
ST_CONC_VALID = ON  
Exit to return  
to the  
SAMPLE  
ENTER SETUP PASS: 818  
DIAG menu  
PREV NEXT JUMP  
ON PRNT EXIT  
8
1
8
ENTR EXIT  
Pressing PRNT will send a formatted printout to the serial port and can be captured  
with a computer or other output device.  
6.13.3. Analog Output Step Test  
This test can be used to check the accuracy and proper operation of the analog outputs. The test forces  
all four analog output channels to produce signals ranging from 0% to 100% of the full scale range in 20%  
increments. This test is useful to verify the operation of the data logging/recording devices attached to  
the analyzer.  
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Model GFC7000TA Carbon Dioxide Analyzer  
To begin the Analog Output Step Test press:  
DIAG  
SIGNAL I / O  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
NEXT  
ENTR EXIT  
< TST TST > CAL  
SETUP  
DIAG  
PREV  
ANALOG OUTPUT  
SETUP X.X  
PRIMARY SETUP MENU  
NEXT  
ENTR EXIT  
CFG DAS RNGE PASS CLK MORE  
EXIT  
Performs  
analog output  
step test.  
DIAG AOUT  
0%  
ANALOG OUTPUT  
ANALOG OUTPUT  
SETUP X.X  
SECONDARY SETUP MENU  
0% - 100%  
COMM VARS DIAG ALRM  
EXIT  
EXIT  
Exit-Exit  
returns to the  
DIAG menu  
DIAG AOUT  
SETUP X.X  
ENTER DIAG PASS: 818  
8
1
8
ENTR EXIT  
[0%]  
EXIT  
Pressing the “0%” button while performing the test will  
pause the test at that level. Brackets will appear around  
the value: example: [20%] Pressing the same button again  
will resume the test.  
6.13.4. Analog I/O Configuration  
The analog I/O functions that are available in the GFC 7000TA are:  
Table 6-16: DIAG - Analog I/O Functions  
Sub Menu  
Function  
AOUTS CALIBRATED: Shows the status of the analog output calibration (YES/NO) and initiates a calibration of all  
analog output channels.  
CONC_OUT_1  
Sets the basic electronic configuration of the A1 analog output (CO2). There are three options:  
Range: Selects the signal type (voltage or current loop) and full scale level of the output.  
REC_OFS: Allows setting a voltage offset (not available when RANGE is set to CURRent loop.  
Auto_CAL: Performs the same calibration as AOUT CALIBRATED, but on this one channel only.  
NOTE: Any change to RANGE or REC_OFS requires recalibration of this output.  
Same as for CONC_OUT_1 but for analog channel 2 (CO2 )  
CONC_OUT_2  
TEST OUTPUT  
Same as for CONC_OUT_1 but for analog channel 4 (TEST)  
AIN CALIBRATED  
Shows the calibration status (YES/NO) and initiates a calibration of the analog to digital  
converter circuit on the motherboard.  
XIN1  
For each of 8 external analog input channels, shows the gain, offset, engineering units, and  
whether the channel is to show up as a Test function.  
.
.
.
XIN8  
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Model GFC7000TA Carbon Dioxide Analyzer  
To configure the analyzer’s three analog outputs, set the electronic signal type of each channel and  
calibrate the outputs. This consists of:  
Selecting an output type (voltage or current, if an optional current output driver has been installed)  
and the signal level that matches the input requirements of the recording device attached to the  
channel, See Section 6.13.4.1.  
Calibrating the output channel. This can be done automatically or manually for each channel, see  
Section 6.13.4.2 and 6.13.4.3.  
Adding a bipolar recorder offset to the signal, if required (Section 6.13.4.2.)  
In its standard configuration, the analyzer’s outputs can be set for the following DC voltages. Each range  
is usable from -5% to + 5% of the nominal range.  
Table 6-17: Analog Output Voltage Ranges  
RANGE  
0-0.1 V  
0-1 V  
MINIMUM OUTPUT  
-5 mV  
MAXIMUM OUTPUT  
+105 mV  
-0.05 V  
+1.05 V  
0-5 V  
-0.25 V  
+5.25 V  
0-10 V  
-0.5 V  
+10.5 V  
The default offset for all ranges is 0 VDC.  
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Model GFC7000TA Carbon Dioxide Analyzer  
The following DC current output limits apply to the current loop modules:  
Table 6-18: Analog Output Current Loop Range  
RANGE  
MINIMUM OUTPUT  
MAXIMUM OUTPUT  
0-20 mA  
0 mA  
20 mA  
These are the physical limits of the current loop modules, typical  
applications use 2-20 or 4-20 mA for the lower and upper limits. Please  
specify desired range when ordering this option.  
The default offset for all ranges is 0 mA.  
Pin assignments for the output connector at the rear panel of the instrument are shown in Table 6-19.  
ANALOG OUT  
A1  
A2  
A3  
A4  
+
-
+
-
+
-
+
-
Table 6-19: Analog Output Pin Assignments  
PIN  
ANALOG  
OUTPUT  
VOLTAGE  
SIGNAL  
CURRENT  
SIGNAL  
1
2
V Out  
I Out +  
I Out -  
A1  
A2  
Ground  
3
4
V Out  
I Out +  
I Out -  
Ground  
5
6
V Out  
I Out +  
I Out -  
A31  
Ground  
7
8
V Out  
Not used  
Not used  
A4  
Ground  
1 Output A3 is only used when the O2 sensor option is installed  
See Figure 3-2 for the location of the analog output connector on the instrument’s rear panel.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13.4.1. Analog Output Signal Type and Range Span Selection  
To select an output signal type (DC Voltage or current) and level for one output channel, activate the  
ANALOG I/O CONFIGURATION MENU (See Section 6.13.1) then press:  
FROM ANALOG I/O CONFIGURATION MENU  
DIAG  
ANALOG I / O CONFIGURATION  
PREV  
NEXT  
ENTR  
EXIT  
EXIT  
DIAG AIO  
AOUTS CALIBRATED: NO  
Press SET> to select the  
analog output channel to be  
configured. Press EDIT to  
continue  
< SET SET> CAL  
DIAG AIO  
CONC_OUT_2:5V, CAL  
< SET SET> EDIT  
EXIT  
EXIT  
DIAG AIO  
CONC_OUT_2 RANGE: 5V  
SET> EDIT  
DIAG AIOOUTPUT RANGE: 5V  
To set the signal  
level and type of  
the selected  
channel  
0.1V 1V 5V 10V CURR  
ENTR EXIT  
Pressing ENTR records the new setting  
and returns to the previous menu.  
Pressing EXIT ignores the new setting and  
returns to the previous menu.  
DIAG AIOOUTPUT RANGE: 10V  
0.1V 1V 5V 10V CURR  
ENTR EXIT  
6.13.4.2. Analog Output Calibration Mode  
The analog outputs can be calibrated automatically or manually. In its default mode, the instrument is  
configured for automatic calibration of all channels. Manual calibration should be used for the 0.1V range  
or in cases where the outputs must be closely matched to the characteristics of the recording device.  
Outputs configured for automatic calibration can be calibrated as a group or individually. Calibration of  
the analog outputs needs to be carried out on first startup of the analyzer (performed in the factory as part  
of the configuration process) or whenever re-calibration is required.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
To calibrate the outputs as a group, activate the ANALOG I/O CONFIGURATION MENU (See Section  
6.13.1), then press:  
STARTING FROM DIAGNOSTIC MENU  
(see Section 6.13.1)  
DIAG  
PREV  
ANALOG I / O CONFIGURATION  
ENTR EXIT  
Exit at any time  
to return to the  
main DIAG  
menu  
NEXT  
DIAG AIO  
AOUTS CALIBRATED: NO  
If AutoCal has been  
turned off for any  
channel, the message  
for that channel will be  
similar to:  
< SET SET> CAL  
EXIT  
DIAG AIO AUT O CALIBRATING CONC_OUT_1  
AUT O CALIBRATING CONC_OUT_2  
NOT AUTO CAL  
CONC_OUT_1  
AUTO CALIBRATING TEST_OUTPUT  
If any of the channels have  
not been calibrated this  
message will read NO.  
Exit to return to  
the I/O  
configuration  
menu  
DIAG AIO  
AOUTS CALIBRATED:  
YES  
< SET SET> CAL  
EXIT  
To automatically calibrate a single analog channel, activate the ANALOG I/O CONFIGURATION MENU  
(See Section 6.13.1), then press:  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
DIAG  
ANALOG I / O CONFIGURATION  
NEXT ENTR EXIT  
EXIT to Return  
to the main  
Sample Display  
PREV  
DIAG AIO  
AOUTS CALIBRATED: NO  
<
SET> CAL  
EXIT  
Press SET> to select the  
Analog Output channel to  
be configured. Then Press  
EDIT to continue  
DIAG AIO  
CONC_OUT_2:5V, CAL  
< SET SET> EDIT  
EXIT  
EXIT  
DIAG AIO  
CONC_OUT_2 RANGE: 5V  
DIAG AIO  
<SET  
CONC_OUT_2 CALIBRATED: NO  
CAL EXIT  
SET> EDIT  
DIAG AIO  
CONC_OUT_2 REC OFS: 0 mV  
DIAG AIO  
AUTO CALIBRATING CONC_OUT_2  
< SET SET> EDIT  
EXIT  
DIAG AIO  
CONC_OUT_2 AUTO CAL: ON  
DIAG AIO  
<SET  
CONC_OUT_2 CALIBRATED: YES  
< SET SET> EDIT  
EXIT  
CAL  
EXIT  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
To select manual output calibration for a particular channel, activate the ANALOG I/O  
CONFIGURATION MENU (See Section 6.13.1), then press:  
DIAG  
ANALOG I / O CONFIGURATION  
ENTR EXIT  
DIAG AIO  
CONC_OUT_2 REC OFS: 0 mV  
Exit to return to  
the main  
sample display  
PREV  
NEXT  
< SET SET> EDIT  
EXIT  
DIAG AIO  
AOUTS CALIBRATED: NO  
DIAG AIO  
CONC_OUT_2 AUTO CAL: ON  
< SET SET> CAL  
EXIT  
< SET SET> EDIT  
EXIT  
Press SET> to select the analog output channel to  
be configured. Then press EDIT to continue  
DIAG AIO  
CONC_OUT_2 AUTO CAL: ON  
DIAG AIO  
CONC_OUT_2:5V, CAL  
ON  
ENTR EXIT  
< SET SET> EDIT  
EXIT  
EXIT  
Toggles the  
auto cal mode  
ON/ OFF for  
this analog  
output channel  
only.  
ENTR accepts the new setting  
and returns to the previous  
menu. EXIT ignores the new  
setting and returns to the  
previous menu.  
DIAG AIO  
CONC_OUT_2 RANGE: 5V  
SET> EDIT  
Now the analog output channels should either be automatically calibrated or they should be set to manual  
calibration, which is described next.  
6.13.4.3. Manual Analog Output Calibration and Voltage Adjustment  
For highest accuracy, the voltages of the analog outputs can be manually calibrated. Calibration is done  
through the instrument software with a voltmeter connected across the output terminals (Figure 6-15).  
Adjustments are made using the touchscreen buttons by setting the zero-point first and then the span-  
point (Table 6-20).  
The software allows this adjustment to be made in 100, 10 or 1 count increments.  
Table 6-20: Voltage Tolerances for Analog Output Calibration  
Full Scale  
0.1 VDC  
1 VDC  
Zero Tolerance  
±0.0005V  
±0.001V  
Span Voltage  
90 mV  
Span Tolerance  
±0.001V  
900 mV  
±0.001V  
5 VDC  
±0.002V  
4500 mV  
4500 mV  
±0.003V  
10 VDC  
±0.004V  
±0.006V  
NOTE  
Outputs configured for 0.1V full scale should always be calibrated manually  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
See Table 3-1 for  
pin assignments  
of Analog Out  
connector on the  
rear panel  
V
+DC Gnd  
V OUT +  
V OUT -  
V IN +  
V IN -  
Recording  
Device  
ANALYZER  
Figure 6-11:  
Setup for Calibrating Analog Voltage Outputs  
To make these adjustments, the AOUT auto-calibration feature must be turned off (Section 6.13.4.2).  
Activate the ANALOG I/O CONFIGURATION MENU (See Section 6.13.1), then press:  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
FROM ANALOG I/O CONFIGURATION MENU  
DIAG AIO  
CONC_OUT_1 RANGE: 5V  
DIAG  
ANALOG I / O CONFIGURATION  
SET> EDIT  
EXIT  
PREV  
NEXT  
ENTR EXIT  
DIAG AIO  
CONC_OUT_1 REC OFS: 0 mV  
DIAG AIO  
AOUTS CALIBRATED: NO  
< SET SET> EDIT  
EXIT  
EXIT  
< SET SET> CAL  
EXIT  
If AutoCal is ON, go to  
Section 6.7.3  
DIAG AIO  
CONC_OUT_1 AUTO CAL: OFF  
Press SET> to select the analog output channel to be  
< SET SET> EDIT  
configured:  
DISPLAYED AS=  
CONC_OUT_1 =  
CONC_OUT_2 =  
TEST OUTPUT =  
CHANNEL  
A1  
A2  
A4  
DIAG AIO  
< SET  
CONC_OUT_2 CALIBRATED: NO  
CAL  
EXIT  
DIAG AIO  
CONC_OUT_1 :5V, NO CAL  
DIAG AIO CONC_OUT_1 VOLT–Z : 0 mV  
< SET SET> EDIT  
EXIT  
U100 UP10 UP DOWN DN10 D100 ENTR EXIT  
Press to increase / decrease the analog output  
by 100, 10 or 1 counts.  
EXIT ignores the  
new setting.  
ENTR accepts the  
Continue adjustments until the voltage measured  
at the output of the analyzer and/or the input of  
the recording device matches the value in the  
upper right hand corner of the display to the  
tolerance listed in Table 6-20.  
DIAG AIO CONC_OUT_1 VOLT–S : 4500 mV  
U100 UP10 UP DOWN DN10 D100 ENTR EXIT  
new setting.  
The concentration display will not change. Only  
the voltage reading of your voltmeter will change.  
DIAG AIO  
< SET  
CONC_OUT_1 CALIBRATED: YES  
CAL EXIT  
6.13.4.4. Current Loop Output Adjustment  
A current loop option is available and can be installed as a retrofit for each of the analog outputs of the  
analyzer (s 5.2). This option converts the DC voltage analog output to a current signal with 0-20 mA  
output current. The outputs can be scaled to any set of limits within that 0-20 mA range. However, most  
current loop applications call for either 2-20 mA or 4-20 mA range. All current loop outputs have a +5%  
over-range. Ranges with the lower limit set to more than 1 mA (e.g., 2-20 or 4-20 mA) also have a -5%  
under-range.  
To switch an analog output from voltage to current loop after installing the current output printed circuit  
assembly, follow the instructions in Section 6.13.4.4 and select CURR from the list of options on the  
RANGE menu.  
Adjusting the signal zero and span values of the current loop output is done by raising or lowering the  
voltage of the respective analog output. This proportionally raises or lowers the current produced by the  
current loop option.  
Similar to the voltage calibration, the software allows this current adjustment to be made in 100, 10 or 1  
count increments. Since the exact current increment per voltage count varies from output to output and  
from instrument to instrument, you will need to measure the change in the current with a current meter  
placed in series with the output circuit (Figure 6-16).  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
See Table 3-1 for  
pin assignments of  
the Analog Out  
connector on the  
rear panel.  
mA  
IN  
OUT  
V OUT +  
V OUT -  
I IN +  
I IN -  
Recording  
Device  
Analyzer  
Figure 6-12:  
Setup for Calibrating Current Outputs  
NOTE  
Do not exceed 60 V between current loop outputs and instrument ground.  
To adjust the zero and span values of the current outputs, activate the ANALOG I/O  
CONFIGURATION MENU (See Section 6.13.1), then press:  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
FROM ANALOG I/O CONFIGURATION MENU  
The instrument attempt to automatically calibrate  
the channel … then beep.  
DIAG  
ANALOG I / O CONFIGURATION  
NEXT ENTR  
PREV  
EXIT  
DIAG AIO CONC_OUT_2 D/A/ CAL ERROR  
EXIT  
DIAG AIO  
AIN CALIBRATED: NO  
EXIT  
SET> EDIT  
DIAG AIO CONC_OUT_2 CURR-Z: 0 mV  
U100 UP10 UP DOWN DN10 D100 ENTR EXIT  
Press SET> to select the analog output channel  
to be configured:.  
DIAG AIO CONC_OUT_2 ZERO: 27 mV  
Increase or decrease the current  
output by 100, 10 or 1 counts.  
The resulting change in output  
voltage is displayed in the upper  
line.  
U100 UP10 UP DOWN DN10 D100 ENTR EXIT  
DIAG AIO CONC_OUT_2:CURR, NO CAL  
< SET SET> EDIT  
EXIT  
Continue adjustments until the  
correct current is measured with  
the current meter.  
DIAG AIO CONC_OUT_2 SPAN: 10000 mV  
DIAG AIO CONC_OUT_2 RANGE: CURR  
U100 UP10 UP DOWN DN10 D100 ENTR EXIT  
<SET SET> EDIT  
EXIT  
EXIT  
DIAG AIO CONC_OUT_2 ZERO: 9731 mV  
EXIT ignores the  
new setting, ENTR  
accepts the new  
setting.  
DIAG AIO CONC_OUT_2 CALIBRATED: NO  
U100 UP10 UP DOWN DN10 D100 ENTR EXIT  
< SET  
CAL  
DIAG AIO CONC_OUT_2 CALIBRATED: YES  
DIAG AIO AUTO CALIBRATING CONC_OUT_2  
< SET  
CAL  
EXIT  
If a current meter is not available, an alternative method for calibrating the current loop outputs is to  
connect a 250   1% resistor across the current loop output. Using a voltmeter connected across the  
resistor, follow the procedure above but adjust the output to the following values:  
Table 6-21: Current Loop Output Calibration with Resistor  
Voltage for 2-20 mA  
(measured across resistor)  
Voltage for 4-20 mA  
(measured across resistor)  
Full scale  
0%  
0.5 V  
5.0 V  
1.0 V  
5.0 V  
100%  
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Operating Instructions  
6.13.4.5. AIN Calibration  
Model GFC7000TA Carbon Dioxide Analyzer  
This is the sub-menu to conduct the analog input calibration. This calibration should only be necessary  
after major repair such as a replacement of CPU, motherboard or power supplies. Activate the ANALOG  
I/O CONFIGURATION MENU (See Section 6.13.1), then press:  
STARTING FROM ANALOG I / O CONFIGURATION MENU  
Exit at any time to  
return to the main  
DIAG menu  
DIAG  
ANALOG I / O CONFIGURATION  
ENTR EXIT  
PREV  
NEXT  
Continue pressing SET? until …  
DIAG AIO  
AIN CALIBRATED: NO  
< SET SET> CAL  
EXIT  
DIAG AIO  
CALIBRATING A/D ZERO  
Instrument  
calibrates  
automatically  
CALIBRATING A/D SPAN  
Exit to return to the  
ANALOG I/O  
CONFIGURATION  
MENU  
DIAG AIO  
AIN CALIBRATED: YES  
< SET SET> CAL  
EXIT  
6.13.4.6. Configuring Analog Inputs (Option) Channels  
To configure the analyzer’s external analog inputs option, define for each channel:  
gain (number of units represented by 1 volt)  
offset (volts)  
engineering units to be represented in volts (each press of the touchscreen button  
scrolls the list of alphanumeric characters from A-Z and 0-9)  
whether to display the channel in the Test functions  
To access and adjust settings for the external Analog Inputs option channels press:  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
DIAG  
ANALOG I / O CONFIGURATION  
PREV  
NEXT  
ENTR  
EXIT  
EXIT  
DIAG AIO  
AOUTS CALIBRATED: NO  
Press SET> to scroll to the first  
channel. Continue pressing SET>  
to view each of 8 channels.  
< SET SET> CAL  
DIAG AIO  
XIN1:1.00,0.00,V,OFF  
Press EDIT at any channel  
< SET SET> EDIT  
EXIT  
to to change Gain, Offset,  
Units and whether to display  
the channel in the Test  
functions (OFF/ON).  
DIAG AIO  
XIN1 GAIN:1.00V/V  
SET> EDIT  
EXIT  
DIAG AIO  
XIN1 OFFSET:0.00V  
DIAG AIO  
XIN1 GAIN:1.00V/V  
< SET SET> EDIT  
EXIT  
+
0
0
1
.0  
0
ENTR EXIT  
DIAG AIO  
XIN1 UNITS:V  
Press to change  
Gain value  
< SET SET> EDIT  
EXIT  
EXIT  
DIAG AIO  
< SET  
XIN1 DISPLAY:OFF  
EDIT  
Pressing ENTR records the new setting  
and returns to the previous menu.  
Pressing EXIT ignores the new setting and  
returns to the previous menu.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13.5. Electric Test  
The electric test function substitutes simulated signals for CO2 MEAS and CO2 REF, generated by  
circuitry on the sync/demod board, for the output of the IR photo-detector. While in this mode the user  
can also view the same test functions viewable from the main SAMPLE display. When the test is  
running, the concentration reported on the front panel display should be 40.0 ppm.  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
SETUP X.X  
ENTER DIAG PASS: 818  
8
1
8
ENTR EXIT  
DIAG  
SIGNAL I / O  
NEXT  
ENTR  
EXIT  
Repeat Pressing NEXT unti . . .  
DIAG  
ELECTRIC TEST  
PREV NEXT  
ENTR  
EXIT  
DIAG ELEC  
RANGE=50.000 PPM  
CO2= 40.0  
EXIT  
Exit returns  
to the  
DIAG Menu  
<TST TST>  
Press <TST TST> to view Test Functions  
NOTE: CO2 MEAS and CO2 REF will be artificially altered  
to enforce a CO2 reading of 40.0 ppm.  
All other Test Functions will report the correct operational  
value  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13.6. Dark Calibration Test  
The dark calibration test interrupts the signal path between the IR photo-detector and the remainder of  
the sync/demod board circuitry. This allows the instrument to compensate for any voltage levels inherent  
in the sync/demod circuitry that might effect the calculation of CO2 concentration. Performing this  
calibration returns two offset voltages, One for CO2 MEAS and on for CO2 REF that are automatically  
added to the CPU’s calculation routine. The two offset voltages from the last calibration procedure may  
be reviewed by the user via the front panel display.  
To activate the dark calibration procedure or review the results of a previous calibration, press:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
DIAG  
SIGNAL I / O  
NEXT  
ENTR  
EXIT  
SETUP X.X  
SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
Repeat Pressing NEXT until . . .  
SETUP X.X  
ENTER DIAG PASS: 818  
DIAG  
DARK CALIBRATION  
8
1
8
ENTR EXIT  
PREV NEXT  
ENTR  
EXIT  
DIAG DARK  
CO2 DARK CALIBRATION  
Exit returns  
to the  
previous menu  
VIEW CAL  
EXIT  
Calibration runs automatically  
Electric offset for Reference signal  
Display  
tracks %  
complete  
DIAG DARK  
REF DARK OFFSET: 0.0 mV  
DIAG DARK  
DARK CAL 1% COMPLETE  
EXIT  
EXIT  
EXIT  
EXIT  
Electric offset for Measurement signal  
DIAG DARK  
MEAS DARK OFFSET: 0.0 mV  
DIAG DARK  
DARK CALIBRATION ABORTED  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13.7. Pressure Calibration  
A sensor at the exit of the sample chamber continuously measures the pressure of the sample gas. This  
data is used to compensate the final CO2 concentration calculation for changes in atmospheric pressure  
and is stored in the CPU’s memory as the test function PRES (also viewable via the front panel).  
NOTE  
This calibration must be performed when the pressure of the sample gas is equal  
to ambient atmospheric pressure.  
Before performing the following pressure calibration procedure, disconnect the  
sample gas pump and the sample gas-line vent from the sample gas inlet on the  
instrument’s rear panel.  
To cause the analyzer to measure and record a value for PRES, press.  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
Exit at  
any time  
to return  
to main  
the  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP  
menu  
SETUP X.X  
SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
SETUP X.X  
ENTER DIAG PASS: 818  
8
1
8
ENTR EXIT  
DIAG  
SIGNAL I / O  
NEXT  
ENTR  
EXIT  
Repeat Pressing NEXT until . . .  
ENTR accepts the  
new value and  
returns to the  
DIAG PCAL ACTUAL PRESS : 27.20 IN-HG-A  
previous menu  
EXIT ignores the  
new value and  
returns to the  
2
7
.2  
0
ENTR EXIT  
Adjust these values until the  
displayed pressure equals the  
pressure measured by the  
independent pressure meter.  
previous menu  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13.8. Flow Calibration  
The flow calibration allows the user to adjust the values of the sample flow rates as they are displayed on  
the front panel and reported through COM ports to match the actual flow rate measured at the sample  
inlet. This does not change the hardware measurement of the flow sensors, only the software calculated  
values.  
To carry out this adjustment, connect an external, sufficiently accurate flow meter to the sample inlet (see  
Section 11 for more details). Once the flow meter is attached and is measuring actual gas flow, press:  
SAMPLE  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG ACAL DAS RNGE PASS CLK MORE EXIT  
Exit at  
any time  
to return  
to main  
the  
SETUP X.X  
SECONDARY SETUP MENU  
COMM VARS DIAG  
EXIT  
SETUP  
menu  
SETUP X.X  
ENTER DIAG PASS: 818  
8
1
8
ENTR EXIT  
DIAG  
SIGNAL I / O  
NEXT  
ENTR EXIT  
Adjust these values until  
the displayed flow rate  
equals the flow rate being  
measured by the  
independent flow meter.  
Repeat Pressing NEXT until . . .  
DIAG  
FLOW CALIBRATION  
Exit returns  
to the  
PREV NEXT  
ENTR EXIT  
previous menu  
DIAG FCAL  
ACTUAL FLOW: 654 CC / M  
ENTR EXIT  
Adjust these values  
until the displayed  
flow rate equals the  
flow rate being  
measured by the  
independent flow  
meter.  
ENTR accepts the  
new value and  
returns to the  
previous menu  
EXIT ignores the  
new value and  
returns to the  
0
6
5
4
previous menu  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.13.9. Test Channel Output  
When activated, output channel A4 can be used to report one of the test functions viewable from the  
SAMPLE mode display. To activate the A4 channel and select a test function, follow this button  
sequence:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
Continue to press NEXT until …  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X SECONDARY SETUP MENU  
DIAG  
TEST CHAN OUTPUT  
COMM VARS DIAG ALRM  
PREV  
NEXT  
ENTR  
EXIT  
SETUP X.X  
ENTER DIAG PASS: 818  
DIAG TCHN  
TEST CHANNEL: NONE  
8
1
8
ENTR EXIT  
NEXT  
ENTR  
EXIT  
DIAG  
SIGNAL I / O  
DIAG TCHN TEST CHANNEL: CO2 MEASURE  
PREV NEXT ENTR  
NEXT  
ENTR EXIT  
ENTR EXIT  
EXIT  
DIAG  
ANALOG OUTPUT  
PREV NEXT  
Press PREV or NEXT  
to move through the  
list of available  
parameters  
Press ENTR to select  
Press EXIT to  
return to the  
DIAG menu  
the displayed  
parameter activating  
the test channel.  
(Table 6-13)  
Table 6-22: Test Parameters Available for Analog Output A4  
TEST CHANNEL  
ZERO  
FULL SCALE  
NONE  
Test Channel is turned off  
CO2 MEASURE  
CO2 REFERENCE  
SAMPLE PRESS  
SAMPLE FLOW  
SAMPLE TEMP  
BENCH TEMP  
WHEEL TEMP  
CHASSIS TEMP  
PHT DRIVE  
0 mV  
0 mV  
5000 mV*  
5000 mV*  
40 "Hg  
0 "Hg  
0 cc/m  
1000 cc/m  
0C  
0C  
70C  
70C  
0C  
70C  
0C  
70C  
0 mV  
5000 mV  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
* This refers to the internal voltage level of the function NOT the output signal level  
of the Test channel itself.  
6.14. SETUP MORE ALRM: Using the Gas Concentration  
Alarms  
The Model GFC 7000TA includes two CO2 concentration alarms. Each alarm has a user settable limit,  
and is associated with an opto-isolated TTL relay accessible via the status output connector on the  
instrument’s back panel (See Section 6.15.1.1). If the CO2 concentration measured by the instrument  
rises above that limit, the alarm‘s status output relay is closed.  
The default settings for ALM1 and ALM2 are:  
Table 6-23: CO2 Concentration Alarm Default Settings  
1
ALARM  
STATUS  
LIMIT SET POINT  
100 ppm  
ALM1  
ALM2  
Disabled  
Disabled  
300 ppm  
1
Set points listed are for PPM. Should the reporting range units of measure be changed (See Section 6.7.6) the  
analyzer will automatically scale the set points to match the new range unit setting.  
Note  
To prevent the concentration alarms from activating during span calibration  
operations make sure to press CAL or CALS button prior to introducing span gas  
into the analyzer.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.14.1. Setting the Concentration Alarm Limits  
To enable either of the CO2 concentration alarms and set the Limit points, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
ALARM MENU  
SETUP X.X  
PRIMARY SETUP MENU  
ALM1 ALM2  
EXIT  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.  
ALARM 1 LIMIT: OFF  
ALARM 1 LIMIT: ON  
SETUP X.X SECONDARY SETUP MENU  
OFF  
ENTR EXIT  
COMM VARS DIAG ALRM  
SETUP X.  
ON  
ENTR EXIT  
Toggle these buttons to  
scroll through the  
available character set:  
0-9  
SETUP X.  
ALARM 1 LIMIT: 200.00 PPM  
.0 ENTR EXIT  
ENTR accepts the new  
settings  
EXIT ignores the new  
0
1
0
0
0
settings  
6.15. Remote Operation of the Analyzer  
6.15.1. Remote Operation Using the External Digital I/O  
6.15.1.1. Status Outputs  
The status outputs report analyzer conditions via optically isolated NPN transistors, which sink up to 50  
mA of DC current. These outputs can be used interface with devices that accept logic-level digital inputs,  
such as programmable logic controllers (PLC’s). Each Status bit is an open collector output that can  
withstand up to 40 VDC. All of the emitters of these transistors are tied together and available at D.  
NOTE  
Most PLC’s have internal provisions for limiting the current that the input will draw  
from an external device. When connecting to a unit that does not have this  
feature, an external dropping resistor must be used to limit the current through  
the transistor output to less than 50 mA. At 50 mA, the transistor will drop  
approximately 1.2V from its collector to emitter.  
The status outputs are accessed via a 12-pin connector on the analyzer’s rear panel labeled STATUS.  
The function of each pin is defined in Table 6–24.  
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STATUS  
1
2
3
4
5
6
7
8
D
+
Figure 6-13:  
Status Output Connector  
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The pin assignments for the Status Outputs are:  
Table 6-24: Status Output Pin Assignments  
OUTPUT #  
Status Definition  
Condition  
1
2
SYSTEM OK  
On if no faults are present.  
On if CO2 concentration measurement is valid.  
CONC VALID  
If the CO2 concentration measurement is invalid, this bit is OFF.  
On if unit is in high range of DUAL or AUTO range modes.  
On whenever the instruments zero point is being calibrated.  
On whenever the instruments span point is being calibrated.  
On whenever the instrument is in diagnostic mode.  
3
4
5
6
HIGH RANGE  
ZERO CAL  
SPAN CAL  
DIAG MODE  
On whenever the measured CO2 concentration is above the set point for  
ALM1  
7
8
ALARM1  
ALARM2  
On whenever the measured CO2 concentration is above the set point for  
ALM2  
D
+
EMITTER BUS  
DC POWER  
The emitters of the transistors on pins 1-8 are bused together.  
+ 5 VDC  
Digital Ground  
The ground level from the analyzer’s internal DC power supplies.  
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6.15.1.2. Control Inputs  
Model GFC7000TA Carbon Dioxide Analyzer  
These inputs allow the user to remotely initiate Zero and Span calibrations. Two methods for energizing  
the inputs is provided below; the first using the internal +5V available on the CONTROL IN connector and  
the second, if an external, isolated supply is employed.  
Table 6-25: Control Input Pin Assignments  
INPUT  
STATUS  
CONDITION WHEN ENABLED  
EXTERNAL ZERO  
CAL  
Zero calibration mode is activated. The mode field of the display will  
read ZERO CAL R.  
A
EXTERNAL SPAN  
CAL  
Span calibration mode is activated. The mode field of the display will  
read SPAN CAL R.  
B
C
D
E
F
Unused  
Unused  
Unused  
Unused  
DIGITAL GROUND  
Provided to ground an external device (e.g., recorder).  
DC power for Input  
pull ups  
Input for +5 VDC required to activate inputs A - F. This voltage can be  
taken from an external source or from the “+” pin.  
U
+
Internal source of +5V which can be used to activate inputs when  
connected to pin U.  
Internal +5V Supply  
There are two methods to activate control inputs. The internal +5V available from the “+” pin is the most  
convenient method (Figure 6-18). However, to ensure that these inputs are truly isolated, a separate,  
external 5 VDC power supply should be used.  
CONTROL IN  
CONTROL IN  
A
B
C
D
E
F
U
+
A
B
C
D
E
F
U
+
Z
E
R
O
S
P
A
N
Z
E
R
O
S
P
A
N
5 VDC Power  
Supply  
+
-
External Power Connections  
Local Power Connections  
Figure 6-14:  
Control Inputs  
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6.15.2. Remote Operation Using the External Serial I/O  
6.15.2.1. Terminal Operating Modes  
The Model GFC 7000TA can be remotely configured, calibrated or queried for stored data through the  
serial ports. As terminals and computers use different communication schemes, the analyzer supports  
two communicate modes specifically designed to interface with these two types of devices.  
Computer mode is used when the analyzer is connected to a computer with a dedicated interface  
program such as APICOM. More information regarding APICOM can be found in later in this or on  
the Teledyne Instruments website at http://www.teledyne-api.com/software/apicom/.  
Interactive mode is used with a terminal emulation programs such as HyperTerminal or a “dumb”  
computer terminal. The commands that are used to operate the analyzer in this mode are listed in  
Table 6-26.  
6.15.2.2. Help Commands in Terminal Mode  
Table 6-26: Terminal Mode Software Commands  
COMMAND  
Control-T  
Function  
Switches the analyzer to terminal mode (echo, edit). If mode flags 1 & 2 are OFF, the interface  
can be used in interactive mode with a terminal emulation program.  
Control-C  
Switches the analyzer to computer mode (no echo, no edit).  
CR  
A carriage return is required after each command line is typed into the terminal/computer. The  
command will not be sent to the analyzer to be executed until this is done. On personal  
computers, this is achieved by pressing the ENTER button.  
(carriage return)  
BS  
Erases one character to the left of the cursor location.  
(backspace)  
ESC  
Erases the entire command line.  
(escape)  
? [ID] CR  
This command prints a complete list of available commands along with the definitions of their  
functionality to the display device of the terminal or computer being used. The ID number of  
the analyzer is only necessary if multiple analyzers are on the same communications line, such  
as the multi-drop setup.  
Control-C  
Control-P  
Pauses the listing of commands.  
Restarts the listing of commands.  
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6.15.2.3. Command Syntax  
Commands are not case-sensitive and all arguments within one command (i.e. ID numbers, keywords,  
data values, etc.) must be separated with a space character.  
All Commands follow the syntax:  
X [ID] COMMAND <CR>  
Where  
X
is the command type (one letter) that defines the type of command. Allowed  
designators are listed in Table 6-27 and Appendix A-6.  
[ID]  
is the analyzer identification number (Section 6.11.1.). Example: the Command “?  
200” followed by a carriage return would print the list of available commands for the  
revision of software currently installed in the instrument assigned ID Number 200.  
COMMAND is the command designator: This string is the name of the command being issued  
(LIST, ABORT, NAME, EXIT, etc.). Some commands may have additional  
arguments that define how the command is to be executed. Press ? <CR> or refer  
to Appendix A-6 for a list of available command designators.  
<CR>  
is a carriage return. All commands must be terminated by a carriage return (usually  
achieved by pressing the ENTER button on a computer).  
Table 6-27: Command Types  
COMMAND  
COMMAND TYPE  
Calibration  
Diagnostic  
C
D
L
Logon  
T
Test measurement  
Variable  
V
W
Warning  
6.15.2.4. Data Types  
Data types consist of integers, hexadecimal integers, floating-point numbers, Boolean expressions and  
text strings.  
Integer data are used to indicate integral quantities such as a number of records, a filter length, etc.  
They consist of an optional plus or minus sign, followed by one or more digits. For example, +1, -12,  
123 are all valid integers.  
Hexadecimal integer data are used for the same purposes as integers. They consist of the two  
characters “0x,” followed by one or more hexadecimal digits (0-9, A-F, a-f), which is the ‘C’  
programming language convention. No plus or minus sign is permitted. For example, 0x1, 0x12,  
0x1234abcd are all valid hexadecimal integers.  
Floating point numbers are used to specify continuously variable values such as temperature set  
points, time intervals, warning limits, voltages, etc. They consist of an optional plus or minus sign,  
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followed by zero or more digits, an optional decimal point, and zero or more digits. (At least one digit  
must appear before or after the decimal point.) Scientific notation is not permitted. For example, +1.0,  
1234.5678, -0.1, 1 are all valid floating-point numbers.  
Boolean expressions are used to specify the value of variables or I/O signals that may assume only  
two values. They are denoted by the keywords ON and OFF.  
Text strings are used to represent data that cannot be easily represented by other data types, such  
as data channel names, which may contain letters and numbers. They consist of a quotation mark,  
followed by one or more printable characters, including spaces, letters, numbers, and symbols, and a  
final quotation mark. For example, “a”, “1”, “123abc”, and “()[]<>” are all valid text strings. It is not  
possible to include a quotation mark character within a text string.  
Some commands allow you to access variables, messages, and other items, such as DAS data  
channels, by name. When using these commands, you must type the entire name of the item; you  
cannot abbreviate any names.  
6.15.2.5. Status Reporting  
Reporting of status messages as an audit trail is one of the three principal uses for the RS-232 interface  
(the other two being the command line interface for controlling the instrument and the download of data in  
electronic format). You can effectively disable the reporting feature by setting the interface to quiet mode  
(Section 6.11.5., Table 6-10).  
Status reports include DAS data (when reporting is enabled), warning messages, calibration and  
diagnostic status messages. Refer to Appendix A-3 for a list of the possible messages, and this for  
information on controlling the instrument through the RS-232 interface.  
General Message Format  
All messages from the instrument (including those in response to a command line request) are in the  
format:  
X DDD:HH:MM [Id] MESSAGE<CRLF>  
Where:  
X
is a command type designator, a single character indicating the message type,  
as shown in the Table 6-27.  
DDD:HH:MM is the time stamp, the date and time when the message was issued. It consists of  
the Day-of-year (DDD) as a number from 1 to 366, the hour of the day (HH) as a  
number from 00 to 23, and the minute (MM) as a number from 00 to 59.  
[ID]  
is the analyzer ID, a number with 1 to 4 digits.  
MESSAGE  
is the message content that may contain warning messages, test  
measurements, DAS reports, variable values, etc.  
<CRLF>  
is a carriage return / line feed pair, which terminates the message.  
The uniform nature of the output messages makes it easy for a host computer to parse them into an easy  
structure. Keep in mind that the front panel display does not give any information on the time a message  
was issued, hence it is useful to log such messages for trouble-shooting and reference purposes.  
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Terminal emulation programs such as HyperTerminal can capture these messages to text files for later  
review.  
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6.15.2.6. Remote Access by Modem  
The GFC 7000TA can be connected to a modem for remote access. This requires a cable between the  
analyzer’s COM port and the modem, typically a DB-9F to DB-25M cable (available from Teledyne  
Instruments with part number WR0000024).  
Once the cable has been connected, check to make sure the DTE-DCE is in the correct position. Also  
make sure the GFC 7000TA COM port is set for a baud rate that is compatible with the modem, which  
needs to operate with an 8-bit word length with one stop bit.  
The first step is to turn on the MODEM ENABLE communication mode (Mode 64, Section 6.11.5). Once  
this is completed, the appropriate setup command line for your modem can be entered into the analyzer.  
The default setting for this feature is  
AT Y0 &D0 &H0 &I0 S0=2 &B0 &N6 &M0 E0 Q1 &W0  
This string can be altered to match your modem’s initialization and can be up to 100 characters long.  
To change this setting press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
SET> EDIT  
COM1 MODE:0  
EXIT  
EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X  
COM1 BAUD RATE:19200  
<SET SET> EDIT  
EXIT returns to  
the previous  
menu  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
SETUP X.X  
COM1 MODEM INIT:AT Y&D&H  
EXIT  
<SET SET> EDIT  
SETUP X.X  
COMMUNICATIONS MENU  
ENTR accepts the  
new string and returns  
to the previous menu.  
EXIT ignores the new  
string and returns to  
the previous menu.  
ID INET COM1 COM2  
EXIT  
SETUP X.X  
COM1 MODEM INIT:[A]T Y&D&H  
ENTR EXIT  
<CH CH> INS DEL [A]  
Press the [?]  
key repeatedly to cycle through the  
available character set:  
0-9  
INS inserts a  
character before  
the cursor location.  
DEL deletes a  
character at the  
cursor location.  
A-Z  
<CH and CH> move the [ ]  
cursor left and right along the  
text string  
space ’ ~ ! # $ % ^ & * ( ) - _ =  
+[ ] { } < >\ | ; : , . / ?  
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To initialize the modem press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
SET> EDIT  
COM1 MODE:0  
EXIT  
EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
SETUP X.X  
COM1 BAUD RATE:19200  
EXIT returns to  
the previous  
menu  
<SET SET> EDIT  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
EXIT  
SETUP X.X  
COM1 MODEM INIT:AT Y&D&H  
SETUP X.X  
COMMUNICATIONS MENU  
<SET SET> EDIT  
EXIT  
ID INET COM1 COM2  
EXIT  
SETUP X.X  
COM1 INITIALIZE MODEM  
EXIT  
<SET SET> INIT  
SETUP X.X  
INITIALIZING MODEM  
<SET SET> INIT  
EXIT  
EXIT returns to the  
Communications Menu.  
6.15.2.7. COM Port Password Security  
In order to provide security for remote access of the GFC 7000TA, a LOGON feature can be enabled to  
require a password before the instrument will accept commands. This is done by turning on the  
SECURITY MODE (Mode 4, Section 6.11.5). Once the SECURITY MODE is enabled, the following items  
apply.  
A password is required before the port will respond or pass on commands.  
If the port is inactive for one hour, it will automatically logoff, which can also be achieved with the  
LOGOFF command.  
Three unsuccessful attempts to log on with an incorrect password will cause subsequent logins to be  
disabled for 1 hour, even if the correct password is used.  
If not logged on, the only active command is the '?' request for the help screen.  
The following messages will be returned at logon:  
LOGON SUCCESSFUL - Correct password given  
LOGON FAILED - Password not given or incorrect  
LOGOFF SUCCESSFUL - Connection terminated successfully  
To log on to the Model GFC 7000TA analyzer with SECURITY MODE feature enabled, type:  
LOGON 940331  
940331 is the default password. To change the default password, use the variable RS232_PASS issued  
as follows:  
V RS232_PASS=NNNNNN  
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Where N is any numeral between 0 and 9.  
6.15.2.8. APICOM Remote Control Program  
APICOM is an easy-to-use, yet powerful interface program that allows accessing and controlling any of  
Teledyne Instruments’ main line of ambient and stack-gas instruments from a remote connection through  
direct cable, modem or Ethernet. Running APICOM, a user can:  
Establish a link from a remote location to the GFC 7000TA through direct cable connection via RS-232  
modem or Ethernet.  
View the instrument’s front panel and remotely access all functions that could be accessed when  
standing in front of the instrument.  
Remotely edit system parameters and set points.  
Download, view, graph and save data for predictive diagnostics or data analysis.  
Retrieve, view, edit, save and upload DAS configurations.  
Check on system parameters for trouble-shooting and quality control.  
APICOM is very helpful for initial setup, data analysis, maintenance and trouble-shooting. Figure 6-5  
shows an example of APICOM being used to remotely configuration the instruments DAS feature. Figure  
6-19 shows examples of APICOM’s main interface, which emulates the look and functionality of the  
instruments actual front panel  
Figure 6-15:  
APICOM Remote Control Program Interface  
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APICOM is included free of cost with the analyzer and the latest versions can also be downloaded for free  
at http://www.teledyne-api.com/software/apicom/.  
6.15.3. Additional Communications Documentation  
Table 6-28: Serial Interface Documents  
INTERFACE / TOOL  
DOCUMENT TITLE  
PART  
AVAILABLE ONLINE*  
NUMBER  
APICOM  
APICOM User Manual  
Detailed description of the DAS.  
039450000  
028370000  
YES  
YES  
DAS Manual  
* These documents can be downloaded at http://www.teledyne-api.com/manuals/  
6.15.4. Using the GFC 7000TA with a Hessen Protocol Network  
6.15.4.1. General Overview of Hessen Protocol  
The Hessen protocol is a multidrop protocol, in which several remote instruments are connected via a  
common communications channel to a host computer. The remote instruments are regarded as slaves of  
the host computer. The remote instruments are unaware that they are connected to a multidrop bus and  
never initiate Hessen protocol messages. They only respond to commands from the host computer and  
only when they receive a command containing their own unique ID number.  
The Hessen protocol is designed to accomplish two things: to obtain the status of remote instruments,  
including the concentrations of all the gases measured; and to place remote instruments into zero or span  
calibration or measure mode. TAI’s implementation supports both of these principal features.  
The Hessen protocol is not well defined, therefore while TAI’s application is completely compatible with  
the protocol itself, it may be different from implementations by other companies.  
The following subs describe the basics for setting up your instrument to operate over a Hessen Protocol  
network. For more detailed information as well as a list of host computer commands and examples of  
command and response message syntax, download the Manual Addendum for Hessen Protocol from the  
Teledyne Instruments web site: http://www.teledyne-api.com/manuals/index.asp .  
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6.15.4.2. Hessen com Port Configuration  
Hessen protocol requires the communication parameters of the GFC 7000TA’s com ports to be set  
differently than the standard configuration as shown in the table below.  
Table 6-29: RS-232 Communication Parameters for Hessen Protocol  
Parameter  
Data Bits  
Stop Bits  
Parity  
Standard  
Hessen  
7
8
1
2
None  
Full  
Even  
Half  
Duplex  
To change the rest of the com port parameters. See Section 6.11.5.  
To change the baud rate of the GFC 7000TA’s com ports, See Section 6.11.8.  
NOTE  
Make sure that the communication parameters of the host computer are also  
properly set.  
Also, the instrument software has a 200 ms. Latency before it responds to  
commands issued by the host computer. This latency should present no problems,  
but you should be aware of it and not issue commands to the instrument too  
frequently.  
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6.15.4.3. Activating Hessen Protocol  
The first step in configuring the GFC 7000TA to operate over a Hessen protocol network is to activate the  
Hessen mode for com ports and configure the communication parameters for the port(s) appropriately.  
Press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP X.X  
COM1 QUIET MODE: OFF  
ENTR EXIT  
Repeat the entire  
process to set up  
the COM2 port  
< TST TST > CAL  
SETUP  
NEXT OFF  
SETUP X.X  
PRIMARY SETUP MENU  
Continue pressing next until …  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
EXIT  
EXIT  
SETUP X.X COM1 HESSEN PROTOCOL : OFF  
SETUP X.X SECONDARY SETUP MENU  
PREV NEXT OFF  
ENTR EXIT  
COMM VARS DIAG  
ALRM  
Toggle OFF/ON to  
change  
activate/deactivate  
SETUP X.X COM1 HESSEN PROTOCOL : ON  
SETUP X.X  
COMMUNICATIONS MENU  
Select which COMM  
port to configure  
selected mode.  
PREV NEXT ON  
ENTR EXIT  
ID INET COM1 COM2  
The sum of the mode  
IDs of the selected  
SETUP X.X  
COM1 E,7,1MODE: OFF  
SETUP X.X  
SET> EDIT  
COM1 MODE:0  
modes is displayed here  
PREV NEXT OFF  
ENTR EXIT  
ENTR accepts the new  
SETUP X.X  
COM1 E,7,1 MODE: ON  
settings  
EXIT ignores the new  
PREV NEXT ON  
ENTR EXIT  
settings  
6.15.4.4. Selecting a Hessen Protocol Type  
Currently there are two versions of Hessen Protocol in use. The original implementation, referred to as  
TYPE 1, and a more recently released version, TYPE 2 that has more flexibility when operating with  
instruments that can measure more than one type of gas. For more specific information about the  
difference between TYPE 1and TYPE 2 download the Manual Addendum for Hessen Protocol from the  
Teledyne Instruments web site: http://www.teledyne-api.com/manuals/index.asp .  
To select a Hessen Protocol Type press:  
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SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
COMMUNICATIONS MENU  
SETUP X.X  
PRIMARY SETUP MENU  
ID INET HESN COM1 COM2  
EXIT  
EXIT  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.  
HESSEN VARIATION: TYPE 1  
SETUP X.X SECONDARY SETUP MENU  
SET> EDIT  
COMM VARS DIAG ALRM  
ENTR accepts the new  
settings  
SETUP X.X HESSEN VARIATION: TYPE 1  
TYE1 TYPE 2 ENTR EXIT  
EXIT ignores the new  
settings  
SETUP X.X HESSEN VARIATION: TYPE 2  
Press to change  
protocol type.  
PREV NEXT OFF  
ENTR EXIT  
NOTE  
While Hessen Protocol Mode can be activated independently for COM1 and COM2,  
The TYPE selection affects both Ports.  
6.15.4.5. Setting The Hessen Protocol Response Mode  
The Teledyne Instruments implementation of Hessen Protocol allows the user to choose one of several  
different modes of response for the analyzer.  
Table 6-30: Teledyne Instruments Hessen Protocol Response Modes  
MODE ID  
CMD  
MODE DESCRIPTION  
This is the Default Setting. Reponses from the instrument are encoded as the traditional command  
format. Style and format of responses depend on exact coding of the initiating command.  
Responses from the instrument are always delimited with <STX> (at the beginning of the response,  
<ETX> (at the end of the response followed by a 2 digit Block Check Code (checksum), regardless  
of the command encoding.  
BCC  
Responses from the instrument are always delimited with <CR> at the beginning and the end of the  
string, regardless of the command encoding.  
TEXT  
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To Select a Hessen response mode, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
COMMUNICATIONS MENU  
ID INET HESN COM1 COM2  
EXIT  
EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X  
HESSEN VARIATION: TYPE 1  
SET> EDIT  
SETUP X.X SECONDARY SETUP MENU  
ENTR accepts the new  
settings  
COMM VARS DIAG ALRM  
EXIT ignores the new  
SETUP X.X  
HESSEN RESPONSE MODE :CMD  
settings  
<SET SET> EDIT  
EXIT  
Press to  
change  
response  
mode.  
SETUP X.X  
HESSEN RESPONSE MODE :CMD  
BCC TEXT EDIT  
ENTR EXIT  
6.15.4.6. Hessen Protocol Gas ID  
The Model GFC 7000TA Analyzer is a single gas instrument that measures CO2. As such it’s default gas  
ID has already been set to 310. There is no need to change this setting.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
6.15.4.7. Setting Hessen Protocol Status Flags  
Teledyne Instruments’ implementation of Hessen protocols includes a set of status bits that the  
instrument includes in responses to inform the host computer of its condition. Each bit can be assigned  
to one operational and warning message flag. The default settings for these bit/flags are:  
Table 6-31: Default Hessen Status Bit Assignments  
STATUS FLAG NAME  
DEFAULT BIT  
ASSIGNMENT  
WARNING FLAGS  
SAMPLE FLOW WARNING  
BENCH TEMP WARNING  
SOURCE WARNING  
0001  
0002  
0004  
0008  
0010  
0020  
0040  
0080  
BOX TEMP WARNING  
WHEEL TEMP WARNING  
SAMPLE TEMP WARNING  
SAMPLE PRESSURE WARNING  
INVALID CONC  
(The Instrument’s Front Panel Display Will Show The  
Concentration As “XXXX”)  
OPERATIONAL FLAGS  
Instrument Off  
0100  
0200  
0400  
0800  
In Manual Calibration Mode  
In Zero Calibration Mode  
In Span Calibration Mode  
UNITS OF MEASURE FLAGS  
UGM  
0000  
2000  
MGM  
PPB  
4000  
PPM  
6000  
SPARE/UNUSED BITS  
UNASSIGNED FLAGS (0000)  
100, 1000, 8000  
Sync Warning  
Relay Board Warning  
Conc Alarm 1  
Analog Cal Warning  
Cannot Dyn Zero  
Cannot Dyn Span  
Invalid Conc  
Conc Alarm 2  
Photo Temp Warning  
System Reset  
Rear Board Not Detected  
NOTES:  
It is possible to assign more than one flag to the same Hessen status bit. This  
allows the grouping of similar flags, such as all temperature warnings, under the  
same status bit.  
Be careful not to assign conflicting flags to the same bit as each status bit will be  
triggered if any of the assigned flags is active.  
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Operating Instructions  
Model GFC7000TA Carbon Dioxide Analyzer  
To assign or reset the status flag bit assignments, press:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG ALRM  
SETUP X.X  
COMMUNICATIONS MENU  
ID INET HESN COM1 COM2  
EXIT  
Repeat pressing SET> until …  
SETUP X.  
HESSEN STATUS FLAGS  
<SET SET> EDIT  
EXIT  
SETUP X.  
SYNC WARNING: 0000  
PREV NEXT  
EDIT PRNT EXIT  
Repeat pressing NEXT or PREV until the desired  
message flag is displayed. See Table 6-27.  
For xxample …  
SETUP X.  
SYSTEM RESET: 0000  
EDIT PRNT EXIT  
PREV NEXT  
<CH and CH>  
move the [ ]  
cursor left and  
right along the  
bit string.  
SETUP X.  
SYSTEM RESET: [0]000  
[0]  
ENTR accepts the new  
settings  
<CH CH>  
ENTR EXIT  
EXIT ignores the new  
settings  
Press the [?] key repeatedly to cycle through the available character set: 0-9  
Note: Values of A- F can also be set but are meaningless.  
6.15.4.8. Instrument ID Code  
Each instrument on a Hessen Protocol network must have a unique ID code. The GFC 7000TA is  
programmed with a default ID code of 360. To change this code See Section 6.11.1  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
7. CALIBRATION PROCEDURES  
This contains a variety of information regarding the various methods for calibrating a Model GFC 7000TA  
CO2 Analyzer as well as other supporting information.  
NOTE  
The procedures in this assume that the calibration password feature is disabled  
(the instruments default state). If it is enabled a password prompt screen (See  
Section 6.9) will appear after the CAL, CALZ or CALS buttons are pushed but before  
the instrument enters the associated calibration mode.  
7.1. Before Calibration  
The calibration procedures in this assume that the Range Type, Range Span and units of measure have  
already been selected for the analyzer. If this has not been done, please do so before continuing (See  
Section 6.8 for instructions).  
All Gas lines should be PTFE (Teflon), FEP, glass, stainless steel or brass.  
NOTE  
If any problems occur while performing the following calibration procedures, refer  
to Section 11 of this manual for troubleshooting tips.  
7.1.1. Zero Air and Span Gas  
To perform the following calibration you must have sources for zero air and span gas available.  
Zero Air is similar in chemical composition to the Earth’s atmosphere but scrubbed of all components that  
might affect the analyzer’s readings. Zero air should contain less than 25 ppb of CO2 and other major  
interfering gases such as CO and Water Vapor. It should have a dew point of -5C or less  
Span Gas is a gas specifically mixed to match the chemical composition of the type of gas being  
measured at near full scale of the desired measurement range. It is recommended that the span gas  
used have a concentration equal to 80% of the full measurement range.  
If Span Gas is sourced directly from a calibrated, pressurized tank, the gas mixture should be CO2 mixed  
with Zero Air or N2 at the required ratio.  
Zero air generators that condition ambient air by drying and removal of pollutants are available on the  
commercial market such as the Teledyne Instruments Model 701 Zero Air Generator. We recommend  
this type of device, in conjunction with bottled N2 for generating zero air.  
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Calibration Procedures  
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7.1.2. Calibration Gas Traceability  
All equipment used to produce calibration gases should be verified against standards of the National  
Institute for Standards and Technology (NIST). To ensure NIST traceability, we recommend acquiring  
cylinders of working gas that are certified to be traceable to NIST Standard Reference Materials (SRM).  
These are available from a variety of commercial sources.  
7.1.3. Data Recording Devices  
A strip chart recorder, data acquisition system or digital data acquisition system should be used to record  
data from the GFC 7000TA’s serial or analog outputs. If analog readings are used, the response of the  
recording system should be checked against a NIST traceable voltage source or meter. Data recording  
device should be capable of bi-polar operation so that negative readings can be recorded. For electronic  
data recording, the GFC 7000TA provides an internal data acquisition system (DAS), which is described  
in detail in Section 6.7.  
7.2. Manual Calibration without Zero/Span Valves  
This is the basic method for manually calibrating the Model GFC 7000TA CO2 Analyzer without  
functioning zero/span valve options. It is identical to the method described in the GETTING STARTED  
(Section 3) of this manual and is repeated her for you convenience.  
STEP ONE: Connect the Sources of Zero Air and Span Gas as shown below.  
Figure 7-1:  
Pneumatic Connections–Basic Configuration–Using Bottled Span Gas  
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Calibration Procedures  
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Figure 7-2:  
Pneumatic Connections–Basic Configuration–Using Gas Dilution Calibrator  
STEP TWO: Set the expected CO2 Span Gas concentration:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP  
< TST TST > CAL  
This sequence causes the  
analyzer to prompt for the  
expected CO2 span  
concentration.  
M-P CAL  
RANGE = 500.000 PPM  
CO2 =X.XXX  
EXIT  
< TST TST > ZERO  
CONC  
The CO2 span  
concentration values  
automatically default to  
400.0 Conc.  
EXIT ignores the new setting  
and returns to the previous  
display.  
ENTR accepts the new setting  
and returns to the  
M-P CAL  
CO2 SPAN CONC: 400.000 Conc  
To change this value to  
the actual concentration of  
the span gas, enter the  
number by pressing the  
button under each digit  
until the expected value  
appears.  
0
0
0
4
5
.0  
ENTR EXIT  
previous display..  
NOTE  
For this Initial Calibration it is important to independently verify the PRECISE CO2 Concentration  
Value of the SPAN gas.  
If the source of the Span Gas is from a Calibrated Bottle, use the exact concentration value  
printed on the bottle.  
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Calibration Procedures  
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STEP THREE: Perform the Zero/Span Calibration Procedure:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =XXX.X  
SETUP  
Set the Display to show the  
STABIL test function.  
This function calculates the  
stability of the CO2  
< TST TST > CAL  
measurement  
SAMPLE  
STABIL=XXX.X PPM  
CO2 =XXX.X  
SETUP  
< TST TST > CAL  
ACTION:  
Allow zero gas to enter the sample port at the  
rear of the instrument.  
Wait until STABIL  
falls below 1.0 ppm.  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > CAL  
SETUP  
M-P CAL  
STABIL=XXX.X PPM  
CONC  
CO2 =XXX.X  
EXIT  
< TST TST > ZERO  
Press ENTR to changes the  
OFFSET & SLOPE values for the  
CO2 measurements.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > ENTR  
CONC  
EXIT  
Press EXIT to leave the calibration  
unchanged and return to the  
previous menu.  
ACTION:  
Allow span gas to enter the sample port at the  
rear of the instrument.  
The value of  
STABIL may jump  
si gni fi cantly.  
Wait until it falls back  
below 1.0 ppm  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
EXIT  
The SPAN button  
appears.  
< TST TST >  
M-P CAL  
SPAN CONC  
If eitherthe ZERO or  
SPAN buttons fail to  
appear see Section 11  
for troubleshooting tips.  
Press ENTR to change the  
OFFSET & SLOPE values for the  
CO2 measurements.  
RANGE = 500.000 PPM CO2 =XXX.X  
EXIT  
Press EXIT to leave the calibration  
unchanged and return to the  
previous menu.  
< TST TST > ENTR SPAN CONC  
M-P CAL  
RANGE = 500.000 PPM CO2 =XXX.X  
CONC EXIT  
EXIT returns to the main  
SAMPLE display  
< TST TST > ENTR  
If the ZERO or SPAN buttons are not displayed, this means that the measurement made during that part  
of the procedure is too far out of the allowable range to do allow a reliable calibration. The reason for this  
must be determined before the analyzer can be calibrated. See Section 11 for troubleshooting tips.  
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Calibration Procedures  
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7.3. Manual Calibration Checks  
Informal calibration checks, which only evaluate but do not alter the analyzer’s response curve, are  
recommended as a regular maintenance item and in order to monitor the analyzer’s performance. To  
carry out a calibration check rather than a full calibration, follow these steps.  
STEP ONE: Connect the sources of zero air and span gas as shown in Figures 7.1 or 7.2.  
STEP TWO: Perform the zero/span calibration check procedure:  
ACTION:  
Supply the instrument with zero gas.  
SAMPLE  
RANGE = 500.0 PPM  
CO2=X.XXX  
SETUP  
Scroll the display to the  
STABIL test function.  
< TST TST > CAL  
SAMPLE  
STABIL=XXX.X PPM  
CO2=X.XXX  
SETUP  
< TST TST > CAL  
Wait until  
STABIL is  
below 1.0 ppm.  
This may take  
several minutes.  
ACTION:  
Record the CO2  
concentration  
reading.  
SAMPLE  
STABIL=XXX.X PPM  
CO2=X.XXX  
< TST TST > CAL  
SETUP  
The value of  
STABIL may jump  
significantly.  
ACTION:  
Supply span gas to the instrument  
Wait until it falls  
below 1.0 ppm. This  
may take several  
minutes.  
ACTION:  
Record the CO2  
concentration  
reading.  
SAMPLE  
STABIL=XXX.X PPM  
CO2=X.XXX  
SETUP  
< TST TST > CAL  
The SPAN key appears during the transition from zero to  
span. You may see both SPAN and ZERO buttons.  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
7.4. Manual Calibration with Zero/Span Valves  
There are four different zero/span valve option configurations (See Section 5.4). They all operate  
identically, differing only in the method used to supply calibration gas to the Analyzer.  
STEP ONE: Connect the sources of Zero Air and Span Gas as shown below.  
Figures 7-3 through 7-6 show the proper pneumatic connections for GFC 7000TAs with various optional  
internal valve sets installed.  
Figure 7-3:  
Pneumatic Connections – Ambient Zero/Pressurized Span Valves  
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Calibration Procedures  
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VENT here if input  
is pressurized  
Source of  
SAMPLE GAS  
Removed during  
calibration  
SAMPLE  
Calibrated  
CO2 Gas  
EXHAUST  
VENT SPAN  
PRESSURE SPAN  
IZS  
at span gas  
concentration  
VENT  
Chassis  
External  
Zero Air  
Scrubber  
N2  
PURGE LINE  
Figure 7-4:  
Pneumatic Connections – Ambient Zero/Pressurized Span Valves and External  
Zero Air Scrubber  
Figure 7-5:  
Pneumatic Connections – Ambient Zero/Ambient Span Valves  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
VENT here if input  
is pressurized  
Source of  
SAMPLE GAS  
Removed during  
calibration  
Calibrated  
Model T700 gas  
Dilution  
CO2 Gas  
at 100x span gas  
concentration  
Calibrator  
SAMPLE  
EXHAUST  
VENT SPAN  
PRESSURE SPAN  
IZS  
Chassis  
External  
Zero Air  
Scrubber  
PURGE LINE  
N2  
Figure 7-6:  
Pneumatic Connections – Ambient Zero/Ambient Span Valves with External Zero  
Air Scrubber  
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Calibration Procedures  
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STEP TWO: Set the expected CO2 Span Gas concentration:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
SETUP  
< TST TST > CAL CALZ CALS  
This sequence causes the  
analyzer to prompt for the  
expected CO2 span  
concentration.  
M-P CAL  
RANGE = 500.000 PPM  
CONC  
CO2 =X.XXX  
EXIT  
< TST TST > ZERO  
The CO2 span  
concentration values  
automatically default to  
400.0 Conc.  
EXIT ignores the new setting  
and returns to the previous  
display.  
ENTR accepts the new setting  
and returns to the  
M-P CAL  
CO2 SPAN CONC: 450.000 Conc  
.0 ENTR EXIT  
To change this value to  
the actual concentration of  
the span gas, enterthe  
number by pressing the  
button under each digit  
until the expected value  
appears.  
0
0
0
4
5
previous display.  
NOTE  
For this Initial Calibration it is important to independently verify the PRECISE CO2  
Concentration Value of the SPAN gas.  
If the source of the Span Gas is from a Calibrated Bottle, use the exact  
concentration value printed on the bottle.  
STEP THREE: Perform the zero/span calibration. Zero and span checks using the zero/span valve  
option are similar to that described in Section 7.2, except that zero air and span gas is supplied to the  
analyzer through the zero/span valves rather than through the sample inlet port.  
The zero and cal operations are initiated directly and independently with dedicated buttons (CALZ &  
CALS).  
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Calibration Procedures  
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SAMPLE*  
RANGE = 500.000 PPM  
CO2 =XXX.X  
Set the Display to show the  
STABIL test function.  
This function calculates the  
stability of the COx  
<TST TST> CAL CALZ CALS SETUP  
measurement  
SAMPLE  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > CAL CALZ CALS SETUP  
ACTION:  
Allow zero gas to enter the sample port at the  
rear of the instrument.  
Wait until STABIL  
falls below1.0 ppm.  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
SETUP  
< TST TST > CAL CALZ CALS  
M-P CAL  
STABIL=XXX.X PPM  
CONC  
CO2 =XXX.X  
EXIT  
< TST TST > ZERO  
Press ENTR to changes the  
OFFSET & SLOPE values for the  
CO2 measurements.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > ENTR  
CONC  
EXIT  
Press EXIT to leave the calibration  
unchanged and return to the  
previous menu.  
ACTION:  
Allow span gas to enter the sample port at the  
rear of the instrument.  
The value of  
STABIL may jump  
significantly.  
Wait until it falls back  
below 1.0 ppm.  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
EXIT  
The SPAN button now  
appears during the  
transition from zero to  
span.  
< TST TST >  
M-P CAL  
SPAN CONC  
If either the ZERO or  
SPAN buttons fail to  
appear see Section 11  
for troubleshooting tips.  
Press ENTR to change the  
OFFSET & SLOPE values for the  
CO2 measurements.  
RANGE = 500.000 PPM CO2 =XXX.X  
EXIT  
Press EXIT to leave the calibration  
unchanged and return to the  
previous menu.  
< TST TST > ENTR SPAN CONC  
M-P CAL  
RANGE = 500.000 PPM CO2 =XXX.X  
CONC EXIT  
EXIT returns to the main  
SAMPLE display  
< TST TST > ENTR  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
7.5. Manual Calibration Checks with Zero/Span Valves  
Zero and span checks using the VARIOUS zero/span valve options available for the GFC 7000TA are  
similar to that described in Section 7.3, except that the zero and calibration operations are initiated  
directly and independently with dedicated buttons CALZ and CALS.  
To perform a manual calibration check of an analyzer with a valve option installed, use the following  
method.  
STEP ONE: Connect the sources of Zero Air and Span Gas as shown in Figures 7-3 through 7-6.  
STEP TWO: Perform the zero/span check.  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
Scroll to the STABIL test  
< TST TST > CAL CALZ CALS  
SETUP  
function.  
SAMPLE  
STABIL=XXX.X PPM  
CO2 =X.XXX  
SETUP  
Wait until STABIL  
falls below 1.0  
ppm.  
< TST TST > CAL CALZ CALS  
ACTION:  
Record the  
CO2 readings  
presented in the  
upper right corner of  
the display.  
This may take  
several minutes.  
ZERO CAL M  
STABIL=XXX.X PPM CO2 =X.XXX  
< TST TST > ZERO  
CONC  
EXIT  
SAMPLE  
STABIL=XXX.X PPM CO2 =X.XXX  
ACTION:  
Record the  
CO2 readings  
presented in the  
upper right corner of  
the display.  
The value of STABIL  
may jump  
significantly. Wait  
until STABIL falls  
below 1.0 ppm. This  
may take several  
minutes.  
< TST TST > CAL CALZ CALS  
SETUP  
SPAN CAL M  
STABIL=XXX.X PPM  
CO2 =X.XXX  
EXIT  
EXIT returns to the main  
< TST TST > ZERO SPAN CONC  
SAMPLE display  
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7.5.1. Zero/Span Calibration on Auto Range or Dual Ranges  
If the analyzer is being operated in dual range mode or auto range mode, then the high and low ranges  
must be independently calibrated.  
When the analyzer is in either dual or auto range modes the user must run a separate calibration  
procedure for each range. After pressing the CAL, CALZ or CALS buttons the user is prompted for the  
range that is to be calibrated as seen in the CALZ example below:  
SAMPLE*  
RANGE = 500.000 PPM  
CO2 =XXX.X  
SETUP  
Set the Display to show the  
STABIL test function.  
This function calculates the  
stability of the CO2  
<TST TST> CAL CALZ CALS  
measurement  
SAMPLE  
STABIL=XXX.X PPM  
CO2 =XXX.X  
SETUP  
< TST TST > CAL CALZ CALS  
ACTION:  
Allow zero gas to enter the sample port at the  
rear of the instrument.  
Wait until STABIL  
falls below 1.0 ppm.  
This may take several  
minutes.  
M-P CAL  
STABIL=XXX.X PPM  
CO2 =XXX.X  
< TST TST > CAL CALZ CALS  
SETUP  
SAMPLE  
RANGE TO CAL: LOW  
ENTR  
LOW HIGH  
SETUP  
SETUP  
SAMPLE  
RANGE TO CAL: HIGH  
ENTR  
LOW HIGH  
ANALYZER ENTERS  
ZERO CAL MODE  
ZERO CAL M  
RANGE = 500.000 PPM CO2 =XXX.X  
< TST TST > ZERO SPAN CONC  
EXIT  
Continue Calibration as per  
Standard Procedure  
Once this selection is made, the calibration procedure continues as previously described in Section 7.2.  
The other range may be calibrated by starting over from the main SAMPLE display.  
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Calibration Procedures  
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7.5.2. Use of Zero/Span Valves with Remote Contact Closure  
Contact closures for controlling calibration are located on the rear panel CONTROL IN connector.  
Instructions for setup and use of these contacts are found in Section 6.15.1.2. When the contacts are  
closed for at least 5 seconds, the instrument switches into zero or span mode. The remote calibration  
contact closures may be activated in any order. It is recommended that contact closures remain closed  
for at least 10 minutes to establish a reliable reading.  
The instrument will stay in the selected mode for as long as the contacts remain closed. If calibration is  
enabled, the GFC 7000TA will re-calibrate when the contact is opened, then go into SAMPLE mode. If  
calibration is disabled, the instrument will return to SAMPLE mode, leaving the calibration unchanged.  
7.6. Automatic Zero/Span Cal/Check (AutoCal)  
The AutoCal system allows unattended periodic operation of the ZERO/SPAN valve options by using the  
GFC 7000TA’s internal time of day clock. AutoCal operates by executing SEQUENCES programmed by  
the user to initiate the various calibration modes of the analyzer and open and close valves appropriately.  
It is possible to program and run up to 3 separate sequences (SEQ1, SEQ2 and SEQ3). Each sequence  
can operate in one of 3 Modes, or be disabled.  
Table 7-1: AUTOCAL Modes  
MODE NAME  
DISABLED  
ZERO  
ACTION  
Disables the Sequence  
Causes the Sequence to perform a zero calibration/check  
ZERO-SPAN  
Causes the Sequence to perform a zero and span concentration  
calibration/check  
SPAN  
Causes the Sequence to perform a span concentration  
calibration/check  
For each mode there are seven parameters that control operational details of the SEQUENCE. They are:  
Table 7-2: AutoCal ATTRIBUTE Setup Parameters  
ATTRIBUTE NAME  
TIMER ENABLED  
STARTING DATE  
STARTING TIME  
DELTA DAYS  
ACTION  
Turns on the Sequence timer  
Sequence will operate after Starting Date  
Time of day sequence will run  
Number of days to skip between each Seq. execution  
Number of hours later each “Delta Days” Seq is to be run  
Number of minutes the sequence operates  
DELTA TIME  
DURATION  
CALIBRATE  
Enable to do a calibration – Disable to do a cal check only  
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The following example sets Sequence #2 to do a Zero-Span Calibration every other day starting at 1 am  
on September 4, 2001, lasting 15 minutes, without calibration. This will start ½ hour later each iteration.  
MODE AND ATTRIBUTE  
Sequence  
VALUE  
COMMENT  
Define Sequence #2  
2
ZERO-SPAN  
ON  
Mode  
Select Zero and Span Mode  
Enable the timer  
Timer Enable  
Starting Date  
Starting Time  
Delta Days  
Sept. 4, 2001  
01:00  
Start after Sept 4, 2001  
First Span starts at 1:00AM  
Do Sequence #2 every other day  
Do Sequence #2 ½ hr later each day  
Operate Span valve for 15 min  
Do not calibrate at end of Sequence  
2
Delta Time  
00:30  
Duration  
15.0  
Calibrate  
NO  
NOTE  
The programmed STARTING_TIME must be a minimum of 5 minutes later than the  
real time clock (See Section 6.10 for setting real time clock).  
NOTE  
Avoid setting two or more sequences at the same time of the day. Any new  
sequence which is initiated whether from a timer, the COM ports, or the contact  
closure inputs will override any sequence which is in progress.  
NOTE  
If at any time an illegal entry is selected (Example: Delta Days > 367) the ENTR  
button will disappear from the display.  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
To program the Sequence:  
SAMPLE*  
RANGE = 500.000 PPM CO2 =X.XXX  
SETUP X.X STARTING TIME:14:15  
< TST TST > CAL CALZ CALS  
SETUP  
<SET SET> EDIT  
EXIT  
EXIT  
SETUP X.X  
PRIMARY SETUP MENU  
SETUP X.X  
DELTA DAYS: 1  
CFG ACAL DAS RNGE PASS CLK MORE  
EXIT  
EXIT  
<SET SET> EDIT  
Toggle  
buttons to  
set  
SETUP X.X SEQ 1) DISABLED  
SETUP X.X DELTA DAYS: 1  
number of  
NEXT MODE  
days  
0
0
2
ENTR EXIT  
between  
procedures  
(1-367)  
SETUP X.X SEQ 2) DISABLED  
SETUP X.X DELTA DAYS:2  
PREV NEXT MODE  
EXIT  
<SET SET> EDIT  
EXIT  
SETUP X.X MODE: DISABLED  
SETUP X.X DELTA TIME00:00  
NEXT  
ENTR EXIT  
ENTR EXIT  
ENTR EXIT  
EXIT  
<SET SET> EDIT  
EXIT  
ENTR EXIT  
EXIT  
SETUP X.X MODE: ZERO  
Toggle  
buttons to set  
delay time for  
each iteration  
of the  
sequence:  
HH:MM  
PREV NEXT  
SETUP X.X DELTA TIME: 00:00  
0
0
:3  
0
SETUP X.X MODE: ZERO–SPAN  
(0 – 24:00)  
PREV NEXT  
SETUP X.X DELTA TIEM:00:30  
<SET SET> EDIT  
SETUP X.X SEQ 2) ZERO–SPAN, 1:00:00  
PREV NEXT MODE SET  
SETUP X.X DURATION:15.0 MINUTES  
Toggle  
buttons to  
set  
duration for  
each  
iteration of  
the  
sequence:  
<SET SET> EDIT  
EXIT  
ENTR EXIT  
EXIT  
Default  
value is  
ON  
SETUP X.X TIMER ENABLE: ON  
SET> EDIT  
EXIT  
SETUP X.X DURATION 15.0MINUTES  
3
0
.0  
SETUP X.X STARTING DATE: 01–JAN–02  
Set in  
Decimal  
minutes  
from  
<SET SET> EDIT  
EXIT  
SETUP X.X DURATION:30.0 MINUTES  
0.1 – 60.0  
Toggle  
buttons to set  
day, month &  
year:  
<SET SET> EDIT  
SETUP X.X STARTING DATE: 01–JAN–02  
0
4
SEP  
0
3
ENTR EXIT  
Format :  
DD-MON-YY  
SETUP X.X  
CALIBRATE: OFF  
SETUP X.X STARTING DATE: 04–SEP–03  
<SET SET> EDIT  
EXIT  
ENTR EXIT  
EXIT  
<SET SET> EDIT  
EXIT  
Toggle  
button  
between  
Off and  
ON  
SETUP X.X  
ON  
CALIBRATE: OFF  
SETUP X.X STARTING DATE: 04–SEP–03  
<SET SET> EDIT  
EXIT  
SETUP X.X  
CALIBRATE: ON  
Toggle buttons  
to set time:  
SETUP X.X STARTING TIME:00:00  
<SET SET> EDIT  
Format : HH:MM  
<SET SET> EDIT  
EXIT  
This is a 24 hr  
clock .  
PM hours are  
13 – 24.  
SETUP X.X SEQ 2) ZERO–SPAN, 2:00:30  
EXIT returns  
to the SETUP  
Menu  
SETUP X.X STARTING TIME:00:00  
Example  
2:15 PM = 14:15  
PREV NEXT MODE SET  
EXIT  
1
4
: 1  
5
ENTR EXIT/  
Sequence  
Delta Time  
Delta Days  
MODE  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
7.6.1. AutoCal with Auto or Dual Reporting Ranges Modes Selected  
SETUP C.4  
<SET  
RANGE TO CAL: LOW  
EDIT  
EXIT  
SETUP C.4  
RANGE TO CAL: LOW  
RANGE TO CAL: HIGH  
LOW HIGH  
ENTR SETUP  
SETUP C.4  
<SET  
EDIT  
EXIT  
EXIT  
SETUP C.4 SEQ 2) ZERO–SPAN, 2:00:30  
EXIT returns to the  
PRIMARY SETUP  
Menu  
PREV NEXT MODE SET  
NOTE  
In order to automatically calibrate both the HIGH and LOW ranges, you must set  
up a separate sequence for each.  
7.7. Calibration Quality  
After completing one of the calibration procedures described above, it is important to evaluate the  
analyzer’s calibration SLOPE and OFFSET parameters. These values describe the linear response curve  
of the analyzer. The values for these terms, both individually and relative to each other, indicate the  
quality of the calibration. To perform this quality evaluation, you will need to record the values of both test  
functions (Section 6.2.1 or Appendix A-3), all of which are automatically stored in the DAS channel  
CALDAT for data analysis, documentation and archival.  
Make sure that these parameters are within the limits listed in Table 7-3 and frequently compare them to  
those values on the Final Test and Checkout Sheet that came attached to your manual, which should not  
be significantly different. If they are, refer to the troubleshooting Section 11.  
Table 7-3: Calibration Data Quality Evaluation  
FUNCTION  
SLOPE  
MINIMUM VALUE  
0.700  
OPTIMUM VALUE  
1.000  
MAXIMUM VALUE  
1.300  
OFFS  
-0.500  
0.000  
0.500  
These values should not be significantly different from the values recorded on the Teledyne Instruments  
Final Test and Validation Data sheet that was shipped with your instrument. If they are, refer to the  
troubleshooting Section 11.  
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Calibration Procedures  
Model GFC7000TA Carbon Dioxide Analyzer  
The default DAS configuration records all calibration values in channel CALDAT as well as all calibration  
check (zero and span) values in its internal memory. Up to 200 data points are stored for up 4 years of  
data (on weekly calibration checks) and a lifetime history of monthly calibrations. Review these data to  
see if the zero and span responses change over time. These channels also store the STABIL value  
(standard deviation of CO concentration) to evaluate if the analyzer response has properly leveled off  
during the calibration procedure. Finally, the CALDAT channel also stores the converter efficiency for  
review and documentation.  
If your instrument has an O2 sensor option installed that should be calibrated as well.  
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8. MAINTENANCE SCHEDULE & PROCEDURES  
Predictive diagnostic functions, including data acquisition records, failure warnings and test functions built  
into the analyzer, allow the user to determine when repairs are necessary without performing painstaking  
preventative maintenance procedures. There are, however, a minimal number of simple procedures that  
when performed regularly will ensure that the analyzer continues to operate accurately and reliably over  
its lifetime. Repairs and troubleshooting are covered in Section 11 of this manual.  
8.1. Maintenance Schedule  
Table 9-1 shows a typical maintenance schedule for the analyzer. Please note that in certain  
environments (i.e. dusty, very high ambient pollutant levels) some maintenance procedures may need to  
be performed more often than shown.  
NOTE  
A Span and Zero Calibration Check (see CAL CHECK REQ’D Column of Table 9-1)  
must be performed following certain of the maintenance procedure listed below.  
See Sections 7.3, 7.5 and 7.6 for instructions on performing checks.  
CAUTION  
Risk of electrical shock. Disconnect power before performing any of the following  
operations that require entry into the interior of the analyzer.  
NOTE  
The operations outlined in this section are to be performed by qualified maintenance  
personnel only.  
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Maintenance  
Model GFC7000TA Carbon Dioxide Analyzer  
Table 8-1: GFC 7000TA Maintenance Schedule  
CAL  
DATE PERFORMED  
ITEM  
ACTION  
FREQ  
CHECK  
REQ’D.  
MANUAL  
Particulate  
Filter  
Weekly or as  
needed  
Replace  
Yes  
No  
Weekly or after  
any  
Maintenance  
or Repair  
Verify Test  
Functions  
Record and  
analyze  
Pump  
Diaphragm  
Replace  
Annually  
Annually  
Yes  
No  
Perform  
Flow Check  
Check Flow  
Annually or  
after any  
Maintenance  
or Repair  
Perform  
Leak Check  
Verify Leak  
Tight  
No  
Pneumatic  
lines  
Examine  
and clean  
Yes if  
cleaned  
As needed  
As needed  
Only if  
cover  
Cleaning  
Clean  
remv’d  
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Maintenance  
Model GFC7000TA Carbon Dioxide Analyzer  
Table 8-2: GFC 7000TA Test Function Record  
DATE RECORDED  
OPERATING  
FUNCTION  
MODE*  
ZERO CAL  
STABILITY  
ZERO CAL  
CO2 MEAS  
Zero CAL  
MR RATIO  
SPAN CAL  
SAMPLE  
PRES  
SAMPLE After  
Warm-up  
PHT DRIVE  
SPAN CAL  
SLOPE  
ZERO CAL  
OFFSET  
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Maintenance  
Model GFC7000TA Carbon Dioxide Analyzer  
8.2. Predicting Failures Using the Test Functions  
The Test Functions can be used to predict failures by looking at how their values change over time.  
Initially it may be useful to compare the state of these Test Functions to the values recorded on the  
printed record of the final calibration performed on your instrument at the factory, p/n 04307. Table 9-3  
can be used as a basis for taking action as these values change with time. The internal data acquisition  
system (DAS) is a convenient way to record and track these changes. Use APICOM to download and  
review this data from a remote location.  
Table 8-3: Predictive uses for Test Functions  
FUNCTION  
STABILITY  
CONDITION  
BEHAVIOR  
INTERPRETATION  
Pneumatic Leaks – instrument & sample system  
Detector deteriorating  
Zero Cal  
Increasing  
Source Aging  
CO2 MEAS  
Detector deteriorating  
Zero Cal  
Zero Cal  
Decreasing  
Increasing  
Optics getting dirty or contaminated  
Source Aging  
Detector deteriorating  
Contaminated zero gas (H2O)  
Source Aging  
Detector deteriorating  
GFC Wheel Leaking  
Decreasing  
Increasing  
Pneumatic Leaks  
MR RATIO  
Contaminated zero gas (CO2)  
Source Aging  
Pneumatic Leaks – instrument & sample system  
Calibration system deteriorating  
Source Aging  
Span Cal  
Sample  
GFC Wheel Leaking  
Decreasing  
Calibration system deteriorating  
Pneumatic Leak between sample inlet and Sample Cell  
Change in sampling manifold  
Dirty particulate filter  
Increasing > 1”  
PRES  
Pneumatic obstruction between sample inlet and Sample  
Cell  
Decreasing > 1”  
Obstruction in sampling manifold  
Mechanical Connection between IR-Detector and Sample  
Cell deteriorating  
Any, but with  
Bench Temp at  
48°C  
PHT DRIVE  
Increasing  
IR-Photodetector deteriorating  
See MR Ratio - Zero Cal Decreasing above  
See MR Ratio - Zero Cal Increasing above  
See MR Ratio - Span Cal Decreasing above  
See MR Ratio – Span Cal Increasing above  
Increasing  
Decreasing  
Increasing  
Decreasing  
OFFSET  
SLOPE  
Zero Cal  
Span Cal  
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Maintenance  
Model GFC7000TA Carbon Dioxide Analyzer  
8.3. Maintenance Procedures  
The following procedures are to be performed periodically as part of the standard maintenance of the  
Model GFC 7000TA.  
8.3.1. Replacing the Sample Particulate Filter  
The particulate filter should be inspected often for signs of plugging or contamination. We recommend  
that when you change the filter, handle it and the wetted surfaces of the filter housing as little as possible.  
Do not touch any part of the housing, filter element, PTFE retaining ring, glass cover and the o-ring.  
To change the filter:  
1. Turn OFF the analyzer to prevent drawing debris into the instrument.  
2. Open the GFC 7000TA’s hinged front panel and unscrew the knurled retaining ring on the filter  
assembly.  
Figure 8-1:  
Sample Particulate Filter Assembly  
3. Carefully remove the retaining ring, PTFE o-ring, glass filter cover and filter element.  
4. Replace the filter, being careful that the element is fully seated and centered in the bottom of the  
holder.  
5. Re-install the PTFE o-ring with the notches up, install the glass cover, then screw on the retaining  
ring and hand tighten. Inspect the seal between the edge of filter and the o-ring to assure a  
proper seal.  
6. Re-start the Analyzer.  
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Maintenance  
Model GFC7000TA Carbon Dioxide Analyzer  
8.3.2. Rebuilding the Sample Pump  
The diaphragm in the sample pump periodically wears out and must be replaced. A sample rebuild kit is  
available – see Appendix B of this manual for the part number of the pump rebuild kit. Instructions and  
diagrams are included with the kit.  
Always perform a Flow and Leak Check after rebuilding the Sample Pump.  
8.3.3. Performing Leak Checks  
Leaks are the most common cause of analyzer malfunction; Section 8.3.3.1 presents a simple leak check  
procedure. Section 8.3.3.2 details a more thorough procedure.  
8.3.3.1. Vacuum Leak Check and Pump Check  
This method is easy and fast. It detects, but does not locate most leaks; it also verifies that the sample  
pump is in good condition.  
1. Turn the analyzer ON, and allow enough time for flows to stabilize.  
2. Cap the sample inlet port.  
3. After several minutes, when the pressures have stabilized, note the following. In the TEST menu,  
note the SAMPLE PRESSURE reading.  
4. If the reading is < 10 in-Hg, the pump is in good condition and there are no large leaks.  
5. Check the sample gas flow. If the flow is <10 cm3/min and stable, there are no large leaks in the  
instrument’s pneumatics.  
8.3.3.2. Pressure Leak Check  
If you can’t locate the leak by the above procedure, use the following procedure. Obtain a leak checker  
similar to the Teledyne Instruments part number 01960, which contains a small pump, shut-off valve, and  
pressure gauge. Alternatively, a convenient source of low-pressure gas is a tank of span gas, with the  
two-stage regulator adjusted to less than 15 psi with a shutoff valve and pressure gauge.  
CAUTION  
Do not use bubble solution with vacuum applied to the analyzer. The solution may  
contaminate the instrument. Do not exceed 15 PSIG pressure.  
1. Turn OFF power to the instrument.  
2. Install a leak checker or tank of gas as described above on the sample inlet at the rear panel.  
3. Remove the instrument cover and locate the inlet side of the sample pump. Remove the flow  
assembly from the pump and plug it with the appropriate gas-tight fitting.  
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Maintenance  
Model GFC7000TA Carbon Dioxide Analyzer  
4. Pressurize the instrument with the leak checker, allowing enough time to fully pressurize the  
instrument through the critical flow orifice. Check each fitting with soap bubble solution, looking  
for bubbles. Once the fittings have been wetted with soap solution, do not re-apply vacuum, as it  
will suck soap solution into the instrument and contaminate it. Do not exceed 15 psi pressure.  
5. If the instrument has one of the zero and span valve options, the normally closed ports on each  
valve should also be separately checked. Connect the leak checker to the normally closed ports  
and check with soap bubble solution.  
6. Once the leak has been located and repaired, the leak-down rate should be < 1 in-Hg (0.4 psi) in  
5 minutes after the pressure is shut off.  
8.3.4. Performing a Sample Flow Check  
CAUTION  
Always use a separate calibrated flow meter capable of measuring flows in the 0 – 1000  
cc/min range to measure the gas flow rate though the analyzer.  
DO NOT use the built in flow measurement viewable from the Front Panel of the  
instrument. This measurement is only for detecting major flow interruptions such as  
clogged or plugged gas lines.  
See Figure 3-4 for SAMPLE port location.  
1. Attach the Flow Meter to the sample inlet port on the rear panel. Ensure that the inlet to the Flow  
Meter is at atmospheric f.  
2. Sample flow should be 800 cc/min 10%.  
3. Once an accurate measurement has been recorded by the method described above, adjust the  
analyzer’s internal flow sensors (See Section 6.13.8)  
Low flows indicate blockage somewhere in the pneumatic pathway, typically a plugged sintered filter or  
critical flow orifice in one of the analyzer’s flow control assemblies. High flows indicate leaks downstream  
of the Flow Control Assembly.  
8.3.5. Cleaning the Optical Bench  
The GFC 7000TA sensor assembly and optical bench is complex and delicate. Disassembly and  
cleaning is not recommended. Please check with the factory before disassembling the optical bench.  
8.3.6. Cleaning Exterior Surfaces of the GFC 7000TA  
If necessary, the exterior surfaces of the GFC 7000TA can be cleaned with a clean damp cloth. Do not  
submerge any part of the instrument in water or cleaning solution.  
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Theory of Operation  
Model GFC7000TA Carbon Dioxide Analyzer  
9. THEORY OF OPERATION  
The Model GFC 7000TA Gas Filter Correlation Carbon Dioxide Analyzer is a microprocessor-controlled  
analyzer that determines the concentration of carbon dioxide (CO2) in a sample gas drawn through the  
instrument. It requires that sample and calibration gasses be supplied at ambient atmospheric pressure  
in order to establish a stable gas flow through the sample chamber where the gases ability to absorb  
infrared radiation is measured.  
Calibration of the instrument is performed in software and does not require physical adjustments to the  
instrument. During calibration the microprocessor measures the current state of the IR Sensor output and  
various other physical parameters of the instrument and stores them in memory.  
The microprocessor uses these calibration values, the IR absorption measurements made on the sample  
gas along with data regarding the current temperature and pressure of the gas to calculate a final co2  
concentration.  
This concentration value and the original information from which it was calculated are stored in one of the  
unit’s internal data acquisition system (DAS - See Sections 6.7) as well as reported to the user via a  
vacuum florescent display or a variety of digital and analog signal outputs.  
9.1. Measurement Method  
9.1.1. Beer’s Law  
The basic principle by which the analyzer works is called Beer’s Law. It defines the how light of a specific  
wavelength is absorbed by a particular gas molecule over a certain distance. The mathematical  
relationship between these three parameters is:  
I = Io e-αLc  
Where:  
Io  
is the intensity of the light if there was no absorption.  
is the intensity with absorption.  
is the absorption path, or the distance the light travels as it is being absorbed.  
I
L
C
is the concentration of the absorbing gas. In the case of the Model GFC 7000TA, carbon  
dioxide (CO2).  
α
is the absorption coefficient that tells how well CO2 absorbs light at the specific wavelength  
of interest.  
9.1.2. Measurement Fundamentals  
In the most basic terms, the Model GFC 7000TA uses a high energy heated element to generate a beam  
of broad-band IR light with a known intensity (measured during Instrument calibration. This beam is  
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Theory of Operation  
Model GFC7000TA Carbon Dioxide Analyzer  
directed through multi-pass cell filled with sample gas. The sample cell uses mirrors at each end to  
reflect the IR beam back and forth through the sample gas to generate a 2.5 meter absorption path (see  
Figure 10–1). This length was chosen to give the analyzer maximum sensitivity to fluctuations in CO2  
density.  
Band-Pass Filter  
Sample Chamber  
IR  
Source  
Photo-Detector  
IR Beam  
Figure 9-1:  
Measurement Fundamentals  
Upon exiting the sample cell, the beam shines through a band-pass filter that allows only light at a  
wavelength of 4.3 µm to pass. Finally, the beam strikes a solid-state photo-detector that converts the  
light signal into a modulated voltage signal representing the attenuated intensity of the beam.  
9.1.3. Gas Filter Correlation  
Unfortunately, water vapor absorbs light at 4.3 µm too. To overcome the interfering effects of water vapor  
the Model GFC 7000TA adds another component to the IR light path called a gas filter correlation (GFC)  
wheel (see Figure 10-2).  
Measurement Cell  
(Pure N2)  
Reference Cell  
(N2 with CO2)  
Figure 9-2:  
GFC Wheel  
9.1.3.1. The GFC Wheel  
A GFC wheel is a metallic wheel into which two chambers are carved. The chambers are sealed on both  
sides with material transparent to 4.3 µm IR radiation creating two airtight cavities. Each cavity is filled  
with specially composed gases. One cell is filled with pure N2 (the measure cell). The other is filled with a  
combination of N2 and a high concentration of CO2 (the reference cell).  
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Theory of Operation  
Model GFC7000TA Carbon Dioxide Analyzer  
IR unaffected by N2 in Measurement Cell  
Δ H  
IR IS affected by CO2 in Reference Cell  
M
IR  
Source  
Photo-Detector  
R
GFC Wheel  
Figure 9-3:  
Measurement Fundamentals with GFC Wheel  
As the GFC wheel spins, the IR light alternately passes through the two cavities. When the beam is  
exposed to the reference cell, the CO2 in the gas filter wheel strips the beam of most of the IR at 4.3μm.  
When the light beam is exposed to the measurement cell, the N2 in the filter wheel does not absorb IR  
light. This results in a fluctuation in the intensity of the IR light striking the photo-detector (See Figure 10-  
3) that results in the output of the detector resembling a square wave.  
9.1.3.2. The Measure Reference Ratio  
The Model GFC 7000TA determines the amount of CO2 in the sample chamber by computing the ratio  
between the peak of the measurement pulse (CO2 MEAS) and the peak of the reference pulse (CO2  
REF).  
If no gases exist in the sample chamber that absorb light at 4.3μm, the high concentration of CO2 in the  
gas mixture of the reference cell will attenuate the intensity of the IR beam by 60% giving a M/R ratio of  
approximately 2.4:1.  
Adding CO2 to the sample chamber causes the peaks corresponding to both cells to be attenuated by a  
further percentage. Since the intensity of the light passing through the measurement cell is greater, the  
effect of this additional attenuation is greater. This causes CO2 MEAS to be more sensitive to the  
presence of CO2 in the sample chamber than CO2 REF and the ratio between them (M/R) to move closer  
to 1:1 as the concentration of CO2 in the sample chamber increases.  
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Theory of Operation  
Model GFC7000TA Carbon Dioxide Analyzer  
IR unaffected by N2 in Measurement Cell of  
the GFC Wheel and no additional CO2 in  
the Sample Chamber  
CO2 MEAS  
CO2 REF  
IR affected by CO2 in Reference Cell  
with no interfering gas in the Sample  
Chamber  
IR shinning through Measurement Cell of  
the GFC Wheel is reduced by additional  
CO2 in the Sample Chamber  
M/R  
is reduced  
IR shining through Reference Cell is  
also reduced by additional CO2 in the  
Sample Chamber, but to a lesser extent  
Figure 9-4:  
Affect of CO2 in the Sample on CO2 MEAS & CO2 REF  
Once the Model GFC 7000TA has computed this ratio, a look-up table is used, with interpolation, to  
linearize the response of the instrument. This linearized concentration value is combined with calibration  
SLOPE and OFFSET values to produce the CO2 concentration which is then normalized for changes in  
sample pressure.  
9.1.4. Interference and Signal to Noise Rejection  
If an interfering gas, such as H2O vapor is introduced into the sample chamber, the spectrum of the IR  
beam is changed in a way that is identical for both the reference and the measurement cells, but without  
changing the ratio between the peak heights of CO2 MEAS and CO2 REF. In effect, the difference  
between the peak heights remains the same.  
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Theory of Operation  
Model GFC7000TA Carbon Dioxide Analyzer  
M/R  
is Shifted  
IR shining through both cells is effected  
equally by interfering gas in the Sample  
Chamber  
Figure 9-5:  
Effects of Interfering Gas on CO2 MEAS & CO2 REF  
Thus, the difference in the peak heights and the resulting M/R ratio is only due to CO2 and not to  
interfering gases. In this way, Gas filter correlation rejects the effects of interfering gases and so that the  
analyzer responds only to the presence of CO2.  
To improve the signal-to-noise performance of the IR photo-detector, the GFC wheel also incorporates an  
optical mask that chops the IR beam into alternating pulses of light and dark at six times the frequency of  
the measure/reference signal. This limits the detection bandwidth helping to reject interfering signals  
from outside this bandwidth improving the signal to noise ratio.  
The IR Signal as the Photo-Detector sees it  
after being chopped by the GFC Wheel  
Screen  
CO2 MEAS  
CO2 REF  
Figure 9-6:  
Chopped IR Signal  
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9.1.4.1. Ambient CO2 Interference Rejection  
CO2 absorbs IR light very well. So well that even the narrow volume of ambient air between the IR  
source and the sample chamber is enough to alter the analyzer’s measured concentration of CO2. Also,  
ambient air, which averages around 350 ppm to 400 ppm, will vary significantly over the course of the  
day. The ambient CO2 concentration can rise as high as 1 000 ppm during the time of the day when  
people are present. It can fluctuate 300 ppm as the photosynthesis of plant life in the nearby area  
increases during the day and decreases at night.  
The basic design of the GFC 7000TA rejects most of this interference at a 100:1 ratio; however this still  
can allow small fluctuations in CO2 concentration during the course of the day. To completely remove all  
effects of ambient CO2 from the analyzer’s measurement of CO2, dried air, scrubbed of all CO2 is pumped  
into the GFC wheel housing to purge all ambient CO2 (see Figure 10-7)  
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9.2. Pneumatic Operation  
CAUTION  
It is important that the sample airflow system is both leak tight and not pressurized  
over ambient pressure.  
Regular leak checks should be performed on the analyzer as described in the  
maintenance schedule, Table 9-1.  
Procedures for correctly performing leak checks can be found in Section 9.3.3.  
An internal pump evacuates the sample chamber creating a small vacuum that draws sample gas into the  
analyzer. Normally the analyzer is operated with its inlet near ambient pressure either because the  
sample is directly drawn at the inlet or a small vent is installed at the inlet. There are several advantages  
to this “pull through” configuration.  
By placing the pump down stream from the sample chamber several problems are avoided.  
First the pumping process heats and compresses the sample air complicating the measurement  
process.  
Additionally, certain physical parts of the pump itself are made of materials that might chemically  
react with the sample gas.  
Finally, in certain applications where the concentration of the target gas might be high enough to be  
hazardous, maintaining a negative gas pressure relative to ambient means that should a minor leak  
occur, no sample gas will be pumped into the atmosphere surrounding analyzer.  
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9.2.1. Sample Gas Flow  
Sample Gas  
Flow Control  
SAMPLE  
PRESSURE  
SENSOR  
CO2  
FLOW  
SENSOR  
Purge Gas  
Pressure Control  
Figure 9-7:  
Internal Pneumatic Flow – Basic Configuration  
9.2.2. Flow Rate Control  
To maintain a constant flow rate of the sample gas through the instrument, the Model GFC 7000TA uses  
special flow control assemblies located in the purge gas line at the entrance to the GFC wheel housing  
and in the exhaust gas line just before the pump (see Figure 10-7). These assemblies consists of:  
A critical flow orifice.  
Two o-rings: Located just before and after the critical flow orifice, the o-rings seal the gap between  
the walls of assembly housing and the critical flow orifice.  
A spring: Applies mechanical force needed to form the seal between the o-rings, the critical flow  
orifice and the assembly housing.  
9.2.2.1. Critical Flow Orifice  
The most important component of this flow control assembly is the critical flow orifice.  
Critical flow orifices are a remarkably simple way to regulate stable gas flow rates. They operate without  
moving parts by taking advantage of the laws of fluid dynamics. By restricting the flow of gas though the  
orifice, a pressure differential is created. This pressure differential combined with the action of the  
analyzer’s pump draws the gas through the orifice.  
As the pressure on the downstream side of the orifice (the pump side) continues to drop, the speed that  
the gas flows though the orifice continues to rise. Once the ratio of upstream pressure to downstream  
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pressure is greater than 2:1, the velocity of the gas through the orifice reaches the speed of sound. As  
long as that ratio stays at least 2:1 the gas flow rate is unaffected by any fluctuations, surges, or changes  
in downstream pressure because such variations only travel at the speed of sound themselves and are  
therefore cancelled out by the sonic shockwave at the downstream exit of the critical flow orifice.  
CRITICAL  
FLOW  
ORIFICE  
AREA OF  
LOW  
AREA OF  
HIGH  
PRESSURE  
PRESSURE  
Sonic  
Shockwave  
O-RINGS  
SPRING  
FILTER  
Figure 9-8:  
Flow Control Assembly & Critical Flow Orifice  
The actual flow rate of gas through the orifice (volume of gas per unit of time), depends on the size and  
shape of the aperture in the orifice. The larger the hole, the more gas molecules, moving at the speed of  
sound, pass through the orifice. Because the flow rate of gas through the orifice is only related to the  
minimum 2:1 pressure differential and not absolute pressure the flow rate of the gas is also unaffected by  
degradations in pump efficiency due to age.  
The critical flow orifice used in the Model GFC 7000TA is designed to provide a flow rate of 800 cm3/min.  
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9.2.3. Purge Gas Pressure Control  
In order to ensure that all of the ambient CO2 is purged from the GFC Wheel housing an adequate supply  
of dried air, scrubbed of CO2 must be supplied to the PURGE AIR inlet at the back of the instrument.  
The minimum gas pressure of the source of purge air should be 7.5 psig.  
If the source of the purge air is shared by a Teledyne TAI’s T700 (as shown in figure 3-7) the  
minimum gas pressure should be 25 psig and should not exceed 35 psig.  
In order to maintain the proper pressure differential between the inside of the GFC wheel housing and  
ambient air, the GFC 7000TA design includes a manually adjustable pressure regulator (see Figure 3-5  
and Figure 3-6 for Purge Gas Pressure Regulator) that maintains the pressure of the purge air feed at 7.5  
psig.  
9.2.4. Particulate Filter  
The Model GFC 7000TA Analyzer comes equipped with a 47 mm diameter, Teflon, particulate filter with a  
5 micron pore size. The filter is accessible through the front panel, which folds down to allow access, and  
should be changed according to the suggested maintenance schedule described in Table 9-1.  
9.2.5. Pneumatic Sensors  
9.2.5.1. Sample Pressure Sensor  
An absolute value pressure transducer plumbed to the outlet of the sample chamber is used to measure  
sample pressure. The output of the sensor is used to compensate the concentration measurement for  
changes in air pressure. This sensor is mounted to a printed circuit board with the sample flow sensor on  
the sample chamber; see the following section and Figure 3-3.  
9.2.5.2. Sample Flow Sensor  
A thermal-mass flow sensor is used to measure the sample flow through the analyzer. The sensor is  
calibrated at the factory with ambient air or N2, but can be calibrated to operate with samples consisting of  
other gases such as CO2, See Section 9.3.4. This sensor is mounted to a printed circuit board with the  
Sample Pressure sensor on the sample chamber; see the previous section and Figure 3-3.  
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9.3. Electronic Operation  
9.3.1. Overview  
Figure 10-9 shows a block diagram of the major electronic components of the Model GFC 7000TA.  
The core of the analyzer is a microcomputer/central processing unit (CPU) that controls various internal  
processes, interprets data, makes calculations, and reports results using specialized firmware developed  
by Teledyne Instruments. It communicates with the user as well as receives data from and issues  
commands to a variety of peripheral devices via a separate printed circuit assembly called the Mother  
Board.  
The mother board, directly mounted to the analyzer’s inside rear panel, collects data, performs signal  
conditioning duties and routs incoming and outgoing signals between the CPU and the analyzer’s other  
major components.  
Data is generated by a gas-filter-correlation optical bench which outputs an analog signal corresponding  
to the concentration of CO2 in the sample gas. This analog signal is transformed into two, pre-amplified,  
DC voltages (CO2 MEAS and CO2 REF) by a synchronous demodulator printed circuit assembly. CO2  
MEAS and CO2 REF are converted into digital data by a unipolar, analog-to-digital converter, located on  
the mother board.  
A variety of sensors report the physical and operational status of the analyzer’s major components, again  
through the signal processing capabilities of the mother board. These status reports are used as data for  
the CO2 concentration calculation and as trigger events for certain control commands issued by the CPU.  
They are stored in memory by the CPU and in most cases can be viewed but the user via the front panel  
display.  
The CPU communicates with the user and the outside world in a variety of manners:  
Through the analyzer’s touchscreen and LCD display over a clocked, digital, serial I/O bus (using a  
protocol called I2C)  
RS 232 & RS485 Serial I/O channels via Ethernet, Modbus®, Apicom or a terminal emulation program  
Various DCV and DCA analog outputs, and  
Several sets of Digital I/O channels.  
Finally, the CPU issues commands via a series of relays and switches (also over the I2C bus) located on  
a separate printed circuit assembly to control the function of key electromechanical devices such as  
heaters, motors and valves.  
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Analog Outputs  
RS232  
Male  
COM2  
Female  
USB COM  
port  
A1  
A2  
Analog In  
Ethernet  
Optional  
4-20 mA  
Control Inputs:  
Touchscreen  
A3  
A4  
1 – 8  
Display  
Status Outputs:  
1 – 6  
(I2C Bus)  
LVDS  
transmitter board  
Analog  
Outputs  
(D/A)  
External  
Digital I/O)  
PC 104  
CPU Card  
A/D  
Converter  
(V/F)  
Power-Up  
Circuit  
Disk On  
Module  
MOTHER  
BOARD  
Flash Chip  
Box  
Temp  
PC 104 Bus  
Zero/Span  
Valve  
Options  
Thermistor  
Interface  
Internal  
Digital I/O  
I2C  
Bus  
PUMP  
Sensor Inputs  
SAMPLE  
TEMP  
CO2 CO  
RELAY  
BOARD  
2
Sample Flow  
& Pressure  
Sensors  
Optional  
O2 Sensor  
M
R
E
F
E
A
S
CPU Status  
LED  
BENCH  
TEMP  
TEC Control  
IR  
Source  
PHT  
WHEEL  
TEMP  
Photo-  
detector  
SYNC  
DEMOD  
Drive  
Detector  
Output  
GFC  
Motor  
GFC  
Wheel  
O2 SENSOR  
TEMP  
(optional)  
Optical  
Bench  
Schmidt  
Trigger  
Wheel  
Heater  
Segment Sensor  
Bench Heater  
M / R Sensor  
Figure 9-9:  
GFC 7000TA Electronic Block Diagram  
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9.3.2. CPU  
The unit’s CPU card, installed on the motherboard inside the rear panel, is a low power (5 VDC, 720mA  
max), high performance, Vortex 86SX-based microcomputer running Windows CE. Its operation and  
assembly conform to the PC/104 specification.  
Figure 9-10:  
CPU Board  
The CPU includes two types of non-volatile data storage: a Disk on Module (DOM) and an embedded  
flash chip.  
9.3.2.1. Disk-On-Module (DOM)  
The DOM is a 44-pin IDE flash chip with storage capacity to 129 MB. It is used to store the operating  
system, the Teledyne firmware, and most of the operational data generated by the analyzer’s internal  
data acquisition system (DAS - See Section 6.7).  
9.3.2.2. Flash Chip  
This non-volatile, embedded flash chip includes 2MB of storage for calibration data as well as a backup of  
the analyzer configuration. Storing these key data on a separate, less heavily accessed chip significantly  
decreases the chance of data corruption. In the unlikely event that the flash chip should fail, the analyzer  
will continue to operate with just the DOM. However, all configuration information will be lost, requiring  
that the unit be recalibrated.  
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9.3.3. Optical Bench & GFC Wheel  
Electronically, the Model GFC 7000TA’s optical bench, GFC wheel and associated components do more  
than simply measure the amount of CO2 present in the sample chamber. A variety of other critical  
functions are performed here as well.  
9.3.3.1. Temperature Control  
Because the temperature of a gas affects its density and therefore the amount of light absorbed by that  
gas it is important to reduce the effect of fluctuations in ambient temperature on the Model GFC 7000TA’s  
measurement of CO2. To accomplish this the temperature of both the sample chamber and the GFC  
Wheel are maintained at constant temperatures above their normal operating ranges.  
Bench Temperature: To minimize the effects of ambient temperature variations on the sample  
measurement, the sample chamber is heated to 48C (8 degrees above the maximum suggested ambient  
operating temperature for the analyzer). The heat source is a strip heater attached to the underside of  
the chamber housing. The temperature of the sample chamber is sensed by a thermistor attached to the  
sample chamber housing.  
Wheel Temperature: To minimize the effects of temperature variations caused by the near proximity of  
the IR Source to the GFC wheel on the gases contained in the wheel, it is also raised to a high  
temperature level. Because the IR Source itself is very hot, the set point for this heat circuit is 68C. The  
heat source is a cartridge heater implanted into the heat sync on the motor. The temperature of the  
wheel/motor assembly is sensed by a thermistor inserted into the heat sync.  
Both heaters operate off of the AC line voltage supplied to the instrument.  
9.3.3.2. IR Source  
The light used to detect CO2 in the sample chamber is generated by an element heated to approximately  
1100oC producing infrared radiation across a broad band. This radiation is optically filtered after it has  
passed through the GFC Wheel and the sample chamber and just before it reaches the photo-detector to  
eliminate all black body radiation and other extraneous IR emitted by the various components of those  
components.  
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9.3.3.3. GFC Wheel  
Model GFC7000TA Carbon Dioxide Analyzer  
A synchronous AC motor turns the GFC wheel motor. For analyzers operating on 60Hz line power this  
motor turns at 1800 rpm. For those operating on 50Hz line power the spin rate is 1500 rpm. The actual  
spin rate is unimportant within a large rate since a phase lock loop circuit is used to generate timing  
pulses for signal processing.  
In order to accurately interpret the fluctuations of the IR beam after it has passed through the sample gas,  
the GFC wheel several other timing signals are produced by other photo emitters/detectors. These  
devices consist of a combination LED and detector mounted so that the light emitted by the LED shines  
through the same mask on the GFC wheel that chops the IR beam.  
KEY:  
Detection Beam shining  
through MEASUREMENT  
side of GFC Wheel  
Detection Beam shining  
through REFERENCE side  
of GFC Wheel  
IR Detection Ring  
Segment Sensor Ring  
M/R Sensor Ring  
Figure 9-11:  
GFC Light Mask  
M/R Sensor  
This emitter/detector assembly that produces a signal that shines through a portion of the mask that  
allows light to pass for half of a full revolution of the wheel. The resulting light signal tells the analyzer  
whether the IR beam is shining through the measurement or the reference side of the GFC wheel.  
Segment Sensor  
Light from this emitter/detector pair shines through a portion of the mask that is divided into the same  
number of segments as the IR detector ring. It is used by the synchronous / demodulation circuitry of the  
analyzer to latch onto the most stable part of each measurement and reference IR pulse.  
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Measurement  
Pulses  
Reference  
Pulses  
IR Beam  
Pulses  
Segment Sensor  
Pulses  
MR Sensor  
Pulses  
Figure 9-12:  
Segment Sensor and M/R Sensor Output  
Schmidt Triggers  
To ensure that the waveforms produced by the Segment Sensor and the M/R Sensor are properly shaped  
and clean, these signals are passed through a set of Schmidt Triggers circuits.  
9.3.3.4. IR Photo-Detector  
The IR beam is converted into an electrical signal by a cooled solid-state photo-conductive detector. The  
detector is composed of a narrow-band optical filter, a piece of lead-salt crystal whose electrical  
resistance changes with temperature, and a two-stage thermo-electric cooler.  
When the analyzer is on, a constant electrical current is directed through the detector, The IR beam is  
focused onto the detector surface, raising its temperature and lowering its electrical resistance that results  
in a change in the voltage drop across the detector.  
During those times that the IR beam is bright, the temperature of the detector is high; the resistance of  
the detector is correspondingly low and the its output voltage output is low. During those times when the  
IR beam intensity is low or completely blocked by the GFC Wheel mask, the temperature of the detector  
is lowered by the two-stage thermo-electric cooler, increasing the detectors resistance and raising the  
output voltage.  
9.3.4. Synchronous Demodulator (Sync/Demod) Assembly  
9.3.4.1. Overview  
While the photo-detector converts fluctuations of the IR beam into electronic signals, the Sync / Demod  
Board amplifies these signals and converts them into usable information. Initially the output by the photo-  
detector is a complex and continuously changing waveform made up of Measure and Reference pulses.  
The sync/demod board demodulates this waveform and outputs two analog DC voltage signals,  
corresponding to the peak values of these pulses. CO2 MEAS and CO2 REF are converted into digital  
signals by circuitry on the motherboard then used by the CPU to calculate the CO2 concentration of the  
sample gas.  
Additionally the synch/demod board contains circuitry that controls the photo-detector’s thermoelectric  
cooler as well as circuitry for performing certain diagnostic tests on the analyzer.  
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56V  
Bias  
CO2 MEAS  
Variable  
Gain Amp  
Sample &  
Dark  
Switch  
Pre Amp  
Photo-  
detector  
Signal  
Conditioner  
Hold  
Circuits  
TEC Control  
PHT DRIVE  
E-Test  
Generator  
CO2 Reference  
Signal  
(x4)  
Conditioner  
Thermo-Electric  
Cooler  
Control Circuit  
E Test A Gate  
E Test B Gate  
Dark Test Gate  
Measure Gate  
Compact  
Programmable  
Logic Device  
Measure Dark Gate  
Reference Gate  
Reference Dark Gate  
Phase Lock Warning  
M/R Sensor  
From GFC  
Wheel  
Segment  
Sensor  
Segment Clock  
X1 Reference  
E Test Control  
Phase  
Lock  
Loop  
x10  
From CPU  
via Mother  
Board  
10  
Dark Switch  
Control  
X10 Clock  
M/R  
Segment  
Status LED  
Status LED  
Phase Lock  
Figure 9-13:  
GFC 7000TA Sync / Demod Block Diagram  
9.3.4.2. Signal Synchronization and Demodulation  
The signal emitted by the IR photo-detector goes through several stages of amplification before it can be  
accurately demodulated. The first is a pre-amplification stage that raises the signal to levels readable by  
the rest of the synch/demod board circuitry. The second is a variable amplification stage that is adjusted  
at the factory to compensate for performance variations of mirrors, detectors, and other components of  
the optical bench from instrument to instrument.  
The workhorses of the sync/demod board are the four sample-and-hold circuits that capture various  
voltage levels found in the amplified detector signal needed to determine the value of CO2 MEAS and  
CO2 REF. They are activated by logic signals under the control of a compact programmable logic device  
(PLD), which in turn responds to the output of the Segment Sensor and M/R Sensor described in  
Figure 10–11.  
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The four sample and hold circuits are:  
DESIGNATION  
ACTIVE WHEN:  
IR BEAM PASSING THROUGH  
SEGMENT SENSOR PULSE IS:  
Measure Gate  
Measure Dark Gate  
Reference Gate  
MEASUREMENT cell of GFC Wheel  
MEASUREMENT cell of GFC Wheel  
REFERENCE cell of GFC Wheel  
REFERENCE cell of GFC Wheel  
HIGH  
LOW  
HIGH  
LOW  
Reference Dark Gate  
Timing for activating the Sample and Hold circuits is provided by a phase lock loop circuit (PLL). Using  
the segment sensor output as a reference signal the PLL generates clock signal at ten times that  
frequency. This faster clock signal is used by the PLD to make the sample and hold circuits capture the  
signal during the center portions of the detected waveform, ignore the rising and falling edges of the  
detector signal.  
Sample & Hold  
Active  
Detector  
Output  
Sample & Hold  
Inactive  
Figure 9-14:  
Sample & Hold Timing  
9.3.4.3. Sync/Demod Status LED’s  
The following two status LED’s located on the synch/demod board provide additional diagnostic tools for  
checking the GFC wheel rotation.  
Table 9-1: Sync/Demod Status LED Activity  
LED  
D1  
FUNCTION  
STATUS OK  
FAULT STATUS  
M/R Sensor Status  
LED flashes approximately  
2/second  
LED is stuck  
ON or OFF  
D2  
Segment Sensor  
Status  
LED flashes approximately  
6/second  
LED is stuck  
ON or OFF  
See Section 11.1.4 for more information.  
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9.3.4.4. Photo-Detector Temperature Control  
The synch/demod board also contains circuitry that controls the IR photo-detector’s thermoelectric  
coolers. A drive voltage, PHT DRIVE, is supplied to the coolers by the synch/demod board which is  
adjusted by the synch/demod board based on a return signal called TEC control which alerts informs the  
synch/demod board of the detector’s temperature. The warmer the detector, the harder the coolers are  
driven.  
PHT DRIVE is one of the Test Functions viewable by the user via the front panel. Press <TST or TST>  
until it appears on the display.  
9.3.4.5. Dark Calibration Switch  
This switch initiates the Dark Calibration procedure. When initiated by the user (See Section 6.13.6 for  
more details), the dark calibration process opens this switch, interrupting the signal from the IR photo-  
detector. This allows the analyzer to measure any offset caused by the synch/demod board circuitry.  
9.3.4.6. Electric Test Switch  
When active this circuit generates a specific waveform intended to simulate the function of the IR photo-  
detector but with a known set of value which is substituted for the detector’s actual signal via the dark  
switch. It may also be initiated by the user (See Section 6.13.5 for more details).  
9.3.5. Relay Board  
By actuating various switches and relays located on this board, the CPU controls the status of other key  
components. The relay board receives instructions in the form of digital signals over the I2C bus,  
interprets these digital instructions and activates its various switches and relays appropriately.  
9.3.5.1. Heater Control  
The two heaters attached to the sample chamber housing and the GFC wheel motor are controlled by  
solid state relays located on the relay board.  
The GFC wheel heater is simply turned on or off, however control of the bench heater also includes  
circuitry that selects which one of its two separate heating elements is activated depending on whether  
the instrument is running on 100 VAC, 115 VAC or 230 VAC line power.  
9.3.5.2. GFC Wheel Motor Control  
The GFC wheel operates from an AC voltage supplied by a multi-input transformer located on the relay  
board. The step-down ratio of this transformer is controlled by factory-installed jumpers to adjust for 100  
VAC, 115 VAC or 230 VAC line power. Other circuitry slightly alters the phase of the AC power supplied  
to the motor during start up based on whether line power is 50Hz or 60 Hz.  
Normally, the GFC Wheel Motor is always turning while the analyzer is on. A physical switch located on  
the relay board can be used to turn the motor off for certain diagnostic procedures.  
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9.3.5.3. Zero/Span Valve Options  
Any zero/span valve options installed in the analyzer are controlled by a set of electronic switches located  
on the relay board. These switches, under CPU control, supply the +12VDC needed to activate each  
valve’s solenoid.  
9.3.5.4. IR Source  
The Relay board supplies a constant 11.5VDC to the IR Source. Under normal operation the IR source is  
always on.  
9.3.5.5. Status LEDs  
Eight LEDs are located on the analyzer’s relay board to show the current status on the various control  
functions performed by the relay board (see Figure 10-14). They are:  
Table 9-2: Relay Board Status LED’s  
LED  
COLOR  
FUNCTION  
STATUS WHEN LIT  
STATUS WHEN UNLIT  
D1  
RED  
Watchdog Circuit  
Cycles On/Off Every 3 Seconds under direct control of the  
analyzer’s CPU.  
D2  
D3  
D4  
D5  
YELLOW  
YELLOW  
YELLOW  
GREEN  
Wheel Heater  
Bench Heater  
Spare  
HEATING  
HEATING  
N/A  
NOT HEATING  
NOT HEATING  
N/A  
Sample/Cal Gas  
Valve Option  
Valve Open to CAL GAS  
FLOW  
Valve Open to SAMPLE GAS  
FLOW  
D6  
D7  
D8  
GREEN  
GREEN  
GREEN  
Zero/Span Gas  
Valve Option  
Valve Open to SPAN GAS  
FLOW  
Valve Open to ZERO GAS FLOW  
Shutoff Valve  
Option  
Valve Open to CAL GAS  
FLOW  
Valve CLOSED to CAL GAS  
FLOW  
IR SOURCE  
Source ON  
Source OFF  
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DC VOLTAGE TEST  
POINTS  
STATUS LED’s  
RELAY PCA  
Figure 9-15:  
Location of relay board Status LED’s  
9.3.5.6. I2C Watch Dog Circuitry  
Special circuitry on the relay board monitors the activity on the I2C bus and drives LED D1. Should this  
LED ever stay ON or OFF for 30 seconds, the watchdog circuit will automatically shut of all valves as well  
as turn off the IR Source and all heaters. The GFC wheel motor will still be running as will the Sample  
Pump, which is not controlled by the relay board.  
9.3.6. Mother Board  
This printed circuit assembly provides a multitude of functions including, A/D conversion, digital  
input/output, PC-104 to I2C translation, temperature sensor signal processing and is a pass through for  
the RS-232 and RS-485 signals.  
9.3.6.1. A to D Conversion  
Analog signals, such as the voltages received from the analyzer’s various sensors, are converted into  
digital signals that the CPU can understand and manipulate by the analog to digital converter (A/D).  
Under the control of the CPU, this functional block selects a particular signal input (e.g. BOX TEMP, CO2  
MEAS, CO2 REF, etc.) and then coverts the selected voltage into a digital word.  
The A/D consists of a voltage-to-frequency (V-F) converter, a programmable logic device (PLD), three  
multiplexers, several amplifiers and some other associated devices. The V-F converter produces a  
frequency proportional to its input voltage. The PLD counts the output of the V-F during a specified time  
period, and sends the result of that count, in the form of a binary number, to the CPU.  
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The A/D can be configured for several different input modes and ranges but in the GFC 7000TA is used  
in uni-polar mode with a +5 V full scale. The converter includes a 1% over and under-range. This allows  
signals from –0.05 V to +5.05 V to be fully converted.  
For calibration purposes, two reference voltages are supplied to the A/D converter: Reference Ground  
and +4.096 VDC. During calibration, the device measures these two voltages, outputs their digital  
equivalent to the CPU. The CPU uses these values to compute the converter’s offset and slope and uses  
these factors for subsequent conversions.  
See Section 6.13.4 for instructions on performing this calibration.  
9.3.6.2. Sensor Inputs  
The key analog sensor signals are coupled to the A/D through the master multiplexer from two  
connectors on the motherboard. 100K terminating resistors on each of the inputs prevent cross talk from  
appearing on the sensor signals.  
CO2 Measure and Reference  
These are the primary signals that are used in the computation of the CO2 concentration. They are the  
demodulated IR-sensor signals from the sync demodulator board.  
Sample Pressure and Flow  
These are analog signals from two sensors that measure the pressure and flow rate of the gas stream at  
the outlet of the sample chamber. This information is used in two ways. First, the sample pressure is  
used by the CPU to calculate CO2 Concentration. Second, the pressure and flow rate are monitored as a  
test function to assist the user in predicting and troubleshooting failures.  
9.3.6.3. Thermistor Interface  
This circuit provides excitation, termination and signal selection for several negative-coefficient, thermistor  
temperature sensors located inside the analyzer. They are:  
Sample Temperature Sensor  
The source of this signal is a thermistor located inside the sample chamber of the Optical Bench. It  
measures the temperature of the sample gas in the chamber. This data is used to during the calculation  
of the CO2 concentration value.  
Bench Temperature Sensor  
This thermistor, attached to the sample chamber housing, reports the current temperature of the chamber  
housing to the CPU as part of the bench heater control loop.  
Wheel Temperature Sensor  
This thermistor (attached to the heat-sync on the GFC wheel motor assembly) reports the current  
temperature of the wheel/motor assembly to the CPU as part of the Wheel Heater control loop.  
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Box Temperature Sensor  
A thermistor is attached to the motherboard. It measures the analyzer’s inside temperature. This  
information is stored by the CPU and can be viewed by the user for troubleshooting purposes via the front  
panel display (See Section 11.1.2).  
9.3.6.4. Analog Outputs  
The analyzer comes equipped with four analog outputs: A1, A2, A3 and A4. . In its standard  
configuration, the analyzer comes with all four of these channels set up to output a DC voltage. However,  
4-20mA current loop drivers can be purchased for the first three of these outputs: A2, A2 & A3.  
A2 and A1 Output  
The first two, A2 and A1 are normally set up to operate in parallel so that the same data can be sent to  
two different recording devices. While the names imply that one should be used for sending data to a  
chart recorder and the other for interfacing with a data logger, either can be used for both applications.  
Both of these channels output a signal that is proportional to the CO2 concentration of the sample gas.  
The A1 and A2 outputs can be slaved together or set up to operated independently. A variety of scaling  
factors are available, See Section 6.13.4 for information on setting the range type and scaling factors for  
these output channels.  
A3 Output  
Analog output channel A3 is only active when the O2 sensor option is installed in the GFC 7000TA. In this  
case, the currently measured O2 concentration is output.  
Test Function Output  
The fourth analog output, labeled A4 is special. It can be set by the user (See Section 6.9.9) to carry the  
current signal level of any one of the parameters accessible through the SETUP MORE DIAG   
TEST CHAN OUTPUT submenu (See Section 6.13.9) of the unit’s software.  
Output Loop-back  
All four analog outputs are connected back to the A/D converter through a Loop-back circuit. This permits  
the voltage outputs to be calibrated by the CPU without need for any additional tools or fixtures.  
9.3.6.5. Internal Digital I/O  
This channel is used to communicate digital status and control signals about the operation of key  
components of the Optical Bench. The CPU sends signals to the synch/demod board that initiate the  
ELECTRICAL TEST and DARK CALIBRATION procedures. Likewise, the synch/demod board uses this  
interface to send the SYNC warning signal to the CPU (See Sections 6.9.5, 6.9.6 and 11.1.1).  
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9.3.6.6. External Digital I/O  
This External Digital I/O performs two functions: status outputs and control inputs.  
Status Outputs  
Logic-Level voltages are output through an optically isolated 8-pin connector located on the rear panel of  
the analyzer. These outputs convey good/bad and on/off information about certain analyzer conditions.  
They can be used to interface with certain types of programmable devices (See Section 6.13.1.1).  
Control Inputs  
By applying +5VDC power supplied from an external source such as a PLC or Data logger (See Section  
6.13.1.2), Zero and Span calibrations can be initiated by contact closures on the rear panel.  
9.3.7. I2C Data Bus  
An I2C data bus is used to communicate data and commands between the CPU and the  
touchscreen/display interface and the relay board. I2C is a two-wire, clocked, digital serial I/O bus that is  
used widely in commercial and consumer electronic systems. A transceiver on the motherboard converts  
data and control signals from the PC-104 bus to I2C. The data is then fed to the touchscreen/display  
interface and finally onto the relay board.  
Interface circuits on the touchscreen/display interface and relay boards convert the I2C data to parallel  
inputs and outputs. An additional, interrupt line from the touchscreen to the motherboard allows the CPU  
to recognize and service button presses on the touchscreen.  
Power up Circuit  
This circuit monitors the +5V power supply during start-up and sets the Analog outputs, external digital  
I/O ports, and I2C circuitry to specific values until the CPU boots and the instrument software can  
establish control.  
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9.3.8. Power Supply/ Circuit Breaker  
The analyzer operates on 100 VAC, 115 VAC or 230 VAC power at either 50Hz or 60Hz. Individual units  
are set up at the factory to accept any combination of these five attributes. As illustrated in Figure 10-15,  
power enters the analyzer through a standard IEC 320 power receptacle located on the rear panel of the  
instrument. From there it is routed through the On/Off switch located in the lower right corner of the Front  
Panel. A 6.75 Amp circuit breaker is built into the ON/OFF Switch.  
AC power is distributed directly to the sample gas pump. The bench and GFC wheel heaters as well as  
the GFC wheel receive AC power via the relay board.  
AC Line power is converted stepped down and converted to DC power by two DC power supplies. One  
supplies +12 VDC, for valves and the IR source, while a second supply provides +5 VDC and ±15 VDC  
for logic and analog circuitry. All DC voltages are distributed via the relay board.  
CAUTION  
Should the AC power circuit breaker trip, investigate and correct the condition causing  
this situation before turning the analyzer back on.  
ON/OFF  
Touchscreen  
Display  
SWITCH  
AC POWER  
ENTRANCE  
Pressure  
Sensors  
LVDS  
transmittedr board  
PS 1 (+5 VDC; ±15 VDC)  
CPU  
RELAY  
KEY  
AC POWER  
DC POWER  
BOARD  
Mother  
Board  
PS 2 (+12 VDC)  
Sync/Demod  
IR Source  
Pump  
Cooling Fan  
GFC Wheel  
Motor  
Valve Options  
M/R &  
Segment  
Sensors  
Heaters  
Figure 9-16:  
Power Distribution Block Diagram  
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9.4. Front Panel Touchscreen/Display Interface  
Users can input data and receive information directly through the front panel touchscreen display. The  
LCD display is controlled directly by the CPU board. The touchscreen is interfaced to the CPU by means  
of a touchscreen controller that connects to the CPU via the internal USB bus and emulates a computer  
mouse.  
Figure 9-17:  
Front Panel and Display Interface Block Diagram  
9.4.1. LVDS Transmitter Board  
The LVDS (low voltage differential signaling) transmitter board converts the parallel display bus to a  
serialized, low voltage, differential signal bus in order to transmit the video signal to the LCD interface  
PCA.  
9.4.2. Front Panel Touchscreen/Display Interface PCA  
The front panel touchscreen/display interface PCA controls the various functions of the display and  
touchscreen. For driving the display it provides connection between the CPU video controller and the  
LCD display module. This PCA also contains:  
power supply circuitry for the LCD display module  
a USB hub that is used for communications with the touchscreen controller and the two front panel  
USB device ports  
the circuitry for powering the display backlight  
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9.5. Software Operation  
The Model GFC 7000TA Gas Filter Correlation Carbon Dioxide Analyzer has a high performance,  
VortexX86-based microcomputer running Windows CE. Inside Windows CE, special software developed  
by Teledyne Instruments interprets user commands via the various interfaces, performs procedures and  
tasks, stores data in the CPU’s various memory devices and calculates the concentration of the sample  
gas.  
Windows CE  
API FIRMWARE  
Analyzer Operations  
Calibration Procedures  
Configuration Procedures  
Autonomic Systems  
Diagnostic Routines  
Memory Handling  
DAS Records  
Calibration Data  
System Status Data  
PC/104 BUS  
ANALYZER  
HARDWARE  
Interface Handling  
Sensor input Data  
Touchscreen/Display  
Analog Output Data  
RS232 & RS485  
Measurement  
Algorithm  
PC/104 BUS  
External Digital I/O  
Linearization Table  
Figure 9-18:  
Basic Software Operation  
9.5.1. Adaptive Filter  
The GFC 7000TA software processes the CO2 MEAS and CO2 REF signals, after they are digitized by  
the motherboard, through an adaptive filter built into the software. Unlike other analyzers that average  
the output signal over a fixed time period, the GFC 7000TA averages over a set number of samples,  
where each sample is 0.2 seconds. This is technique is known as boxcar averaging. During operation,  
the software automatically switches between two different length filters based on the conditions at hand.  
Once triggered, the short filter remains engaged for a fixed time period to prevent chattering.  
During conditions of constant or nearly constant concentration the software, by default, computes an  
average of the last 750 samples, or approximately 150 seconds. This provides the calculation portion of  
the software with smooth stable readings. If a rapid change in concentration is detected the filter  
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includes, by default, the last 48 samples, approximately 10 seconds of data, to allow the analyzer to more  
quickly respond. If necessary, these boxcar lengths can be changed between 1 and 1000 samples but  
with corresponding tradeoffs in rise time and signal-to-noise ratio (contact customer service for more  
information).  
Two conditions must be simultaneously met to switch to the short filter. First the instantaneous  
concentration must exceed the average in the long filter by a fixed amount. Second the instantaneous  
concentration must exceed the average in the long filter by a portion, or percentage, of the average in the  
long filter.  
9.5.2. Calibration - Slope and Offset  
Calibration of the analyzer is performed exclusively in software.  
During instrument calibration (see Section 7) the user enters expected values for zero and span via the  
front panel touchscreen and commands the instrument to make readings of calibrated sample gases for  
both levels. The readings taken are adjusted, linearized, and compared to the expected values, With this  
information the software computes values for instrument slope and offset and stores these values in  
memory for use in calculating the CO2 concentration of the sample gas.  
The instrument slope and offset values recorded during the last calibration can be viewed by pressing the  
following touchscreen button sequence:  
SAMPLE  
=XX.XX  
RANGE = 50.0 MGM  
CO2  
CO2  
SAMPLE  
=XX.XX  
OFFSET = 0.000  
SLOPE = 1.000  
CO2  
CO2  
SAMPLE  
=XX.XX  
TIME = 16:23:34  
SAMPLE  
=XX.XX  
9.5.3. Measurement Algorithm  
Once the IR photo-detector is signal is demodulated into CO2 MEAS and CO2 REF by the sync/demod  
board and converted to digital data by the motherboard the GFC 7000TA analytical software calculates  
the ratio between CO2 MEAS and CO2 REF. This value is compared to a look-up table is used, with  
interpolation, to linearize the response of the instrument. The linearized concentration value is combined  
with calibration slope and offset values, then normalized for changes in sample gas pressure to produce  
the final CO2 concentration. This is the value that is displayed on the instrument front panel display and is  
stored in memory by the analyzer’s DAS system.  
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9.5.4. Temperature and Pressure Compensation  
Changes in pressure can have a noticeable, effect on the CO2 concentration calculation. To account for  
this, the Model GFC 7000TA software includes a feature which allows the instrument to compensation of  
the CO2 calculations based on changes in ambient pressure.  
The TPC feature multiplies the analyzer’s CO2 concentration by a factor which is based on the difference  
between the ambient pressure of the sample gas normalized to standard atmospheric pressure. As  
ambient pressure increases, the compensated CO2 concentration is increased.  
9.5.5. Internal Data Acquisition System (DAS)  
The DAS is designed to implement predictive diagnostics that stores trending data for users to anticipate  
when an instrument will require service. Large amounts of data can be stored in non-volatile memory and  
retrieved in plain text format for further processing with common data analysis programs. The DAS has a  
consistent user interface in all Teledyne Instruments analyzers. New data parameters and triggering  
events can be added to the instrument as needed.  
Depending on the sampling frequency and the number of data parameters the DAS can store several  
months of data, which are retained even when the instrument is powered off or a new firmware is  
installed. The DAS permits users to access the data through the instrument’s front panel or the remote  
interface. The latter can automatically download stored data for further processing. For information on  
using the DAS, refer to Sections 6.12.  
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10. TROUBLESHOOTING & REPAIR PROCEDURES  
This contains a variety of methods for identifying the source of performance problems with the analyzer.  
Also included in this are procedures that are used in repairing the instrument.  
CAUTION  
The operations outlined in this section are to be performed by qualified maintenance  
personnel only.  
CAUTION  
Risk of electrical shock. Disconnect power before performing the following  
operations.  
10.1. General Troubleshooting Hints  
The analyzer has been designed so that problems can be rapidly detected, evaluated and repaired.  
During operation, the analyzer continuously performs self-check diagnostics and provides the ability to  
monitor the key operating parameters of the instrument without disturbing monitoring operations.  
A systematic approach to troubleshooting will generally consist of the following four steps:  
1. Note any WARNING MESSAGES and take corrective action as required.  
2. Examine the values of all TEST functions and compare to factory values. Note any major  
deviations from the factory values and take correction action as required.  
3. Use the internal electronic status LED’s to determine whether the CPU and I2C buses are  
running, and if the sync/demodulator and relay board are operating properly. Verify that the DC  
power supplies are operating properly by checking the voltage test points on the relay board.  
Please note that the analyzer’s DC power wiring is color-coded and these colors match the color  
of the corresponding test points on the relay board.  
4. SUSPECT A LEAK FIRST! Data from Teledyne Instruments’ service department indicates that  
50% of all problems are eventually traced to leaks in the pneumatic connections and gas lines of  
the analyzer itself, the source of zero air, span gases or sample gas delivery system.  
Check for gas flow problems such as clogged or blocked internal/external gas lines, damaged  
seals, punctured gas lines, a damaged pump diaphragm, etc.  
5. Follow the procedures defined in Section 11.5 for confirming that the analyzer’s basic  
components are working (power supplies, CPU, relay board, sync/demod board,  
touchscreen/display, GFC wheel motor, etc.). See Figure 3-3 for general layout of components  
and sub-assemblies in the analyzer. See the wiring list and diagram in Appendix D of this  
manual.  
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10.1.1. Interpreting WARNING Messages  
The most common and/or serious instrument failures will result in a warning message being displayed on  
the front panel. Table 11-1 lists warning messages, along with their meaning and recommended  
corrective action.  
It should be noted that if more than two or three warning messages occur at the same time, it is often an  
indication that some fundamental analyzer sub-system (power supply, relay board, motherboard) has  
failed rather than indication of the specific failures referenced by the warnings. In this case, it is  
recommended that proper operation of power supplies (See Section 10.5.2), the relay board (See Section  
10.5.6), and the A/D Board (See Section11.4.7.1) be confirmed before addressing the specific warning  
messages.  
The analyzer will alert the user that a Warning message is active by flashing the FAULT LED and  
displaying the Warning message in the Param field along with the CLR button (press to clear Warning  
message). The MSG button displays if there is more than one warning in queue or if you are in the TEST  
menu and have not yet cleared the message. The following display/touchscreen examples provide an  
illustration of each:  
The analyzer will also alert the user via the Serial I/O COM port(s) and cause the FAULT LED on the front  
panel to blink.  
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To view or clear the various warning messages press:  
SAMPLE  
WHEEL TEMP WARNING  
CAL MSG  
CO2 = XX.XX  
CLR SETUP  
TEST deactivates Warning  
Messages until New warning(s)  
are activated  
TEST  
MSG activates Warning  
SAMPLE  
RANGE=500.00 PPM  
MSG  
CO2 = XX.XX  
CLR SETUP  
Messages.  
<TST TST> keys replaced with  
< TST TST > CAL  
TEST key  
SAMPLE  
WHEEL TEMP WARNING  
CO2 = XX.XX  
Press CLR to clear the  
message currently being  
Displayed.  
< TST TST > CAL  
MSG  
CLR SETUP  
If more than one warning is  
active the next message will  
take its place  
Once the last warning has been  
cleared, the analyzer returns to  
SAMPLE Mode  
Make sure warning messages  
are not due to  
legitimate problems..  
Figure 10-1:  
Viewing and Clearing Warning Messages  
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Table 10-1: Warning Messages - Indicated Failures  
WARNING  
FAULT CONDITION  
MESSAGE  
POSSIBLE CAUSES  
Bad bench heater  
Bad bench temperature sensor  
The optical bench temp is  
BENCH TEMP  
WARNING  
Bad relay controlling the bench heater  
Entire relay board is malfunctioning  
controlled at 48 2 °C.  
I2C bus malfunction  
NOTE: Box temperature typically runs ~7oc warmer than  
ambient temperature.  
BOX TEMP  
WARNING  
Box Temp is  
Poor/blocked ventilation to the analyzer.  
Stopped exhaust-fan  
< 5 °C or > 48 °C.  
Ambient temperature outside of specified range  
Measured concentration value is too high or low.  
Concentration slope value to high or too low  
Measured concentration value is too high.  
Concentration offset value to high.  
Failed disk on chip  
CANNOT DYN  
SPAN  
CANNOT DYN  
ZERO  
CONFIG  
INITIALIZED  
Dynamic Span operation failed  
Dynamic Zero operation failed  
Configuration and Calibration data  
reset to original Factory state.  
Concentration alarm 1 is enabled  
and the measured CO2 level is ≥  
the set point.  
User erased data  
CONC ALRM1  
WARNING  
Concentration alarm 2 is enabled  
and the measured CO2 level is ≥  
the set point.  
CONC ALRM2  
WARNING  
Failed disk on chip  
User cleared data  
DATA INITIALIZED  
Data Storage in DAS was erased  
Failed IR photo-detector  
PHOTO TEMP  
WARNING  
PHT DRIVE is  
>4800 mVDC  
Failed sync/demod board  
IR photo-detector improperly attached to the sample chamber  
Bench temp too high.  
Motherboard not detected on  
power up.  
Warning only appears on serial i/o com port(s)  
Front panel display will be frozen, blank or will not respond.  
Massive failure of mother board  
REAR BOARD NOT  
DET  
I2C bus failure  
RELAY BOARD  
WARN  
The CPU cannot communicate with  
the Relay Board.  
Failed relay board  
Loose connectors/wiring  
Failed sample pump  
Blocked sample inlet/gas line  
Dirty particulate filter  
SAMPLE FLOW  
WARN  
Sample flow rate is < 500 cc/min or  
> 1000 cc/min.  
Leak downstream of critical flow orifice  
Failed flow sensor/circuitry  
If sample pressure is < 10 in-hg:  
o Blocked particulate filter  
o Blocked sample inlet/gas line  
o Failed pressure sensor/circuitry  
SAMPLE PRES  
WARN  
Sample Pressure is <10 in-Hg or  
> 35 in-Hg  
Normally 29.92 in-Hg at sea level  
decreasing at 1 in-Hg per 1000 ft of  
altitude (with no flow – pump  
disconnected).  
If sample pressure is > 35 in-hg:  
o Pressurized sample gas. Install vent  
o Blocked vent line on pressurized sample/zero/span gas  
supply  
o Bad pressure sensor/circuitry  
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Table 11-1: Warning Messages – Indicated Failures (cont.)  
WARNING  
MESSAGE  
FAULT CONDITION  
POSSIBLE CAUSES  
SAMPLE TEMP  
WARN  
Sample temperature is < 10oC or >  
100oC.  
Ambient temperature outside of specified range  
Failed bench heater  
Failed bench temperature sensor  
Relay controlling the bench heater  
Failed relay board  
I2C bus  
SOURCE  
WARNING  
Occurs when CO2 Ref is <1250  
mVDC or >4950 mVDC.  
GFC wheel stopped  
Failed sync/demod board  
If status LED’s on the sync/demod board ARE flashing the  
cause is most likely a failed:  
IR source  
Either of these conditions will result  
in an invalid M/R ratio.  
Relay board  
I2C bus  
IR photo-detector  
SYSTEM RESET  
The computer has rebooted.  
This message occurs at power on. If you have not cycled the  
power on your instrument:  
o Failed +5 VDC power,  
o Fatal error caused software to restart  
o Loose connector/wiring  
WHEEL TEMP  
WARNING  
The filter wheel temperature is  
Blocked cooling vents below GFC Assembly. Make sure that  
adequate clear space beneath the analyzer.  
Analyzer’s top cover removed  
Wheel heater  
controlled at 68 2 °C  
Wheel temperature sensor  
Relay controlling the wheel heater  
Entire relay board  
I2C bus  
10.1.2. Fault Diagnosis with TEST Functions  
Besides being useful as predictive diagnostic tools, the test functions viewable from the front panel can  
be used to isolate and identify many operational problems when combined with a thorough understanding  
of the analyzer’s theory of operation (see Section 10).  
The acceptable ranges for these test functions are listed in the “Nominal Range” column of the analyzer  
Final Test and Validation Data Sheet (p/n 04307) shipped with the instrument. Values outside these  
acceptable ranges indicate a failure of one or more of the analyzer’s subsystems. Functions whose  
values are still within the acceptable range but have significantly changed from the measurement  
recorded on the factory data sheet may also indicate a failure. A worksheet has been provided in  
Appendix C to assist in recording the value of these test functions.  
Table 11-2 contains some of the more common causes for these values to be out of range.  
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Table 10-2: Test Functions - Indicated Failures  
TEST  
FUNCTIONS  
INDICATED FAILURE(S)  
Time of day clock is too fast or slow: To adjust See Section 6.6.  
Battery in clock chip on CPU board may be dead.  
TIME  
Incorrectly configured measurement range(s) could cause response problems with a Data logger or chart  
recorder attached to one of the analog output.  
If the Range selected is too small, the recording device will over range.  
If the Range is too big, the device will show minimal or no apparent change in readings.  
Indicates noise level of instrument or CO2 concentration of sample gas (See Section 10.4.2 for causes).  
RANGE  
STABIL  
If the value displayed is too high the IR Source has become brighter. Adjust the variable gain  
potentiometer on the sync/demod board  
If the value displayed is too low or constantly changing and the CO2 REF is OK:  
o Failed multiplexer on the mother board  
o Failed sync/demod board  
o Loose connector or wiring on sync/demod board  
Flow of purge gas to the GFC wheel housing may have stopped  
If the value displayed is too low or constantly changing and the CO2 REF is BAD:  
o GFC wheel stopped or rotation is too slow  
o Failed sync/demod board IR source  
CO2 MEAS  
&
CO2 REF  
o Failed IR source  
o Failed relay board  
o Failed I2C bus  
o Failed IR photo-detector  
When the analyzer is sampling zero air and the ratio is too low:  
o The reference cell of the GFC wheel is contaminated or leaking.  
o The alignment between the GFC wheel and the segment sensor, the M/R sensor or both is  
incorrect.  
MR RATIO  
o Failed sync/demod board  
o Flow of purge gas to the GFC wheel housing may have stopped  
When the analyzer is sampling zero air and the ratio is too high:  
o Zero air is contaminated  
o Failed IR photo-detector  
See Table 11-1 for SAMPLE PRES WARN  
PRES  
Check for gas flow problems. see Section 11.1.6  
SAMPLE FL  
SAMPLE TEMP should be close to BENCH TEMP. Temperatures outside of the specified range or  
oscillating temperatures are cause for concern  
SAMPLE  
TEMP  
Bench temp control improves instrument noise, stability and drift. Temperatures outside of the specified  
range or oscillating temperatures are cause for concern. See Table 11-1 for BENCH TEMP WARNING  
Wheel temp control improves instrument noise, stability and drift. Outside of set point or oscillating  
temperatures are cause for concern. See Table 11-1 for WHEEL TEMP WARNING  
If the box temperature is out of range, check fan in the power supply module. Areas to the side and rear  
of instrument should allow adequate ventilation. See Table 11-1 for BOX TEMP WARNING.  
If this drive voltage is out of range it may indicate one of several problems:  
BENCH TEMP  
WHEEL TEMP  
BOX TEMP  
- A poor mechanical connection between the various components in inside the detector housing  
- An electronic failure of the IR Photo-Detector’s built-in cooling circuitry, or;  
PHT DRIVE  
- A temperature problem inside the analyzer chassis. In this case other temperature warnings would also  
be active such as BENCH TEMP WARNING or BOX TEMP WARNING.  
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TEST  
FUNCTIONS  
INDICATED FAILURE(S)  
Values outside range indicate  
Contamination of the zero air or span gas supply  
Instrument is miss-calibrated  
Blocked gas flow  
SLOPE  
Contaminated or leaking GFC wheel (either chamber)  
Faulty IR photo-detector  
Faulty sample faulty IR photo-detector pressure sensor (P1) or circuitry  
Invalid M/R ratio (see above)  
Bad/incorrect span gas concentration due.  
Values outside range indicate  
Contamination of the zero air supply  
Contaminated or leaking GFC wheel (either chamber)  
Faulty IR photo-detector  
OFFSET  
10.1.3. Using the Diagnostic Signal I/O Function  
The Signal I/O parameters found under the DIAG Menu (See Section 6.9.2 and Appendix A) combined  
with a thorough understanding of the instrument’s Theory of Operation (found in Section 10) are useful for  
troubleshooting in three ways:  
The technician can view the raw, unprocessed signal level of the analyzer’s critical inputs and  
outputs.  
All of the components and functions that are normally under algorithmic control of the CPU can be  
manually exercised.  
The technician can directly control the signal level of the Analog and Digital Output signals.  
This allows the technician to systematically observe the effect of directly controlling these signals on the  
operation of the analyzer. Below in Figure 11-2 is an example of how to use the signal I/O menu to view  
the raw voltage of an input signal or to control the state of an output voltage or control signal. The  
specific parameter will vary depending on the situation.  
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SAMPLE*  
RANGE = 500.000 PPM  
CO2 =X.XXX  
< TST TST > CAL  
SETUP  
SETUP X.X  
PRIMARY SETUP MENU  
CFG DAS RNGE PASS CLK MORE  
EXIT  
SETUP X.X SECONDARY SETUP MENU  
COMM VARS DIAG  
EXIT  
SAMPLE  
ENTER SETUP PASS : 818  
8
8
1
ENTR EXIT  
DIAG  
SIGNAL I/O  
PREV NEXT  
DIAG I/O  
ENTR  
EXIT  
0 ) EXT_ZERO_CAL=ON  
PREV NEXT JUMP  
PRNT EXIT  
If parameter is an  
input signal  
If parameter is an output  
signal or control  
DIAG I/O  
28) SAMPLE_PRESSURE=2540 MV  
DIAG I/O  
22) WHEEL_HTR=ON  
PREV NEXT JUMP  
PRNT EXIT  
PREV NEXT JUMP  
ON PRNT EXIT  
Toggles parameter  
ON/OFF  
DIAG I/O  
22) WHEEL_HTR=OFF  
PREV NEXT JUMP  
OFF PRNT EXIT  
Exit returns to  
DIAG display & all values  
return to software control  
Figure 10-2:  
Example of Signal I/O Function  
10.1.4. Internal Electronic Status LEDs  
Several LED’s are located inside the instrument to assist in determining if the analyzer’s CPU, I2C bus  
and relay board, GFC wheel and the sync/demodulator board are functioning properly.  
10.1.4.1. CPU Status Indicator  
DS5, a red LED, that is located on upper portion of the motherboard, just to the right of the CPU board,  
flashes when the CPU is running the main program loop. After power-up, approximately 30 to 60  
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seconds, DS5 should flash on and off. If characters are written to the front panel display but DS5 does  
not flash then the program files have become corrupted. If after 30 – 60 seconds neither the DS5 is  
flashing or no characters have been written to the front panel display then the CPU is bad and must be  
replaced.  
Motherboard  
CPU Status LED  
Figure 10-3:  
CPU Status Indicator  
10.1.4.2. Sync Demodulator Status LED’s  
Two LEDs located on the Sync/Demod Board and are there to make it obvious that the GFC Wheel is  
spinning and the synchronization signals are present:  
Table 10-3: Sync/Demod Board Status Failure Indications  
LED  
FUNCTION  
M/R Sensor Status  
(Flashes slowly)  
FAULT STATUS  
INDICATED FAILURE(S)  
GFC Wheel is not turning  
M/R Sensor on Opto-Pickup Board failed  
Sync/Demod Board failed  
LED is stuck  
ON or OFF  
D1  
JP 4 Connector/Wiring faulty  
Failed/Faulty +5 VDC Power Supply (PS1)  
GFC Wheel is not turning  
Segment Sensor on Opto-Pickup Board failed  
Sync/Demod Board failed  
JP 4 Connector/Wiring faulty  
Failed/Faulty +5 VDC Power Supply (PS1)  
Segment Sensor  
Status  
LED is stuck  
ON or OFF  
D2  
(Flashes quickly)  
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D1 – M/R Sensor Status  
JP4 Connector to Opto-Pickup  
Board  
D2 – Segment Sensor Status  
Figure 10-4:  
Sync/Demod Board Status LED Locations  
10.1.4.3. Relay Board Status LEDs  
There are eight LEDs located on the Relay Board. The most important of which is D1 is the most  
important LED, which indicates the health of the I2C bus. If D1 is blinking the other faults following LEDs  
can be used in conjunction with DIAG menu signal I/O to identify hardware failures of the relays and  
switches on the relay (See Section 6.9.2 and Appendix D).  
Table 10-4: I2C Status LED Failure Indications  
LED  
FUNCTION  
FAULT STATUS  
INDICATED FAILURE(S)  
Failed/Halted CPU  
Faulty Motherboard, or Relay Board  
Faulty Connectors/Wiring to/from Relay Board  
Failed/Faulty +5 VDC Power Supply (PS1)  
I2C bus Health  
(Watchdog  
Circuit)  
Continuously ON  
or  
Continuously OFF  
D1  
(Red)  
DC VOLTAGE TEST  
POINTS  
STATUS LED’s  
RELAY PCA  
Figure 10-5:  
Relay Board Status LEDs  
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Table 10-5: Relay Board Status LED Failure Indications  
SIGNAL I/O PARAMETER  
LED  
FUNCTION  
DIAGNOSTIC TECHNIQUE  
ACTIVATED BY  
VIEW RESULT  
Voltage displayed should change. If not:  
Failed Heater  
WHEEL_TEMP Faulty Temperature Sensor  
Failed AC Relay  
D2  
Yellow  
WHEEL  
HEATER  
WHEEL_HEATER  
Faulty Connectors/Wiring  
Voltage displayed should change. If not:  
Failed Heater  
BENCH_TEMP Faulty Temperature Sensor  
Failed AC Relay  
D3  
Yellow  
BENCH  
HEATER  
BENCH_HEATER  
N/A  
Faulty Connectors/Wiring  
D4  
Yellow  
SPARE  
N/A  
N/A  
Sample/Cal Valve should audibly change states. If  
not:  
SAMPLE/CAL  
GAS VALVE  
OPTION  
Failed Valve  
Failed Relay Drive IC on Relay Board  
Failed Relay Board  
D5  
Green  
CAL_VALVE  
N/A  
Faulty +12 VDC Supply (PS2)  
Faulty Connectors/Wiring  
Zero/Span Valve should audibly change states. If  
not:  
ZERO/SPAN  
GAS VALVE  
OPTION  
Failed Valve  
Failed Relay Drive IC on Relay Board  
Failed Relay Board  
Faulty +12 VDC Supply (PS2)  
Faulty Connectors/Wiring  
Shutoff Valve should audibly change states. If not:  
Failed Valve  
Failed Relay Drive IC on Relay Board  
Failed Relay Board  
Faulty +12 VDC Supply (PS2)  
Faulty Connectors/Wiring  
Voltage displayed should change. If not:  
Failed IR Source  
D6  
Green  
SPAN_VALVE  
SHUTOFF_VALVE  
IR_SOURCE  
N/A  
N/A  
D7  
Green  
SHUTOFF  
VALVE OPTION  
Faulty +12 VDC Supply (PS2)  
D8  
Green  
IR SOURCE  
CO2_MEASURE Failed Relay Board  
Failed IR Photo-Detector  
Failed Sync/Demod Board  
Faulty Connectors/Wiring  
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10.2. Gas Flow Problems  
The GFC 7000TA has two main gas flow path, the sample gas flow path and the GFC purge gas flow  
path. Both are controlled by a critical flow orifice. Only the sample gas path is measured and reported.  
When the IZS or zero/span valve options are installed, there are several subsidiary paths but none of  
those are displayed on the front panel or stored by the DAS.  
With the O2 sensor option installed, third gas flow controlled with a critical flow orifice is added, but this  
flow is not measured or reported.  
In general, flow problems can be divided into three categories:  
Flow is too high  
Flow is greater than zero, but is too low, and/or unstable  
Flow is zero (no flow)  
When troubleshooting flow problems, it is crucial to confirm the actual flow rate without relying on the  
analyzer’s flow display. The use of an independent, external flow meter to perform a flow check as  
described in Section 9.3.4 is essential. If this test shows the flow to be correct, check the pressure  
sensors as described in Section 11.5.6.5.  
The flow diagrams provided in this manual depicting the GFC 7000TA in its standard configuration and  
with options installed can help in trouble-shooting flow problems. For your convenience they are  
collected here.  
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10.2.1. GFC 7000TA Internal Gas Flow Diagrams  
Figure 10-6:  
GFC 7000TA – Basic Internal Gas Flow  
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SAMPLE GAS  
INLET  
Shutoff  
Valve  
Sample / Cal  
Valve  
PRESSURE  
SPAN INLET  
VENT SPAN  
OUTLET  
Zero / Span  
Valve  
IZS INLET  
EXHAUST  
GAS OUTLET  
PUMP  
SAMPLE  
PRESSURE  
SENSOR  
Sample Gas  
Flow Control  
Flow / Pressure  
Sensor PCA  
CO2 FLOW  
SENSOR  
PURGE GAS  
INLET  
Purge Gas  
Pressure Control  
Figure 10-7:  
Internal Pneumatic Flow – Ambient Zero/Pressurized Span Valves  
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SAMPLE GAS  
INLET  
Sample / Cal  
Valve  
PRESSURE  
SPAN INLET  
VENT SPAN  
OUTLET  
Zero / Span  
Valve  
IZS INLET  
EXHAUST  
GAS OUTLET  
PUMP  
SAMPLE  
PRESSURE  
SENSOR  
Sample Gas  
Flow Control  
Flow / Pressure  
Sensor PCA  
NO2 FLOW  
SENSOR  
PURGE GAS  
INLET  
Purge Gas  
Pressure Control  
Figure 10-8:  
Internal Pneumatic Flow – Ambient Zero/Ambient Span  
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Figure 10-9:  
GFC 7000TA – Internal Pneumatics with O2 Sensor Option 65A  
10.2.2. Typical Sample Gas Flow Problems  
10.2.2.1. Flow is Zero  
The unit displays a SAMPLE FLOW warning message on the front panel display or the SAMPLE FLOW  
test function reports a zero or very low flow rate.  
Confirm that the sample pump is operating (turning). If not, use an AC voltmeter to make sure that power  
is being supplied to the pump. If no power is present at the electrical leads of the pump.  
1. If AC power is being supplied to the pump, but it is not turning, replace the pump.  
2. If the pump is operating but the unit reports no gas flow, perform a flow check as described in  
Section 9.3.4.  
3. If no independent flow meter is available:  
Disconnect the gas lines from both the sample inlet and the exhaust outlet on the rear panel  
of the instrument.  
Make sure that the unit is in basic SAMPLE Mode.  
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Place a finger over an Exhaust outlet on the rear panel of the instrument.  
If gas is flowing through the analyzer, you will feel pulses of air being expelled from the  
Exhaust outlet.  
4. If gas flows through the instrument when it is disconnected from its sources of zero air, span gas  
or sample gas, the flow problem is most likely not internal to the analyzer. Check to make sure  
that:  
All calibrators/generators are turned on and working correctly.  
Gas bottles are not empty or low.  
Valves, regulators and gas lines are not clogged or dirty.  
10.2.2.2. Low Flow  
1. Check if the pump diaphragm is in good condition. If not, rebuild the pump (See Section 9.3.2).  
Check the Spare Parts List for information of pump rebuild kits.  
2. Check for leaks as described in Section 9.3.3. Repair the leaking fitting, line or valve and re-  
check.  
3. Check for the sample filter and the orifice filter for dirt. Replace filters (See Sections 9.3.1 and  
11.5.1 respectively).  
4. Check for partially plugged pneumatic lines, orifices, or valves. Clean or replace them.  
5. If an IZS option is installed in the instrument, press CALZ and CALS. If the flow increases then  
suspect a bad sample/cal valve.  
10.2.2.3. High Flow  
The most common cause of high flow is a leak in the sample flow control assembly or between there and  
the pump. If no leaks or loose connections are found in the fittings or the gas line between the orifice and  
the pump, rebuild/clean the sample flow control assembly as described in Section 11.6.1.  
10.2.2.4. Displayed Flow = “XXXX”  
This warning means that there is inadequate gas flow. There are four conditions that might cause this:  
1. A leak upstream or downstream of the flow sensor  
2. A flow obstruction upstream or downstream of the flow sensor  
3. Bad Flow Sensor Board  
4. Bad pump  
To determine which case it is, view the sample pressure and sample flow functions via the front panel. If  
the sample pressure is reading abnormally low, then the cause is likely a flow obstruction upstream of the  
flow sensor. First, check the sample filter and make sure it is not plugged and then systematically check  
all the other components upstream of the orifice to ensure that they are not obstructed.  
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If the sample pressure is reading normal but the sample flow is reading low then it is likely that the pump  
diaphragm is worn or there is an obstruction downstream of the flow sensor.  
10.2.2.5. Actual Flow Does Not Match Displayed Flow  
If the actual flow measured does not match the displayed flow, but is within the limits of 720-880 cc/min,  
adjust the calibration of the flow measurement as described in Section 6.9.8.  
10.2.2.6. Sample Pump  
The sample pump should start immediately after the front panel power switch is turned ON. With the  
Sample Inlet plugged, the test function PRES should read about 10”-Hg for a pump in good condition.  
Readings above 10” Hg indicate that the pump needs rebuilding. If the test function SAMP FL is greater  
than 10 cm3/min there is a leak in the pneumatic lines.  
10.2.3. Poor or Stopped Flow of Purge Gas  
If sufficient purge gas is not supplied to the GFC wheel housing, cyclical fluctuations in readings at zero  
or low CO2 concentrations, such as < 100 ppm, may occur. These fluctuations are the result of changes  
in the CO2 concentration of the ambient atmosphere throughout the course of the day and night. In  
isolated areas with relatively few people working nearby the ambient CO2 concentration will fall during the  
day and rise during the night as rate of photosynthesis of the plants in the surrounding area decreases  
and increases. In a lab environment with a relatively high human occupancy the ambient CO2  
concentration will increase during those parts of the day when the highest number of workers are present.  
If the GFC wheel housing is allowed to fill with ambient air, these natural, diurnal fluctuations might be  
detected by the instrument and cause it’s in its calculation of the CO2 concentration of the sample gas to  
drift.  
Another possible symptom of poor or stopped purge gas flow would be the inability to measure zero  
concentrations accurately at the end of a work day on a system that was calibrated at the beginning of a  
workday. Although this could also be due to local fluctuations in ambient CO2 concentration during the  
day.  
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10.3. Calibration Problems  
10.3.1. Miscalibrated  
There are several symptoms that can be caused by the analyzer being miss-calibrated. This condition is  
indicated by out of range Slopes and Offsets as displayed through the test functions and is frequently  
caused by the following:  
1. BAD SPAN GAS. This can cause a large error in the slope and a small error in the offset.  
Delivered from the factory, the GFC 7000TA’s slope is within ±15% of nominal. Bad span gas will  
cause the analyzer to be calibrated to the wrong value. If in doubt have the span gas checked by  
and independent lab.  
2. CONTAMINATED ZERO GAS. Excess H2O can cause a positive or negative offset and will  
indirectly affect the slope.  
3. Dilution calibrator not set up correctly or is malfunctioning. This will also cause the slope, but not  
the zero, to be incorrect. Again the analyzer is being calibrated to the wrong value.  
4. Too many analyzers on the manifold. This can cause either a slope or offset error because  
ambient gas with its pollutants will dilute the zero or span gas.  
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10.3.2. Non-Repeatable Zero and Span  
As stated earlier, leaks both in the GFC 7000TA and in the external system are a common source of  
unstable and non-repeatable readings.  
1. Check for leaks in the pneumatic systems as described in Section 9.3.3. Don’t forget to consider  
pneumatic components in the gas delivery system outside the GFC 7000TA. Such as:  
A change in zero air source such as ambient air leaking into zero air line, or;  
A change in the span gas concentration due to zero air or ambient air leaking into the span  
gas line.  
2. Once the instrument passes a leak check, do a flow check (See Section 9.3.4) to make sure  
adequate sample is being delivered to the sensor assembly.  
3. A failing IR photo-detector may be at fault. Check the CO2 MEAS and CO2 REF test functions  
via the front panel display to make sure the signal levels are in the normal range (See Appendix  
A) and are quiet.  
4. Confirm the sample pressure, wheel temperature, bench temperature, and sample flow readings  
are correct and have steady readings.  
5. Disconnect the exhaust line from the optical bench near the rear of the instrument and plug this  
line into the SAMPLE inlet creating a pneumatic loop. The CO2 concentration (either zero or  
span) now must be constant. If readings become quiet, the problem is in the external pneumatics  
supplies for sample gas, span gas or zero air.  
6. If pressurized span gas is being used with a zero/span valve option, make sure that the venting is  
adequate (See Section 3.1.2 and 5.4)  
7. If it is the zero point that is non-repeatable, and if that non-repeatability seems to only occur at a  
certain time of day, such as when worker occupancy is highest or lowest, make sure the flow of  
purge gas to the GFC wheel housing has not stopped (See Sections 10.2.2 and 11.1.7 for more  
information).  
10.3.3. Inability to Span – Touchscreen SPAN Button Not Visible  
1. Confirm that the carbon dioxide span gas source is accurate; this can be done by switching  
between two span-gas tanks. If the CO2 concentration is different, there is a problem with one of  
the tanks.  
2. Check for leaks in the pneumatic systems as described in Section 9.3.3.  
3. Make sure that the expected span gas concentration entered into the instrument during  
calibration is the correct span gas concentration and not too different from expected span value.  
This can be viewed via the RNG Menu (See Section 6.7).  
4. Check to make sure that there is no ambient air or zero air leaking into span gas line.  
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10.3.4. Inability to Zero – Touchscreen ZERO Button Not Visible  
1. Confirm that there is a good source of zero air. Dilute a tank of span gas with the same amount  
of zero air from two different sources. If the CO2 Concentration of the two measurements is  
different, there is a problem with one of the sources of zero air.  
2. Check for leaks in the pneumatic systems as described in Section 9.3.3.  
3. If the analyzer has had zero/span valve options 52 or 53, the CO2 scrubber may need  
maintenance.  
4. Check to make sure that there is no ambient air leaking into zero air line.  
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10.4. Other Performance Problems  
Dynamic problems (i.e. problems which only manifest themselves when the analyzer is monitoring  
sample gas) can be the most difficult and time consuming to isolate and resolve. The following provides  
an itemized list of the most common dynamic problems with recommended troubleshooting checks and  
corrective actions.  
10.4.1. Temperature Problems  
Individual control loops are used to maintain the set point of the absorption bench, filter wheel, and IR  
photo-detector temperatures. If any of these temperatures are out of range or are poorly controlled, the  
GFC 7000TA will perform poorly.  
10.4.1.1. Box or Sample Temperature  
Box Temperature  
The box temperature sensor is mounted to the motherboard and cannot be disconnected to check its  
resistance. Rather check the BOX TEMP signal using the SIGNAL I/O function under the DIAG Menu  
(See Section 10.1.3). This parameter will vary with ambient temperature, but at ~30oC (6-7° above room  
temperature) the signal should be ~1450 mV.  
Sample Temperature  
The Sample Temperature should closely track the bench temperature. If it does not, locate the sensor,  
which is located at the midpoint of the optical bench in a brass fitting. Unplug the connector labeled  
“Sample”, and measure the resistance of the thermistor; at room temperature (25°C) it should be ~30K  
Ohms, at operating temperature, 48°C, it should be ~ 12K Ohms  
10.4.1.2. Bench Temperature  
There are three possible failures that could cause the Bench temperature to be incorrect.  
1. The heater mounted to the bottom of the Absorption bench is electrically shorted or open. Check  
the resistance of the two heater elements by measuring between pin 2 and 4 (~76 Ohms), and  
pin 3 and 4 (~330 Ohms), of the white five-pin connector just below the sample temperature  
sensor on the Bench (pin 1 is the pointed end).  
2. Assuming that the I2C bus is working and that there is no other failure with the relay board, the  
solid-state relay (K2) on the relay board may have failed. Using the BENCH_HEATER parameter  
under the signal I/O function, as described above, turn on and off K2 (D3 on the relay board  
should illuminate as the heater is turned on). Check the AC voltage present between pin 2 and 4,  
for a 100 or 115 VAC model, and pins 3 and 4, for a 220-240 VAC model.  
WARNING:  
HAZARDOUS VOLTAGES ARE PRESENT DURING THIS TEST  
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3. If the relay has failed there should be no change in the voltage across pins 2 and 4 or 3 and 4.  
NOTE: K2 is in a socket for easy replacement.  
4. If K2 checks out OK, the thermistor temperature sensor located on the optical bench near the  
front of the instrument could be at fault. Unplug the connector labeled “Bench”, and measure the  
resistance of the thermistor. At room temperature it should have approximately 30K Ohms  
resistance near the 48oC set point it should have ~12K ohms.  
10.4.1.3. GFC Wheel Temperature  
Like the bench heater above there are three possible causes for the GFC wheel temperature to have  
failed.  
1. The wheel heater has failed. Check the resistance between pins 1 and 4 on the white five-pin  
connector just below the sample temperature sensor on the bench (pin 1 is the pointed end). It  
should be approximately 275 ohms.  
2. Assuming that the I2C bus is working and that there is no other failure with the relay board, the  
solid-state relay (K1) on the relay board may have failed. Using the WHEEL_HEATER  
parameter under the signal I/O function, as described above, turn on and off K1 (D2 on the relay  
board should illuminate as the heater is turned on). Check the AC voltage present between Pin 1  
and Pin 4.  
WARNING:  
HAZARDOUS VOLTAGES ARE PRESENT DURING THIS TEST  
3. If the relay has failed there should be no change in the voltage across pins 1 and 4. NOTE: K1 is  
socketed for easy replacement.  
4. If K1 checks out OK, the thermistor temperature sensor located at the front of the filter wheel  
assembly may have failed. Unplug the connector labeled “Wheel”, and measure the resistance of  
the thermistor. The resistance near the 68oC set point is ~5.7k ohms.  
10.4.1.4. IR Photo-Detector TEC Temperature  
If the PHT DRIVE test parameter described above in Table 11-2 is out of range there are two four  
possible causes of failure.  
1. The screws retaining the IR photo detector to the absorption bench have become loose.  
Carefully tighten the screws, hand-tight and note whether, after the analyzer has come up to  
operating temperature, whether the PHT DRIVE voltage has returned to an acceptable level.  
2. The two large transistor-type devices mounted to the side of the Absorption Bench have come  
loose from the bench. Tighten the retaining screws and note whether there is an improvement in  
the PHT DRIVE voltage.  
3. The photo-detector has failed. Contact the factory for instructions.  
4. The sync demodulator circuit board has failed. Contact the factor for instructions.  
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10.4.2. Excessive Noise  
Noise is continuously monitored in the TEST functions as the STABIL reading and only becomes  
meaningful after sampling a constant gas concentration for at least 10 minutes. Compare the current  
STABIL reading with that recorded at the time of manufacture (included in the GFC 7000TA Final Test  
and Validation Data Sheet-p/n 04271 shipped with the unit from Teledyne Instruments).  
1. The most common cause of excessive noise is leaks. Leak check and flow check the instrument  
described in Section 9.3.  
2. Detector failure – caused by failure of the hermetic seal or over-temperature due to poor heat  
sinking of the detector can to the optical bench. In addition to increased noise due to poor signal-  
to-noise ratio, another indicator of detector failure is a drop in the signal levels of the CO2  
MEASURE signal and CO2 REFERENCE signal.  
3. Sync/Demod Board failure. There are many delicate, high impedance parts on this board. Check  
the CO2 MEAS and CO2 REF Test Functions via the Front Panel Display.  
4. The detector cooler control circuit can fail for reasons similar to the detector itself failing.  
Symptoms would be a change in MR RATIO Test Function when zero air is being sampled.  
Also check the SIGNAL I/O parameter PHT DRIVE. After warm-up, and at 25oC ambient, if PHT  
DRIVE < 4800 mV, the cooler is working properly. If PHT DRIVE is > 4800 mV there is a  
malfunction.  
5. The +5 and 15 VDC voltages in the GFC 7000TA are provided by switching power supplies.  
Switch mode supplies create DC outputs by switching the input AC waveform at high frequencies.  
As the components in the switcher age and degrade, the main problem observed is increased  
noise on the DC outputs. If a noisy switcher power supply is suspected, attach an oscilloscope to  
the DC output test points located on the top right hand edge of the Relay board. Look for short  
period spikes > 100 mV p-p on the DC output.  
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10.5. Subsystem Checkout  
The preceding s of this manual discussed a variety of methods for identifying possible sources of failures  
or performance problems within the analyzer. In most cases this included a list of possible causes. This  
describes how to determine individually determine if a certain component or subsystem is actually the  
cause of the problem being investigated.  
10.5.1. AC Mains Configuration  
The analyzer is correctly configured for the AC mains voltage in use if:  
1. The Sample Pump is running.  
2. The GFC wheel motor is spinning. LED’s D1 & D2 (located on the synch/demod PCA) should be  
flashing.  
3. If incorrect power is suspected, check that the correct voltage and frequency is present at the line  
input on the rear panel.  
If the unit is set for 230 VAC and is plugged into 115VAC, or 100VAC the sample pump  
will not start, and the heaters will not come up to temperature.  
If the unit is set for 115 or 100 VAC and is plugged into a 230 VAC circuit, the circuit  
breaker built into the ON/OFF Switch on the Front Panel will trip to the OFF position  
immediately after power is switched on.  
10.5.2. DC Power Supply  
If you have determined that the analyzer’s AC mains power is working, but the unit is still not operating  
properly, there may be a problem with one of the instrument’s switching power supplies. The supplies  
can have two faults, namely no DC output, and noisy output.  
To assist tracing DC Power Supply problems, the wiring used to connect the various printed circuit  
assemblies and DC Powered components and the associated test points on the relay board follow a  
standard color-coding scheme as defined in the following table.  
Table 10-6: DC Power Test Point and Wiring Color Codes  
NAME  
Dgnd  
+5V  
TEST POINT#  
TP AND WIRE COLOR  
1
2
3
4
5
6
7
Black  
Red  
Agnd  
+15V  
-15V  
Green  
Blue  
Yellow  
Purple  
Orange  
+12R  
+12V  
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A voltmeter should be used to verify that the DC voltages are correct per the values in the table below,  
and an oscilloscope, in AC mode, with band limiting turned on, can be used to evaluate if the supplies are  
producing excessive noise (> 100 mV p-p).  
Table 10-7: DC Power Supply Acceptable Levels  
CHECK RELAY BOARD TEST POINTS  
POWER  
SUPPLY  
ASSY  
VOLTAG  
FROM TEST POINT  
TO TEST POINT  
MIN V  
MAX V  
E
NAME  
Dgnd  
#
1
3
3
3
1
6
6
NAME  
+5  
#
2
PS1  
PS1  
PS1  
PS1  
PS1  
PS2  
PS2  
+5  
+15  
4.8  
5.25  
16V  
Agnd  
+15  
4
13.5  
-15  
Agnd  
-15V  
5
-14V  
-0.05  
-0.05  
11.75  
-0.05  
-16V  
0.05  
0.05  
12.5  
0.05  
Agnd  
Chassis  
+12  
Agnd  
Dgnd  
Chassis  
+12V  
Dgnd  
1
Dgnd  
N/A  
7
+12V Ret  
+12V Ret  
Dgnd  
1
10.5.3. I2C Bus  
Operation of the I2C bus can be verified by observing the behavior of D1 on the Relay PCA & D2 on the  
Valve Driver PCA . Assuming that the DC power supplies are operating properly, the I2C bus is operating  
properly if: D1 on the relay PCA and D2 of the Valve Driver PCA are flashing  
There is a problem with the I2C bus if both D1 on the relay PCA and D2 of the Valve Driver PCA are  
ON/OFF constantly (steady lit or steady off)  
10.5.4. Touchscreen Interface  
Verify the functioning of the touchscreen by observing the display when pressing a touchscreen control  
button. Assuming that there are no wiring problems and that the DC power supplies are operating  
properly, if pressing a control button on the display does not change the display, any of the following may  
be the problem:  
The touchscreen controller may be malfunctioning.  
The internal USB bus may be malfunctioning.  
You can verify this failure by logging on to the instrument using APICOM or a terminal program to any of  
the communications ports. If the analyzer responds to remote commands and the display changes  
accordingly, the touchscreen interface may be faulty.  
10.5.5. LCD Display Module  
Verify the functioning of the front panel display by observing it when power is applied to the instrument.  
Assuming that there are no wiring problems and that the DC power supplies are operating properly, the  
display screen should light and show the splash screen with logo and other indications of its state as the  
CPU goes through its initialization process.  
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10.5.6. Relay Board  
The relay board PCA (04135) can be most easily checked by observing the condition of the its status  
LEDs on the relay board, as described in Section 10.1.4.3, and the associated output when toggled on  
and off through signal I/O function in the diagnostic menu, See Section 10.1.3.  
1. If the front panel display responds to button presses and D1 on the relay board is not flashing,  
then either the I2C connection between the motherboard and the relay board is bad, or the relay  
board itself is bad.  
2. If D1 on the relay board is flashing and the status indicator for the output in question (heater  
power, valve drive, etc.) toggles properly using the signal I/O function, then the associated control  
device on the relay board is bad. Several of the control devices are in sockets and can be easily  
replaced. The table below lists the control device associated with a particular function:  
Table 10-8: Relay Board Control Devices  
CONTROL  
DEVICE  
K1  
FUNCTION  
IN SOCKET  
Wheel Heater  
Bench Heater  
Spare AC Control  
IZS Valves  
Yes  
Yes  
Yes  
Yes  
No  
K2  
K3  
U4  
IR Source Drive  
U5  
The IR source drive output can be verified by measuring the voltage at J16 with the IR source  
disconnected. It should be 11.5± 0.5 VDC.  
10.5.7. Sensor Assembly  
10.5.7.1. Sync/Demodulator Assembly  
To verify that the Sync/Demodulator Assembly is working follow the procedure below:  
1. Verify that D1 and D2 are flashing (they flash at different rates, see Table 11-3).  
If not check the opto pickup assembly, Section 10.5.7.2 and the GFC wheel drive, Section  
11.5.6.3.  
If the wheel drive and opto pickup are working properly then verify that there is 2.4 ±0.1 VAC  
and 2.5 ±0.15 VDC between digital ground and TP 5 on the sync demod board. If not then  
check the wiring between the sync/demod and opto pickup assembly (see interconnect  
drawing 04216). If good then the sync/demod board is bad.  
2. Verify that the IR source is operating, Section 10.5.7.4.  
3. With the analyzer connected to zero air, measure between TP11 (measure) and analog ground,  
and TP12 (reference) and analog ground.  
If they are similar to values recorded on the factory data sheet then there is likely a problem  
with the wiring or the A/D converter.  
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If they are not then either the sync demodulator board or the IR-photodetector are bad. See  
Section 10.4.1.4 for problems with the IR-photodetector TEC drive.  
10.5.7.2. Opto Pickup Assembly  
Operation of the opto pickup PCA (04088) can be verified with a voltmeter. Measure the AC and DC  
voltage between digital ground on the relay board, or touchscreen and TP1 and TP2 on the sync pickup  
PCA. For a working board, with the GFC motor spinning, they should read 2.4 ±0.1 VAC and 2.5 ±0.15  
VDC.  
Further confirmation that the pickups and motor are operating properly can be obtained by measuring the  
frequency at TP1 and TP2 using a frequency counter, a digital volt meter with a frequency counter, or an  
oscilloscope per the table below.  
Table 10-9: Opto Pickup Board Nominal Output Frequencies  
NOMINAL MEASURED FREQUENCY  
AC MAINS FREQ.  
50 Hz  
TP1  
25  
TP2  
300  
360  
60 Hz  
30  
10.5.7.3. GFC Wheel Drive  
If the D1 and D2 on the sync demodulator board are not flashing then:  
1. Check for power to the motor by measuring between pins 1 and 3 on the connector feeding the  
motor. For instruments configured for 120 or 220-240VAC there should be approximately 88  
VAC for instruments configured for 100VAC, it should be the voltage of the AC mains,  
approximately 100VAC.  
2. Verify that the frequency select jumper, JP4, is properly set on the Relay Board. For 50 Hz  
operation it should be installed. For 60 Hz operation may either be missing or installed in a  
vertical orientation.  
3. If there is power to the motor and the frequency select jumper is properly set then the motor is  
likely bad. See Section 10.6.2 for instructions on removing and replacing the GFC assembly that  
the motor is bolted to.  
10.5.7.4. IR Source  
The IR source can be checked using the following procedure:  
1. Disconnect the source and check its resistance when cold. When new, the source should have a  
cold resistance of more than 1.5 Ohms but less than 3.5 Ohms. If not, then the source is bad.  
2. With the source disconnected, energize the analyzer and wait for it to start operating. Measure  
the drive Voltage between pins 1 and 2 on the jack that the source is normally connected to; it  
should be 11.5 ± 0.25 VDC. If not, then there is a problem with either the wiring, the Relay  
Board, or the +12V power supply.  
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3. If the drive voltage is correct in step 2, then remove the source from the heat sink assembly (2  
screws on top) and connect to its mating connector. Observe the light being emitted from the  
source. It should be centered at the bottom of the U-shaped element. If there is either no  
emission or a badly centered emission then the source is bad.  
10.5.7.5. Pressure/Flow Sensor Assembly  
The pressure/flow sensor PCA, located on the top of the absorption bench, can be checked with a  
Voltmeter using the following procedure which, assumes that the wiring is intact, and that the  
motherboard and the power supplies are operating properly:  
1. For Pressure related problems:  
Measure the voltage across C1 it should be 5 ± 0.25 VDC. If not then the board is bad.  
Measure the voltage across TP4 and TP1. With the sample pump disabled it should be 4500  
mV ±250 mV. With the pump energized it should be approximately 200 mV less. If not, then  
S1, the pressure transducer is bad, the board is bad, or there is a pneumatic failure  
preventing the pressure transducer from sensing the absorption cell pressure properly.  
For flow related problems:  
Measure the voltage across TP2 and TP1 it should be 10 ±0.25 VDC. If not then the board is  
bad.  
Measure the voltage across TP3 and TP1. With proper flow (800 cc/min at the sample inlet)  
this should be approximately 4.5V (this voltage will vary with altitude). With flow stopped  
(sample inlet blocked) the voltage should be approximately 1V. If the voltage is incorrect, the  
flow sensor is bad, the board is bad or there is a leak upstream of the sensor.  
10.5.8. Motherboard  
10.5.8.1. A/D Functions  
The simplest method to check the operation of the A-to-D converter on the motherboard is to use the  
Signal I/O function under the DIAG menu to check the two A/D reference voltages and input signals that  
can be easily measured with a voltmeter.  
1. Use the Signal I/O function (See Section 10.1.3 and Appendix A) to view the value of  
REF_4096_MV and REF_GND. If both are within 3 mV of nominal (4096 and 0), and are stable,  
±0.5 mV then the basic A/D is functioning properly. If not then the motherboard is bad.  
2. Choose a parameter in the Signal I/O function such as SAMPLE_PRESSURE, SAMPLE_FLOW,  
CO2_MEASURE or CO2_REFERENCE. Compare these voltages at their origin (see interconnect  
drawing 04215 and interconnect list 04216) with the voltage displayed through the signal I/O  
function. If the wiring is intact but there is a large difference between the measured and  
displayed voltage (±10 mV) then the motherboard is bad.  
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10.5.8.2. Analog Outputs: Voltage  
To verify that the analog outputs are working properly, connect a voltmeter to the output in question and  
perform an analog output step test as described in Section 6.9.3.  
For each of the steps, taking into account any offset that may have been programmed into channel (See  
Section 6.9.4), the output should be within 1% of the nominal value listed in the table below except for the  
0% step, which should be within 2 to 3 mV. If one or more of the steps fails to be within this range then it  
is likely that there has been a failure of the either or both of the DACs and their associated circuitry on the  
motherboard.  
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Table 10-10: Analog Output Test Function - Nominal Values Voltage Outputs  
FULL SCALE OUTPUT VOLTAGE  
100MV  
1V  
5V  
10V  
STEP  
%
0
NOMINAL OUTPUT VOLTAGE  
1
2
3
4
5
6
0
0
0
1
2
3
4
5
0
2
20  
40  
60  
80  
100  
20 mV  
40 mV  
60 mV  
80 mV  
100 mV  
0.2  
0.4  
0.6  
0.8  
1.0  
4
6
8
10  
10.5.8.3. Analog Outputs: Current Loop  
To verify that the analog outputs with the optional current mode output are working properly, connect a  
250 ohm resistor across the outputs and use a voltmeter to measure the output as described in Section  
6.9.4.2 and then perform an analog output step test as described in Section 6.9.3.  
For each step the output should be within 1% of the nominal value listed in the table below.  
Table 10-11: Analog Output Test Function - Nominal Values Current Outputs  
OUTPUT RANGE  
2 -20  
4 -20  
NOMINAL OUTPUT VALUES  
STEP  
%
0
CURRENT  
2 mA  
5.6  
V(250 OHMS)  
CURRENT  
V(250 OHMS)  
1
2
3
4
5
6
0.5V  
1.4  
2.3  
3.2  
4.1  
5
4
1
20  
40  
60  
80  
100  
7.2  
1.8  
2.6  
3.4  
4.2  
5
9.2  
10.4  
13.6  
16.8  
20  
12.8  
16.4  
20  
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10.5.8.4. Status Outputs  
The procedure below can be used to test the Status outputs:  
1. Connect a jumper between the “D“ pin and the “” pin on the status output connector.  
2. Connect a 1000 ohm resistor between the “+” pin and the pin for the status output that is being  
tested.  
3. Connect a voltmeter between the “” pin and the pin of the output being tested (see table below).  
Under the DIAGSIGNAL I/O menu (See Section 10.1.3), scroll through the inputs and outputs until you  
get to the output in question. Alternately turn on and off the output noting the voltage on the voltmeter, it  
should vary between 0 volts for ON and 5 volts for OFF.  
Table 10-12: Status Outputs Check  
PIN (LEFT TO RIGHT)  
STATUS  
SYSTEM OK  
CONC VALID  
HIGH RANGE  
ZERO CAL  
SPAN CAL  
DIAG MODE  
ALRM1  
1
2
3
4
5
6
7
8
ALRM2  
10.5.8.5. Control Inputs – Remote Zero, Span  
The control input bits can be tested by the following procedure:  
1. Connect a jumper from the +5 pin on the Status connector to the x5V on the Control In connector.  
2. Connect a second jumper from the ‘-‘ pin on the Status connector to the A pin on the Control In  
connector. The instrument should switch from SAMPLE mode to ZERO CAL R mode.  
3. Connect a second jumper from the ‘-‘ pin on the Status connector to the B pin on the Control In  
connector. The instrument should switch from SAMPLE mode to SPAN CAL R mode.  
4. In each case, the GFC 7000TA should return to SAMPLE mode when the jumper is removed.  
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10.5.9. CPU  
There are two major types of failures associated with the CPU board: complete failure and a failure  
associated with the Disk on Module (DOM). If either of these failures occur, contact the factory.  
For complete failures, assuming that the power supplies are operating properly and the wiring is intact,  
the CPU is faulty if on power-on, the watchdog LED on the motherboard is not flashing.  
In some rare circumstances, this failure may be caused by a bad IC on the motherboard, specifically U57,  
the large, 44-pin device on the lower right hand side of the board. If this is true, removing U57 from its  
socket will allow the instrument to start up but the measurements will be invalid.  
If the analyzer stops during initialization (the front panel display shows a fault or warning message), it is  
likely that the DOM, the firmware or the configuration and data files have been corrupted.  
10.5.10. RS-232 Communications  
10.5.10.1. General RS-232 Troubleshooting  
Teledyne Instruments analyzers use the RS-232 communications protocol to allow the instrument to be  
connected to a variety of computer-based equipment. RS-232 has been used for many years and as  
equipment has become more advanced, connections between various types of hardware have become  
increasingly difficult. Generally, every manufacturer observes the signal and timing requirements of the  
protocol very carefully.  
Problems with RS-232 connections usually center around 4 general areas:  
1. Incorrect cabling and connectors. See Section 6.11.2 for connector and pin-out information.  
2. The BAUD rate and protocol are incorrectly configured. See Section 6.10.7.  
3. If a modem is being used, additional configuration and wiring rules must be observed. See  
Section 6.13.2.6  
4. Incorrect setting of the DTE – DCE Switch is set correctly. See Section 6.10.5  
5. Verify that cable (03596) that connects the serial COM ports of the CPU to J12 of the  
motherboard is properly seated  
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10.5.10.2. Troubleshooting Analyzer/Modem or Terminal Operation  
These are the general steps for troubleshooting problems with a modem connected to a Teledyne  
Instruments analyzer.  
1. Check cables for proper connection to the modem, terminal or computer.  
2. Check to make sure the DTE-DCE is in the correct position as described in Section 6.10.5.  
3. Check to make sure the set up command is correct (See Section 6.13.2.7)  
4. Verify that the Ready to Send (RTS) signal is at logic high. The GFC 7000TA sets pin 7 (RTS) to  
greater than 3 volts to enable modem transmission.  
5. Make sure the BAUD rate, word length, and stop bit settings between modem and analyzer  
match, See Section 6.10.7.  
6. Use the RS-232 test function to send “w” characters to the modem, terminal or computer; See  
Section 6.10.8.  
7. Get your terminal, modem or computer to transmit data to the analyzer (holding down the space  
bar is one way); the green LED should flicker as the instrument is receiving data.  
8. Make sure that the communications software or terminal emulation software is functioning  
properly.  
Further help with serial communications is available in a separate manual “RS-232 Programming Notes”  
Teledyne Instruments part number 013500000.  
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10.6. Repair Procedures  
This contains procedures that might need to be performed on rare occasions when a major component of  
the analyzer requires repair or replacement.  
10.6.1. Repairing Sample Flow Control Assembly  
The critical flow orifice is housed in the flow control assembly (Teledyne Instruments part number:  
001760400) located on the top of the optical bench. A sintered filter protects the jewel orifice so it is  
unusual for the orifice to need replacing, but if it does, or the filter needs replacement please use the  
following procedure (see the Spare Parts list in Appendix B for part numbers and kits):  
1. Turn off power to the analyzer.  
2. Locate the assembly attached to the sample pump, see Figure 3–3.  
3. Disconnect the pneumatic connection from the flow assembly and the assembly from the pump.  
4. Remove the fitting and the components as shown in the exploded view in Figure 11.6.  
5. Replace the o-rings (p/n OR000001) and the sintered filter (p/n FL000001).  
6. If replacing the critical flow orifice itself (P/N 00094100), make sure that the side with the colored  
window (usually red) is facing upstream to the flow gas flow.  
7. Apply new Teflon® tape to the male connector threads  
8. Re-assemble in reverse order.  
9. After reconnecting the power and pneumatic lines, flow check the instrument as described in  
Section 9.3.4.  
Pneumatic Connector, Male 1/8”  
(P/N FT_70  
Spring  
(P/N HW_20)  
Sintered Filter  
(P/N FL_01)  
Critical Flow Orifice  
(P/N 00094100)  
Make sure it is placed with the  
jewel down)  
O-Ring  
(P/N OR_01)  
Purge Housing  
(P/N 000850000)  
Figure 10-10: Critical Flow Restrictor Assembly Disassembly  
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10.6.2. Removing/Replacing the GFC Wheel  
When removing or replacing the GFC Wheel it is important to perform the disassembly in the following  
order to avoid damaging the components:  
1. Turn off the analyzer.  
2. Remove the top cover as described in “Getting Started” Section 3.1.  
3. Open the instrument’s hinged front panel.  
4. Locate the GFC wheel/motor assembly (see Figure 3-3).  
5. Unplug the following electronic components:  
The GFC wheel housing temperature sensor;  
GFC wheel heater  
GFC wheel motor power supply  
IR source  
6. Unscrew the purge gas line hex nut and remove the 1/8 inch FEP purge gas line.  
10  
7
8
9
Figure 10-11: Opening the GFC Wheel Housing  
7. Remove the two (2) screws holding the opto-pickup printed circuit assembly to the GFC wheel  
housing.  
8. Carefully remove the opto-pickup printed circuit assembly.  
9. Remove the four (4) screws holding the GFC wheel motor/heat sink assembly to the GFC wheel  
housing.  
10. Carefully remove the GFC wheel motor/heat sink assembly from the GFC wheel housing.  
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11. Remove the one (1) screw fastening the GFC wheel/mask assembly to the GFC motor hub.  
11  
12  
Figure 10-12: Removing the GFC Wheel  
12. Remove the GFC wheel/mask assembly.  
13. Follow the previous steps in reverse order to put the GFC wheel/motor assembly back together.  
10.6.3. Disk-On-Module Replacement Procedure  
NOTE  
Servicing of circuit components requires electrostatic discharge protection, i.e. ESD grounding straps,  
mats and containers. Failure to use ESD protection when working with electronic assemblies will void the  
instrument warranty. Refer to Section 11 for more information on preventing ESD damage.  
Replacing the Disk-on-Module (DOM) will cause loss of all DAS data; it may also cause loss of some  
instrument configuration parameters unless the replacement DOM carries the exact same firmware  
version. Whenever changing the version of installed software, the memory must be reset. Failure to  
ensure that memory is reset can cause the analyzer to malfunction, and invalidate measurements. After  
the memory is reset, the A/D converter must be re-calibrated, and all information collected in Step 1  
below must be re-entered before the instrument will function correctly. Also, zero and span calibration  
should be performed.  
1. Document all analyzer parameters that may have been changed, such as range, auto-cal,  
analog output, serial port and other settings before replacing the DOM.  
2. Turn off power to the instrument, fold down the rear panel by loosening the mounting screws.  
3. When looking at the electronic circuits from the back of the analyzer, locate the Disk-on-Module  
in the right-most socket of the CPU board.  
4. The DOM should carry a label with firmware revision, date and initials of the programmer.  
5. Remove the nylon standoff clip that mounts the DOM over the CPU board, and lift the DOM off  
the CPU. Do not bend the connector pins.  
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6. Install the new Disk-on-Module, making sure the notch at the end of the chip matches the notch  
in the socket.  
7. It may be necessary to straighten the pins somewhat to fit them into the socket. Press the chip  
all the way in.  
8. Close the rear panel and turn on power to the machine.  
9. If the replacement DOM carries a firmware revision, re-enter all of the setup information.  
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11. A PRIMER ON ELECTRO-STATIC DISCHARGE  
Teledyne Instruments considers the prevention of damage caused by the discharge of static electricity to  
be extremely important part of making sure that your analyzer continues to provide reliable service for a  
long time. This section describes how static electricity occurs, why it is so dangerous to electronic  
components and assemblies as well as how to prevent that damage from occurring.  
11.1. How Static Charges are Created  
Modern electronic devices such as the types used in the various electronic assemblies of your analyzer,  
are very small, require very little power and operate very quickly. Unfortunately, the same characteristics  
that allow them to do these things also make them very susceptible to damage from the discharge of  
static electricity. Controlling electrostatic discharge begins with understanding how electro-static charges  
occur in the first place.  
Static electricity is the result of something called triboelectric charging which happens whenever the  
atoms of the surface layers of two materials rub against each other. As the atoms of the two surfaces  
move together and separate, some electrons from one surface are retained by the other.  
Materials  
Makes  
Contact  
Materials  
Separate  
+
+
+
+
PROTONS = 3  
ELECTRONS = 2  
PROTONS = 3  
ELECTRONS = 4  
PROTONS = 3  
ELECTRONS = 3  
PROTONS = 3  
ELECTRONS = 3  
NET CHARGE = -1  
NET CHARGE = +1  
NET CHARGE = 0  
NET CHARGE = 0  
Figure 11-1:  
Triboelectric Charging  
If one of the surfaces is a poor conductor or even a good conductor that is not grounded, the resulting  
positive or negative charge cannot bleed off and becomes trapped in place, or static. The most common  
example of triboelectric charging happens when someone wearing leather or rubber soled shoes walks  
across a nylon carpet or linoleum tiled floor. With each step, electrons change places and the resulting  
electro-static charge builds up, quickly reaching significant levels. Pushing an epoxy printed circuit board  
across a workbench, using a plastic handled screwdriver or even the constant jostling of StyrofoamTM  
pellets during shipment can also build hefty static charges  
Table 11-1: Static Generation Voltages for Typical Activities  
MEANS OF GENERATION  
Walking across nylon carpet  
Walking across vinyl tile  
Worker at bench  
65-90% RH  
1,500V  
250V  
10-25% RH  
35,000V  
12,000V  
6,000V  
100V  
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Poly bag picked up from bench  
1,200V  
1,500V  
20,000V  
18,000V  
Moving around in a chair padded  
with urethane foam  
11.2. How Electro-Static Charges Cause Damage  
Damage to components occurs when these static charges come into contact with an electronic device.  
Current flows as the charge moves along the conductive circuitry of the device and the typically very high  
voltage levels of the charge overheat the delicate traces of the integrated circuits, melting them or even  
vaporizing parts of them. When examined by microscope the damage caused by electro-static discharge  
looks a lot like tiny bomb craters littered across the landscape of the component’s circuitry.  
A quick comparison of the values in Table 12-1 with the those shown in the Table 12-2, listing device  
susceptibility levels, shows why Semiconductor Reliability News estimates that approximately 60% of  
device failures are the result of damage due to electro-static discharge.  
Table 11-2: Sensitivity of Electronic Devices to Damage by ESD  
DAMAGE SUSCEPTIBILITY VOLTAGE  
RANGE  
DEVICE  
DAMAGE BEGINS  
OCCURRING AT  
CATASTROPHIC  
DAMAGE AT  
MOSFET  
VMOS  
10  
100  
30  
1800  
100  
NMOS  
60  
GaAsFET  
EPROM  
60  
2000  
100  
100  
140  
150  
190  
200  
300  
300  
300  
500  
500  
500  
JFET  
7000  
500  
SAW  
Op-AMP  
CMOS  
2500  
3000  
2500  
3000  
7000  
500  
Schottky Diodes  
Film Resistors  
This Film Resistors  
ECL  
SCR  
1000  
2500  
Schottky TTL  
Potentially damaging electro-static discharges can occur:  
Any time a charged surface (including the human body) discharges to a device. Even simple  
contact of a finger to the leads of a sensitive device or assembly can allow enough discharge to  
cause damage. A similar discharge can occur from a charged conductive object, such as a  
metallic tool or fixture.  
When static charges accumulated on a sensitive device discharges from the device to another  
surface such as packaging materials, work surfaces, machine surfaces or other device. In some  
cases, charged device discharges can be the most destructive.  
A typical example of this is the simple act of installing an electronic assembly into the connector  
or wiring harness of the equipment in which it is to function. If the assembly is carrying a static  
charge, as it is connected to ground a discharge will occur.  
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Whenever a sensitive device is moved into the field of an existing electro-static field, a charge  
may be induced on the device in effect discharging the field onto the device. If the device is then  
momentarily grounded while within the electrostatic field or removed from the region of the  
electrostatic field and grounded somewhere else, a second discharge will occur as the charge is  
transferred from the device to ground.  
11.3. Common Myths About ESD Damage  
I didn’t feel a shock so there was no electro-static discharge: The human nervous system  
isn’t able to feel a static discharge of less than 3500 volts. Most devices are damaged by  
discharge levels much lower than that.  
I didn’t touch it so there was no electro-static discharge: Electro-static charges are fields  
whose lines of force can extend several inches or sometimes even feet away from the surface  
bearing the charge.  
It still works so there was no damage: Sometimes the damaged caused by electro-static  
discharge can completely sever a circuit trace causing the device to fail immediately. More likely,  
the trace will be only partially occluded by the damage causing degraded performance of the  
device or worse, weakening the trace. This weakened circuit may seem to function fine for a  
short time, but even the very low voltage and current levels of the device’s normal operating  
levels will eat away at the defect over time causing the device to fail well before its designed  
lifetime is reached.  
These latent failures are often the most costly since the failure of the equipment in which the  
damaged device is installed causes down time, lost data, lost productivity, as well as possible  
failure and damage to other pieces of equipment or property.  
Static Charges can’t build up on a conductive surface: There are two errors in this  
statement.  
Conductive devices can build static charges if they are not grounded. The charge will be  
equalized across the entire device, but without access to earth ground, they are still trapped and  
can still build to high enough levels to cause damage when they are discharged.  
A charge can be induced onto the conductive surface and/or discharge triggered in the presence  
of a charged field such as a large static charge clinging to the surface of a nylon jacket of  
someone walking up to a workbench.  
As long as my analyzer is properly installed, it is safe from damage caused by static  
discharges: It is true that when properly installed the chassis ground of your analyzer is tied to  
earth ground and its electronic components are prevented from building static electric charges  
themselves. This does not prevent discharges from static fields built up on other things, like you  
and your clothing, from discharging through the instrument and damaging it.  
11.4. Basic Principles of Static Control  
It is impossible to stop the creation of instantaneous static electric charges. It is not, however difficult to  
prevent those charges from building to dangerous levels or prevent damage due to electro-static  
discharge from occurring.  
11.4.1. General Rules  
Only handle or work on all electronic assemblies at a properly set up ESD station. Setting up an ESD  
safe workstation need not be complicated. A protective mat properly tied to ground and a wrist strap are  
all that is needed to create a basic anti-ESD workstation (see figure 12-2).  
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W ris t S tra p  
P ro te c tiv e M a t  
G ro u n d P o in t  
Figure 11-2:  
Basic anti-ESD Work Station  
For technicians that work in the field, special lightweight and portable anti-ESD kits are available from  
most suppliers of ESD protection gear. These include everything needed to create a temporary anti-ESD  
work area anywhere.  
Always wear an Anti-ESD wrist strap when working on the electronic assemblies of your  
analyzer. An anti-ESD wrist strap keeps the person wearing it at or near the same potential as  
other grounded objects in the work area and allows static charges to dissipate before they can  
build to dangerous levels. Anti-ESD wrist straps terminated with alligator clips are available for  
use in work areas where there is no available grounded plug.  
Also, anti-ESD wrist straps include a current limiting resistor (usually around one meg-ohm) that  
protects you should you accidentally short yourself to the instrument’s power supply.  
Simply touching a grounded piece of metal is insufficient. While this may temporarily bleed  
off static charges present at the time, once you stop touching the grounded metal new static  
charges will immediately begin to re-build. In some conditions, a charge large enough to damage  
a component can rebuild in just a few seconds.  
Always store sensitive components and assemblies in anti-ESD storage bags or bins:  
Even when you are not working on them, store all devices and assemblies in a closed anti-Static  
bag or bin. This will prevent induced charges from building up on the device or assembly and  
nearby static fields from discharging through it.  
Use metallic anti-ESD bags for storing and shipping ESD sensitive components and  
assemblies rather than pink-poly bags. The famous, “pink-poly” bags are made of a plastic  
that is impregnated with a liquid (similar to liquid laundry detergent) which very slowly sweats  
onto the surface of the plastic creating a slightly conductive layer over the surface of the bag.  
While this layer may equalizes any charges that occur across the whole bag, it does not prevent  
the build up of static charges. If laying on a conductive, grounded surface, these bags will allow  
charges to bleed away but the very charges that build up on the surface of the bag itself can be  
transferred through the bag by induction onto the circuits of your ESD sensitive device. Also, the  
liquid impregnating the plastic is eventually used up after which the bag is as useless for  
preventing damage from ESD as any ordinary plastic bag.  
Anti-Static bags made of plastic impregnated with metal (usually silvery in color) provide all of the  
charge equalizing abilities of the pink-poly bags but also, when properly sealed, create a Faraday  
cage that completely isolates the contents from discharges and the inductive transfer of static  
charges.  
Storage bins made of plastic impregnated with carbon (usually black in color) are also excellent at  
dissipating static charges and isolating their contents from field effects and discharges.  
Never use ordinary plastic adhesive tape near an ESD sensitive device or to close an anti-  
ESD bag. The act of pulling a piece of standard plastic adhesive tape, such as Scotch® tape,  
from its roll will generate a static charge of several thousand or even tens of thousands of volts on  
the tape itself and an associated field effect that can discharge through or be induced upon items  
up to a foot away.  
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11.4.2. Basic anti-ESD Procedures for Analyzer Repair and  
Maintenance  
11.4.2.1. Working at the Instrument Rack  
When working on the analyzer while it is in the instrument rack and plugged into a properly grounded  
power supply.  
1. Attach your anti-ESD wrist strap to ground before doing anything else.  
Use a wrist strap terminated with an alligator clip and attach it to a bare metal portion of the  
instrument chassis. This will safely connect you to the same ground level to which the  
instrument and all of its components are connected.  
2. Pause for a second or two to allow any static charges to bleed away.  
3. Open the casing of the analyzer and begin work. Up to this point, the closed metal casing of your  
analyzer has isolated the components and assemblies inside from any conducted or induced  
static charges.  
4. If you must remove a component from the instrument, do not lay it down on a non-ESD  
preventative surface where static charges may lie in wait.  
5. Only disconnect your wrist strap after you have finished work and closed the case of the analyzer.  
11.4.2.2. Working at an Anti-ESD Work Bench.  
When working on an instrument of an electronic assembly while it is resting on an anti-ESD work bench:  
1. Plug your anti-ESD wrist strap into the grounded receptacle of the work station before touching  
any items on the work station and while standing at least a foot or so away. This will allow any  
charges you are carrying to bleed away through the ground connection of the workstation and  
prevent discharges due to field effects and induction from occurring.  
2. Pause for a second or two to allow any static charges to bleed away.  
3. Only open any anti-ESD storage bins or bags containing sensitive devices or assemblies after  
you have plugged your wrist strap into the workstation.  
Lay the bag or bin on the workbench surface.  
Before opening the container, wait several seconds for any static charges on the outside  
surface of the container to be bled away by the workstation’s grounded protective mat.  
4. Do not pick up tools that may be carrying static charges while also touching or holding an ESD  
Sensitive Device.  
Only lay tools or ESD-sensitive devices and assemblies on the conductive surface of your  
workstation. Never lay them down on any non-ESD preventative surface.  
5. Place any static sensitive devices or assemblies in anti-static storage bags or bins and close the  
bag or bin before unplugging your wrist strap.  
6. Disconnecting your wrist strap is always the last action taken before leaving the workbench.  
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11.4.2.3. Transferring Components from Rack to Bench and Back  
When transferring a sensitive device from an installed Teledyne Instruments analyzer to an Anti-ESD  
workbench or back:  
1. Follow the instructions listed above for working at the instrument rack and workstation.  
2. Never carry the component or assembly without placing it in an anti-ESD bag or bin.  
3. Before using the bag or container allow any surface charges on it to dissipate:  
If you are at the instrument rack, hold the bag in one hand while your wrist strap is connected to  
a ground point.  
If you are at an anti-ESD workbench, lay the container down on the conductive work surface.  
In either case wait several seconds.  
4. Place the item in the container.  
5. Seal the container. If using a bag, fold the end over and fastening it with anti-ESD tape.  
Folding the open end over isolates the component(s) inside from the effects of static fields.  
Leaving the bag open or simply stapling it shut without folding it closed prevents the bag from  
forming a complete protective envelope around the device.  
6. Once you have arrived at your destination, allow any surface charges that may have built up on  
the bag or bin during travel to dissipate:  
Connect your wrist strap to ground.  
If you are at the instrument rack, hold the bag in one hand while your wrist strap is connected to  
a ground point.  
If you are at a anti-ESD work bench, lay the container down on the conductive work surface  
In either case wait several seconds  
7. Open the container.  
11.4.2.4. Opening Shipments from Teledyne Instruments Customer Service.  
Packing materials such as bubble pack and Styrofoam pellets are extremely efficient generators of static  
electric charges. To prevent damage from ESD, Teledyne Instruments ships all electronic components  
and assemblies in properly sealed anti-ESD containers.  
Static charges will build up on the outer surface of the anti-ESD container during shipping as the packing  
materials vibrate and rub against each other. To prevent these static charges from damaging the  
components or assemblies being shipped make sure that you always unpack shipments from Teledyne  
Instruments Customer Service by:  
1. Opening the outer shipping box away from the anti-ESD work area.  
2. Carry the still sealed ant-ESD bag, tube or bin to the anti-ESD work area.  
3. Follow steps 6 and 7 of Section 11.4.2.3 above when opening the anti-ESD container at the work  
station.  
4. Reserve the anti-ESD container or bag to use when packing electronic components or  
assemblies to be returned to Teledyne Instruments.  
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11.4.2.5. Packing Components for Return to Teledyne Instruments Customer  
Service.  
Always pack electronic components and assemblies to be sent to Teledyne Instruments Customer  
Service in anti-ESD bins, tubes or bags.  
WARNING  
DO NOT use pink-poly bags.  
NEVER allow any standard plastic packaging materials to touch the electronic  
component/assembly directly  
This includes, but is not limited to, plastic bubble-pack, Styrofoam peanuts,  
open cell foam, closed cell foam, and adhesive tape  
DO NOT use standard adhesive tape as a sealer. Use ONLY anti-ESD tape  
1. Never carry the component or assembly without placing it in an anti-ESD bag or bin.  
2. Before using the bag or container allow any surface charges on it to dissipate:  
If you are at the instrument rack, hold the bag in one hand while your wrist strap is connected to  
a ground point.  
If you are at an anti-ESD workbench, lay the container down on the conductive work surface.  
In either case wait several seconds.  
3. Place the item in the container.  
4. Seal the container. If using a bag, fold the end over and fastening it with anti-ESD tape.  
Folding the open end over isolates the component(s) inside from the effects of static fields.  
Leaving the bag open or simply stapling it shut without folding it closed prevents the bag from  
forming a complete protective envelope around the device.  
NOTE  
If you do not already have an adequate supply of anti-ESD bags or containers available, Teledyne  
Instruments’ Customer Service department will supply them. Follow the instructions listed above  
for working at the instrument rack and workstation.  
:
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