Bacharach Carbon Monoxide Alarm 19 7038 User Manual

DIOXOR®II  
INSTRUCTION 19-9121  
Portable SO2 Analyzer  
Part No. 19-7038 & 19-7043  
Rev. 5 - September 1997  
Bacharach, Inc.  
625 Alpha Drive, Pittsburgh, PA 15238  
(412) 963-2157/2164 Fax: (412) 963-2640  
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Printed in U.S.A.  
® Registered Trademarks  
WARNING!  
Because this instrument is used to detect and monitor materials and conditions which are listed by OSHA  
or others as potentially hazardous to personnel and property, the information in this manual must be fully  
understood and utilized to ensure that the instrument is operating properly and is both used and maintained  
in the proper manner by qualified personnel. An instrument that is not properly calibrated, operated and  
maintained by qualified personnel is likely to provide erroneous information, which could prevent user  
awareness of a potentially hazardous situation for the instrument user, other personnel and property.  
If, after reading the information in this manual, the user has questions regarding the operation, application  
or maintenance of the instrument, supervisory or training assistance should be obtained before use.  
Assistance is available by calling your nearest Bacharach Service Center.  
1 INTRODUCTION  
®
The Dioxor II is a commercial-grade  
portable instrument designed to display  
concentrationsofsulfurdioxide(SO2)gas  
between0and2000 ppm. Thisinstrument  
shows the presence of SO2 in a gas sample  
bydrawingthesampleintoitssensorcham-  
ber by a built-in motorized pump. Part  
#19-7038 comes with a probe. Part #19-  
7043 comes without a probe (All non-  
proberelatedfunctionsremainthesamein  
this instruction).  
Other features and accessories of the  
DioxorIIinclude:Alarge, back-litLiquid  
Crystal Display (LCD), which allows the  
displaytobereadinanylightingcondition  
from direct sun-light to total darkness; a  
semi-detachable elastic strap that permits  
the instrument to be either hand held, or  
hung on nearby objects; a rigid stainless  
steel probe with handle, connected to a  
flexiblehosewithsamplefilterthatallows  
gassamplestobetakenfromcrampedand  
confined areas (alternate probes and  
Figure 1. Dioxor II  
condensate traps may be used).  
1
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2 TECHNICAL CHARACTERISTICS  
SO2 Display Range ........... 0-1999 ppm SO2  
Accuracy ........................... ±10 ppm or ±5% of reading  
whichever is greater  
Response Time ................. 90% of final value within 40 sec.  
Battery Requirements ....... 1.5 V, “C” cells, Qty. 4  
Operating Time* ............... 14-16 hours, alkaline cells  
Operating Temp. Range .... 23 to 104°F (–5 to 40°C)  
Relative Humidity ............. 10-85% non-condensing  
Weight (w/o batteries) ...... 12 ozs. (341 grams)  
Dimensions ....................... 8.6 x 3.5 x 2.9 inches (218 x 89 x 74 mm)  
* Times are with the backlight turned off. Continuous use of the  
backlight will decrease battery life.  
3 PREPARING THE DIOXOR II  
FOR OPERATION  
To prepare the instrument for operation, you  
must install four “C” size batteries, and (if  
desired) install the hose and probe as described  
in the following paragraphs.  
For your convenience, and to ensure that the  
instrument will provide reliable SO2 indica-  
tions, the SO2 sensor is installed and the instru-  
ment calibrated on a known SO2 concentration  
at the factory.  
3.1 Battery Installation  
Detach the elastic strap's metal clip at the bot-  
tom of the instrument, and slide off the battery  
coverasshowninFigure 2. Thenwhileobserv-  
ingproperbatterypolarity, installfourCsize  
batteriesintotheinstrument’sbatterycompart-  
ment. (Recommended battery types: Duracell  
Alkaline or equivalent). After the batteries are  
installed, replace the battery cover and the  
elastic-strap clip.  
Figure 2. Battery  
Installation  
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If batteries are accidently installed in the wrong polarity, a positive  
temperaturecoefficient(PTC)thermistorwillprotecttheinstrument’s  
electronic circuity. The instrument will operate once batteries are  
properly installed and the PTC thermistor is allowed to cool.  
3.2 Probe Installation  
The probe comes disassembled. To add the probe tip:  
a. Loosen but DO NOT REMOVE the Knurled Nut (03-2023) on  
the main part of the Probe Assembly (19-3076).  
b. Insert probe tube into Extended Adapter Block (19-3072).  
c. Hand tighten the Knurled Nut (03-2023) then add 1/4 turn to  
snug probe to the rest of the probe assembly.  
NOTE: In order to prevent the possibility of misplacing the  
Front (03-2024) and Back (03-2025) Ferrules, loosen but  
DO NOT REMOVE the Knurled Nut (03-2023) before  
inserting or removing the Probe Tube (19-3073).  
Install the probe by sliding the end of its tubing over the gas inlet port  
onthetoprightsideoftheinstrumentasshowninFigure 3. Thetubing  
may be difficult to slide over the gas inlet port of the unit for the first  
time.Thiswasdoneintentionallytoallowforasnugfit.Usealittledish  
washing liquid diluted in water or heat the end of the tube in hot tap  
water to help it slide onto the port.  
Figure 3. Probe Installation  
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3
4 OPERATION  
To operate the Dioxor II, you simply . . .  
Set its POWER switch to ON,  
Wait for the instrument to warm up (approx. 1 minute),  
Zero the display (if necessary),  
Take a gas sample.  
Detailed operating procedures are presented below:  
4.1 Power ON/OFF  
Turn on the instrument by sliding its POWER  
switch to ON. Observe that when power is first  
applied, all numerical LCD segments are tested for  
5-15 seconds; after which, the LCD shows the detected SO2 level. (A  
minus sign may appear during power up as the sensor stabilizes.) Turn  
off the instrument by sliding the POWER switch to OFF.  
Important!Whenstoringtheinstrumentforextendedperiodsoftime,  
remove the batteries and ensure that the POWER switch is OFF. The  
OFF position places a short across the SO2 sensor, thus keeping the  
sensor from being destabilized while not in use.  
4.2 Zeroing the Instrument  
After being turned on and warmed up for at least 1 minute, the  
instrument should indicate 000 ±5 ppm in fresh air. If the instrument  
needs to be zeroed, proceed as follows:  
1. Ensure that the instrument is sampling air that is free of sulfur  
dioxide.  
NOTE: An indication that the instrument was not zeroed in fresh  
air is when a large negative SO2 display appears when the  
instrument is moved into another area.  
2. Using a 1/8" flat-blade screwdriver, turn the  
ADJUST potentiometer until the LCD shows 0  
ppm. The display shows negative numbers for  
zeroing purposes. An instrument can be considered zeroed with a  
display bounce of up to ±3 ppm.  
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4
4.3 Backlight ON/OFF  
The LCD can be read in low-light areas by setting the front panel  
LIGHT switch to ON. The backlight stays on until turned off, or until  
the POWER switch is set to OFF.  
4.4 Using the Strap  
The instrument's elastic strap allows the unit to be either hand-held, or  
hung on nearby objects.  
By sliding your hand between the instrument and its elastic strap, you  
canholdontotheDioxorIIwithaminimumofeffort. Theinstrument's  
front panel slide switches can then be actuated by your thumb for one-  
handed operation. Or, by releasing the metal clip at the bottom of the  
instrument's case, you can hang the instrument by its strap on nearby  
objects such as nails, sheet metal, or valve handles.  
4.5 Using the Probe  
A rigid stainless steel probe with handle, connected to a flexible hose  
with sample filter can be used to draw a gas sample into the instrument  
from the room, boilers, and other combustible furnaces.  
Both hose and probe are detachable from the instrument when sam-  
pling without the probe, or when sampling with a different probe is  
desired.  
Important: If condensation is observed within the hose, do not allow  
water level to build up to a point where it cuts off flow.  
4.6 Interpreting the Display  
Gas Display  
The LCD shows SO2 levels in the range from 0 to  
1999ppm. ThedisplayontherightindicatesanSO2  
level of 025 ppm.  
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5
Overrange  
When the gas sample exceeds 1999 ppm, a “1” is  
displayed on the LCD. To clear an overrange con-  
dition, leave the instrument turned on and sample  
fresh air until the LCD returns to displaying SO2.  
Low Battery Indications  
When the battery voltage becomes low, the “LO  
BAT” indicator appears. Although the instrument  
will continue to operate and give SO2 readings  
under these conditions, the batteries should be replaced as soon as  
possible.  
When the battery voltage becomes too low for the  
instrument to operate, a “-1” is displayed on the  
LCD. No SO2 readings are provided under these  
conditions.  
4.7 Long-Term Storage  
When storing the Dioxor II for extended periods of time, set its  
POWER switch to OFF and remove the batteries. The POWER OFF  
positionplacesashortacrosstheSO2 sensor,thuskeepingitfrombeing  
destabilized while not in use.  
5 MAINTENANCE  
The Dioxor II needs to be calibrated at regular intervals to ascertain  
that it still meets its accuracy specification. A regular calibration  
schedule should be established between you and your nearest Bachar-  
ach Service Center, unless your facility has the necessary calibration  
equipment and personnel trained in the maintenance of gas-detection  
equipment.Detailedcalibrationproceduresareprovideduponrequest  
from the factory. Detailed maintenance procedures and parts lists are  
provided in the Service Manual (19-9166).  
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6
6 PARTS/SERVICE  
6.1 Parts List  
Item  
Part No.  
Battery Cover  
Probe/Hose Assy.  
19-3029  
19-3076  
6.2 Bacharach Sales/Service Centers  
United States  
Bacharach S/S Center  
7281 Garden Grove Blvd.  
Suite H  
Garden Grove, CA 92841  
(714) 895-0050  
Bacharach S/S Center  
625 Alpha Drive  
Pittsburgh, PA 15238  
(412) 963-2164/2157  
(412) 963-2640 FAX  
(714) 895-7950 FAX  
Bacharach S/S Center  
8618 Louisiana Place  
Merrillville, IN 46410  
(219) 736-6178  
International  
(219 736-6269 FAX  
Bacharach, Instruments Int'l  
58 Kongensgade  
DK 6070 Christiansfeld  
Denmark  
45 (74) 563171  
45 (74) 563178 FAX  
Bacharach S/S Center  
7300 Industrial Park  
Rt. 130, Bldg. 22  
Pennsauken, NJ 08110  
(609) 665-6176  
(609) 665-6661 FAX  
Bacharach of Canada  
Bacharach S/S Center  
5151 Mitchelldale, B-4  
Houston, TX 77092  
(713) 683-8141  
101 Amber Street, Unit #1  
Markham, Ontario L3R 3B2  
(905) 470-8985/8039  
(905) 470-8963 FAX  
(713) 683-9437 FAX  
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7
7 HAZARDS OF SULFUR DIOXIDE  
Properties:  
Sulfurdioxide(SO2)isacolorless, nonflammablegasthathasastrong  
pungent odor, is twice as heavy as air, and is highly corrosive to  
ordinary metals when mixed with water vapor.  
Physiological Effects:  
Exposure to sulfur dioxide gas in low concentrations produces an  
irritatingaffectonthemucousmembranesoftheeyes,nose,throat,and  
lungsduetotheformationofsulfurousacidasthegascomesincontact  
with the moisture on these surfaces.  
Acuteexposurethroughinhalationmayresultindrynessandirritation  
of the nose and throat, choking, sneezing, coughing, and broncho-  
spasm. Severe overexposure may cause death through pulmonary  
edema(abnormalfluidbuildupinthelungs),orfromrespiratoryarrest.  
Prolonged or repeated exposure may cause impaired lung function,  
bronchitis, hacking cough, nasal irritation and discharge, increased  
fatigue, alteration in the senses of taste and smell, and longer duration  
of common colds.  
PPM Level Attributes:  
1 ppm  
2 ppm  
Injurious to plant foliage.  
Eight-hour time-weighted average (TWA) expo-  
sure limit set by the U.S. Occupational Safety and  
Health Administration (OSHA)[1][2]  
.
3 ppm  
Noticeable odor.  
6 to 300 ppm  
Immediate irritation of the nose and throat.  
300 to 500 ppm Immediately dangerous to life.  
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First Aid:  
Move victims to fresh air. If breathing has ceased, begin artificial  
respiration immediately. Administer oxygen if exposure has been  
severe and breathing is difficult. Seek medical attention immediately.  
References:  
[1] Code of Federal Regulations, Title 29 CFR Parts 1900-1910  
(Labor), Superintendent of Documents, U.S. Government Printing  
Office, Washington, DC 20402.  
[2] ThresholdLimitValuesandBiologicalExposureIndices, 1989-90  
ed., American Conference of Governmental Industrial Hygienists  
(ACGIH), 6500 Glenway Ave., Bldg. D–7, Cincinnati, OH 45211.  
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