MDTM-8907N
Revised 10-07
Section 10
Instructions for Installation and Operation
Model Series MDTM89,
(00-02-0165)
®
Dual Temperature SWICHGAGE
Please read the following information before installing. A visual inspection before mounting for any damage during shipping is
recommended. General information and installation instructions are intended for all MDTM89 Series models.
GENERAL INFORMATION
WARNING
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT
✔
Disconnect all electrical power to the machine.
✔
Make sure the machine cannot operate during installation.
✔
Follow all safety warnings of the machine manufacturer.
✔
Read and follow all installation instructions.
†
††
Description
Murphy's model MDTM89 is an electronic, dual-temperature moni-
Storage Temperature: -40 to 300°F (-40 to 150°C).
tor. It monitors two thermocouples, displays the temperature of the
Case: Die cast aluminum.
thermocouple selected, and has adjustable trip points for each input.
Reset Differential: FET models: Decreases 3 Degrees (°F or °C).
A toggle switch provides for selection of the thermocouple to be dis-
SCR model: turn input power off to reset.
played and/or the temperature trip point to be checked/adjusted. If
Measurement Range: Monitor Range 0-1999°F or °C (specify “F” or
either trip point is reached, the associated output “turns on” and can
“C” in part number).
be used as a control signal, or to initiate alarms and/or shutdown.
Accuracy: With J-type thermocouple: from 150-1200°F (66°-649°C)
1.5% of reading. With K-type thermocouple: from 400-2000°F
Specifications
(204-1076°C) 1.5% of reading. At calibration temperature.
Power Requirements (Operating Voltages):
†
††
Laboratory Approvals: CSA and Factory Mutual approved for
††
MDTM89-A: 100 to 350 VDC, CD ignition, negative
Class I, Division 2, Group D, hazardous locations).
Thermocouple Lead Length: 150 ohm lead resistance affects moni-
ground (FET outputs).
††
MDTM89-B: 100 to 350 VDC, CD ignition, negative or
tor accuracy less than 1°.
positive ground (SCR outputs).
Trip Point Accuracy: 3°F ( 2°C) of reading.
Trip Point Adjustment Range: 0-1999 Degrees.
†
MDTM89-C: 12 to 24 VDC, negative ground, 15 milliwatts
(FET outputs).
MDTM89-D: 120 VAC (MDTM89-C with 120 V isolation module #IT-1)
MDTM89 Interface Capabilities
(FET outputs.) Model NOT approved by CSA or Factory Mutual.
Model
Power Source
Rating
Power Consumption: CD ignition: 350 µa @ 100V;
*
*
**
LCDT
S1400
CD Ign., 120 VAC, 12/24 VDC Cl.I, Div.1, Gr.D, Haz. areas
120 VAC: 0.6 watts; 24 VDC: 0.5 watts.
120 VAC or 12/24 VDC
MARK II and IV CD Ignition, pos. or neg. grnd
Cl.I, Div.1, Gr.D, Haz. areas
Cl.I, Div.2, Gr.D, Haz. areas
Outputs: Model B: output turns on above trip point; output turns off
when power is switched off; two (2) isolated SCR outputs, 0.5 amp
@ 250 VDC.
®
TATTLETALE
CD Ign., 120 VAC, 12/24 VDC Non-Hazardous areas
*
An isolation barrier is needed between the MDTM89 and an Annunciator rated for
Models A, C and D: output turns on above trip point; output turns off
Class I, Division 1, Group D, Hazardous Areas.
below trip point; two (2) isolated FET outputs, 0.5 amp @ 250 VDC.
**
When used with approved ignition. Contact Murphy for details.
†
Ambient Cold Junction Compensation Range:
When used with approved ignitions or 12-24 VDC. Contact Murphy for details.
††
32 to 122°F (1°C from 0 to 50°C).
Approved for CD ignition, 80–250 VDC.
Operating Temperature: -4 to 158°F (-20 to 70°C).
MDTM-8907N page 1 of 4
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WIRING AND ADJUSTMENT INFORMATION
CAUTION: The use of non thermocouple wire will cause
D. Connecting Power Wires
inaccurate temperature sensing and erratic operation.
1. Determine the voltage and the polarity of the input power before
attempting to connect the power leads to the MDTM89.
2. On CD ignitions, connect the shutdown lead to the MDTM89
ignition input as shown in the diagrams below.
3. When connecting the thermocouple extension wire to your thermo-
couple leads, twist the wire connections, then install wire nuts,
such as ceramic type, which have no metal insert.
DO NOT SOLDER.
Operation Test
NOTE: Perform the Operation Test after the MDTM89 is installed and wired
To prevent problems of interference from electrical noise, DO NOT
route thermocouple wires in the same conduit or within 12 inches
(304 mm) of ignition wires or alternating current conductors.
Metallic-overbraided, thermocouple wire is recommended. It pro-
vides electrical shielding as well as protection against wear and
abrasion.
appropriately.
1. a. Rotate the trip point potentiometers TC1 and TC2 clockwise until an
audible click is heard or detente is felt. These are 12-turn
potentiometers.
b. Start the engine or power up the monitor.
2. a. Set the display selector switch to the TC1 position to display the TC1
temperature.
B. Connecting Thermocouple Wires (ungrounded thermocouple)
1. Remove factory installed jumpers or shunts from TC1 and TC2
terminals before connecting thermocouple(s).
b. Next depress and hold the “Push to Read” trip point push button to
display the TP1 setting.
c. Rotate the TC1 trip point potentiometer counterclockwise until the
display reading is equal to the temperature reading observed in
step 2. a.
2. Connect the thermocouple leads to the thermocouples. Observe
lead polarity. See Table 1 for thermocouple extension lead color
code and thermocouple polarity.
d. Trip point TP1 will turn on and trip the shutdown device or alarm;
verify by observation.
NOTE: Before continuing to the next step, decide which thermocouple
is to be identified as TC1 and which is to be identified as TC2.
A wire marker should be installed on each end of the thermocou-
ple lead to identify TC1 and TC2.
e. Rotate the trip point potentiometer TC1 clockwise several turns to
turn off TP1.
f. Reset alarm or shutdown device.
3. a. Set the display selector switch to the TC2 position to display the TC2
3. Connect the positive lead of thermocouple TC1 to the positive (+)
terminal of terminal strip TC1.
4. Connect the negative lead of thermocouple TC1 to the negative (-)
terminal of terminal strip TC1.
5. Connect the positive lead of thermocouple TC2 to the positive (+)
terminal of terminal strip TC2.
6. Connect the negative lead of thermocouple TC2 to the negative (-)
terminal of terminal strip TC2.
temperature.
b. Next, depress and hold the “Push to Read” trip point push button to
display the TP2 setting.
c. Rotate the TC2 trip point potentiometer counterclockwise until the
display reading is equal to the temperature reading observed in
step 3.-a.
d. Trip point TP2 will turn on and trip the shutdown device or alarm;
verify by observation.
e. Rotate trip point potentiometer TC2 clockwise several turns to turn
off TP2.
C. Connecting Output Wires
f. Reset alarm or shutdown device.
®
Wire the SWICHGAGE trip point outputs as shown in the typical
wiring diagrams on the back of this page.
TRIP POINT ADJUSTMENT INFORMATION
Trip Point Adjustments
Face Plate Diagram
B
1. Power up the temperature monitor by turning on power or by
starting engine.
2. Set the display selector switch to the TC1 position.
3. Depress the “Push to Read” trip point push button to read trip point.
4. Rotate the trip point potentiometer TC1 until the display indicates
the desired trip point temperature for TC1.
5. Set the display selector switch to TC2 position.
6. Depress the “Push to Read” trip point push button to read the
trip point.
7. Rotate the trip point potentiometer TC2 until the display indicates
the desired trip point temperature for TC2.
A
B
C
D
. Trip point/display
toggle switch.
C
. Readout digital
A
display.
. Trip point
potentiometers.
D
. Push to read trip
DETAIL
12 turn
point button.
potentiometers
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TYPICAL WIRING DIAGRAMS
Thermocouple
TC1 Input
See Table 1 for
wire color code.
12/24
VDC
12/24
NC
NEG
TC1
TC2
12/24 VDC Power
TP1
TP2
Load
Thermocouple
Load
TC2 Input
See Table 1 for
wire color code.
Power
Source
Power
Source
Thermocouple
TC1 Input
See Table 1 for
wire color code.
120 VAC/24 VDC
Isolation
Module
12/24
NC
NEG
H
TC1
TC2
ISOLATION
120 VAC
N
24 VDC
MODULE
TP1
TP2
120 VAC Power
Option NOT approved by
CSA or Factory Mutual
Load
Thermocouple
Load
TC2 Input
See Table 1 for
wire color code.
Power
Source
Power
Source
Thermocouple
TC1 Input
See Table 1 for
wire color code.
CD
Negative
Ground
Ignition
100-150 VDC
150-350 VDC
100-150
150-350
NEG
TC1
TC2
CD Ignition—Negative Ground
TP1
TP2
Load
Thermocouple
Load
TC2 Input
See Table 1 for
wire color code.
Power
Source
Power
Source
TPI
Typical TTD Hook-up
Warranty
A limited warranty on materials and workmanship is given with this FW Murphy product.
FW MURPHY
P.O. Box 470248
COMPUTRONIC CONTROLS, LTD
41 - 43 Railway Terrance Nechells
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819
Tulsa, Oklahoma 74147 USA
+1.918.317.4100 Fax: +1.918.317.4266
E-mail: [email protected]
Birmingham B7 5NG UK
Rosenberg, Texas 77471 USA
Phone: 281.633.4500 Fax: 281.633.4588
E-mail: [email protected]
Phone: +44.1213.278500 Fax: +44.1213.278501
E-mail: [email protected]
INDUSTRIAL PANEL DIVISION
Fax: 918.317.4124
E-mail: [email protected]
FW MURPHY INSTRUMENTS (HANGZHOU) CO. LTD
77 23rd Street
FRANK W. MURPHY, LTD
Church Rd Laverstock
Hangzhou Economic & Technological Development Area
Hangzhou, Zhejiang, 310018, China
Phone: +86.571.8684.8886 Fax: +86.571.8684.8878
Salisbury SP1 1QZ UK
MURPHY POWER IGNITION
Phone: +44.1722.41005 Fax: +44.1722.410088
E-mail: [email protected]
www.
.com
Printed in U.S.A. 0889795
In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
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