Specifications
Power Requirements (Operating Voltages):
MDTM89-A: 100 to 350 † VDC, CD ignition, negative ground (FET outputs).
MDTM89-E: 100 to 350 † VDC, CD ignition, negative grounds (FET outputs).
MDTM89-B: 100 to 350 † VDC, CD ignition, negative or positive ground (SCR outputs).
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) (FET outputs.) Model NOT approved by
CSA or Factory Mutual.
Power Consumption: CD ignition: 350 μa @ 100V; 120 VAC: 0.6 watts; 24 VDC: 0.5 watts.
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.
Models A, C and D: output turns on above trip point; output turns off below trip point; two (2) isolated FET outputs, 0.5 amp @ 250 VDC.
Model E: output one turns on above trip point, output turns off below trip point: output 2 turns on below trip point, output turns off above trip point: two (2) isoloated FET outputs, 0.5 amp @250 VDC.
Ambient Cold Junction Compensation Range: 32 to 122°F (1°C from 0 to 50°C).
Operating Temperature: -4 to 158°F (-20 to 70°C).
Storage Temperature: -40 to 300°F (-40 to 150°C).
Case: Die cast aluminum.
Reset Differential: FET models: Decreases 3 Degrees (°F or °C).
SCR model: turn input power off to reset.
Measurement Range: Monitor Range 0-1999°F or °C (specify “F” or “C” in part number).
Accuracy: With J-type thermocouple: from 150-1200°F (66°-649°C) ±1.5% of reading.With K-type thermocouple: from 400-2000°F (204-1076°C) ±1.5% of reading. At calibration temperature.
Laboratory Approvals: CSA 1 and Factory Mutual 2 approved for Class I, Division 2, Group D, hazardous locations).
Thermocouple Lead Length: 150 ohm lead resistance affects monitor accuracy less than 1°.
Trip Point Accuracy: ±3°F (±2°C) of reading.
Trip Point Adjustment Range: 0-1999 Degrees.
1 When used with approved ignitions or 12-24 VDC. Contact Murphy for details.
2 Approved for CD ignition, 80–250 VDC.
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