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Murphy Dual Temperature Swichgage 100-350 VDC MDTM89-F-A-J

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Murphy 0-1999F Dual Temperature Swichgage 100-350 VDC CD Ignition - Negative Ground FET Outputs- MDTM89-F-A-J

Product Condition: NEW
Murphy 100-350 VDC CD Ignition Dual Temperature Swichgage 0-1999F with Type J Thermocouple MDTM89-F-A-J
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy 0-1999F Dual Temperature Swichgage 100-350 VDC MDTM89-F-A-J is an electronic, dual-temperature monitor. It monitors two thermocouples, displays the temperature of the thermocouple selected, and has adjustable trip points for each input. A toggle switch provides for selection of the thermocouple to be displayed and/or the temperature trip point to be checked/adjusted. If either trip point is reached, the associated output “turns on” and can be used as a control signal, or to initiate alarms and/or shutdown. A “Push to Read” button, located below the selector switch, allows the operator to check the trip point and to see its value as adjustments are made. Two potentiometers, one on each side of the thermocouple selector switch, are provided for field-adjustment of the trip points.

Applications includes: Compressor suction/discharge temperature • Engine/compressor jacket water temperature • Engine exhaust temperature • Compressor cylinder temperature • After cooler temperature • Bearing temperature.



  • FET (field effect transistor) Output
  • Monitor Inputs From Two Thermocouples
  • Adjustable Switch Trip Point For Each Input
  • Power From CD Ignition
  • Type J Ungrounded Thermocouple
  • Digital Reading in Fahrenheit



  • Part No.: MDTM89-F-A-J
  • Calibration: Fahrenheit
  • Case: Die cast aluminum
  • Thermocople type: Ungrounded J
  • Power Requirements (Operating Voltages): 100 to 350 VDC, CD ignition, negative ground (FET "field effect transistor" outputs) 0.5A @ 250 VDC maximum
  • Power Consumption: CD ignition: 350 μa @ 100V; 24 VDC: 0.5 watts
  • Output: output turns on above trip point; output turns off below trip point; two (2) isolated 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)
  • Reset Differential: FET models: Decreases 3 Degrees (°F)
  • Measurement Range: Monitor Range 0-1999°F
  • Accuracy: from 150-1200°F (66-649°C) ±1.5% of reading
  • Laboratory Approvals: CSA and Factory Mutual* 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
  • Shipping Weight: 48 ozs (1.4 kg)
  • Shipping Dimensions: 10 x 9-1/2 x 6 in. (254 x 241 x 152 mm)

Additional Information

Product Condition NEW
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