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FW Murphy S1501

The Murphy Series 1501 instrument is a microprocessor-based alarm, shutdown and control system with tachometer/hourmeter function and can be configured to monitor applications such as air and gas compressors, natural gas refueling, and other industrial operations.

 The 1501 annunciates in alphanumerica characters to describe the protective device that has signaled an alarm or caused equipment to shutdown. Information is called up and adjustments are made on a six-button keypad on the face of the unit. Configurations such as: Alarm or Shutdown Nomenclature, Preset Timers, and Tachometer Calibration can be made in the field.

The complete Series 1501 system consists of a head (monitor), sensor input terminal strip (two needed for 64 sensor models), 36 inch (914 mm) flat ribbon cable(s) for connecting the terminal block to the head/monitor, and a Class I, Div. 1, explosion-proof power supply. 

FW Murphy S1501


Power Consumption:
120 VAC (7.5 VA), 12 VDC (3.5 watts), 24 VDC (3.5 watts)
Sensor Inputs
2 or 64 N.O. and/or N.C. inputs
Sensor Inputs Terminal Block
Rail mount DIN type; 32 terminals, screw type
Operating Temperatures
32 to 122°F (0 to 50°C)
Interface Output
Factory configured for RS232; field-selectable for RS485


  • 32 or 64 sensor inputs (N.O. or N.C.) for alarm or shutdown
  • Easy operation/adjustments Six-button keypad
  • RS232 or RS485 Modbus RTU communications
  • Automatic Engine Control
  • Two Start-Run Timers
  • Seven Control Relay Outputs
  • Pre/Postlube Time Delay
  • Automatic Compressor Loading