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FW Murphy OPL Gauge and Limit Switch
The OPL-series pressure gage instruments are combination pressure indicating gages with adjustable low and high limit switches.
Limit switches can be wired directly to electric pilot circuits to operate alarms, shutdown or the start/stop of engines and electric motors. Surface mount or panel mount enclosure is available for most versions. All versions feature a 4-1/2 in. (114 mm) dial for easy viewing. Adjustable limit switches are accessible from the front of the gage. Limit contacts have self-cleaning motion to enhance electrical continuity.
FW Murphy OPL Gauge and Limit Switch


Die cast aluminum; weatherproof.
Contact Ratings:
OPLC and OPLFC - 1 SPDT; Center off; 2A, 30 VDC / 1A, 125 VAC pilot duty
OPLBP - SPDT dry relay contacts; 10A, 125 VAC
4-1/2 in. (114 mm) white on black, dual scaled psi /kPa
Gage Accuracy:
2-1-2 ±2% for the first and last quarters of the scale, the middle half is ±1%.


  • Combination Indicating Gage and Critical Pressure Limit Switches
  • High and Low Pressure Limit Contacts Are Visible and Adjustable
  • Panel and Surface Mount Versions
  • Indicating-only Gage Available
  • Latching Control Relay Versions Available