Dial Level Swichgage Instrument
Dial Level Swichgage Instrument


  • Combination level indicating gage and critical level limit switch
  • High and low level limit contacts are visible and adjustable
  • Designed to start and stop pumps to maintain specific levels
  • Indication only Murphygage® instrument available
  • Latching control relay versions available



The OPLHC/OPLHACS Series Level Swichgage instruments are combination level indicating gages with adjustable low and high limit switches. Limit switches can be wired directly to electric pilot circuits to operate alarms, shutdown or start/stop pumps to maintain predetermined levels.


Surface mount or panel mount enclosure is available for both model series. All models feature a 4-1/2 in. dial for easy viewing. Adjustable limit switches are accessible from front of the Swichgage instrument. Specialized models are available for specific applications involving engines or electric motors. 


OPLHC/OPLHACS Series Swichgage instruments include 2-adjustable, pilot duty, pointer type contacts. Contacts have self-cleaning motion to enhance electrical continuity. Models are available with a rugged bourdon-tube or 316 stainless steel bellows sensing element for greater accuracy and sensitivity in lower ranges.


A “freeze-proof” sensor of 316 stainless steel with Buna-N rolling diaphragm, is available. The “freeze-proof” sensor (OPLHAFP) inserts approx., 2 in. inside a tank.




Internal latching control relays are available to provide ON/OFF automation for electric motor applications.


OPLHC and OPLHACS series are avail- able in indication only Murphygage models (OPLHAGS).



  • Saltwater disposal systems
  • Waterflood systems
  • Diesel day tanks
  • Oil storage tanks


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