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Murphy Level Swichgage Instrument OPLHC-20

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Murphy Surface Mount 0-20 Ft Level Swichgage 4-1/2 in. with Square Case - OPLHC-20

Product Condition: NEW
Murphy Surface Mount Level Swichgage Instrument with Square Case and Bronze Bourdon Sensing Element OPLHC-20
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy Surface Mount 0-20 Ft Level Swichgage 4-1/2 in. with Square Case OPLHC-20 is a combination level indicating gage with adjustable low and high limit switch. Limit switch can be wired directly to electric pilot circuits to operate alarms, shutdown or start/stop pumps to maintain predetermined levels. This OPLHC-20 features a panel mount enclosure and 4-1/2 in. (114 mm) dial for easy viewing, it also includes 2-adjustable, pilot duty, pointer type contacts. Contacts have self-cleaning motion to enhance electrical continuity. Adjustable limit switch is accessible from front of the Swichgage instrument.

The OPLHC-20 operates from static head pressure. Pressure is transmitted to the process connection of the Swichgage instrument. From here the pressure flexes the bourdon tube. The bourdon tube operates the stainless steel rotary geared movement which in turn operates the indicating pointer on the face of the dial. When the pointer closes with the limit contact, a control circuit is completed and signals an alarm and/or shutdown or starts/stops a pump.

Applications: Saltwater Disposal Systems • Waterflood Systems • Diesel Day Tanks • Oil Storage Tanks


  • Bourdon Tube, Bronze/Brass (standard)
  • Surface Mount with Square Case
  • 4-1/2 in. (114 mm) Dial
  • 0–20 ft. (0–6 m) dual scale dial
  • Eliminates under/overfill due to “human error”
  • 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



  • Part No.: OPLHC-20
  • Range: 0–20 ft. (0–6 m) dual scale dial
  • Case: Die cast aluminum
  • Dial: 4-1/2 in. (114 mm), white on black background
  • Conduit: Square case: 1/2 NPT, conduit
  • Overrange: Do not exceed 10% above full range
  • Accuracy: 3% full scale
  • Limit Switch Ratings: Pointer Contacts SPDT center off; 2 A, 30 VDC, 1 A, 125 VAC
  • Sensing Element: Bourdon Tube, Bronze/Brass (standard)
  • Process Connections: 1/4 NPT Male
  • Geared Movement: 300 series stainless steel
  • Item Dimensions: 16 x 11 x 5-1/2 in. (406 x 279 x 140 mm)
  • Item Weight: 8 lb. (3.6 kg) approximately

Additional Information

Product Condition NEW
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