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Murphy 0-30 PSI Differential Pressure Swichgage A20DP-30

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Murphy 0-30 PSI Mechanical Differential Pressure Swichgage 2 in. w/ Polycarbonate Case - A20DP-30

Product Condition: NEW
Murphy 30 PSI Differential Pressure Swichgage with Polycarbonate Case A20DP-30
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy 0-30 PSI Mechanical Differential Pressure Swichgage 2" A20DP-30 is a diaphragm-actuated differential pressure-indicating gage with a built in electrical switch. This switch is used for tripping alarms and/or shutting down equipment. The swichgage A20DP-30 is intended to monitor and indicate oil, fuel or water filter restriction and can reduce the risk of dangerously high pressure which may rupture the filter, resulting in contaminants entering the system. This model has a polycarbonate case and are sealed from the environment.

The gage pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have self-cleaning motion to ensure electrical continuity.


  • 2 inch/51 mm Dial
  • Polycarbonate Case
  • Monitors Engine Oil and Fuel Filters
  • Actuates Alarm or Shutdown System When Filter Becomes Clogged
  • Combination Indicating Gage and Limit Switch
  • Actuates Filter Backwash
  • Signals Coolant Loss or Aeration On Engine Water Pump



  • Part No.: A20DP-30
  • Range: 0-30 psi/0-207 kPa [0-2.0 bar]
  • Maximum Static Pressure: 300 (2.1) [20]
  • Maximum Differential Pressure: 60 (414) [4.0]
  • Contact Setting: 20 (138) [1.0]
  • Dial: White on black, dual scale
  • Case: polycarbonate
  • Bezel: Polished stainless steel
  • Lens: Polycarbonate, high-impact
  • Process Connection: 1/8-27 NPTM brass
  • Sensing Element: Beryllium copper diaphragm
  • Gage Accuracy: ±3% maximum across scale
  • Temperature Range: Ambient: -40°F (-40°C) thru 150°F (66°C);Process: -40°F (-40°C) thru 250°F (121°C)
  • Adjustable Limit Contact: SPST contact; pilot- duty only, 2 A @ 30 VAC/DC; closed when the low limit is met, open when pointer is in normal operating range. Contacts are gold flashed silver
  • Limit Contact Adjustment: by 1/16 in. hex wrench thru 100% of scale
  • Limit Contact Terminals: number #4 screw terminals
  • Unit Weight: 9 oz. (0.25 kg)
  • Unit Dimensions: 3 x 2-3/4 x 2-3/4 in. (76 x 70 x 70 mm)

Additional Information

Product Condition NEW
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