Murphy 0-75 PSI Mechanical Differential Pressure Swichgage 2-Inch - Plated Steel - 20DP-75

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The Murphy 0-75 PSI Mechanical Differential Pressure Swichgage 20DP-75 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. Gauge 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. The 20DP-75 mechanism is enclosed in a steel case coated to resist corrosion and it features a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect this rugged, built-to-last instrument.

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
  • 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.: 20DP-75
  • Range: 0-75 psi (0-517 kPa) [0-5.0 bar]
  • Maximum Static Pressure: 300 (2.1) [20]
  • Maximum Differential Pressure: 150 (1.0) [10]
  • Contact Setting: 50 (345) [3.5]
  • Dial: White on black, dual scale psi/kPa
  • Case: Plated steel
  • 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 Wire Leads: 18 AWG (1.0 mm2) x 12 in. (305 mm)
  • 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)

Product Condition: NEW
Murphy 75 PSI Differential Pressure Gauge in Plated Steel 2 inch/51 mm dial 20DP-75

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