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Murphy 0-400 PSI Pressure Swichgage Oil Sealed A20P-OS-400

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Murphy 0-400 PSI Mechanical Pressure Swichgage 2 in. w/ Polycarbonate Case - Oil Sealed - A20P-OS-400

Product Condition: NEW
Murphy Mechanical Pressure Swichgage Oil Sealed 0-400 PSI with Polycarbonate Case A20P-OS-400
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

SSL Cerficate

The Murphy 0-400 PSI Mechanical Pressure Swichgage 2" Oil Sealed A20P-OS-400 is a diaphragm-actuated pressure-indicating gage with a built-in electrical switch for tripping alarms and/or shutdown devices. This rugged, built-to-last instrument is face sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel and O-ring seals.

Accuracy and protection from moderate overpressure is assured by a unique, unitized diaphragm chamber. A built-in pulsation dampener helps eliminate pointer flutter and is removable for cleaning. 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.

Applications includes: engines/equipment in Oil Field, Marine, Irrigation, Construction and Trucking Engines for Lube Oil Pressure, Water Pump Pressure, Hydraulic Pressure and Air Pressure.



  • 2 inch/51 mm dial
  • Corrosion Resistant Polycarbonate Case
  • Indicating Gage and Limit Switch
  • Switch Can Activate Alarms and/or Shut Down Equipment
  • Contact(s) Isolated From Ground
  • OS = Oil sealed (Silicone Oil)


  • Part No.: A20P-OS-400
  • Range: 0-400 PSI (2.8 MPa) [28 bar]
  • Maximum Pressure: 500 psi (3.4 MPa)
  • Standard Settings: 150 psi (1.0 MPa) [10.0 bar]
  • High Settings: 300 psi (2.1 MPa) [20 bar]
  • Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa
  • Case: Polycarbonate/glass filled, corrosion-resistant; steel mounting clamp included
  • Bezel: Polished stainless steel
  • Pointer: Tempered nickel silver; Red tip
  • Lens: Polycarbonate, high-impact
  • Oil: Silicon Oil
  • Temperature Range: Ambient: -40°F (-40°C) thru 150°F (66°C); Process: -40°F (-40°C) thru 250°F (121°C)
  • Process Connection: 1/8-27 NPTM brass
  • Sensing Element: Beryllium copper diaphragm
  • Adjustable Limit Contact: SPST contact; pilot-duty only, 2A@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 a 1/16 in. hex wrench thru 100% of the scale
  • Wiring: Number 4 screw terminals
  • Unit Weight: 8 oz. (0.23 kg)
  • Unit Dimensions: 3 x 3 x 3 in. (76 x 76 x 76 mm)

Additional Information

Product Condition NEW
upc No

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