05704340 – Murphy Pressure Swichgage – Model A25P-300


A25P-300: 2″ Pressure Swichgage; Polycarbonate Case; 0-300 Psi (05704340)

The A25 Series (2-1/2 inch/64 mm dial) SWICHGAGE® models are diaphragm-actuated, pressure-indicating gages, with built-in electrical switches for tripping alarms and/or shutdown devices. All models of these rugged, built-to-last instruments are face sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless-steel bezel and O-ring seals. Ranges above 30 psi (207 kPa) [2 bar] are totally sealed from the external environment. 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. For series A25P, 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. A25 Series applications include: engines/equipment in Oil Field, Marine, Irrigation, Construction and Trucking Engines for Lube Oil Pressure, Water Pump Pressure, Hydraulic Pressure, Air Pressure, etc.

Estimate available in 28 working days from Italy to Italy.

This product may vary on delivery times, as factories do not guarantee production due to lack of raw materials.

Availability: Available on backorder SKU: 05704340 Categories: , Tags: ,


Product Specifications:

  • Dial: White on black, dual USA/UK standard scale (U.S.A. standard scale is psi/kPa; U.K. standard scale is psi/bar)
  • Case: Polycarbonate/glass filled, corrosion-resistant; steel mounting clamp included
  • Bezel: Polished stainless steel, standard; others available
  • Pointer: Tempered nickel silver; red tip
  • Lens: Polycarbonate, high impact
  • Oil: Silicon oil
  • Temperature Range:
    • Ambient: -40° to 150° F (-40° to 66° C)
    • Process: -40° to 250° F (-40° to 121° C)
  • Process Connection: 1/8-27 NPTM brass.
  • Sensing Element: Beryllium copper diaphragm.
  • Gage Accuracy: ±3% maximum across scale
  • Adjustable Limit Contact (A20P and A25P): SPST contact; pilot-duty only, 2A@30 VAC/DC; Closed when the low limit is met, open when pointer is in normal operating range
  • Limit Contact Adjustment: by 1/16 in. hex wrench through 100% of the scale.
  • Wiring: A25P: Number 6 screw terminals
  • Unit Weight: A25 Series Models: 11 oz. 0.31 kg.
  • Unit Dimensions: A25 Series models: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm).


A25P murphy dimension

Pressure ranges and factory settings

a25p murphy pressure range

Typical internal wiring diagrams

a25p murphy diagrams

How to order:

  • Part Numbeer: 05704340
  • Base Model: A25P
  • Dual Scale (psi/kPa): 0-300 psi, 0-2.07 kPa

Additional information

Weight0,31 kg


05704340, A25P-300