05704334 – Murphy Pressure Swichgage – Model A25P-30


A25P-30: 2.5″ Pressure Swichgage®; 0-30 Psi  (05704334)

The A25P-30 Pressure Swichgage® is a 2.5″ (64 mm) dial, diaphragm-actuated pressure-indicating gage with a built-in electrical limit switch, which is used for tripping alarms and/or shutdown devices. This dual-scale instrument has a range of 0-30 psi. The gage mechanism is enclosed in a polycarbonate, break-resistant case and lens. A polished stainless-
steel bezel and O-ring seals help protect this rugged instrument 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. Inside the A25P-30, the tempered nickel silver 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 a self-cleaning motion to ensure electrical continuity.
The A25P-30 Pressure Swichgage® was specifically designed to protect engines and equipment in oil field, marine, irrigation, construction and trucking applications by monitoring engine lube pressure, water pump pressure, hydraulic pressure and air pressure. This popular instrument features a beryllium copper diaphragm sensing element and a 1/8-27 NPTM brass process connection. The adjustable limit contact is an SPDT contact; pilot-duty only, 2A @ 30 VAC/DC; closed when the low limit is met, and open when the pointer is in normal operating range.

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: 05704334 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: 05704334
  • Base Model: A25P
  • Dual Scale (psi/kPa): 0-30 psi, 0-207 kPa

Additional information

Weight0,31 kg


05704334, A25P-30