• Murphy

Swichgage® & Murphygage® instruments

Swichgage instruments are high-quality diaphragm-actuated, dial gauges for various with built-in electrical switches.

These switches are used for tripping alarms and/or shutdown devices. The 20 and 25 series gauge mechanism is enclosed in a steel case coated to resist corrosion. A-Series gauges have a polycarbonate case and are sealed from the environment. All gauges feature a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect these rugged, built-to-last instruments. The pointer acts as both an 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. More compact, gauge-only models without contacts (known as Murphygage instruments) are also available.

20P / 25P series
A20P / A25P series
20T / 25T series
A20 / A25T series
20V / 25V / A20V / A25V series
20DP / 25DP / A20DP / A25DP series
B-Series Murphygage®
  • CE (European Conformity) mark
Specifications Downloads How to Order
Specifications Drawer: 

All models

  • Dial: White on black, dual USA/UK standard scale
    • Pressure & Vacuum models: U.S.A. standard scale is psi/kPa; U.K. standard scale is psi/bar
    • Temperature models: U.S.A. standard scale is dual scale °F/°C; others available
  • Case
    • 20 and 25 series: plated steel
    • A20 and A25 series: polycarbonate
  • Bezel: Polished stainless steel, standard; others available
  • Pointer: Tempered nickel silver
  • Lens: Polycarbonate, high-impact
  • Oil: Silicon oil
  • Ambient Temperature Range: -40°F (-40°C) thru 150°F (66°C)
  • Adjustable Limit Contact:
    • Pressure models: SPST contact; pilot-duty only, 2 A @ 30 VAC/DC; Normally Close (NC) when the low limit is met. Normally Open (NO) when pointer is in normal operating range. Contacts are gold flashed silver.
    • Temperature models: SPST contact; pilot-duty only, 2 A @ 30 VAC/DC; closed when the high 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.
  • Limit Contact Wire Leads: 18 AWG (1.0 mm2) x 12 in. (305 mm)
  • Limit Contact Terminals:
    • A20 series: #4 screw terminals
    • A25 series: #6 screw terminals
  • Snap-Switch Rating (20PE/25PE/20TE/25TE models): SPDT, 3 A @ 30 VDC inductive; 4 A @ 125 VAC inductive
  • Snap-Switch Wire Leads (20PE/25PE/20TE/25TE models): 20 AWG (0.75 mm2) x 12 in. (305 mm)  
  • Unit Weight and Dimensions: See sales bulletin

Pressure and Vaccuum models

  • Sensing Element: Beryllium copper diaphragm.
  • Process Connection: 1/8-27 NPTM brass.
  • ​​​Gage Accuracy:
    • 20P/25P/A20P/A25P: see sales bulletin
    • B-Series models: see sales bulletin
    • Vacuum & differential pressure models: ±2% of scale in operating range (mid 1/3 of scale)
  • Maximum Pressure: See sales bulletin

Temperature models

  • Sensing Bulb*: Copper
  • Capillary*: PVC armored copper; 4 ft. (1.2 m). Stainless steel armor optional
  • Gage Accuracy:
    • 20T/25T/A20T/A25T: see sales bulletin
    • B-Series models: see sales bulletin
  • Maximum Temperature: See sales bulletin

*For optional capillary lengths, engine adapters, sensing bulbs and range combinations, see bulletin 8428.

Literature Drawer: 

Additional product documentation can be found on our product support website or by clicking the Help Center button above.

Primary Method - Table: 
Part NumberModel/DescriptionNotes