• 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
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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.

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