Temperature Gauges
Temperature Gauges


  • Corrosion resistant polycarbonate case
  • Indicating gage and limit switch
  • Switch can activate alarms and/or shut down equipment
  • Critical/high temperature limit switch is visible and adjustable (Most models)
  • Contact(s) isolated from ground



The A20 Series and the A25 Series SWICHGAGE® models are diaphragm-actuated, temperature-indicating gages, with built-in electrical switches for tripping alarms and/or shutdown devices. Ranges are available from 32-120°F thru 300-440°F. All models of these rugged, built-to-last instruments are fully sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel, and O-ring seals. These vapor/pressure actuated gages feature a sealed capillary tube and a sensing bulb. When subjected to heat, the liquid in the sensing bulb changes to vapor creating pressure against a diaphragm mechanism. The diaphragm translates this vapor pressure into a mechanical gage reading. For series A20T and A25T, the gage pointer acts as a temperature indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contact(s) are isolated from ground. They have self-cleaning motion to enhance electrical continuity. Models A20TE and A25TE have internal snap-acting SPDT switches. Gage-only models, without contacts (MURPHYGAGE®) are also available.



Applications for A20 and A25 Series temperature SWICHGAGE® instruments include: engines and equipment in Oil Field, Marine, Irrigation, Construction and Trucking industries. Monitoring Engine Coolant temperature, Crankcase Oil, Transmission Oil.

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