• Contact 'grounds' through case

The 20 Series (2 inch/51 mm dial) Switch gauge models are diaphragm-actuated, temperature-indicating gauges, with built-in electrical switches for tripping alarms and/or shutdown devices.

The gauge mechanism is enclosed in a steel case coated to resist corrosion. A poly carbonate, break-resistant lens and a polished, stainless steel bezel help protect this rugged, built-to-last instrument.

These vapor actuated gauges 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 the diaphragm mechanism. The diaphragm translates this vapor pressure into a mechanical gauge reading.

For series 20T the gauge 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 grounded through the Switch gauge case. They have self-cleaning motion to enhance electrical continuity.

Industrial engines and equipment in Oil Field, Marine, Irrigation, Construction and Trucking industries. Monitoring Engine Coolant, Crankcase Oil, Transmission Oil.