The 20 Series (2 inch/51 mm dial) and the 25 Series (2-1/2 inch/64 mm dial) Swichgage models are diaphragm-actuated, temperature-indicating gages with built-in electrical switches for tripping alarms and/or shut-down devices.

Ranges are available from 32°-120°F (0°-45°C) through 300°-440°F (160°-220°C).
The gage mechanism is enclosed in a steel case coated to resist corrosion. A polycarbonate, break- resistant lens and a polished, stainless steel bezel help protect this rugged, built-to-last instrument.
These vapor-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 the diaphragm mechanism. The diaphragm translates this vapor pressure into a mechanical gage reading.

For series 20T and 25T, 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 grounded through the Swichgage case. They have a self-cleaning motion to enhance electrical continuity.
These instruments are used on equipment in oil field and monitoring engine coolant, crankcase oil and transmission oil.

• Dial: White on black; U.S.A. standard scale is dual scale °F/°C; others available (see How to Order)
• Case: Plated steel; mounting clamp included (except direct mount models)
• Bezel: Polished stainless steel, standard; others available (see How to Order)
• Pointer: Tempered nickel silver
• Lens: Polycarbonate, high-impact
• Sensing Element: Beryllium copper diaphragm
• Capillary: PVC armored copper; 4 ft. (1.2 m). Stainless steel armor optional
• Sensing Bulb: Copper*
• Gage Accuracy: See Temperature Accuracy Chart
• Maximum Temperature: See Temperature Ranges and Factory Settings Table
• Maximum Ambient Temperature: -40°F (-40°C) through 150°F (66°C)
• Adjustable Limit Contact (20T and 25T): SPST contact; pilot duty only, 2 A @ 30 VAC/ VDC; Ground path through encasement. Normally Closed (NC) when the high limit is met. Normally Open (NO) when pointer is in normal operating range. Contacts are gold flashed silver.
• Limit Contact Adjustment: By a 1/16 in. hex wrench through 100% of the scale
• Limit Contact Wire Leads: 18 AWG (1.0 mm) 2 x 12 in. (305 mm)
• Snap-Switch Wire Leads: 20 AWG (0.75 mm2) x 12 in. (305 mm)
• Unit Weight: 20 Series: 12.7 oz. (0.39 kg); 25 Series Models: 13.8 oz. (0.43 kg)
• Unit Dimensions:
• 20 Series: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)
• 25 Series Models: 4-3/4 x 4-3/4 x 3 in. (121 x 121 x 76 mm).