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Murphy 140-300°F Temperature Swichgage 30 Ft Capillary A20TE-OS-300-30-1/2

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Murphy 140-300F Mechanical Temperature Swichgage 2 in. with 30 Ft Capillary and Snap-Acting Switch - Oil Sealed - A20TE-OS-300-30-1/2

Product Condition: NEW
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy 140-300F Mechanical Temperature Swichgage 2 inch Oil Sealed with 30 Ft Capillary and Snap-Acting Switch A20TE-OS-300-30-1/2 is a diaphragm-actuated, temperature-indicating gage with built-in electrical switch for tripping alarms and/or shutdown devices. This rugged, built-to-last instrument is fully sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel, and O-ring seals. This vapor actuated gauge features 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. This A20TE-OS-300-30-1/2 also features an internal SPDT snap-switch, instead of the single pole/pointer contact(s). When the switch closes on rising temperature, it becomes Set. As temperature decreases the switch Resets.

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. Applications for A20 series temperature swichgage instruments include: engines and equipment in oil field, marine, irrigation, construction and trucking industries. Monitoring engine coolant temperature, crankcase oil and transmission oil.


  • 2 inch/51 mm dial
  • O-ring Seals
  • Polished Stainless Steel Bezel
  • Corrosion Resistant Polycarbonate Case
  • Indicating Gage and Limit Switch
  • Switch Can Activate Alarms and/or Shut Down Equipment
  • Contact(s) Isolated From Ground
  • OS = Oil sealed (Silicone Oil)
  • Internal Snap-Acting SPDT Switch



  • Part No.: A20TE-OS-300-30-1/2
  • Range: 140 – 300 (60 – 149)
  • Adapter Nut: 1/2-14 NPT
  • Dial: White on black
  • Case: Glass filled/Polycarbonate, corrosion-resistant; steel mounting clamp included
  • Bezel: Polished stainless steel
  • Pointer: Tempered nickel silver; red tip
  • Lens: Polycarbonate, high-impact.
  • Sensing Element: Beryllium copper diaphragm
  • Sensing Bulb: Copper
  • Capillary: PVC armored copper; 30 ft.
  • Sensing Bulb: Copper
  • Gage Accuracy: Temperature Range 140 to 300°F (60 to 149°C); Lower 1/3 of Scale ± 10°F (± 5.2°C); Middle 1/3 of Scale ± 6°F (± 3°C); Upper 1/3 of Scale ± 5°F (± 2.4°C)
  • Maximum Temperature: 340°F (173°C)
  • Standard Settings: 275°F (135°C)
  • Snap-Switch Rating: SPDT, 3 A@ 30 VDC inductive; 4 A @ 125 VAC inductive
  • Wiring: Number 4 screw terminals
  • Unit Weight: 11.9 oz. (0.370 kg)
  • Unit Dimensions: 4-3/4 x 4-3/4 x 3 in. (121 x 121 x 76 mm)

Additional Information

Product Condition NEW
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