Murphy 2 in. Mechanical Temperature Swichgage 130-250F with Light Pipe Illumination 12VDC and 8 ft. PVC Armor Capillary - 20T-IP1-250-8


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0.91 LBS
Estimated Special Order Ship Date:
Approximately 3 - 4 Weeks
Special Order Available:
Increments of 1

The Murphy Temperature Swichgage 20T-IP1-250-8 is a diaphragm-actuated, temperature-indicating gage with built-in electrical switch for tripping alarm and/or shut-down device. 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.

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. This vapor-actuated gage 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. This instrument is used on industrial engines and equipment in oil field, marine, irrigation, construction and trucking industries and for monitoring engine coolant, crankcase oil and transmission oil.


  • Murphy Part No.: 20T-IP1-250-8
  • Series: 20T Series
  • Option: Light Pipe Illumination, 12 VDC
  • Range: 130-250°F (54-121°C)
  • Capillary Armor Type: PVC Armor, Copper Capillary
  • Capillary Length: 8 ft.
  • Adapter Nut: 1/2-14 NPT
  • Dial Diameter: 2 in. (51 mm)
  • Dial: White on black; U.S.A. standard scale is dual scale °F/°C
  • Case: Plated steel; mounting clamp included (except direct mount models)
  • Bezel: Polished stainless steel, standard
  • Pointer: Tempered nickel silver
  • Lens: Polycarbonate, high-impact
  • Sensing Element: Beryllium copper diaphragm
  • Sensing Bulb: Copper
  • Lower 1/3 of Scale Gage Accuracy: ± 9°F (± 5°C) 
  • Middle 1/3 of Scale Gage Accuracy: ± 5°F (± 2.4°C)
  • Upper 1/3 of Scale Gage Accuracy: ± 4°F (± 2°C)
  • Maximum Temperature: 310°F (154°C)
  • Standard Setting: 210°F (99°C) 
  • Low Setting: 160°F (71°C) 
  • High Setting: 210°F (99°C) 
  • Maximum Ambient Temperature: -40°F (-40°C) through 150°F (66°C)
  • Adjustable Limit Contact: 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: 12.7 oz. (0.39 kg)
  • Unit Dimension: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)

Product Condition: NEW

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