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Murphy Vacuum Swichgage 20V-30

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Murphy 30Hg Mechanical Vacuum Swichgage 2 in. with Plated Steel Case - 20V-30

Product Condition: NEW
Murphy 30Hg Mechanical Vacuum Swichgage with Plated Steel Case 20V-30
Estimated ship date: for orders by 3pm PT/6pm ET today Available for back order.

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The Murphy Swichgage 30Hg Mechanical Vacuum Gauge 20V-30 is a diaphragm-actuated, vacuum-indicating gage with built-in electrical switch. This switch is used for tripping alarms and/or shutdown devices. The gage mechanism is enclosed in a steel case coated to resist corrosion. Features a polycarbonate, break-resistant lens and a polished, stainless steel bezel to help protect this rugged, built-to-last instrument. The gage pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have a self-cleaning motion to ensure electrical continuity.

Commonly used to measure loading of spark ignition engines through intake manifold vacuum.  Can serve as overspeed protection from sudden loss of load on the engine. Can be used anywhere the vacuum source is compatible with port materials. A pulsation dampener (PD2160) is included with each Swichgage to help eliminate pointer flutter.


  • 2 inch/51 mm dial
  • Combination Indicating Gage and Limit Switch
  • Monitor Engine Load
  • Switch Can Activate Alarms and/or Shutdown Equipment
  • Mechanism is enclosed in a steel case coated to resist corrosion



  • Part No.: 20V-30
  • Range: 0-30 inches of Hg
  • Dial: White on black, dual scale
  • Case (mounting clamp included): Plated steel
  • Bezel: Polished stainless steel
  • Lens: Polycarbonate, high-impact
  • Process Connection: 1/8-27 NPTM brass
  • Sensing Element: Beryllium copper diaphragm
  • Gage Accuracy: ±2% of scale in operating range (mid 1/3 of scale)
  • Adjustable Limit Contacts: 2-SPST contacts; pilot- duty only, 2 A @ 30 VAC/DC. Contacts are gold flashed silver
  • Limit Contact Adjustment: by a 1/16 in. hex wrench
  • Limit Contact Wire Leads: 18 AWG (1.0 mm2) x 12 in. (305 mm)
  • Unit Weight: 8 oz. (0.23 kg)
  • Unit Dimensions: 3 x 3 x 3 in. (76 x 76 x 76 mm)

Additional Information

Product Condition NEW
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