Murphy 0-20Hg Mechanical Vacuum Swichgage 2 in. with Plated Steel Case - 20V-20

The Murphy Swichgage 20Hg Mechanical Vacuum Gauge 20V-20 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.

FEATURES:

• 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

PRODUCT SPECIFICATIONS:

• Part No.: 20V-20
  
• Range: 0-20 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)

Note: Actual image not shown. Same style only.