Murphy 0-75 PSI Mechanical Pressure Swichgage w/ Semi-Automatic Lockout - 20P7-75

The Murphy 0-75 PSI Mechanical Pressure Swichgage with Semi-Automatic Lockout 20P7-75 is a diaphragm-actuated, pressure-indicating gage with a built-in electrical switch. This swichgage is used for tripping alarms and/or shutdown devices. 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. Accuracy and protection from moderate overpressure is assured by a unique, unitized diaphragm chamber. A built-in pulsation dampener helps eliminate pointer flutter and is removable for cleaning. This unit includes a front, semi-automatic lockout for startup override. This built-in device holds the pointer away from the contact on startup. When pressure exceeds the set point, the lockout is automatically disengaged.

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 are grounded through the Swichgage case and have self-cleaning motion to ensure electrical continuity. The gage pointer makes with an adjustable contact to complete a pilot-duty circuit. Specifically designed to protect engines/equipment in Oil Field, Marine, Irrigation, Construction and Trucking applications to monitor engine lube pressure, water pump pressure, hydraulic pressure and air pressure.

FEATURES:

• 2 inch/51 mm dial
• Combination Indicating Gage and Limit Switch
• Switch Can Activate Alarms and/or Shutdown Equipment
• Exceeds SAE Standards
• Semi-Automatic Lockout

PRODUCT SPECIFICATIONS:

• Part No.: 20P7-75
• Range: 0-75 psi (0-517 kPa)
  
• Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa
• Case: Plated steel; mounting clamp included (except for direct mount models)
• Bezel: Polished stainless steel
• Lens: Polycarbonate, high-impact
• Oil: Silicon Oil
• Temperature Range: Ambient: -40°F (-40°C) thru 150°F (66°C); Process: -40°F (-40°C) thru 250°F (121°C)
• Process Connection: 1/8-27 NPTM brass
• Sensing Element: Beryllium copper diaphragm
• Adjustable Limit Contact: SPST contact; pilot- duty only, 2 A @ 30 VAC/DC; Normally Close (NC) when the low 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 thru 100% of the scale
• Limit Contact Wire Leads: 18 AWG (1.0 mm2) x 12 in. (305 mm)
• Unit Weight: 8 oz. (0.23 kg)
• Unit Dimensions: x 3 x 3 in. (76 x 76 x 76 mm)