The Murphy 0-400 PSI Mechanical Pressure Swichgage Oil Sealed 2" with Internal Snap-Acting Switch A20PE-OS-400 is a diaphragm-actuated pressure-indicating gage with built-in electrical switch for tripping alarms and/or shutdown devices. This rugged, built-to-last instrument is face sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel and O-ring seals.
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. 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 self-cleaning motion to ensure electrical continuity.
The A20PE-OS-400 features internal snap-acting SPDT switch, instead of the single pole/pointer contacts. When the switch closes on falling pressure, it becomes Set, as pressure rises the switch Resets , for three wire control; can be wired to make or to break a circuit.
Applications includes: engines/equipment in Oil Field, Marine, Irrigation, Construction and Trucking Engines for Lube Oil Pressure, Water Pump Pressure, Hydraulic Pressure and Air Pressure.
- 2 inch/51 mm Dial
- Corrosion Resistant Polycarbonate Case
- Indicating Gage and Limit Switch
- Switch Can Activate Alarms and/or Shut Down Equipment
- Contact(s) Isolated From Ground
- Internal Snap-Acting SPDT Switch
- OS = Oil sealed (Silicone Oil)
- Part No.: A20PE-OS-400
- Range: 0-400 PSI (2.8 MPa) [28 bar]
- Maximum Pressure: 500 psi (3.4 MPa)
- Standard Settings: 150 psi (1.0 MPa) [10.0 bar]
- High Settings: 300 psi (2.1 MPa) [20 bar]
- Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa
- Case: Polycarbonate/glass filled, corrosion-resistant; steel mounting clamp included
- Bezel: Polished stainless steel
- Pointer: Tempered nickel silver; Red tip
- 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
- Snap-Switch Rating: SPDT, 3 A@ 30 VDC inductive; 4 A @ 125 VAC inductive
- Wiring: Number 4 screw terminals
- Unit Weight: 8 oz. (0.23 kg)
- Unit Dimensions: 3 x 3 x 3 in. (76 x 76 x 76 mm)