Murphy 2-1/2 in. Mechanical Pressure Swichgage 100 PSI with Internal SPDT Snap-Switch for Pre-Alarm - A25PABS-100

The Murphy Pressure Swichgage A25PABS-100 features a standard limit contact for equipment shutdown on low pressure. They also have an internal SPDT snap-switch to signal an alarm before shutting down. When the snap-switch trips (preset point) on falling pressure, the switch completes a circuit to activate an alarm. If the pressure continues to fall, the face-adjustable pointer contact will make and the shutdown circuit will be completed (see the typical diagram Image 3 for reference). The front contact shutdown limit setting (which is adjustable) and the snap-switch are preset at the factory. 

It is a diaphragm-actuated, pressure-indicating gage with built-in electrical switches 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 seal. 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. A25 Series applications include: engines/equipment in oil field, marine, irrigation, construction and trucking for lube oil pressure, water pump pressure, hydraulic pressure, air pressure, etc.

PRODUCT FEATURES:

• 2-1/2 inch/64 mm dial
• The gage pointer makes with an adjustable contact to complete a pilot duty circuit
• Internal SPDT snap-switch for pre-alarm
• Sealed from the external environment

PRODUCT SPECIFICATIONS:

• Murphy Part No.: A25PABS-100
• Series: A25 Series
• Base Model: A25PABS
• Range: 0-100 psi (0-689 kPa) [7.0 bar]
• Dial: White on black, dual scale; U.S.A. standard scale is psi/kPa
• Case: Polycarbonate/glass filled, corrosion-resistant
• Bezel: Polished stainless steel, standard
• Pointer: Tempered nickel silver; Red tip
• Lens: Polycarbonate, high-impact
• Temperature Range:

• Ambient: -40° to 150°F (-40° to 66°C)
• Process: -40° to 250°F (-40° to 121°C)

• Process Connection: 1/8-27 NPTM brass
• Sensing Element: Beryllium copper diaphragm
• Gage Accuracy (% of Full Scale): 

• Lower 1/4: ±3%
• Middle 1/2: ±2%
• Upper 1/4: ±3%

• Maximum Pressure: 200 psi (1.4 MPa)
• Standard Setting: 20 psi (138 kPa) [1.5 bar]
• Low Setting: 20 psi (138 kPa) [1.0 bar]
• Alarm Setting: 23 psi (159 kPa) [1.5 bar]
• Adjustable Limit Contact: SPST contact; pilot-duty only, 2A@30 VAC/DC; Closed when the low limit is met. Open 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.
• Snap-Switch Rating: SPDT, 3 A@ 30 VDC inductive; 4 A @ 125 VAC inductive
• Wiring: Number 6 screw terminals
• Unit Weight: 11 oz. (0.31 kg)
• Unit Dimensions: 4-3/4 x 4-3/4 x 2-3/4 in. (121 x 121 x 70 mm)