Murphy by Enovation Controls
A20 / A25P SERIES PRESSURE SWICHGAGE
The A20 Series (2 inch/51 mm dial) and the A25 Series (2-1/2 inch/64 mm dial) Swichgage models are diaphragm-actuated, temperature-indicating gages, with built-in electrical switches for tripping alarms and/ or shutdown devices. Ranges are available from 32°-120° F (0°-45° C) through 300°-440° F (160°-220° C).
Swichgage® instruments are built in the USA and have protected engines and equipment in applications such as oil and gas, marine, irrigation, construction and trucking applications to monitor engine coolant, crankcase oil, transmission oil and others for more than 80 years.
20P and 25P Series Swichgage
The gage pointer makes with an adjustable contact to complete a pilot-duty circuit.
20PE and 25PE Swichgage 20PE (was 20EO) and 25PE (was 25EO)
Features internal snap-acting SPDT switches, instead of the single pole/pointer contacts. When the switch closes on falling pressure, it becomes set, as pressure rises the switch resets.
20PABS and 25PABS Swichgage
Same as 20P and 25P with internal SPDT snap-switch for prealarm.
20P7 and 25P7 Lockout Swichgage
Same as 20P and 25P Series. They also include 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 (see bulletin in downloads for details).
20PG and 25PG MurphyGage
Gage without contact(s)
- Dial: White on black, dual USA/UK standard scale (U.S.A. standard scale is psi/kPa; U.K. standard scale is psi/bar)
- Case: Polycarbonate/glass filled, corrosion-resistant; steel mounting clamp included
- Bezel: Polished stainless steel, standard; others available
- Lens: Polycarbonate, high-impact
- Pointer: Tempered nickel silver
- Oil: Silicon oil
- Ambient Temperature Range: -40°F (-40°C) thru 150°F (66°C)
- Process Connection: 1/8-27 NPTM brass.
- Sensing Element: Beryllium copper diaphragm.
- Gage Accuracy: See bulletin in downloads
- Maximum Pressure: See bulletin in downloads
- Adjustable Limit Contact (A20P and A25P): 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.
- Wiring: A20P: Number 4 screw terminals; A25P: Number 6 screw terminals
- Snap-Switch Rating SPDT, 3 A@ 30 VDC inductive; 4 A @ 125 VAC inductive
- Wiring: A20PE: Number 4 screw terminals; A25PE: Number 6 screw terminals
- Unit Weight: A20 Series: 8 oz. (0.23 kg); A25 Series Models: 11 oz. (0.31 kg).
- Unit Dimensions: A20 Series: 8 oz. (0.23 kg); A25 Series Models: 11 oz. (0.31 kg).
WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information about California Propsition 65, go to www.P65Warnings.ca.gov or visit our California Proposition 65 page.
A20 / A25P Series Technical Sales Bulletin (94030)
Includes:
Dimension Diagrams
Pressure Ranges and Factory Settings
Features of the A20 / A25 Series
Using A20 / A25 Series instruments with a Magnetic Switch
Pre-Alarm Using A20/A25PABS
Typical Internal Wiring Diagrams
| Part Number | Description | Notes |
|---|---|---|
| 05702176 | A20 Series Clamp Lite Assembly; 12V | Illumination — Order Separately |
| 05702177 | A20 Series Clamp Lite Assembly; 24V | Illumination — Order Separately |