Combination Indicating Gage and Limit Switch

• Critical Pressure Limit Switch Is Visible and Adjustable (Most Models)

• Switch Can Activate Alarms and/or Shutdown Equipment

• Exceeds SAE StandardsDescription

The 20 Series (2 inch/51 mm dial) and the 25 Series (2-1/2 inch/64 mm dial) SWICHGAGE® models are diaphragm-actuated, pressure-indicating gages, with built-in electrical switches. These switches are used for tripping alarms and/or shutdown devices. Ranges are available from 0-15 psi (103 kPa) [1.0bar] thru 0-400 psi (2.8 MPa) [28 bar].

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.

For models 20P and 25P, 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.

Models 20PE and 25PE have internal snap-acting SPDT switches.

Gage-only models, without the switches (MURPHYGAGE®) are also available.

Applications

The SWICHGAGE® was specifically designed to protect engines/equipment in Oil Field, Marine, Irrigation, Construction and Trucking applications to monitor Engine Lube Pressure, Water PumpPressure, Hydraulic Pressure, Air Pressure, etc.

Base Models

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 pre-alarm.20P7 and 25P7 Lockout SWICHGAGE® Same as 20P and 25P Series. They also include afront, semi-automatic lockout for startup override. This built-in device holds the pointer away from thecontact on startup. When pressure exceeds the setpoint, the lockout is automatically disengaged.

20PG and 25PG MURPHYGAGE®

Gage without contact(s).