The 20P Series (2 inch/51 mm dial) Switchgauge model is diaphragm activated, pressure indicating gauge, with a built-in switch. These switches are used for tripping alarms and/or shut-down devices.
The gauge pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have a self-cleaning motion to ensure electrical continuity.
The gauge 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.
Ranges available from 0-7 psi (45 kPa) thru 0-400 psi (2.8 MPa).

The A20P Series (2 inch/51 mm dial) Switchgauge model is diaphragm activated, pressure indicating gauge, with a built-in switch. These switches are used for tripping alarms and/or shutdown devices.
The gauge pointer acts as a pressure indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts have a self-cleaning motion to ensure electrical continuity.
These built-to-last instruments are face-sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel, and o-ring seals. Ranges above 30 psi (207 kPa) are totally sealed from the external environment.
Ranges available from 0-7 psi (45 kPa) thru 0-400 psi (2.8 MPa).

The 20T Series (2 inch/51 mm dial) Switchgauge model is diaphragm-actuated, temperature-indicating gauge, with built-in electrical switches for tripping alarms and/or shutdown devices.
These vapour actuated gauges feature a sealed capillary tube and a sensing bulb. When subjected to heat, the liquid in the sensing bulb changes to vapour creating pressure against the diaphragm mechanism. The diaphragm translates this vapour pressure into a mechanical gauge reading.
The gauge pointer acts as a temperature indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Contacts are grounded through the Swichgauge case. They have self-cleaning motion to enhance electrical continuity.
The gauge 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.
Ranges are available from 32-120°F (0-45C) thru 300-440F (160-220C).

The A20T Series (2 inch/51 mm dial) Switchgauge models are diaphragm-actuated, temperature-indicating gauges, with built-in electrical switches for tripping alarms and/or shutdown devices.
These vapour-actuated gauges feature a sealed capillary tube and a sensing bulb. When subjected to heat, the liquid in the sensing bulb changes to vapour creating pressure against a diaphragm mechanism. The diaphragm translates this vapour pressure into a mechanical gauge reading.
The gauge pointer acts as a temperature indicator and as one switch pole that completes a circuit when it touches the adjustable limit contact. Contact(s) are isolated from ground. They have self-cleaning motion to enhance electrical continuity.
All models of these rugged, built-to-last instruments are fully sealed from the environment by the unique combination of a polycarbonate case and lens, a polished stainless steel bezel, and O-ring seals.
Ranges are available from 32-120°F (0-45°C) thru 300-440°F (160-220°C).

Clamp, Globe & Globe holder kit to allow any TI, PI, A series, TEI, and PEI Murphy gauge to be Illuminated. Available only in 12 Volt. One kit per gauge is required.

Murphy 4-1/2 inch (114 mm) diameter dial pressure Switchgauge instruments accurately and reliably measure and indicate pressures in applications such as gas compressors control panels, pumping applications, industrial process applications, etc. The Switchgauge versions incorporate adjustable switch contacts which operate in unison with the indicating dial readout to operate alarms, shutdown or automation processes.
The OPL series is a flange mounting, indicating pressure gauge and switch. Adjustable high and low limit ungrounded contacts are used to operate alarm, shutdown or start-stop circuits. Pointer closure against either of the adjustable contacts completes the pilot-duty circuit. A SPDT toggle switch is provided to override the low limit contact for equipment start-up. Suitable for engines or electric motors with appropriate Murphy Magnetic Switch or Transformer Relay assembly.

Murphy 4-1/2 inch (114 mm) diameter dial pressure Switchgauge instruments accurately and reliably measure and indicate pressures in applications such as gas compressors control panels, pumping applications, industrial process applications, etc. The Switchgauge versions incorporate adjustable switch contacts which operate in unison with the indicating dial readout to operate alarms, shutdown or automation processes.
The 45PE series is a variation of our OPL series and has 2-SPDT snap-acting switches instead of the pointer type contacts of the OPL. Contacts are adjustable from the face of the 45PE. The 45PE is widely used for electric motor applications however can be used for engine applications.

The L150 series level Switchgauge is a combination liquid level gauge and low limit switch; each unit includes a chamber with pivotal float, an indicating dial with pointer, and a low level contact. When properly installed and maintained, the float operates the pointer that, in turn, both indicates level during normal operating, and closes a switching circuit if the level falls to the low-limit set point.

The EL150K1 series level Switchgauge is a combination liquid level gauge and low level microswitch; each unit includes a chamber with pivotal float, an indicating dial with pointer, and a low level contact. When properly installed and maintained, the float operates the pointer that, in turn, both indicates level during normal operating, and closes a switching circuit if the level falls to the low-limit set point.

The L129 Series Lube Level Switchgauge is a combination lube level indicating gauge and adjustable low and high limit switches. It provides protection against low oil level or high level caused by overfill or fuel or water seepage into the crankcase.
A 6-3/4 inch (171 mm) deep sight gauge allows you to check the condition and level of your oil without shutting down the equipment.
Fingertip-adjustable limit contacts, thru 4-7/8 inch (122 mm) range, make it simple to set high and low limit contacts. If the float touches the high or low limit contact, a normally open circuit will be completed which can activate alarms and/or shut down the equipment.

TATTLETALE® annunciators and Magnetic Switches are the nerve centres that translate Switchgauge contact operations into decisions and operate the alarm or shut down device. They are electrical load carrying devices for the alarm or shut down device. TATTLETALE® annunciators indicate which monitored function failed leading to the alarm or shutdown whereas magnetic switches do not. Magnetic switches operate basically as a latching relay.
117PH is use to shutdown 12V thru 32V distributor ignition or diesel engines. Breaks circuit when tripped. Opens distributor coil circuit or power circuit to diesel run device. Automatically disconnects from battery after trip.

TATTLETALE® annunciators and Magnetic Switches are the nerve centres that translate Switchgauge contact operations into decisions and operate the alarm or shut down device. They are electrical load carrying devices for the alarm or shut down device. TATTLETALE® annunciators indicate which monitored function failed leading to the alarm or shutdown whereas magnetic switches do not. Magnetic switches operate basically as a latching relay.
518APH allows for Switchgauge and/or N.C. contacts to be wired "Closed Loop" (in series). Any contact open or Switchgauge contact close in the circuit shunt trips the 518APH. Specify 12 or 24 VDC. Contacts 10 amps 24V. 14 amp fuse.

Murphy push/pull DC Solenoids provide single unit versatility for engine applications, such as shutdown.  Unlike most existing solenoids, this line features three-wire circuitry, which reduces the chance for burned up coils due to incomplete seating of the plunger.
If the plunger does not "seat" due to improper linkage adjustment, the solenoid coil will release the plunger.  This allows it to return to the "tripped" position, thus overcoming coil burnout. 
A choice of two models and two voltages is available.  All models come complete with return spring and rubber seal boot. 
Models RP2307 give a full one inch (25 mm) stroke at 11 pounds (49 N) and hold up to 23 pounds (102 N) at full voltage, continuous duty.  They will operate at any stroke less than maximum.

The SV-Series valve is a normally closed valve that opens when current is supplied from the battery through a magnetic switch.  Temperature, level, or pressure Switchgauge instruments installed on the engine and pump or compressor, trip the magnetic switch, breaking the circuit from the battery which closes the valve and stops the engine.
The standard SV-12 valve operates on 12 volts DC, has a 1/4 NPT inlet and outlet, and a full 3/16 in. (5 mm) orifice.  The standard SV valves open against 30 psi (207 kPa) [2.07 bar] inlet pressure.

The EGS21 Series Switch Gauge has all of the features of the EG21 Series Gauge plus an adjustable set point PowerHall Effect switch output for operating alarms or equipment shutdown.  The trip point is adjustable over 90% of the scale and has a set point indicator visible from the gauge face.  Now you can have both, the ease of electric gauge installation and the reliable switch of Murphy’s famous Switch Gauge.