The Top Five Most Underrated Process Monitoring Instruments

The Murphy brand built its 82-year reputation providing quality process monitoring instruments for diesel, electric and mechanical engines. Enovation Controls still provides a complete line of Murphy instruments for monitoring pressure, temperature, liquid level, overspeed, time and vibration that are popular with customers around globe. They may not be as new and exciting as uControl™ mobile machine controllers, but these instruments are essential for mechanical engine applications. We talked with long-time Murphy sales manager Paul Kasishke to get his top 5 most underrated process monitoring instruments.

#5 - EL150 Level Swichgage®

The EL150 is a classic level switch option and has a variety of engine monitoring purposes. The primary use of the L150/EL150K1 is for engine cooling systems, surge or expansion tanks, condenser radiator or vapor phase systems, pressurized or atmospheric systems. This level Swichgage instrument can also be used to monitor lube oil, hydraulic fluid or diesel fuel reservoirs and activates alarms and/or shut down at a predetermined minimum level.

Paul says: “The EL150 Series Level Swichgage is used on mechanical diesel or spark ignited engines in dewatering, irrigation, sewage lift stations, and power generation oil and gas applications as well. This Swichgage is perfect for any engine that needs fluid level monitoring.”


#4 – TATTLETALE® Annunciators

Our tattletale annunciators indicate when a monitored function of a mechanical engine fails and tells you the specific function that failed and leads to an alarm or shutdown. Our annunciators can make a huge difference in protecting your engine to alert you of issues with your engine to ensure safety for your equipment and the operator.

Paul says: “Our tattletale annunciators are used on mechanical, diesel or spark ignited engines in dewatering, irrigation, sewage lift stations, power generation oil and gas applications as well. Our annunciators can be used on any engine or application that requires a higher current contact to open cause a shutdown.”


#3 - AT03069 Throttle Controller

The AT03069 is developed specifically to automatically control engine speed to meet system demand. This device saves you on fuel, engine wear, horsepower and labor all in one.

Paul says: “The AT03069 is usually used on mechanical, diesel or spark ignited engines in dewatering, irrigation, sewage lift stations, power generation and oil and gas applications that need a way to manually or automatically throttle the engine.”


#2 - PSB and TSB

The PSB switch is a direct-mount switch for critical pressure points. It has one limit contact that can be used to activate an alarm, actuate indicator lights or shutdown equipment. Like the PSB switch, but responsible for monitoring temperature, the TSB switch is a direct-mount switch for temperature sensing. It has one limit contact that can be used to activate an alarm, actuate indicator lights or shut down equipment.

Paul says: “These switches can be used on mechanical or electronic, diesel or spark ignited engines in dewatering, irrigation, sewage lift stations, power generation oil and gas applications as well. Any engine that needs pressure or temperature warnings or shutdown without the gauge dial to view the range of the parameter.”


#1 – Mechanical Swichgage® and Murphygage® Instruments

Our mechanical Swichgage and Murphygage instruments offer process monitoring for temperature, pressure, differential pressure and vacuum pressure. Swichgage instruments are high-quality diaphragm-actuated, dial gauges with built-in electrical switches. Used for tripping alarms and/or shutdown devices, the pointer acts as both an indicator and as one switch pole which completes a circuit when it touches the adjustable limit contact. Compact, gauge-only models without contacts (known as Murphygage instruments) are also available. Murphy gauges are easy-to-read, easy-to-install and work-tested and operator-approved.

Paul says: “Gauges are the most underrated item for any mechanical engine system. Our gauges feature a process connection and port as well as a diaphragm chamber machined from brass and not part of the case. The adjustable limit contact allows easy configuration to your application’s requirements.”

Not sure if you need gauges or a display? Click here for guide to choosing what’s right for your application.


Click here to find a local distributor who stocks these and other Murphy instruments