To understand best what a shaft power monitor is, first you need to understand what shaft power is. Shaft power output refers to the number you get after calculating the motor input power (true power) minus the motor power loss. On the measuring device, the shaft power output will be indicated in kW, HP or as a percentage of rated power. The device measuring this output is called a shaft power monitor, and the Emotron M20 shaft power monitor is among the best ones on the market due to its many advantages and positive sides.

What is the Emotron M20 shaft power monitor and what is its main purpose?

The Emotron M20 is a shaft power monitor as its name clearly indicates. It serves for monitoring the work of pumps and other work equipment, and it prevents them from serious damage and process inefficiency. It works by sending early warnings for something that’s happening with the equipment and is about to cause serious problems, or simply by stopping whatever process the equipment is performing.

What are its main advantages?

• The Emotron M20 saves you money and time

Looking at the issue from the perspective of time and cost of repair after the damage is done, the Emotron M20 is your life-saver. Since the device sends you early signals about something that is wrong with the machines, you can take precautions. And if you simply miss the signal, or if the device is suited to work in that manner, it will stop the damaging process right on time. This means it will save you the repairs, waiting and paying a fortune for it.

• The process of shaft power monitoring is unique with the Emotron M20

As we explained before, the shaft power output is a result of the so called true power minus the motor power loss. The result you get with the Emotron M20 is the motor load value that’s linear and accurate across the whole load range, which gives far more reliable supervision than most non-linear methods.

• The device has a direct correlation to the pump curve

The pump sometimes can cavitate or run dry, and when that happens it can produce corresponding changes in motor load and shaft power. That’s where the shaft power monitor comes helpful; it detects the load change and immediately stops the pump. This way it prevents the pump from damaging.

Installation and maintenance

The Emotron M20 is installed in an easy, fast and cheap manner: together with the matched current transformers, the device is simply mounted next to the motor contactor in the electric control panel. Since the matched current transformer is directly connected to the monitor, external and additional transmitters are not necessary. Wiring is also minimized. Another huge advantage of the shaft power monitor is that it replaces the expensive and service demanding components like the sensors for flow, pressure and temperature, which means you do not need to drill holes to fit each component.