The Power Control Monitor is located in the pump control panel, either DIN rail or panel mounted.  This measures and monitors the true power absorbed by the pump. Many users of the first generation dry run monitors (which used to measure phase angle or current) had problems with nuisance trips, and difficulty in setting up.

The reason for this can be explained with reference to this diagram which shows the relationship of motor power and motor current with respect to motor load for a typical centrifugal pump. The motor current is almost constant up to 50% of the motor load and so is not a good measure at low pump flows.

The power curve however rises almost uniformly as the load increases, which means that settings are much easier and more reliable.

Motor Power can be accurately linked to the flow rate using the pump

This is repeatable and proven to work in hundreds of cases. A delay timer is provided so that nuisance trips can be avoided, for instance transient conditions or at start up.

One of the benefits of this device is that it is non intrusive - it does not come into contact with the pumped liquid so is especially suitable for hazardous liquids. There is no expensive mechanical work required - this alone can be more expensive than the unit itself. The unit will also prevent damage occurring because of closed valve operation and ensure that your pump will not operate outside its intended performance range.