Water must be at least 3.5 meters high, and the controller must fully close a valve when it reaches 3.9 meters and fully open it when it reaches 3.1 meters.
The output of the proportional controller is proportionate to the error signal. As a result, KP serves as the proportional controller's transfer function. The difference between the setpoint and the process variable, known as the error signal, determines the proportional control algorithm's controller output. In other words, a proportional controller's output is the result of multiplying the error signal by the proportional gain.
As a type of linear feedback controller system used in engineering and process control, proportional control applies a correction to the controlled variable whose size is proportional to the deviation between the desired value (setpoint, SP) and the measured value.
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