Control theory

Control theory

The basic elements present in the loop are a detector, a comparator and a regulator. All of which surround the process and form the loop.

A manual closed loop can be considered as a closed loop control system and the control action is dependent on the output. A detecting or meauring element will obtain a singal related to this output which is fed back to the transmitter. 

Form the transmitter the signal is then passed to a comparator. The comparator will contain some set or desired value of the controlled condition which is compared to the measured value signal.