A controller is:
A) a device used to record process variables.
B) a device used to measure physical and chemical compositions.
C) a device designed to alert operators when a process variable exceeds established parameters.
D) a device used to initiate change when a process variable moves out of established guidelines.

Question

Quizplus · Accepted Answer

A controller is a device used to initiate change when a process variable moves out of established guidelines, maintaining the desired setpoint by adjusting inputs.

A Controller Is