A direct-acting proportional-integral controller receives input from a direct-acting transmitter.
Which one of the following describes the response of the controller, operating in automatic mode, to an increase in the controlled parameter above the controller setpoint?
A. The controller will develop an output signal that continues to increase until the controlled parameter equals the controller setpoint, at which time the output signal stops increasing.
B. The controller will develop an output signal that will remain directly proportional to the difference between the controlled parameter and the controller setpoint.
C. The controller will develop an output signal that continues to increase until the controlled parameter equals the controller setpoint, at which time the output signal becomes zero.
D. The controller will develop an output signal that will remain directly proportional to the rate of change of the controlled parameter.
Show Answer
Answer: A
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