ISA Certified Automation Professional (CAP) program

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Certified Automation Professionals (CAPs) are responsible for the direction, design, and deployment of systems and equipment for manufacturing and control systems.

CAP question

In the first order process with dead time model (FOPDT), the process gain Kp is defined as:

CAP May/Jun fig 1

CAP Answer

The correct answer is D, Kp = change in process variable (in percent of range)/change in controller output in (in percent of range).

The process gain indicates the relative change in process variable (PV) that results from the response to a change in the controller output (CO). Both PV and CO are expressed in percent of range to ensure the calculation is not dependent on the engineering units chosen.

Reference: Trevathan, Vernon L., A Guide to the Automation Body of Knowledge, Second Edition, ISA, 2006.


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