What Component Within a Control Loop Can Be Manipulated?

The post What Component Within a Control Loop Can Be Manipulated? first appeared on the ISA Interchange blog site.

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Today’s automation industry quiz question comes from ISA’s new course, Extreme Instrumentality: Electrical to Instrumentation Cross Training Boot Camp. The class, which is offered from September 29 to October 2, focuses on the knowledge and skill sets required to function as an instrument maintenance technician. Process measurement techniques, measurement and control equipment, calibrations techniques and calibration equipment will be discussed and utilized in numerous hands-on lab sessions. Knowledge gained from this course is designed to train you to be a key asset to an I&E maintenance team.

Discount Alert: ISA is offering a one-time only special for the Extreme Instrumentality course at 40% off regular pricing. This special is for the pilot course offering only.

Which variable does the control system attempt to hold at a constant value?

A) Final Control Element
B) Manipulated Variable
C) Controlled Variable
D) Disturbance
E) None of the above

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The diagram above illustrates the basic process control loop highlighting the components and measurements within the loop.

The correct answer is C.

Source: ISA News