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AutoQuiz: Characteristics of a Loop Diagram

AutoQuiz is edited by Joel Don, ISA's social media community manager.

This automation industry quiz question comes from the ISA Certified Control Systems Technician (CCST) program. Certified Control System Technicians calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables. Click this link for more information about the CCST program.

Which of the following is most typical regarding loop diagrams?

a) they are relatively inexpensive to produce
b) they are produced on an as-needed basis after the plant is running
c) they show both the minimum and optional items that are required
d) they are typically developed by a company's engineering staff
e) none of the above

Some plant owners do not believe that loop diagrams are worth their cost (which can be considerable), and they are not typically included in a design package. Therefore, the diagrams are often included on an as-needed basis after the plant is running.

The correct answer is B, “They are produced on an as-needed basis after the plant is running.”

Reference: Goettsche, L.D. (Editor), Maintenance of Instruments and Systems, 2nd Edition

About the Editor
Joel Don is the community manager for ISA and is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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Image Credit: Instrumentation Tools

Joel Don
Joel Don
Joel Don is an independent content marketing, social media and public relations consultant. Prior to his work in marketing and PR, Joel served as an editor for regional newspapers and national magazines throughout the U.S. He earned a master's degree from the Medill School at Northwestern University with a focus on science, engineering and biomedical marketing communications, and a bachelor of science degree from UC San Diego.

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