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.

In the post image, which symbol from ISA-5.1-2009 – Instrumentation Symbols and Identification is used to indicate a temperature regulator?

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Answer B is incorrect because the symbol represents a back pressure regulator, external pressure tap.

Answer C is incorrect because the symbol represents a pressure reducing regulator, external pressure tap.

Answer D is incorrect because the symbol does not exist in ISA-5.1-2009.

The correct answer is A; this symbol reflects a temperature regulator, filled thermal system.

Reference: ANSI/ISA-5.1-2009 – Instrumentation Symbols and Identification

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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