September 2010

ISA Certified Control Systems Technician (CCST) program

Certified Control System Technicians (CCSTs) calibrate, document, troubleshoot, and repair/replace instrumentation for systems that measure and control level, temperature, pressure, flow, and other process variables.

CCST question

Which of the following symbols from ISA-5.1-2009 - Instrumentation Symbols and Identification is used to indicate a temperature regulator?

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CCST answer

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

Answer B is incorrect because the symbol represents a backpressure 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.

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