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