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

According to ISA-5.1, the following P&ID symbol represents which kind of device?

A. Pitot tube
B. magnetic flowmeter
C. damper valve
D. constant flow regulator

CCST Answer

The correct answer is D, "constant flow regulator." The symbol for the constant flow regulator is a compound symbol made from the symbol for a variable area flowmeter (FICV) with an integral manual adjusting valve adjacent to a control valve symbol. The line above the two symbols indicates that the valve uses the flow signal to adjust the valve position, and hence, maintain a constant flow rate.

The symbols for the other three items are:


Intech CCST June img


Reference: Goettsche, L.D. (Editor), Maintenance of Instruments and Systems, Second Edition, ISA, 2005.


More Certification Review

CAP: How are the maintainability and maintenance of automation systems related
CCST: Using the parity system to detect transmission errors

CAP: The purpose of an industrial control system alarm system audit
CCST: What standard that defines quality policy and procedures

CAP: The mission of the Abnormal Situation Management® (ASM®) Consortium
CCST: What is the value of a resistor

CAP: Why ANSI/ISA-88.01-1995 (S88) treats control modules
CCST: Measuring current in a circuit

CAP: Output sinking configuration
CCST: Analog signal from a transmitter

CAP: The function of the rotor in an AC induction motor
CCST: Level measuring system

CAP: Processing of the PID algorithm
CCST: Providing a sample to extractive field analytical instruments

CAP: Definition of ALARM
CCST: Calibration instruments

See all Certification Review Articles

Reader Feedback

We want to hear from you! Please send us your comments and questions about this topic to