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 measurement methods is most cost effective for measuring the level of a highly corrosive media?

A. radioactive
B. ultrasonic
C. capacitance
D. float

CCST Answer

The correct answer is B, “ultrasonic.” The ultrasonic method is the most cost effective. Floats are very seldom used with any corrosive material, and radioactive measurement is very expensive, due to purchase costs and compliance with federal and state regulations. Capacitance can be adapted to work with a highly corrosive media, but it will not be as cost effective as ultrasonic measurement.

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