AutoQuiz is edited by Joel Don, ISA’s social media community manager.

Today’s autoAutoQuiz03mation 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.

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
e) none of the above

ISA reference book: Maintenance of Instruments & Systems, 2nd Edition by L. D. Goettsche

Click Here to Reveal the 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.



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