- CCST
Summary
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. For more information, visit the CCST webpage.
CCST question
Proportional band and reset are ________ of each other for tuning purposes.
A. inverseB. additive
C. subtractive
D. compound
CSST answer
The answer is A, “inverse.”
We know that gain and integral (reset) action work to change the final control element output in the same direction in response to an error signal. But proportional band = 100/Gain. That makes proportional band and integral (reset) action work in opposite directions, or inversely to one another, in response to an error.
Reference: Goettsche, L. D. (Editor), Maintenance of Instruments and Systems, Second Edition, ISA, 2005.
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