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.
As used in instrumentation and defined in the ISA Dictionary, the term, "primary element" usually refers to:
A. outer cascade loop
B. pneumatic control valves
C. transmitters / transducers
D. process detectors or sensors