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.
In a bubbler (dip tube) level measuring system, for a bubble to be emitted at the open end of the purge pipe, the air pressure at that point is _______ the pressure exerted by the liquid at that point.
B. equal to
C. less than
D. three times