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Today's automation 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. Click this link for more information about the CCST program.
Fluid at a specific gravity of 1.0 exerts .43 psi per foot of level. The fluid in this tank, at a specific gravity of 1.2, will exert .52 psi per foot of level. The bubbler tube has been offset 1 foot off of the bottom of the tank, therefore, it is only measuring 13 of the overall 14 feet. 13 ft × .52 psi/ft = 6.8 psi