Chemical process instrument tag number
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What do specific terms such as Chemical Instrument I for indication, R for recording, Q for accumulation, and C for control mean? What’s the difference between PI and PG? Experts, please share your insights
After some searching, I finally figured it out{:1_90:}
Take a look at the functional indicators and graphic symbols for process measurement and control instruments in HG/T 20505-2014
PI for remote pressure display, PG for local pressure gauge