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An instrument bubble tagged for pressure transmission.
Also known as: PT instrument symbol, Pressure measurement transmitter
On a piping and instrumentation diagram a bubble tagged PT denotes a pressure transmitter, measuring pressure at a point and sending the value to the control system.
Denotes an instrument measuring pressure and transmitting the value as a signal.
Contexts: Technical drawing
Is distinct from the pressure gauge the catalogue already holds, which indicates locally and transmits nothing.
Contexts: Technical drawing
An instrument circle containing the letters P and T above a loop number, connected to the process line.