Seeking advice on instrument PID diagrams
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F represents flow rate. What do FE, FI, and FT in the diagram represent respectively? Does the flow meter in the diagram represent a double-flange flow meter?
E is the sensor, T is the transmitter, I is the display
FE3005 refers to the on-site flow sensor, FT3005 is the on-site flow transmitter, while FI3005 denotes the flow indication on the DCS.
FE-3005 in the diagram, namely the symbol on the pipe, specifically refers to an orifice plate. FT-3005 is a flow transmitter; the exact meaning of FI-3005 is to provide flow indication in the control room via the DCS.
Take a look at the functional indicators and graphic symbols for process measurement and control instruments in HG/T 20505-2014
FE stands for field instrument, T refers to transmission signal, and I indicates the signal
FE – Flow Element: the component used for measuring flow rate in a pipeline. FT – Flow Transmitter: device that converts the signals generated by the flow element into electrical signals, which are then transmitted to the system. FI – Flow Indication: the display within the control system. The legend in the diagram likely refers to a differential pressure flow meter
On-site display, transmission, DCS display
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