P&ID Tag Numbers

  • The first letter indicates the types of process variables the instrument is used for.

  • P = Pressure
    T = Temperature
    F = Flow
    L = Level

    • .

  • When a symbol contains two letters, the second letter indicates the function of the instrument.

  • R = Recording
    C = Controlling
    T = Transmit

    • This functional identifier represents a temperature transmitter.

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