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B.T.S FEE [D. Bord lycée St Michel – 54] sem 12 Process Control & Instrumentation part III P&I symbols Page 1/3 Instrument symbols Humidity transmitters: Pressure limiters symbols PZHH : Safety pressure Cut out for high pressure protection with manual reset PZH : Safety pressure Cut out for high pressure protection with external reset PSL : Pressure safety low PSH: Pressure safety High

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  • B.T.S FEE [D. Bord lyce St Michel 54] sem 12

    Process Control & Instrumentation part III P&I symbols

    Page 1/3

    Instrument symbols

    Humidity transmitters: Pressure limiters symbols PZHH : Safety pressure Cut out for high pressure protection with manual reset PZH : Safety pressure Cut out for high pressure protection with external reset PSL : Pressure safety low PSH: Pressure safety High

  • B.T.S FEE [D. Bord lyce St Michel 54] sem 12

    Process Control & Instrumentation part III P&I symbols

    Page 2/3

    Hydraulic circuit example : Complete the schematic diagram by representing:

    Two pressostats :

    o Low pressure switch for safety

    o High pressure switch for control, with manual reset.

    Two manometers

    A on/off thermostat for temperature control

    Complete the schematic diagram by representing:

    FCP

  • B.T.S FEE [D. Bord lyce St Michel 54] sem 12

    Process Control & Instrumentation part III P&I symbols

    Page 3/3

    Volume flow rate measurement chain using a differential pressure transmitter

    Supply temperature measurement chain using a transmitter

    A variable frequency drive which modulates the fan rotation speed.

    Volume flow rate