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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