Explain how to carryout a field zero check on a pressure transmitter?

  • If the transmitter signal is used for controlling, then put the controller on manual.

  • Connect a digital multimeter in the current range in series with the transmitter output.

  • Isolate the process valve

  • Isolate the instrument isolation valve.

  • Open the equalising valve

  • Open the bleed valve and de-pressurise the transmitter.

  • Check for 4.00mA output signal, if not, adjust the zero screw.