How to carryout a field zero check on a pressure transmitter


#1
  • 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 equalizing valve
  • Open the bleed valve and de-pressurize the transmitter.
  • Check for 4.00mA output signal, if not, adjust the zero screw.