Pressure Transmitter Calibration
Pressure transmitter calibration is necessary for industrial safety.Pressure transmitter needs to be calibrated to ensure their accuracy and reliability. Pressure transmitter is very easy to calibrate. In this article will look at how to properly calibrate Pressure Transmitter.
· Pressure transmitter,
· HART communicator,
· Flexible Tube
· Hand held test pump (pressure source).
Procedure Of Pressure Transmitter calibration
- Ask panel operator to put the controller in manual mode for control loop and to put it on MOS for ESD
- Hook up HART Communicator(skip if transmitter is Non smart) and verify some parameters by refer to data sheet. Typical parameters are, tag number, PV, LRV and
- Isolate the Pressure Transmitter from the
- Open the drain plug and the drain valve to release the
- Hook up the hand held test pump (pressure source) to the Ensure there is no leak.
- Hook up the multimeter with the transmitter and ensure that output is 4mA when 0% pressure is applied, if output is not 4mA adjust zero with button(for non smart) or HART(smart transmitter).
- Apply span pressure and check 20 mA in multimeter , if output is not 20mA adjust span with button(for non smart) or HART(smart transmitter).
- Apply pressure range at 0%, 25%, 50%, 75%, and 100% of span and check output 4mA, 8mA,12mA,16mA, 20mA respectively.
- Take the transmitter on line. Ensure there is no leak
NOTE: Small example of five point calibration is given below:
Low range value = 0psi
Upper range value = 100psi
PERCENT OF RANGE (%)
OUTPUT CURRENT (IDEAL)