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.

What is a Pressure Transmitter?

A pressure transmitter is a critical instrument in industrial automation, measuring and transmitting pressure readings for various applications. It plays a pivotal role in maintaining the integrity of processes where pressure control is imperative.

Importance of Calibration

Accurate readings are the lifeblood of any industrial operation. Calibration is the process of fine-tuning a pressure transmitter to align its output with a standard reference. This ensures that the readings it provides are not just reliable but also precise, contributing to the overall efficiency of your systems

Equipment’s required

  • Pressure transmitter,
  • Multimeter,
  • HART communicator,
  • Flexible Tube
  • Fittings
  • 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 (%)

INPUT PRESSURE

OUTPUT CURRENT (IDEAL)

0%

0 PSI

4.00 mA

25%

25 PSI

8.00 mA

50%

50 PSI

12.00 mA

75%

75 PSI

16.00 mA

100%

100 PSI

20.00 mA

75%

75 PSI

16.00 mA

50%

50 PSI

12.00 mA

25%

25 PSI

8.00 mA

0%

0 PSI

4.00 mA

Read Also:-

Leave a Comment