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Calibration Pressure Measurement

Differential Pressure Transmitter Calibration Procedure

Differential Pressure Transmitter Calibration Procedure
differential-pressure-transmitter-calibration-procedure

Calibration Procedure :

  1. Set up the differential pressure transmitter, HART communicator, power supply, hand pump, and the multimeter as below (see below calibration setup Diagram).
  2. Make sure the equalizing valve manifold is closed.
  3. Apply a pressure to the transmitter equal to a lower range pressure (usually it correspond to 4 mA in the transmitter output). For example we have 0 to 100 mBar calibrated range, then the lower range pressure is 0, or let’s say we have -2 psig to 5 psig then we have lower range pressure equal to -2 psig.
  4. Read the pressure in the transmitter LCD (or in the HART communicator). Adjust (if any) through the HART communicator so that the output of the transmitter (on LCD) is the same with the applied pressure.
  5. Read the mA output of the transmitter by using a multimeter. Adjust (if any) through the HART communicator so that the output of the transmitter (on multimeter) is 4 mA.
  6. Apply a pressure to the transmitter equal to an upper range pressure (usually it correspond to 20 mA in the transmitter output).
  7. Read the pressure in the transmitter LCD (or in the HART communicator). Adjust (if any) through the HART communicator so that the output of the transmitter (on LCD) is the same with the applied pressure.
  8. Read the mA output of the transmitter by using a multimeter. Adjust (if any) through the HART communicator so that the output of the transmitter (on multimeter) is 20 mA.

Differential Pressure Transmitter Calibration Setup

Typical tools required:
  1. 24 VDC power supply
  2. Multimeter digital
  3. Pneumatic hand pump (up to 600 psig)
  4. Hydraulic hand pump (up to 10.000 psig)
  5. Low pressure hand pump
  6. High precision digital test gauge
  7. HART communicator
  8. Screwdriver toolkit
 Note: point number 1, 2, 7, and 6 of the typical tools above can be replaced by a single multi-function calibrator available in the market.

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5 comments

Prashant October 5, 2016 at 4:33 am

Why you have used 250 ohms resister there is it necessary to use when we have connected transmitter to PLC module.

Reply
jayesh sundar gopinath July 9, 2017 at 4:58 pm

we do not need 250 ohms resistance when we use plc module,however in the diagram it is clear they are using only a power source so for transmitter communication we need a resistor.

Reply
Shanmugam November 19, 2016 at 6:23 am

Thanks! good information, fantastic…..

Reply
Md Mehebub January 25, 2017 at 11:50 am

Thanks for your contribution.

Reply
Onye August 7, 2018 at 12:59 pm

Thanks for the knowledge sharing

Reply

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