How to calibrate a DP transmitter?

Interview Questions Instrumentation
1

The following steps are to be taken while calibrating:

  1. Adjust zero of the Transmitter

  2. Static pressure test : Give equal pressure on both sides of the transmitter. Zero should not shift. If it is shifting carry out static alignment.

  3. Vacuum test : Apply equal vacuum to both the sides. The zero should not shift.

  4. Calibration Procedure: . Give 20 psi air or 24Vdc supply to the transmitter. . Vent the L.P. side to atmosphere. . Connect output of the Instrument to a standard test gauge or Multimeter and adjust zero.

  5. Apply required pressure to high pressure side of the transmitter and adjust the span.

  6. Adjust zero again if necessary.

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