Calibration of Pressure Gauge & Vacuum Gauge

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Remove the under calibration pressure gauge and fix it on the one arm of pressure comparator jig and fix the master pressure transmitter with indicator to another port. Note down following data in calibration certificate.

  • Nomenclature
  •  Location  ID
  • Range
  • Least count
  • Ambient Temperature (ºC)
  • RH

 

Apply pressure from the comparator jig to the master pressure transmitter with indicator and under calibration pressure gauge.

Note down the observations in calibration certificate.Note down five readings of the master pressure indicator and under calibration pressure gauge in increasing and decreasing order of the full scale.

Calculate the % accuracy at full-scale deflection of gauge under calibration by using formula.

% Accuracy at FSD =   S/ F.S.  X 100, S = Deviation from standard, F.S = Full scale deflection

Note down % accuracy of F.S.D. in calibration certificate of master gauge and under calibration gauge.

Fill up the calibrated tag and attached with calibrated gauge.

Reinstall the pressure /vacuum gauge at its specified location.

Acceptance Criteria: Pressure / vacuum gauge = 3% OF F.S.D.

 

 

 

S   =   Deviation from standard.

 

F.S = Full scale deflection.

 

  • Note down % accuracy of F.S.D. in calibration certificate of master gauge and under calibration gauge.
  • Fill up the calibrated tag and attached with calibrated gauge.
  • Reinstall the pressure /vacuum gauge at its specified location.

 

  • Acceptance Criteria
    • Pressure / vacuum gauge = 3% OF F.S.D.

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