Pressure Gauge Calibration

Pressure Gauge calibration

Pressure Gauge calibration is comparison of measurement values of a unit under test with those of a more accurate calibrated standard gauge.

Equipment Required

Pressure comparator:-

Pressure comparator is similar to dead weight tester. Which generates pressure to achieve the desired pressure.

pg calibration

Master gauge:-

Digital gauge is used as master gauge to  calibrate measuring instruments in ISO 9000 qualified laboratories. P.G.(Pressure Gauge) may offer an accuracy of ±0.1%, depends on the manufacturer.


digital pressure gauge

Gauge Calibration Sheet:-

The calibration sheet is used to note the readings of the pressure gauge compared on the comparator. The example of pressure gauge calibration sheet is given below.


pressure-gauge-calibration-sheet

PG Calibration procedure

  1. Check at ambient pressure without connection, gauge value should be zero. If not, adjust the zero screw or pull the pointer using needle puller & put it to 0 values.pressure gauge zero indication
  2. Now connect the pressure gauge to pressure calibrator.comparator
  3. Apply pressure till gauge span value & verify pressure gauge maximum pressure value should be same as standard gauge reading if not, correct the indication increase or decrease the sector arm.
  4. Apply pressure 50% of gauge span (for linearity adjustment)
  5. Adjust the length of link after pulling the pointer using puller and place at correct spot (at 50%)
  6. Verify linearity at check points 0%, 25%, 50%, 75% and 100% of full gauge span and fill the calibration sheet.
  7. Repeat these steps until correct value achieved.

Read Also:-

Pressure Transmitter Calibration.

DP Transmitter Calibration

Remote seal DP transmitter Calibration 

Pressure Switch Calibration

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