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CALIBRATION OF PRESSURE TRANSMITTER
Place the transmitter at the test table, read the information given on the instrument
tag and specifications supplied along with by the vendor.
Please follow the steps following
1) Arrange the test bench for calibration of the pressure transmitter.
2) Supply regulated air pressure (instrument air) or electric power supply to the transmitter.
3) Apply required pressure by pressure generator (a dead weight tester, variable air supply or a hand-operated pump) and a check out put on multi meter or pressure gauge.
4) The actuating pressure shall be connected to the instrument’s process port.
5) Apply pressure approximately to the full range of the transmitter to check leakage in the system, use soapy water for detection.
6) De–pressurize the system.
7) Check and record the readings at “zero percent” pressure.
8) Now increase the pressure step wise and record the readings for “25%,50%,75% and 100%.
9) Decrease the pressure in descending order from 100% to 0% in stages of 75%,50%,25% and at last at 0% and record the readings. These shall verify the previous readings taken.
10) In case percentage error is greater than the specification requirements, adjust the “zero and span” again and repeat the step # 7, # 8, # 9.
11) After completing the process issue the test report for site use and record.