Explain calibration of capacitive type level measurement.

Explain calibration of capacitive type level measurement.
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1 Answer

Answer :

➢ Calibration of capacitance type level transmitter

1. Remove the level transmitter from the system(tank).

2. check whether transmitter shows zero reading by connecting with multimeter otherwise release the pressure.

➢ if the transmitter is smart

1. connect control circuit to the level transmitter

2. multimeter to ma.

3. Fill the corresponding liquid in correct density and note down the readings.

Fill liquid at 25%, 50%, 75% and 100% in both ascending and descending orders and note down the readings.

4. check for errors if there is zero and span adjust should be done.

5. for zero calibration: drain the liquid and check the multimeter if it is not 0 then go to sensor trim option in the HART then go to zero trim and the HART communicator will automatically trim the sensor in to zero

6. For span calibration: fill 100% and wait for some time then go to sensor trim and select span trim in HART communicator the 475 will automatically trim the sensor into 20ma.

7. After doing zero and span trimming again check the reading at 0%,25%,50%,75% and 100%.

➢ In case of non-smart capacitance type transmitter

1. Connect a multimeter and rotate the zero pot and stop when multimeter shows 4ma.

2. Fill the chamber to maximum liquid level and rotate the span screw to 20ma.

3. Repeat these steps and check all readings


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