Equipment required:
- Datasheet,
- Pressure calibrator,
- Multimeter,
- Hart communicator
Procedure of DP Level Transmitter Calibration at field:
- Man placed the computer in the control circuit manual mode and placed it on the ESD circuit MOS.
- Refer to the datasheet to hook up HART Communicator and check some parameters. Typical parameters are PV, LRV and URV tag amount.
- Isolate from the method of the tool.
- Release both pressure and drain low and high side liquid throughout the manifold drain.
- Open both plugs at seal pot.
- Top up seal liquid for the low side until half of the seal pot.
- Remove tubing at the high side of the manifold.
- Hook up the calibrator on the at high side and isolate the vent valve
- To evaluate the present signal, hook up a multimeter in sequence with the signal to the DCS.
- If the amount equal to zero is applied as per calculation, the multimeter should display 4mA.
- If not, use HART Communicator to adjust zero at the transmitter
- Apply pressure according to the calculation if the amount is equal to 100%, the multimeter should show 20mA.
- If not, use HART Communicator to adjust the receiver
- After finishing the task, request the board driver to return loops to normal mode or to normalize the MOS.
- Fill out and submit the calibration form for future reference.