How To Calibrate Differential Pressure Gauge (DPT) Level Transmitter At Field?

- Aug 20, 2019-

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 HART1 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.