# How to calibrate Differential pressure gauge (DPT) level transmitter at field?

**URL:** <https://forumautomation.com/t/how-to-calibrate-differential-pressure-gauge-dpt-level-transmitter-at-field/6518>\
**Category:** Calibration\
**Created:** [June 8, 2019, 6:11pm UTC](https://forumautomation.com/t/how-to-calibrate-differential-pressure-gauge-dpt-level-transmitter-at-field/6518 "2019-06-08T18:11:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sivaranjith](https://forumautomation.com/letter_avatar_proxy/v4/letter/s/ba9def/32.png) [@sivaranjith](https://forumautomation.com/u/sivaranjith)\
**Post date:** [June 8, 2019, 6:11pm UTC](https://forumautomation.com/t/how-to-calibrate-differential-pressure-gauge-dpt-level-transmitter-at-field/6518/1 "2019-06-08T18:11:02Z")

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Equipment required:

- Datasheet,

- Pressure calibrator,

- Multimeter,

- Hart communicator

Procedure of DP Level Transmitter Calibration at field:

![Level%20cal](https://cdn.forumautomation.com/original/2X/8/81a928f3aba0f13d8d2d1312e9dc62c6ed78efda.png)

- 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**](https://forumautomation.com/t/hart-communtication-highway-addressable-remote-transducer/2383) 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](https://forumautomation.com/t/what-is-distributed-control-system-dcs/2976).

- 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.