Negative Reading in Pressure Transmitter

Hallo guys, I have problem using pressure transmitter connected to RTU device power up by battery. The measurement data become negatif until 2 weeks , I check the voltage battery is normal. Can anyone give me advice?

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Do Pressure Transmitter Zero check and verify the readings in the local display.

Sometimes, readings may drift, carry out the pressure transmitter calibration.

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Ensure the reading of your pressure transmitter is zero, when it is not at work.
Then, calibrate your pressure transmitter when it is at work.

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There is always the chance you are somehow pulling a vacuum on you transmitter. While that is unlikely if it is on top of a storage tank or something that a pump is pulling from and somehow your vapor blanket has been lost.

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If your transmiter have H and L connection, check L connection.

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That’s a good point but hopefully if they are using a DP it would be vented to atmosphere. Something we found on one of ours was it had drifted maybe check if it is a DP set up to atmosphere check tp ensure it has not drifted.

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Obviously it must be venting to the atmosphere, but that does not ensure that line (L) is not blocked on its way to the atmosphere, check L connection.