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?
Do Pressure Transmitter Zero check and verify the readings in the local display.
Sometimes, readings may drift, carry out the pressure transmitter calibration.
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.
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.
If your transmiter have H and L connection, check L connection.
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.
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.