Single-flange pressure transmitter
Thread Content
During measurement with this transmitter, the pressure suddenly dropped to negative levels; after closing the shut-off valve, the negative pressure value continued to decrease and remained negative. What’s the reason?
After ruling out process-related issues, it’s basically a problem with the pressure transmitter; perform a pressure calibration!
Agree with the second-floor opinion; let’s give it a try for verification~
Take it apart to check the diaphragm, and then verify to see if it can be adjusted
Is the diaphragm broken? Take it off and have a look :)
First check whether the diaphragm is damaged, and then conduct a pressure test for verification
Based on the signs, it can’t be said that there is a problem with the pressure transmitter! Because the negative pressure is decreasing after the shut-off valve is closed! Further examination is generally required to clarify the issue.
Under normal circumstances, the pressure transmitter should show a value equal to the pressure in the pipeline. Check whether there are any other pressure gauges or transmitters on that pipeline, and compare the pressure values; if they are equal, then everything is normal, and instrument or process-related faults can be ruled out； If it’s different, then things get complicated. Check whether there is any leakage in the components from which the pressure transmitter draws its readings, or in the pressure conduits; if none of those issues exist, then the problem lies with the transmitter itself. After removing it and powering it on, it should display the atmospheric pressure value – if not, there’s something wrong!