Please resolve the issue with the double-flange differential pressure transmitter! !
Thread Content
On-site, the range of the double-flange differential pressure transmitter has been adjusted, and its specific gravity has been verified to be correct. The valves on the equipment are also functioning properly. The local level gauge indicates a liquid level of around 50%. However, once the double-flange differential pressure transmitter is installed and put into use, it keeps showing an over-range reading of -5%. Using a handheld controller, it was found that the pressure in the negative pressure chamber is higher than that in the positive pressure chamber; there are no issues with the process equipment. What could be the cause? Diaphragm issue? Is there still a problem with the capillary?
1: Negative migration was not done correctly. 2. The positive and negative sides of the differential pressure transmitter are not set correctly.
It might be due to inaccurate migration calculations, or the magnetic flap level gauge in place is at the 50% position of its scale.
1. The transmitter does not exhibit negative drift. 2. The local level gauge gives inaccurate readings (due to blockage). 3. Leakage on the positive pressure side. 4. Capillary leakage. 5. The diaphragm on the negative pressure side is compressed by foreign objects such as gaskets
After the instrument was installed, the migration was not done correctly; in other words, the migration you performed was incorrect. Please check this!
There was no negative migration, nor was the flange on the positive or negative side installed in the wrong direction
If the original poster is correct, there are three possible explanations for your problem: 1. The flange diaphragm on the low-pressure side is being abnormally compressed by foreign objects； 3. The indication of high and low voltage chambers was incorrect, resulting in the high and low voltage flanges being installed in reverse ； 3. The capillary curvature at high pressure is out of range, causing a blockage on the high-pressure side.
We repair various imported Rosemount EJA transmitters, as well as different types of flanged level transmitters and double-flange capillary level transmitters; both oil-filled and flanged versions are available. We can ensure short lead times – hope this can help you