Wedge flow meter
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The flow meter has suddenly shown a negative reading; it is currently operating at this negative level and cannot be disassembled for inspection. I would like to know what could be the reasons for this. The medium in question has high viscosity due to its high molecular weight – please help analyze this situation. Thank you
It’s possible, but I wonder if there are other reasons as well
Reorganized components – what exactly are they? How high is the temperature? They said upstairs that it’s blocked – that’s a very likely possibility!
Is the pressure guide tube filled with isolation fluid? This way, it’s not easy to get clogged, unless the isolation fluid is drained.
The pressure guide tube is also double-flanged. There is a high possibility that the pressure guide tube is blocked, and the double-flange diaphragm has been stuck by oil
This post was last edited by Sikong Zhaixing on 2017-4-17 at 20:43. Is no root valve installed at the outlet of the wedge-type flow meter? There is a valve that allows direct access to check whether the double flanges are blocked or damaged, as well as to verify the zero point and ensure that the double flanges are in good condition. If the double flanges are fine, then that’s a problem. In addition, it is also necessary to check for any effects caused by issues such as bubbles or other imperfections within the tube.
Does operation at sub-zero temperatures change with flow rate?
Due to medium reasons, all the wedge-type valves here are rootless valves
Is there heat tracing at the root? It’s also possible that the diaphragm box is damaged; I’ve encountered problems with deformation of the transmitter diaphragm boxes in many of my wedge flow meters.