Problem of measuring liquid level with double flanges
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The Fuji double-flange gauge is used to measure the liquid level in the tank between compressor stages, and it has been observed recently that the instrument often exhibits zero drift. The zero check shows a high zero level; after zeroing, it functions normally, but this issue reoccurs after some time. The one I used before worked very well
Since there are no detailed installation diagrams, you can check whether there are any adhering substances at the installation location of your lower flange
Two possible reasons: 1. The medium is dirty； 2. The diaphragm box is under pressure or deformed. In my opinion, the gasket at the double-flange connection is inappropriate, which directly causes pressure to be applied to the diaphragm box. We have encountered this situation before; at that time, the double-flange level kept fluctuating. After adjusting the zero point, the issue was resolved, but it reappeared after some time. By opening the flange, it can be seen that the gasket is pressing on the diaphragm.
After the positive-pressure flange was removed, illegal items were found; after they were removed, normal operation was restored. Thank you all for your help