Differential pressure level gauge-----Level measurement issues
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The differential pressure level gauge (capillary) installed in the sealed tank had no issues with its range of measurement; however, leakage was observed at the lower flange during operation. The flange was therefore tightened, but after doing so, it was found that this had a significant impact on the liquid level – the level was 203 mm before tightening, but rose to 256 mm after it. I was wondering if this is normal? If it’s not working properly, then how can we fix the flange leakage? Thank you! !
It means the pad or dirt is pressing against the diaphragm
It makes sense, because the inside of the tank is too dirty, with solid powders and oil. So what should we do? ? Do I need to remove it again? ? But all the equipment is now running
This post was last edited by 1111111 on 2018-1-30 at 13:13. This is the error caused by the effects of installation stress. The correct procedure is to first secure and install the differential pressure gauge, then power it on for preheating, and finally perform migration zeroing. . . Some kids and amateurs loosen the flange to empty the diaphragm, carry out migration calibration, and then tighten the bolts for installation – that’s complete nonsense. Mistakes must be corrected. Otherwise, for low measurement ranges, the relative error caused by stress will inevitably be large as well. .
There is a leak, so the positive pressure side is at a lower level; once it’s tightened, the liquid level will definitely rise. Is there any other liquid level reference on site?
There is a leak at the flange; in other words, there is seepage that causes wetness, right? It’s not going to be the case where water keeps flowing continuously and can’t be stopped, is it? . If that’s the case, I think tightening the bolts will, first, not change the pressure inside the tank; second, it won’t alter the position of the gasket; third, aside from the tightening stress causing a slight deformation of the diaphragm, which in turn leads to changes in the pressure of the silicone oil behind the diaphragm! Damn, you idiot! You can’t even think of a four anymore........
If you’re not afraid of the hassle, clean it regularly; if you prefer things to be easier for you while still requiring high accuracy and reliability in measurements, it’s advisable to choose another type of level gauge.
The gasket is pressing against the diaphragm; this is a defect present in products from certain manufacturers, which forces us to replace the gaskets from time to time.
If you think 203 mm before tightening the bolts is an appropriate value, then 256 – 203 = 53 mm. By moving this 53 mm further, you’ll get the right result. . . Don’t worry about what the reason is; who knows what it is? I could come up with 1000 possible reasons, but you’re not going to verify them, right? You certainly wouldn’t design an experiment to reproduce those symptoms, right? . Just correct the error and that’s it. The real reason is of no use to you, and not even a little use to us. The monkey laughed {:2_36:}