Double-flange level gauge for vacuum tanks
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It is well known that the measurement of a double-flange level gauge is not affected by its installation location. But for measuring tanks in a vacuum environment, do most manufacturers specify that it is best to install them below the lower flange? After all, since it is installed at the bottom, the pressure exerted on the lower flange is reduced. Now we are facing this problem here, as due to process constraints, the gauge can only be installed in the middle. As long as the vacuum level is high, the gauge stops working; lowering the gauge head solves the problem. I wonder if, in everyone’s projects that use double-flange vacuum tanks for measurement, these tanks are placed below the lower flange. Are there higher-specification double flanges available that allow the gauge head to be installed in the middle or on the upper flange, without being affected by the installation location of the gauge head?
"As long as the vacuum level is high, the gauge will stop working. For the type of differential pressure gauge you are using, whether there is a capillary tube or not, and regardless of where the gauge head is located, it will fail as long as the vacuum level is high enough. Failure is the truth. If it doesn’t fail, that’s a miracle. :lol
There is a type of instrument called electronic telemetry. Instead of a capillary, two separate transmitters are used, one installed on each upper and lower flange. Intermediate cable connection. Can it perfectly solve your problem?
Capillaries are available; they start to fail when the vacuum level drops below 95. The distance between flanges ranges from 2 to 3 meters, and the gauge is usually installed about 2 meters above the lower flange. The table header will be fine below the lower flange
The electronic double-flange vacuum gauge from E+H that I used at my previous company was basically unaffected by the installation height, and its performance was quite good; the one used by this company has a capillary tube
The table header does not affect the measurement above or below the flange; regardless of its position, it needs to be shifted in place. To measure vacuum, a vacuum gauge must be used; otherwise, negative pressure cannot be displayed
The migration is ready; it works fine when it’s above 88, but it doesn’t work when it goes above 95
This is hard to explain; if migration occurs, the impact of high and low levels on it is ignored. What is the temperature of the medium?
It starts to fail at room temperature; even before any material is introduced, it simply doesn’t work once a vacuum level is established
This could be the effect of diaphragm deformation under negative pressure
This post was last edited by 1111111 on 2018-10-30 12:49 ..........