Questions about float level gauges
Thread Content
One of the equipment in our factory has a diameter of 800 mm. When ordering the float, the flange spacing was mistakenly specified as 1000 mm; as a result, the upper flange was moved upward by 200 mm. The measurements were fine before, but now it shows that the tank is full at 80% capacity. Even if there is some error in the float, it shouldn’t be this large. Please help! Additionally: A double flange was used, with a differential pressure setting of 800 mm, but there was a problem of delayed liquid level indication; especially when the tank was nearly full, the liquid level still showed as 75–85%, and it took about ten seconds for it to reach 100%. It is suspected that this is related to the upper flange being raised by 200 mm, but the exact cause is unknown; help is needed!
How do you flip upward? Please provide a sketch! Estimation: There may be fluid resistance at the upper end.
A copy of such a level gauge presumably works by using the upward movement of a float to cause the display magnet to flip, thereby changing the reading. From a measurement perspective, there is inherently a certain time delay, and such lag is not a problem. As for issues with the range, I have never encountered such problems before. The solution suggested by the original poster has not been tested, so it’s unknown whether it is appropriate. Looking forward to explanations from the experts below
Sketches can’t be sent, damn it! ! ! It looks like climbing stairs, hehe; I wonder if you can understand it?
The diameter is 800 mm; when ordering the floating tank, the flange spacing was mistakenly specified as 1000 mm. As a result, the upper flange was raised by 200 mm. Measurements were fine before, but now the tank is considered full at 80% capacity. If it shows 80%, that means 800 mm has been filled – so shouldn’t the tank be full at that point? I’m not sure what’s wrong here.
The poster said raise the buoy? I don’t understand this! How about magnetic back plates? Is the magnetic backplate working properly?
It’s not a diameter of 800 mm; it’s the range that is 800 mm, right? I understand what you mean – the range of the float was set too high. In order to fit the flange of the float, a bend was added to the upper flange on the equipment so that it could connect with the float, correct? With this arrangement, when the tank is full, there might be air trapped above the upper flange, which could affect the accuracy of measurement and cause the reading to be lower. If a double-flange gauge is used, then why need to bend the upper flange upward? Air can still get trapped even when the tank is full. Just use a range of 800 mm without that bend. If there’s any delay in the response, check whether the damping setting is too high.