Where is the zero line of a single-flange level gauge?

One should give a rational explanation, rather than just saying “it’s fine”. If no rationale is provided, if errors and precision are not taken into account, then what’s the problem with using the upper edge of the flange as the zero point, or the lower edge of the flange as the zero point, or any random point on the flange diaphragm as the zero point? It’s perfectly fine to do that One must reason things through; convince others with logic.

Theoretically, the center line of the flange is used as the zero point for the liquid level. Because the flange interfaces are installed centered on that height during equipment manufacturing. In practice, the lower edge of the flange is used as the zero point. This is because zero calibration is always performed with the flange in a pressure-free state (not in contact with the liquid level). The measurement results of a flange level gauge are inaccurate when the diaphragm on the flange is not fully submerged. For example, for a φ80 flange, when the liquid level reaches half (40 mm), since only half of the diaphragm is exposed to pressure, the measured pressure will be reduced by half (to 20 mm). (Only in theory; in practice, differences exist due to the diaphragm structure.) During the design of the storage tank, there is at least a 20% margin between the highest liquid level and the actual point of overflow, while the liquid level required for operational purposes actually only varies within certain limits. So there’s no need to worry about the actual height of the zero position on the device at all.

To put it bluntly, what I mean is that the Flange has a “big face” – it’s like a low-precision, rough measuring instrument. In other words, the size of the Flange’s big face determines how large the zero point for the liquid level can be! Got it! Don’t worry about such minor details as 1mm or 0.1mm! Otherwise, you’ll have to conduct experiments; you’ll need to adjust the liquid level gradually, and carefully observe the point at which the differential pressure gauge reaches zero That point with mathematical significance. Moreover, mounting it on the flange side goes against the principle of uniform pressure on the diaphragm; it’s nothing but a reckless and nonsensical approach. Don’t be too serious; being serious will get you into trouble, and you’ll die unjustly........

Of course, following the center line, I actually agree with what was said on the fourth floor – there’s no need to worry about that. Just install it in the way the manufacturer designed it; nowadays, after installing the smart meter head, it can be set to zero right away, which is perfect.

People with disabilities are born disabled, and they also act in a sneaky manner. Stop sending private messages to insult others; the forum is meant for everyone to learn and communicate. There’s no need for you to judge whether what others say is right or not. Insulting others so easily shows a really poor level of character. It seems that fate is fair to people like you who are disabled: lol

:Lol, that’s not right; what are you talking nonsense about? Why don’t you do something good and say something right? Are you just unable to say the right thing, or do you have malicious intent to create confusion? I think you’re a 🈶mischievous person. That’s why I have to confront you; I must shut down your twisted ways. I’ll confront you with confidence – wherever you spout nonsense, I’ll go there to deal with you, crushing you, knocking you down, paralyzing you, making you tremble and groan like a ghost,,,,:lol. What is integrity? Integrity means speaking the truth and standing up for what’s right, it doesn’t mean kowtowing to foreign brands or big names, nor does it mean tolerating people like you with their twisted attitudes. . . I’m just a tough guy – if you disagree, come and fight; if you disagree, come and argue.... {:2_45:}