How can one determine if the zero point has shifted in a double-flange level gauge?
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For measuring liquid level using double flanges, I know that one needs to close the pressure tapping ports at the top and bottom, then vent the system and check whether the display returns to zero in order to determine if there is zero drift. However, to achieve a zero point (the bottom line) when measuring the boundary level, the medium must be filled to capacity; dual flanges, unlike float tanks, cannot be filled with light medium on their own. So what should be done in such cases? The stupidest approach is to remove one and place it at the same height as the other flange to make a judgment, but it seems too troublesome. Is there a simple and convenient way? Thank you to all the masters! ! ! !
First, theoretical calculations can be carried out: the density of the oil filled inside a double-flange transmitter is constant, and this value can be determined by referring to the model and the manufacturer of the instrument, after which the theoretical pressure difference can be calculated and compared with the current pressure difference in the absence of medium. Second, when conducting testing while the device is in operation, it is necessary to perform migration on the double-flange transmitter; you should record the migration values and compare any changes in those values.