Backward installation range setting and offset for Azbil double-flange transmitters
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I now have a new Azbil double-flange transmitter, and I need to measure the interface of a one-meter tank where the densities of the two fluids are 1.0 and 6.3. However, according to Azbil’s requirements, the transmitter should be installed in an inverted configuration with positive and negative pressure chambers: the upper flange serves as the positive-pressure chamber, while the lower flange functions as the negative-pressure chamber. Does anyone have the relevant instructions? How should the measurement range and zero-point adjustment be calculated?
This post was last edited by ssln123 on 2018-2-27 at 16:34. The lower limit of the gauge range is (p0-p1)gh, and the upper limit is (p0-p2)gh, where p0 is the density of the capillary silicone oil or another pressure-transmitting medium, p1 is the density of the lighter medium, and p2 is the density of the heavier medium. The value of p0gh can also be read directly when the tank is empty, which provides more accurate results compared to calculation.
But once the positive and negative pressure chambers are installed in reverse, how should the calculations be done? Your calculation method is for the case where the positive and negative pressure chambers are installed in the correct orientation
It doesn’t matter; whether it’s in normal or reversed orientation, the differential pressure is always from the positive-pressure chamber to the negative-pressure chamber. The migration amount is negative in the normal orientation and positive in the reversed orientation. (The migration amount here refers to the migration of the empty tank used for measuring the liquid level; it is not equivalent to the lower limit value of the interface.)
Could you calculate the interface level based on the densities of the two fluids I have now: water at 1, and the other fluid at 0.63? The tank height is 1 meter. It would be helpful to have an intuitive calculation. Thank you
Dual flanges can be used; the differential pressure range is sufficient.