How to migrate double-flange level instruments
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Newbie seeking help: How to transfer double-flange level gauges? Looking for a simple method
Whether the tank can be emptied, filled, or whether the flange can be removed. Is it adjusted using a HART communicator or something else?
1. For double-flange level gauges, regardless of the height at which the gauge face is positioned, negative migration always occurs, and the amount of this negative migration remains constant, equal to ρ0gH. ρ0 is the density of the isolation fluid (kg/m3), g is 9.81, H is the range height (m), and the unit of the calculation result is Pa. 2. The interface and liquid level are related to the range of measurement, and have nothing to do with the displacement amount of the double flange design.
The last edit to this post was made by jcicwht on 2016-9-21 at 20:46. After setting the range, verify that the light component is above the upper flange; then set the zero point at the lowest point of the interface
For small migration amounts, a zero potentiometer can be used for adjustment; for larger amounts, a migration potentiometer is utilized. Intelligent transmitters can be adjusted using a handheld operator.
Before the new gauge is installed with an unmodified range, the differential pressure value displayed when the tank is empty represents the migration amount.
This method is good; it basically eliminates the need for calculations. I’m not sure if it’s accurate, but I’ll give it a try next time
Some use a handheld controller for migration, while others can be adjusted manually