Double-flange level gauge
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In a closed tank, the liquid level is measured using double flanges, but the lower flange (the high-pressure side) is not installed at the bottom of the tank. When the liquid level is below the lower diaphragm, the LT reads 0%. Since the lower diaphragm isn’t at the bottom of the tank, will the LT continue to show negative values as the liquid level drops further?
It normally should not be negative, as the pressures on the high-pressure and low-pressure sides are the same, resulting in a pressure difference of zero
No, the measurement range depends only on the two pressure tapping points and the density of the medium
After fixing the capillary and transmitter, you need to relocate them; only then will the readings be correct
Negative values will not be displayed; if they do appear, please zero the device.
It’s best if you try it yourself; it’s very easy to use
No, after installation, zero point should be calibrated before feeding begins; once the zero point is adjusted, the system can then be put into use
No. The principle of a differential pressure level gauge is that the pressure difference acting on two flanges is converted into a liquid level measurement. If the liquid level is below the high-pressure side, both flanges are under the same pressure, and the level display will show 0; it will not show a negative value, unless the zero point adjustment is not done properly during installation and calibration, or due to drift over time as a result of prolonged use.