Vacuum pump differential pressure transmitter
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I would like to ask the experts here: currently, the negative pressure in the vacuum pump’s water vapor separator is -30 kPa, and the liquid level is around 1 meter. A double-flange differential pressure transmitter is being used. If the negative pressure side is connected to atmospheric pressure, what should be the pressure detected on the positive pressure side, which is at the same level as the bottom of the tank? (I’m a bit confused; I don’t know how to determine the pressure related to the liquid level and the vacuum pressure in a vacuum environment.)
Answer: Happy New Year! Wish you happiness from the first day of the New Year all the way to the 365th day! :Lol: 1. The pressure of a 1-meter water column is approximately 10 kPa. 2. When the low-pressure side of the differential gauge is exposed to air and the high-pressure side is at the same level as the bottom of the tank, the pressure acting on the high-pressure side equals the pressure of the gas phase plus the pressure of the liquid column. 3. When the pressure of the gas phase is -30 kPa and the pressure of the liquid column is 10 kPa, the pressure acting on the high-pressure side is -20 kPa
The high-pressure side uses hydraulic pressure in addition to the container pressure
I support your claim! That said, having the negative pressure side face the air makes the use of double flanges a bit wasteful, and the location of the diaphragm on the negative pressure side can also affect liquid level measurement.