Problems with installing a single-flange differential pressure level gauge in a negative pressure tank
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The equipment is as shown in the diagram... There is a valve at end l. Should this valve be open or normally closed? At atmospheric pressure, the transmitter displays a pressure of 0; under negative pressure, it shows -4.7 kPa. At a height of 60 cm, when the pressure value calculated using the formula is set between -0.5 and 4.78 kPa, it is indicated that the liquid level is rising too rapidly. The range should be set based on the pressure value corresponding to the actual height of the liquid level; by the time the liquid level reaches 25 cm, the container is actually already full. Please have the expert analyze it for me.
I think the pressure tapping tube on the negative pressure side can be filled with the medium
Well, I just came across some information on this topic. The key issue here is setting an appropriate range: during the feeding process, the pressure in the lower part of the container changes rapidly, while the actual level of material lags behind; in the upper part, the pressure changes more slowly, and the actual material level is ahead. After the medium is emptied, the pressure displayed by the transmitter doesn’t return to its original value… The same problem occurred with two different transmitters, so it’s not likely to be a problem related to the linearity of the transmitters=
Under vacuum negative pressure, flange remote transmitters fail to accurately measure the pressure difference of the liquid column; various problems such as malfunctions occur. I wrote a popular science article many years ago for your reference........
But then again. Our small company, Shuaike, has now overcome this challenge – we have developed a new type of differential pressure level gauge designed for use in high-negative vacuum environments. It’s already available for purchase this year...... If you ever can’t find a good vacuum level gauge, come to me and buy the “Vacuum Master Level Gauge” instead, haha {:2_42:}