Problems with differential pressure level gauges
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One of our small devices is in the cold-testing phase. These past few days, it has been observed that the liquid level indicated by most differential pressure level gauges fluctuates significantly when pressure is applied, after being at a normal pressure level. For example, the liquid level is 50% at normal pressure; when the pressure is increased to 1.0 MPa, the level can drop sharply to 15%, but it remains stable at this pressure level. When the pressure is further increased to 2.0 MPa, the fluctuations become smaller, and the level rises to 17–20%. Please discuss what causes this Could it be that the differential pressure level gauge is defective?
What is the device, what is the liquid medium, is an isolation fluid used? Is it caused by the change in density when the liquid is under pressure?
Have your differential pressure transmitters experienced negative drift? If no isolation fluid is used, an increase in temperature can raise the pressure; when the temperature rises, condensed liquid may enter the negative-pressure conduit, resulting in inaccurate measurements. Furthermore, as mentioned above, pressuring the system in some way changes the density of the medium, resulting in inaccurate measurements.
Is it an intelligent differential transformer, or a type II or type III differential transformer? Are there any other on-site level gauges? If so, has the actual liquid level changed? It is estimated to be a type III electrical differential variation or a type II electrical differential variation, resulting in a static pressure error under pressure. . . . .
I guess there are bubbles in the pressure induction system; when pressure is applied, these bubbles can compress, resulting in measurement errors
It should be caused by a change in the medium density