Pressure transmitter issues
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It is a differential pressure transmitter with a capillary tube containing silicone oil. When the pressure is higher than that of the diaphragm, the pressure is low; when it is lower than the diaphragm, the pressure increases. When the differential pressure transmitter is at the same level as the diaphragm, the pressure is 0. If it is installed at the bottom of the pressure sampling hole, pressure will be continuously displayed. The type of this differential pressure transmitter is PDS. Is this due to the weight of the silicone oil?
Yes, this situation may be caused by the weight of the silicone oil. During installation, the silicone oil inside the capillary is affected by gravity and descends to a level equal to that of the differential pressure transmitter and diaphragm, resulting in a false pressure reading. To address this issue, the pressure tapping hole can be moved up by a certain height, so that the silicone oil does not reach the same level as the differential pressure transmitter and diaphragm, thereby preventing incorrect pressure readings. At the same time, it is also necessary to check whether the differential pressure transmitter and diaphragm are in good condition to ensure that there are no other faults. .
Yes, I need to review middle school physics again, haha
It is recommended to search for “zero point shift of pressure transmitters””
I have also been researching this recently. From my understanding, cascade control involves using two single-loop systems in series, with the output of the main loop serving as the input for the secondary loop, which then acts directly on the control valve. Series control consists of multiple variables and one control valve.
Is it feasible to adjust the transmitter’s zero offset under the current conditions? Please ask an expert for guidance
This is not zero-point drift; it is zero-point shift. Pay attention to the distinction between concepts
Just move it at zero point, that’s all. . .
This is a migration issue; it has nothing to do with zero drift