What problems can occur when using a gauge pressure transmitter to measure negative pressure?
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Is measuring negative pressure with a gauge pressure transmitter less durable than using an absolute pressure transmitter? It shows whether there have been any inaccuracies, or even damage to the pressure transmitters.
If the negative pressure isn’t high, it seems okay. If the negative pressure is too high, the diaphragm box of the gauge bulges outward. Generally, the specifications for negative pressure are provided in the instrument’s manual.
The negative pressure isn’t too high; it’s acceptable. If the negative pressure is too high, the diaphragm box of the gauge will be damaged. It is recommended to use an absolute pressure transmitter.
Not all pressure transmitters are suitable for this purpose; even if they can be used to some extent, there is still a range of pressures within which they can function properly. The closer the operating pressure gets to the measurement limits of the transducer, the greater the error, and eventually it may exceed the negative pressure limit, causing damage to the diaphragm box. It is better to use a dedicated negative pressure sensor. When measuring gas pressure (below atmospheric pressure), a vacuum pressure transmitter is appropriate, and it is better to use absolute pressure measurements in such cases.
Based on my current experience of using it. A gauge pressure gauge can indeed measure negative pressure, but when high negative pressures are measured for extended periods, the diaphragm bag may bulge outward. Additionally, there is a frequent occurrence of zero-point drift, which leads to higher maintenance requirements and affects accuracy. It is recommended to use an absolute pressure gauge if conditions permit.
Reply to 7# kun1884: It’s better to use gauge pressure; the accuracy of measuring negative pressure with absolute pressure isn’t very high, and it’s even worse for detecting negative pressures. It is highly recommended to use systems that measure negative pressure. Qingdao Forest Automation Technology Co., Ltd. at 0532-86895608 produces products of fairly good quality
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