Confusions in selecting gauge pressure transmitters and differential pressure transmitters
Thread Content
In a vacuum environment, both absolute pressure gauges and differential pressure gauges can be used for measurement. Which one do people usually prefer? In an environment with both vacuum and positive pressure, manufacturers claim that the diaphragm of a gauge pressure meter is prone to damage; I don’t understand this, as a gauge pressure meter’s diaphragm should have only one direction in which it can move. It’s actually differential pressure meters that are subject to forces acting in two directions in such an environment, which makes them more likely to get damaged. I seek advice from those who are more knowledgeable!
It depends on the process requirements; it depends on the usual practices in the processing!
This is how we usually choose tables. If the measured pressure is a slight negative or positive pressure, it is better to use a differential pressure transmitter, as such transmitters provide accurate and reliable measurements. However, if the measured negative pressure is relatively high, it is better to choose a gauge pressure transmitter. If there is both positive pressure and negative pressure, a differential pressure transmitter is generally chosen as well.
Excuse me, upstairs: some gauge pressure transmitters have a range that extends well beyond the vacuum range. If they are only suitable for measuring vacuum, then why would manufacturers produce them with such a range?
It should be fine in both cases; they just use different benchmarks for measurement
Hehe, is there a range that goes beyond absolute vacuum? Haven’t encountered it. Did the original poster not express themselves clearly? This post was last edited by ZZD109 on 2009-4-11 10:45.]
Differential pressure gauges are indeed rarely used for measuring vacuum – I’m talking about true vacuum, not just ordinary negative pressure. It is recommended to use gauge pressure gauges instead~
The diaphragms are all the same! ! In all cases, it is the diaphragm that is subjected to two forces. In the case of vacuum gauges, the positive or negative pressure chamber is made into a vacuum condition; therefore, the forces acting on them are less compared to those in differential pressure gauges. If it is said to be prone to damage, it is due to manufacturing processes, not mechanical reasons
1. Under vacuum conditions, choose the gauge pressure type, as vacuum gauge pressure offers greater advantages; after all, it is designed for such purposes. 2. If mixed pressures are involved, then opt for the differential pressure type – it has stronger performance capabilities and a wider adjustable range