Can a gauge pressure transmitter be used to measure negative pressure?
Thread Content
As shown in the EJA gauge pressure transmitter, its measurement range extends up to -100 kPa; does this mean it can be used in vacuum conditions? Since gauge pressure can be measured down to -100 kPa, why are there absolute pressure gauges as well? Is it just because the display values in the table headers for the two are different? Please, experts, help me resolve my confusion
Gauge pressure transmitters can be used to measure negative pressure, including vacuum. A measurement range of up to -100 kPa indicates that it can measure pressure values below atmospheric pressure. The difference between a gauge pressure meter and a absolute pressure meter lies in their reference points. A gauge pressure meter measures relative to vacuum; it can determine the pressure value with respect to vacuum. A gauge pressure meter measures relative to atmospheric pressure; it can determine the value of pressure in terms of atmospheric pressure. Gauge pressure meters and absolute pressure meters exist primarily to meet different application scenarios and requirements. Some applications require measuring pressure changes relative to atmospheric pressure, while others need to measure pressure changes relative to vacuum. Therefore, choosing a gauge pressure meter or an absolute pressure meter based on actual needs allows for more accurate measurement and interpretation of pressure values. .
I have a question: I’ve seen absolute pressure transmitters being used to measure the inlet pressure of air compressors. Why is that?
The static pressure is used when calculating the pressure ratio for anti-surge purposes
1. This table shows the parameters of the measuring elements of EJA transmitters; as for the specific types of measurements that can be performed by the transmitter (absolute pressure, gauge pressure, differential pressure, negative pressure), it depends on the type of measurement chamber used with the transmitter； 2. Absolute pressure and relative pressure are two different concepts. .
Personally, I think it’s just for the convenience of calculation
Understood, thank you:handshake
We use a pressure transmitter to measure the absolute pressure in the furnace chamber of our heating furnace