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Pressure measurement
Pressure transmitters can measure absolute, gauge, or differential pressures.
Absolute pressure
Absolute pressure is referenced to a perfect vacuum which is considered 0 psi! We express vacuum pressure as 0 psi (a).
Atmospheric pressure is usually about 14.7 psi (a).
Gauge pressure
The most common pressure measurement is gauge pressure which is the total pressure minus the atmospheric pressure.
Atmospheric pressure is 0 psi (g).
As we’ve discussed in our previous articles, the versatility of a differential pressure transmitter gives us the flexibility to measure
level and flow as well as pressure.
