128 Advanced User Guide
8 Auxiliary Devices
About Pressure Control
Pressure units
There are two common ways of expressing gas pressures:
psia Absolute pressure, measured relative to vacuum.
psig Gauge pressure, measured relative to atmospheric
pressure. This name is used because most pressure gauges have
one side of the sensing element exposed to the atmosphere.
The two measurements are related by:
psia = psig + atmospheric pressure
To Next Page
Loading...
