August 2016, MARIETTA, GA ~ Do you know the technical differences between these three pressure measurements? If not, we've got you covered. These differences are derived from the fact that there are different types of pressure. Different types of pressure require specific units of measurement.

PSI: Pounds Per Square Inch
PSI is the most basic unit to measure pressure. The majority of pressure transducers are specified in pounds per square inch. There are several different forms of measurement under PSI, some of which include: PSIG and PSIA. 1 PSI = 6,894.75729 pascals.

PSIA: ABSOLUTE PRESSURE
PSIA is a unit for pressure measured relative to a full vacuum. Its referred to as pounds per square inch absolute.

PSIG: GAUGE PRESSURE
PSIG is one of the most common used and referenced forms of pressure. PSIG is the measurement of pressure relative to ambient atmospheric pressure and is quantified in pounds per square inch gauge.

See below for a side-by-side comparison of absolute and gauge pressure.

CLICK HERE to discover Setra's vacuum, gauge and absolute pressure transducers.