Appendix A -- Introduction to Pressure Measurement
TYPES OF PRESSURE MEASUREMENTS
A
Pressure is measured with respect to an absolute vacuum.
BSOLUTE (
PSIA
)
DIFFERENTIAL (
PSID
)
Pressure is measured with respect to a second pressure port.
GAUGE (
PSIG
)
Pressure is measured with respect to atmospheric pressure.
Same as a differential pressure sensor with the second port open to
the atmosphere.
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