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What is Absolute Pressure – PSIA?

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46 views asked Mar 18, 2015 by Joe Mahini

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Measures pressure referenced to an absolute vacuum, hermetically sealed at 0 PSIA. When the pressure port is exposed to the atmosphere, the transducer will indicate atmospheric pressure; approximately 14.7 PSIA. This occurs because there is a vacuum on one side of the diaphragm and atmospheric pressure on the other. The net output represents the difference, which is atmospheric pressure.

Depending on accuracy class, PSIA transducers above certain pressure levels may not have an absolute vacuum reference. They can be sealed with atmospheric pressure because the possible measurement errors will stay within the accuracy specification of the transducer.
answered Mar 18, 2015 by Joe Mahini

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