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Honeywell Sensotec Frequently Asked Questions |
What is a Vacuum Pressure Sensor?
Pressure Reference for Vacuum Pressure Sensor
Vacuum can be measured in two ways. By a) a Gage Pressure Sensor measuring
pressure below atmospheric pressure (ie referenced to atmospheric pressure)
or b) by an Absolute Pressure Sensor measuring pressure greater than absolute
zero but less than atmospheric pressure. For user convenience the Gage Pressure
Sensor designed for vacuum applications is usually scaled to report a decrease
in pressure below atmospheric pressure as an increase in positive voltage.
Thus, at current atmospheric pressure, a vacuum pressure sensor actually
reports 0 psi; but at absolute zero pressure, a vacuum pressure sensor reports
the value of the current atmospheric pressure as psi of vacuum.
Because vacuum pressure sensors are measuring small pressure changes (max
of 15 psi) the output can be scaled inches of water, inches of mercury or
in psi.
(Consult the Pressure Reference Chart
to compare how the various pressure sensors reference pressure.)
Note: Sensotec uses the term vacuum gages to define gage pressure sensors
scaled in psi of vacuum or inches of water of vacuum. Absolute gages that
are scaled to 15 psi are just considered absolute gages.
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