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Honeywell Sensotec Frequently Asked Questions |
Which Pressure Reference should I use for my application?
It really depends on what the application is. However the
best way to answer to this question is to show all of the various options
so that an informed decision can be made. The Pressure Reference Chart below shows the different points of reference against which pressure
is measured by the various pressure sensors.
Absolute pressure sensors reference pressure above absolute
zero pressure; thus, absolute pressure sensors are capable of measuring
pressure at any level.
Gage pressure sensors reference pressure above a sealed atmospheric
pressure; the atmospheric pressure used is the atmospheric pressure that
existed on the day the sensor was sealed.
Pressure Reference Chart
True gage pressure sensors reference pressure above the current
atmospheric pressure; because air can enter and exit through a vent in the
sensor, the atmospheric pressure referenced is today's atmospheric pressure.
Vacuum pressure sensors reference pressure of a vacuum below
atmospheric pressure; vacuum pressure sensors are scaled to report decreasing
negative pressure as increasing positive voltage.
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