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Honeywell Sensotec Frequently Asked Questions |
What is a Gage Pressure Sensor?
Illustration of a Gage Pressure Sensor
A gage pressure sensor is a bonded foil strain gage-based pressure sensor
designed to measure applied pressure referenced to sealed atmospheric pressure.
The atmospheric pressure in a gage pressure sensor, which is sealed to prevent
moisture and other air particles from entering the sensor, always reflects
the atmospheric pressure on the day of manufacture, as opposed to the current
or other date.
A gage pressure sensor operates in the same way as a bonded foil strain
gage-based pressure sensor. As pressure is applied to a diaphragm, pressure
is transmitted to a gaged element via a mechanical connection, such as a
bolt. As the gaged element is deflected, strain gages, which are bonded
to the element, reflect this as a change in resistance. The bridge circuit
identifies the resulting change in electrical resistance as a change in
applied pressure to the sensor.
(Consult the Pressure Reference Chart
to compare how the various pressure sensors reference pressure.)
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