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Honeywell Sensotec Frequently Asked Questions |
What is a Differential Pressure Sensor?
Illustration of a Differential Pressure Sensor
A differential pressure sensor designed to detect a change in pressure
as the difference between two applied pressures. A differential pressure
sensor (See Figure 8a) employs a dual diaphragm with each diaphragm linked
to a common central gaged element (foil based sensors) or silicon substrate
(silicon based sensors). If both applied pressures are equal, both diaphragms
are balanced, and the reading shows zero; but if either diaphragm see a
different pressure from the other this differential pressure is transmitted
to the gaged element. As the gaged element or silicon substrate is deflected
so the gages register a change in resistance The bridge circuit identifies
the resulting change in electrical resistance as a change in applied pressure
to the sensor.
Differential pressure sensors are commonly used to measure the rate of
flow in a pipe. By monitoring the pressure drop on either side of an orifice
plate, the mass flow rate of the fluid in the pipe can be determined.
(Consult the Pressure Reference Chart
to compare how the various pressure sensors reference pressure.)
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