Air pressure
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Summary
Introduction
Air pressure sensors are commonly used to measure breath pressure. They usually incorporate a diaphragm and strain gauge. A pressure chamber contains an inlet port and an outlet port, which are separated by a diaphragm. The diaphragm is mechanically linked to a strain gauge.
Depending on the thickness of the diaphragm, it is classified as either a membrane (thicker) or thin plate (thinner). In either case, the diaphragm will deform in a predictable fashion under pressure. The deformation is mechanically translated through the strain gauge. The resistance of the strain gauge will change depending upon the deformation it undergoes, and this resistance can be translated into an output voltage.
There are two main types of air pressure sensors:
- Absolute pressure sensors. These have an internal vacuum reference and an output voltage proportional to absolute pressure. There is only one inlet which allows air pressure to be applied to one side of the diaphragm.
- Differential pressure sensors. These allow application of pressure to either side of the diaphragm and can be used for differential pressure measurements. They have two inlets, each leading to opposite sides of the diaphragm. The output voltage of the device is proportional to the pressure difference across the diaphragm.
Devices
Source Country Price Jameco (http://www.jameco.com/) USA US$ 24.95
[edit]Fujikura XFPN-025
-1.1 to 2.5 PSI Pressure Sensor
Variants:
- Fujikura XFPN-050 ( 0 to 5 PSI US$15.95 )
- Servoflo FPM07PG ( 0 to 7 PSI US$11.95 )
- Motorola MPX10GS ( 0 to 1.45 PSI US$8.99 )
Datasheet: [1] (http://jameco.com/wcsstore/Jameco/Products/ProdDS/196103.pdf) (pdf)
Resources:
Notes:
Source Country Price Digikey (http://www.digikey.com/) USA US$ 26.82
[edit]SenSym/Honeywell SX01GD2
0 to 1 PSI Absolute Pressure Sensor
Variants:
- SenSym/Honeywell SX05GD2 ( 0 to 5 PSI Absolute Pressure Sensor US$27.75 )
- SenSym/Honeywell SX15GD2 ( 0 to 15 PSI Absolute Pressure Sensor US$19.88 )
- SenSym/Honeywell SX01DD4 ( 0 to 1 PSI Differential Pressure Sensor US$24.50 )
- SenSym/Honeywell SX05DD4 ( 0 to 5 PSI Differential Pressure Sensor US$24.50 )
- SenSym/Honeywell SX15DD4 ( 0 to 15 PSI Differential Pressure Sensor US$19.88 )
Datasheet: [2] (http://content.honeywell.com/sensing/prodinfo/pressure/008136_1_w.pdf) (pdf)
Resources:
Notes:
Media
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External links & references
- Bicking, Robert E. (Honeywell), 2005. Fundamentals of pressure sensor technology (http://www.sensorsmag.com/articles/1198/fun1198/main.shtml), Sensors Online.
- Wikipedia: Manometer
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