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A barometric pressure sensor measures pressure differences in the atmosphere. In automotive applications, this reading is used by the powertrain control module to regulate engine timing and fuel... A barometric pressure sensor measures pressure differences in the atmosphere. In automotive applications, this reading is used by the powertrain control module to regulate engine timing and fuel trim. Most barometric pressure sensors that can operate independently are usually placed on top of the firewall or the fender skirt's interior. Some devices are installed along with the manifold absolute pressure sensor or mounted on the intake manifold of the fuel system. One variation in barometric pressure sensors is the range of pressure levels these instruments can measure. The CS100 barometric pressure sensor manufactured by Setra detects fluctuations in atmospheric pressure between 600 to 1,100 millibars, while Vaisala's CS106 pressure sensor gauges pressure differences from 500 to 1,100 millibars.
The Barometric Pressure Sensor only measures atmospheric pressure. When we are at sea level, we are feeling the weight of one atmosphere on our shoulders. Remember, air has mass, therefore it weighs something. Imagine a column of air that's one square inch in area, that goes from sea level all the way to the very top of the atmosphere. The air in that column weighs about 14.7 lbs. If we were to stack this weight on top of a pressure sensor, that sensor would register 14.7 pounds per square inch, or PSI. So one atmosphere = 14.7 PSI (101.325 kPa). But the density of this air can change the weight of it some, and density is affected by things like humidity and temperature. At standard temperature and pressure, one atmosphere above sea level is equal to: These are all different units of measure, but they all do the same thing: measure pressure.