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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.
Best Answer: Barometric readings show what the barometric pressure or air pressure is. Air pressure is the force exerted on you by the weight of tiny particles of air. Barometers are used to measure the current air pressure at a particular location in inches of mercury or in millibars (mb). A measurement of 29.92 inches of mercury is equivalent to 1013.25 millibars. Air pressure can tell us about what kind of weather to expect as well. If a high pressure system is on its way, often you can expect cooler temperatures and clear skies.