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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.
Aneroid barometers are often used for reading pressure in homes and recreational boats. Other uses may include barographs in meteorology and altimeters in modern aircraft. Aneroid barometers primarily measure whether pressure is rising or falling. This type of barometer can announce whether a high or low pressure system is coming or whether it is becoming more intense. There are different types of aneroid barometers, such as the altimeter, which measures altitude, or distance above sea level. Another example is a barograph, which is a modified aneroid barometer that provides constant readings of atmospheric pressure on graph paper. When used in this capacity, the aneroid barometer can store a week's worth of data.