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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.
MaP sensors measure absolute pressure. Boost sensors or gauges measure the amount of pressure above a set absolute pressure. That set absolute pressure is usually 100 kPa. This is commonly referred to as gauge pressure. Boost pressure is relative to absolute pressure-as one increases or decreases, so does the other. It is a one-to-one relationship with an offset of -100 kPa for boost pressure. Thus a MaP sensor will always read 100 kPa more than a boost sensor measuring the same conditions.