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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 altimeter is designed to measure altitude at standard sea level pressure. Since air pressure where you are flying is rarely standard, we need a method to adjust the altimeter for non-standard pressure. The altimeter is set in pressure measured in inches of mercury. The Barometric Pressure Scale is used to set the proper pressure correction. When the altitude set knob is turned, the barometric pressure scale moves along with the altimeter pointers. If the barometric pressure scale is increased the altimeter shows an increase and visa versa. The amount of movement on the scale can be an increase or decrease in altitude.