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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.
Again, for a sensor that measures absolute gas concentration but is calibrated to read out in relative units, this results in an apparent O 2 increase. In this example, 0.247 % O 2 for every 1 kPa increase in barometric pressure (0.0118 * 20.95 % = 0.243 %) and an apparent relative O 2 concentration of 21.193 %.A barometric pressure correction should be applied to all O 2 sensors that are calibrated to read relative O 2 concentration.A), the percentage increase in absolute gas concentration per kPa increases with elevation. For example, at an elevation of 1358 m (Logan, Utah), the barometric pressure is approximately 86 kPa and the absolute gas concentration increases by 1.16 % for every 1 kPa increase in pressure (1 kPa / 86.0 kPa = 0.0116).