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Sensor calibrations should be executed annually by an engineering specialist. UMS offers the complete service for pressure, O2- and CO2 sensors as well as the recalibration and testing of the internal electronics (see chapter Replacement parts and accessories). 7.4.1 Calibration parameters With the calibration parameters the digital sensor specifications of the BaPS interface are adjusted to the physical units. Please change these parameters only if you have adequate knowledge of the correlations. The calibration parameters for your BaPS are back-upped in a special txt-file. The parameters are taken over during the installation. The sensor parameters can be viewed by calling up the menu "Calibration" ⇐ "Sensor specifications “. 7.4.1.1 Polynomial conversion The sensor readings are converted to physical values with the use of polynomials, maximum grade 4. Enter the factors for each polynomial into the first column. 62