Correlation method of compensating the zero temperature-drift of four-electrode low-range electrochemical NO2 and SO2 gas concentration sensors

In the paper was presented a method of compensating for the temperature drift of the zero component of four-electrode low-range electrochemical sensors of gas concentration: nitrogen dioxide and sulfur dioxide. The method is based on a long-term series of measurement results from these sensors. Statistical analysis of the results at changing ambient temperature enables the identification of temperature drift baseline that is unique for a given sensor unit. The accuracy of the curve estimation was additionally increased by using a series of results from standard measures in the validation process. The proposed method is to facilitate the use of electrochemical sensors for the construction of cheap and portable detectors of nitrogen dioxide and sulfur dioxide concentrations included in the atmospheric air.