Abstract
The equation describing changes of gas sensor conductance with sensor temperature and reducing gas concentration within a thermal cycle has been derived from simple kinetic expressions for basic gas/ surface interactions. Output signals of a thermally cycled Figaro #813 gas sensor for carbon monoxide, hydrogen and propane have been subsequently fitted to the derived equation. The satisfactory agreement obtained between theoretical and experimental responses implies that the shape of the output signal for a thermally cycled tin oxide gas sensor can be understood in terms of a pure kinetic model including three basic processes: adsorption, desorption and catalysed oxidation.
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