A microcontroller-based gas sensing system is presented in this paper. The poor selectivity of SnOl sensors is improved by the consideration of temperature variation. The analysis presented here exploits the differences in the steady-state performance of SnOl gas sensors and the potential use of such differences yor improving their selectivity and sensitivity. Sets of experimental measurements of sensitivity versus temperature are used f o r the detailed presentation of this technique. The results shown here'indicate that selective identification and accurate measurement of a mixture of
CH, and CO gases is quite possible by this method.
Finally, a microcontroller-based configuration is presented as . a working example of a small size implementation, which may offer measurements of improved sensitivity and selectivity along with high accuracy and reliability.
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