A GRAPHICAL APPROACH TO ESTIMATION OF GAS CONCENTRATION WITH SnO₂ SENSORS

W. Domanski, P. Chaitas, J. Zakrzewski, Th. Laopoulos

Abstract

Electronic systems for automated monitoring of the presence of dangerous gases are available nowadays in different configurations and with quite different capabilities. This work is presenting the development of an electronic instrument for monitoring the level of two gases (namely CO and CH₄) aiming for possible use in coalmines. The instrument is using SnO₂ sensors and is based on a graphical estimation of the concentration of each of the two gases realised by a combination of the information from the calibration curves of the two sensors. In this way, instead of trying to suppress the well-known secondary sensitivity of these gas sensors, this method is estimating the two concentrations by a computerised approximation of the operating point on the calibration curves.

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IMEKO TC

TC4 - Measurement of Electrical Quantities

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