Correction of transfer curves linearity of the resistance semiconductor gas sensors

The transfer curves of gas sensors based on semiconductor sensing materials (like SiO2) usually are strongly nonlinear. The characteristics given in data sheets are not precise enough to design a transducer for gas concentration measurements, therefore an individual calibration of the sensor is needed. This paper describes a method of determination of the transfer curve for selected types of semiconductor resistive gas sensors. There is also presented an electronic conditioning device, designed to considerable improve linearity for the measuring transducer, composed of the sensor and conditioning device. This device was applied to TGS3870 sensor, which is sensitive to carbon monoxide and methane. Linearity of transfer curves is considerably better in comparison with that ones for the sensor.