The sensing element is made of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater.
In the presence of the gas to detect, sensor conductivity increases according to the gas concentration in the air.
A simple electrical circuit can convert the change in conductivity to an output signal which corresponds to the gas concentration.
Gas sensor with high sensitivity to low concentrations of odorous gases such as amine-series and sulfurous odors generated from waste materials or rotten food.
The range is 1-10ppm of ethanol.