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 ammonia and H2S generated from waste materials in office and home environments and to low concentrations of VOCs such as toluene emitted from wood finishing and construction products.
The sensor is housed in a standard TO-5 case. Due to the miniaturized sensing chip, the heater requires a current of only 56mA.
The range is 1-30ppm of ethanol.