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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.
The TGS2620 has high sensitivity to the vapors of organic solvents as well as other volatile vapors.
It also has sensitivity to a variety of combustible gases such as carbon monoxide, making it a good general purpose sensor.
The sensor is housed in a standard TO-5 case.
Due to the miniaturized sensing chip, the heater requires a current of only 42mA.