Alcohol sensor

Features:

* Low power consumption
* High sensitivity to alcohol and organic
solvent vapors
* Long life and low cost
* Uses simple electrical circuit

Applications:

* Alcohol testers
* Organic vapor detectors/alarms
* Solvent detectors for factories, dry cleaners,and semiconductor industries

The sensing element is comprised of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater. In the presence of a detectable gas, the sensor's conductivity increases depending on 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 TGS 2620 has high sensitivity to the vapors of organic solvents as well as other volatile vapors, making it suitable for organic vapor detectors/alarms. Due to miniaturization of the sensing chip, TGS 2620 requires a heater current of only 42mA and the device is housed in a standard TO-5 package. 

The sensing element is comprised of a metal oxide semiconductor layer formed on an alumina substrate of a sensing chip together with an integrated heater. In the presence of a detectable gas, the sensor's conductivity increases depending on 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 TGS 2620 has high sensitivity to the vapors of organic solvents as well as other volatile vapors, making it suitable for organic vapor detectors/alarms. Due to miniaturization of the sensing chip, TGS 2620 requires a heater current of only 42mA and the device is housed in a standard TO-5 package.

Sensitivity Characteristics:

The figure below represents typical temperature and humidity dependency characteristics. Again, the Y-axis is indicated as sensor resistance ratio (Rs/Ro), defined as follows:
Rs = Sensor resistance in 300ppm of ethanol at various temperatures/humidities
Ro = Sensor resistance in 300ppm of ethanol at 20°C and 65% R.H.

Temperature/Humidity Dependency:

Specifications