Compact size For breath alcohol testers and solvent detectors - Figaro Engineering - #1

Jfigaro

product information

tgs 2620 - for the detection of solvent vapors

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. It also has sensitivity to a variety of combustible gases such as carbon monoxide, making it a good general purpose sensor.

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 figure below represents typical sensitivity characteristics, all data having been gathered at standard test conditions (see reverse side of this sheet). The Y-axis is indicated as sensor ressstance ratoo (Rs/Ro) which is defined as follows:

Rs = Sensor resistance in displayed gases at various concentrations

Ro = Sensor resistance in 300ppm of ethanol

sensitivity characteristics:

The figure below represents typical temperature and humidity dependency characteristics. Again, the Y-axis is indicated as sensor ressstance ratoo (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:

10

100

10

o sí

o

t/5 al

1

0

0.1

10

100 1000

Gas concentration (ppm)

10000

-20 -10 0 10 20 30 ambient temperature (°c)

40

50

important note: operating conditions in which figaro sensors are used will vary with each customer's specific applications. figaro strongly recommends consulting our technical staff before deploying figaro sensors in your application and, in particular, when customer's target gases are not listed herein. figaro cannot assume any responsibility for any use of its sensors in a product or application for which sensor has not been specifically tested by figaro.