Datasheet

PRODUCT INFORMATION
PRODUCT INFORMATION
0.1
1
10
-20 -10 0 10 20 30 40 50
Rs/Ro
Ambient Temperature (°C)
2
5
.5
R.H.
35%
50%
65%
100%
0.1
1
10
100 1000
Rs/Ro
Air
Methane
Concentration (ppm)
Carbon-
monoxide
Isobutane
n-Hexane
Benzene
Ethanol
Acetone
50 500 5000
Applications:
Features:
TGS 822 - for the detection of Organic Solvent Vapors
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
resistance ratio (Rs/Ro) which is defined as follows:
Rs = Sensor resistance of displayed gases at
various concentrations
Ro = Sensor resistance in 300ppm ethanol
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 at 300ppm of ethanol
at various temperatures/humidities
Ro = Sensor resistance at 300ppm of ethanol
at 20°C and 65% R.H.
* High sensitivity to organic solvent vapors
such as ethanol
* High stability and reliability over a long
period
* Long life and low cost
* Uses simple electrical circuit
* Breath alcohol detectors
* Gas leak detectors/alarms
* Solvent detectors for factories, dry
cleaners, and semiconductor
The sensing element of Figaro gas sensors is a tin dioxide (SnO2) semiconductor
which has low conductivity in clean air. 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 822 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. Also available with a
ceramic base which is highly resistant to severe environments as high as 200°C
(model# TGS 823).
Temperature/Humidity Dependency:
Sensitivity Characteristics:
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.