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TGS2442 fiches techniques PDF

ETC - Detection of Carbon Monoxide

Numéro de référence TGS2442
Description Detection of Carbon Monoxide
Fabricant ETC 
Logo ETC 





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TGS2442 fiche technique
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PRODUCT INFORMATION
TGS 2442 - for the detection of Carbon Monoxide
Features:
* Low power consumption
* High sensitivity/selectivity to
carbon monoxide (CO)
* Miniature size
* Low sensitivity to alcohol vapor
* Long life and low cost
* Low humidity dependency
Applications:
* CO detectors
* Air quality controllers
* Indoor parking lot ventilation
TGS 2442 utilizes a multilayer sensor structure. A glass layer for thermal insulation
is printed between a ruthenium oxide (RuO2) heater and an alumina substrate. A
pair of Au electrodes for the heater are formed on a thermal insulator. The gas sensing
layer, which is formed of tin dioxide (SnO2), is printed on an electrical insulation layer
which covers the heater. A pair of Au electrodes for measuring sensor resistance
are formed on the electrical insulator. Activated charcoal is filled between the internal
cover and the outer cover for the purpose of reducing the influence of noise gases.
TGS 2442 displays good selectivity to carbon monoxide, making it ideal for CO
monitors. In the presence of CO, the sensor's conductivity increases depending on
the gas concentration in the air. A simple pulsed electrical circuit operating on a one
second circuit voltage cycle can convert the change in conductivity to an output signal
which corresponds to gas concentration.
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 100ppm CO
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 30ppm, 100ppm and 300ppm
of CO at various temperatures and 50%R.H.
Ro = Sensor resistance at 300ppm of CO
at 25°C and 50% R.H.
Sensitivity Characteristics:
100
Air
Ethanol
Temperature/Humidity Dependency:
1000
50%RH
10 100
H2
Air
1 10
0.1 CO 1
CO 30ppm
CO 100ppm
0.01
1
10 100 1000
Gas Concentration (ppm)
10000
CO 300ppm
0.1
-20 -10 0 10 20 30 40 50 60
Temperature (˚C)
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.

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