Dual gas detection with one sensor For residential gas detectors - Figaro Engineering - #1

figaro

PRODUCT INFORMATION

tgs 3870 - for the detection of both Methane and Carbon Monoxide

*

Miniature size and low power consumption High sensitivity and selectivity to both

methane and carbon monoxide (CO) Low sensitivity to alcohol vapor Long life and low cost

* Combination methane and carbon monoxide detectors

*

tgs 3870 is Figaro's new metal oxide semiconductor gas sensor for the detection of both methane and carbon monoxide. Using a micro-bead gas sensing structure, both methane and carbon monoxide can be detected with a single sensor element by periodic application of two different heater voltages (high and low). Miniaturization of the gas sensing bead results in a heater power consumption of only 38mW (average).

tgs 3870 has low sensitivity to alcohol vapors (a typical interference gas in the residential environment) and has high durability, making the sensor ideal for consumer market gas alarms.

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 3000ppm of methane

sensitivity characteristics (methane):

100

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 100ppm of CO

sensitivity characteristics (co):

1000

100

10

o 9; OC

o 9c

7/5

10

0.1

0.1

10

100 1000 10000

Gas concentration (ppm)

100000

10

100 1000

Gas concentration (ppm)

10000

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.