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Methane and Carbon Monoxide Sensor - TGS3870

1) Target gases:Methane and Carbon Monoxide
2) rang:Methane - 500~12500 ppm ;
Carbon monoxide - 50~1000ppm
3) sensitivity (change ratio of Rs):Methane 0.50~0.65 ;
Carbon monoxide 0.1~0.6
4) Circuit Voltage:5.0±0.2V DC/AC

Model Number: TGS3870

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Product Specification

Features:

* 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

Applications:

* Combination methane and carbon monoxide detectors

Specifications

Target gases	Methane, Carbon Monoxide
Typical detection range	Methane - 500-12500 ppm Carbon monoxide - 50-1000ppm
Sensing principle	MOS type Precautions for use
Driving voltages	Heater Voltage：VHH = 0.9V(5sec.) VHL = 0.2V(15sec.) Circuit Voltage：5.0V DC pulse
Power consumption	120mW VHH = 0.9V DC 11mW VHL = 0.2V DC 38mW average
Dimensions	φ9.2×13.0mm
Weight	Approx. 1.1g

TGS 3870-B00 is a micro-bead type 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-B00 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 resistance ratio (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):