Carbon Monoxide Gas Sensor Module (MQ-7) for Arduino Keyestudio

The MQ-7 gas sensor has high sensitivity to detect carbon monoxide at low temperature (heated to 1.5V) through high-low temperature cycles. The material used in this sensor is SnO2. When there is carbon monoxide in the environment surrounding the sensor, the electrical conductivity of the sensor increases in proportion to the amount of gas. This change in electrical conductivity can be converted to the output signal corresponding to the gas concentration with just one circuit.

This sensor offers:

* good sensitivity to carbon monoxide;
* long duration at low cost;
* simple driver circuit.

May apply:

* in a domestic leak alarm;
* in an industrial-grade carbon monoxide alarm;
* on a portable gas detector.

Features

Target gas: carbon monoxide
Detectable concentration: 300-10000ppm CO
Loop voltage Vc: ≤10V DC
Heating voltage VH: 5.0V±0.2V ACorDC(hight); 1.5V±0.1V ACorDC(low)
Load resistance RL: adjustable
Heating resistance RH: 31Ω±3Ω(Room temperature)
Heating power PH: ≤350mW
Surface resistance of sensitive material R: 2KΩ-20KΩ(in100ppmCO)
Sensitivity S: Rs(in air)/Rs(100ppmCO)≥5
Concentration slope: α ≤0.6(R300ppm/R100ppm CO)
Temperature, humidity: 20℃±2℃; 65%±5%RH
Standard test circuit: Vc:5.0V±0.1V; VH(high): 5.0V±0.1V; VH(low): 1.5V±0.1V

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