Overview
The gas sensitive material used in MQ-7 gas sensor is SnO2, which is of lower electrical conductivity in clean air. It detects carbon monoxide with low temperature (heated by 1.5V) through high-low temperature cycles. The electrical conductivity of the sensor increases with the increase of the carbon monoxide concentration in the air. The change of electrical conductivity can be converted to the output signal corresponding to that of the gas concentration by using a simple circuit. The.
Features
- good sensitivity to carbon monoxide.
- long service life, low cost
- simple drive circuit
Specifications
- SKU: KS0045
- Target Gas: carbon monoxide
- Detectable Concentration: 300-10000ppm CO
- l Loop voltage Vc: ≤10V DC
- 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)
Tutorials
Wiring and sample code are in the Keyestudio Wiki.
