Product Introduction
The gas sensing material used in MQ-9 gas sensors is tin dioxide (SnO2) with low conductivity in clean air. We use a high-low temperature cycle detection method to detect carbon monoxide at low temperatures (1.5V heating). The conductivity of the sensor increases with the concentration of carbon monoxide gas in the air. At high temperatures (5.0V heating), we detect combustible gases such as methane and propane and clean the stray gases adsorbed at low temperatures. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit. The MQ-9 gas sensor has high sensitivity to carbon monoxide, methane, and liquefied gas. This sensor can detect various gases containing carbon monoxide and flammability, making it a low-cost sensor suitable for multiple applications.
Product Parameter
| 产品型号 Product model | MQ-9 | ||
| 产品类型 Product type | 半导体气敏元件 Semiconductor gas sensing components | ||
| 标准封装 Standard packaging | 胶木 Rubberwood | ||
| 检测气体 Gas detection | 一氧化碳、可燃气体 CO、combustible gases | ||
| 检测浓度 Detect concentration | 10-1000ppmC0; 100-10000ppm燃气（gas） | ||
| 标准电路条件 Standard circuit conditions | 回路电压 Circuit voltage | Vc | ≤10V DC |
| 加热电压 Heating voltage | VH | 5.0V±0.2V ACorDC(high) | |
| 1.5V士0.1V ACorDC(low) | |||
| 加热时间 Heating time | TL | 60士1S(high) 90士1S(low) | |
| 负载电阻 Load resistance | RL | Adjustable | |
| 标准测试条件下元件特性 Component characteristics under standard testing conditions | 加热电阻 Heating resistor | RH | 31Ω±3Ω（room temperature） |
| 加热功耗 Heating power consumption | PH | About 350mW | |
| 敏感体表面电阻 Surface resistance of sensitive body | RS | 2K Ω -20K Ω (in100ppmC0) | |
| 灵敏度 Sensitivity | S | Rs (in air)/Rs(100ppmC0)≥5 | |
| 浓度斜率 Concentration slope | ɑ | ≤0.6(R300ppm/R100ppmCO) | |
| 标准测试条件 | 温度、湿度 Temperature and humidity | 20℃士2℃;65%士5%RH | |
| 标准测试电路 Standard Test Circuit | Vc:5.0V±0.1V VH（high）：5.0V±0.1V VH（low）：1.5V±0.1V | ||
| 预热时间 Preheating time | Not less than 48 hours | ||
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