Product Description:
Sensitive material of MQ-3B gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol gas exist, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-3B gas sensor has high sensitivity to alcohol gas and can resistant to the interference of gasoline, smoke and vapour. It is with low cost and suitable for various applications of detecting alcohol at different concentration.
Technical Parameters:
| Model | MQ-3B | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Plastic cap | ||
| Target Gas | Alcohol gas | ||
| Detection range | 25~500ppm alcohol | ||
| Standard Circuit Conditions | Loop Voltage | Vc | ≤24V DC |
| Heater Voltage | VH | 5.0V±0.1V AC or DC | |
| Load Resistance | RL | Adjustable | |
| Sensor character under standard test conditions | Heater Resistance | RH | 29Ω±3Ω (room tem.) |
| Heater consumption | PH | ≤900mW | |
| Sensitivity | S | Ro(in air)/Rs(125ppm C2H5OH)≥5 | |
| Output Voltage | Vs | 2.5V~4.0V (in 125ppm C2H5OH) | |
| Concentration Slope | α | ≤0.6(R300ppm/R50ppm C2H5OH) | |
| Standard test conditions | Tem. Humidity | 20℃±2℃；55%±5%RH | |
| Standard test circuit | Vc:5.0V±0.1V VH:5.0V±0.1V | ||
| Preheat time | Over 48 hours | ||
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