Product Introduction
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MQ-3 Alcohol Sensor Product Description
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The gas-sensitive material used in the MQ-3 alcohol sensor is tin dioxide (SnO2) with low conductivity in clean air. When alcohol vapor is present in the environment, the sensor's conductivity increases with the concentration of alcohol gas in the air. A simple circuit can convert the change in conductivity into an output signal corresponding to the gas concentration.
The MQ-3 semiconductor sensor has high sensitivity to alcohol and can resist interference from gasoline, smoke, and water vapor. This sensor can detect various concentrations of alcohol atmospheres and is a low-cost sensor suitable for multiple applications.
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MQ-3 Alcohol Sensor Features
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* Good sensitivity to alcohol gas
* Long life, low cost
* Simple drive circuit required
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MQ-3 Alcohol Sensor Main Applications
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* Vehicle alcohol gas alarms
* Portable alcohol gas detectors
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MQ-3 Alcohol Sensor Technical Specifications
| Product Model | MQ-3 | ||
| Product Type | Semiconductor gas-sensitive element | ||
| Standard Package | Bakelite (black bakelite), plastic encapsulation | ||
| Detection Gas | Alcohol vapor | ||
| Detection Concentration | 25-500ppm alcohol | ||
| Standard Circuit Conditions | Loop Voltage | Vc | ≤24V DC |
| Heating Voltage | VH | 5.0V±0.1V ACorDC | |
| Load Resistance | RL | Adjustable | |
| Gas-sensitive Element Characteristics under Standard Test Conditions | Heating Resistance | RH | 29±3Ω (room temperature) |
| Heating Power Consumption | PH | ≤900mW | |
| Output Voltage | Vs | 2.5-4.0V (in 125ppm alcohol) | |
| Sensitivity | S | Rs(in air)/Rs(125ppm alcohol)≥5 | |
| Concentration Slope | α | ≤0.6(R300ppm/R125ppmalcohol) | |
| Standard Test Conditions | Temperature, Humidity | 20℃±2℃；55%±5%RH | |
| Standard Test Circuit | Vc：5.0V±0.1V VH：5.0V±0.1V |
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| Preheat Time | No less than 48 hours | ||
