MQ-3B alcohol sensor Introduction: The gas sensing material used in MQ-3B alcohol gas sensor is Tin(IV) oxide (SnO2) with low conductivity in clean air. When there is alcohol vapor in the environment where the alcohol sensor is located, the conductivity of the gas sensor increases with the increase of alcohol gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. The MQ-3B semiconductor alcohol sensor has high sensitivity to alcohol and can resist interference from gasoline, smoke, and water vapor. This gas sensor can detect various concentrations of alcohol atmosphere and is a low-cost sensor suitable for various applications. Mainly used in automotive alcohol gas alarms, industrial alcohol gas alarms, and portable gas detectors Features: 1. High sensitivity to alcohol 2. It can resist interference from gasoline, smoke, and water vapor 3. Long lifespan, low cost, and simple driving circuit Technical parameters: Product model: MQ-3B alcohol sensor Product type: Semiconductor gas sensor Standard packaging: plastic packaging Detection gas: alcohol vapor Detection concentration: 25-500ppm alcohol Standard circuit conditions: Circuit voltage: Vc ≤ 24V DC Heating voltage: VH 5.0V ± 0.1V AC or DC Load resistance: RL adjustable Characteristics of gas sensing components under standard test conditions: Heating resistance: RH 29 ± 3 Ω (room temperature) Heating power consumption: PH ≤ 900mW Output voltage: Vs 2.5V-4.0V (in 125ppm alcohol) Sensitivity: S Ro (in air)/Rs (125ppm alcohol) ≥ 5 Concentration slope: α ≤ 0.6 (R300ppm/R50ppm alcohol) Standard test conditions: temperature and humidity: 20 ℃± 2 ℃; 55% ± 5% RH Standard test circuit: Vc: 5.0V ± 0.1V; VH: 5.0V ± 0.1V Preheating time: not less than 48 hours Oxygen content: 21% (not less than 18%, oxygen concentration can affect the initial value, sensitivity, and repeatability of the sensor. Please consult when using at low oxygen concentration) Life: 10 years
Introduction: The gas sensing material used in MQ-3B alcohol gas sensor is Tin(IV) oxide (SnO2) with low conductivity in clean air. When there is alcohol vapor in the environment where the alcohol sensor is located, the conductivity of the gas sensor increases with the increase of alcohol gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. The MQ-3B semiconductor alcohol sensor has high sensitivity to alcohol and can resist interference from gasoline, smoke, and water vapor. This gas sensor can detect various concentrations of alcohol atmosphere and is a low-cost sensor suitable for various applications. Mainly used in automotive alcohol gas alarms, industrial alcohol gas alarms, and portable gas detectors
