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    Picture of Alcohol (Ethanol) Gas Sensor, 25~500ppm Picture of Alcohol (Ethanol) Gas Sensor, 25~500ppm

    Alcohol (Ethanol) Gas Sensor, 25~500ppm

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    SKU: SUCH-GAS-MQ3B
    $29.52
    ● Detect gas: Alcohol vapor ● Detection concentration: 25~500ppm Alcohol ● Type: Semiconductor gas sensor ● Loop voltage: VC≤24V DC
    This product has a minimum quantity of 2
    🚚 Free shipping
    🕒 Delivery date: 6-12 days
    🔁 30-day Returns
    Overview

    This alcohol gas sensor accurately monitors alcohol vapor concentrations from 25 to 500 ppm. The ethanol gas sensor uses a 5V heating voltage and consumes as little as 900mW of power, supporting integration into a variety of circuit systems. With a sensitivity ratio of ≥5 and excellent repeatability, it is widely used in breath alcohol testing, industrial alarms, and security applications.

    Feature

    • This gas sensor has high sensitivity to alcohol and is resistant to interference from gasoline, smoke, and water vapor. It can detect atmospheres with a wide range of alcohol concentrations and is a low-cost sensor suitable for a variety of applications.
    • This gas sensor has good sensitivity to alcohol over a wide concentration range. It offers advantages such as long life, low cost, and a simple driver circuit.
    • It is widely used in automotive alcohol gas alarms, industrial alcohol gas alarms, and portable gas detectors.

    Dimension (unit: mm)

    Alcohol gas sensor dimension

    Circuit Diagram

    Alcohol gas sensor circuit diagram

    Description

    The figure above shows a basic test circuit for an alcohol sensor. An alcohol gas sensor requires two voltages: a heater voltage (VH) and a test voltage (VC). VH provides the sensor with a specific operating temperature and can be supplied with either a DC or AC power supply. VRL is the voltage across the load resistor (RL) connected in series with the sensor. VC is the test voltage across the load resistor RL and requires a DC power supply.

    Long Term Observation Sensitivity Curve

    Alcohol gas sensor long terms observation sensitivity curve

    All tests in the figure were conducted under standard test conditions. The vertical axis represents observation time, and the vertical axis represents VRL value.

    Typical Tempe and Humidity Curve

    Alcohol gas sensor typical tempe and humidity curve

    The typical temperature-humidity characteristic curve of an alcohol gas sensor shows the sensor resistance ratio (RS/RSO) on the vertical axis. RS represents the sensor resistance at different temperatures and humidities in the presence of 125ppm ethanol. RSO represents the sensor resistance at 125ppm ethanol in an environment of 20°C/55% RH.

    Specs
    Product Type Semiconductor gas sensor
    Detect Gas Alcohol vapor
    Detection Concentration 25~500ppm Alcohol
    Loop Voltage VC: ≤24V DC
    Heating Voltage VH: 5.0V±0.1V AC or DC
    Load Resistance RL: Adjustable
    Heating Resistor RH: 290±30Ω (room temperature)
    Heating Power Consumption PH: ≤900mW
    Sensitivity S: R0(in air)/RS (in 125ppm Alcohol)≥5
    The Output Voltage VS :2.5V~4. 0V (in 125ppm Alcohol)
    Concentration Slope α: ≤0. 6 (R300ppm/R500ppm Alcohol)
    Temperature, Humidity 20℃±2℃, 55%±5%RH
    Standard Test Circuit VC: 5.0V±0.1V, VH: 5.0V±0.1V
    Preheat Time Not less than 48h
    Oxygen Concentration 21% (not less than 18%. Oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor. Please consult when using it under low oxygen concentration.)
    Life 10 years
    Standard Package Plastic seal
    Application
    Automotive alcohol gas alarm

    Automotive Alcohol Gas Alarm

    Industrial alcohol gas alarm

    Industrial Alcohol Gas Alarm

    Alcohol gas sensor of portable gas detector

    Portable Gas Detector

    FAQ
    ❯

    The alcohol gas sensor uses tin dioxide (SnO2), a gas-sensing material with low conductivity in clean air. When alcohol vapor is present in the sensor's environment, the sensor's conductivity increases with increasing alcohol vapor concentration. A simple circuit can convert this conductivity change into an output signal corresponding to the gas concentration.

    ❯

    Alcohol sensors are widely used in drunk driving detectors for traffic safety, alcohol concentration monitoring in wineries and chemical plants, and air quality monitoring in homes and laboratories. Some sensors are also used in smart locks and personal protective equipment to provide safety alerts. Portable devices often integrate such sensors to provide users with intuitive alcohol concentration data, ensuring personal and property safety.

    ❯

    The typical lifespan of an alcohol gas sensor is 2 to 5 years, depending on the sensor type and usage environment. To ensure long-term stability, avoid prolonged exposure to high-alcohol concentrations. Keep the environment dry and well-ventilated during use to prevent the intrusion of moisture and corrosive gases. Regular calibration and maintenance can improve detection accuracy, extend sensor life, and ensure its reliable operation in critical application scenarios.

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