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    MQ-138 Formaldehyde HCHO & VOC Gas Sensor Module with Alarm Signal Light Robotics Bangladesh
    • MQ-138 Formaldehyde HCHO & VOC Gas Sensor Module with Alarm Signal Light Robotics Bangladesh

    MQ-138 Formaldehyde HCHO & VOC Gas Sensor Module with Alarm Signal Light

    RBD-3780

    The MQ-138 Gas Sensor Module is a highly sensitive, low-cost solution for detecting formaldehyde (HCHO), volatile organic compounds (VOCs), and other harmful gases in indoor and industrial environments. Manufactured by Winsen Electronics, the MQ-138 uses a SnO₂ (tin dioxide) semiconductor sensing material, which changes conductivity in response to the presence of organic vapors.

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    Description

    Product Description

    The MQ-138 Gas Sensor Module is a highly sensitive, low-cost solution for detecting formaldehyde (HCHO), volatile organic compounds (VOCs), and other harmful gases in indoor and industrial environments. Manufactured by Winsen Electronics, the MQ-138 uses a SnO₂ (tin dioxide) semiconductor sensing material, which changes conductivity in response to the presence of organic vapors.

    With excellent sensitivity to toluene, acetone, alcohol, methanol, hydrogen, and other organic gases, this module is widely used in air quality monitoring, VOC gas alarms, industrial leakage detection, and portable air detectors. It features an alarm signal light for instant gas detection feedback, making it a practical choice for both professional and DIY air monitoring applications.

    Technical Specifications

    • Model: MQ-138

    • Sensor Type: Semiconductor gas sensor

    • Encapsulation: Bakelite with metal cap

    • Target Gases: Formaldehyde (HCHO), toluene, acetone, alcohol, methanol, hydrogen, and organic vapors

    • Detection Range: 5 – 500 ppm

    • Loop Voltage (Vc): ≤ 24V DC

    • Heater Voltage (Vh): 5.0V ± 0.1V (AC or DC)

    • Heater Resistance (Rh): 29Ω ± 3Ω (room temperature)

    • Heater Consumption (Ph): ≤ 900 mW

    • Load Resistance (RL): Adjustable

    • Sensitivity (S): Rs (in air) / Rs (in 50 ppm toluene) ≥ 2

    • Output Voltage (△Vs): ≥ 0.5V (in 50 ppm toluene)

    • Concentration Slope (α): ≤ 0.6 (R200ppm / R50ppm toluene)

    • Standard Test Conditions: 20℃ ± 2℃, 55% ± 5% RH

    • Operating Circuit: Vc 5.0V ± 0.1V; Vh 5.0V ± 0.1V

    • Preheat Time: > 48 hours

    Key Features

    • High sensitivity to formaldehyde (HCHO) and volatile organic compounds (VOCs)

    • Reliable detection of toluene, acetone, alcohol, methanol, hydrogen, and other gases

    • Low-cost solution for multi-gas monitoring applications

    • Adjustable load resistance for calibration flexibility

    • Alarm signal light for real-time detection feedback

    • Suitable for both domestic and industrial applications

    Applications

    • Indoor air quality monitoring systems

    • VOC gas alarms for households and workplaces

    • Industrial gas leakage alarms and safety systems

    • Portable VOC/formaldehyde detectors

    • Environmental monitoring and IoT-based sensor networks

    Package Includes

    • 1 × MQ-138 Formaldehyde HCHO & VOC Gas Sensor Module with Alarm Signal Light

    Why Choose This Sensor?

    The MQ-138 module combines sensitivity, reliability, and affordability in a compact design. With its ability to detect a wide range of harmful gases and provide real-time feedback, it is an excellent choice for developers, makers, and engineers building air quality monitoring and safety systems.

    Monitor air quality and detect harmful VOCs effectively with the MQ-138 Gas Sensor Module – a reliable, affordable, and versatile solution for clean and safe environments.

    Product Details
    RBD-3780
    4 Items

    Specific References

    EAN13
    3780
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