In modern industry and daily life, carbon monoxide (CO), a colorless and odorless toxic gas, has become a significant threat to human safety. Whether it's a gas leak in a home or the potential accumulation of CO during industrial production, reliable and efficient gas detection methods are essential for early warning and protection. Against this backdrop, Tensensor's MQ-K7B carbon monoxide gas sensor, with its superior performance, flexible application adaptability, and excellent cost-effectiveness, has become a star product in the gas detection field.

MQ-K7B Semiconductor CO Sensor

Product Overview: Semiconductor Technology-Driven Intelligent Sensing

    The MQ-K7B is a gas sensor developed based on a semiconductor gas-sensitive material (tin dioxide, SnO₂). Its working principle is based on the material's characteristic of low conductivity in clean air, which significantly increases upon contact with carbon monoxide. Through high and low temperature cycling detection technology, the sensor achieves CO detection at low temperatures (1.5V heating) and completes gas purging and recovery at high temperatures (5.0V heating), offering the dual advantages of high sensitivity and long lifespan.

    This sensor uses a standard plastic encapsulation, featuring a compact structure and easy installation. It is suitable for embedded integration and modular design, and can be widely used in various gas detection systems.

Core Advantages: High Sensitivity, Strong Stability, and Controllable Cost

    1. Wide Concentration Range Detection Capability

    The MQ-K7B can stably detect carbon monoxide concentrations ranging from 10 to 500 ppm. Its sensitivity ratio (Rs(in air)/Rs(in 150ppm CO)) is no less than 5, especially for 150 ppm CO, demonstrating a clear response and suitability for multi-level concentration warning needs from residential to industrial applications.

    2. Dual Voltage Operating Mode

    The sensor supports dual voltage operation at both high and low temperatures. It uses 1.5V for low-temperature detection and 5.0V for high-temperature cleaning, ensuring both high sensitivity and extended sensor lifespan, reducing long-term maintenance costs.

    3. Good Environmental Adaptability

    Under standard testing conditions (20℃±2℃, 55%±5%RH), the sensor exhibits stable output characteristics. Furthermore, the product has a certain degree of temperature and humidity compensation capability, making it suitable for various practical application environments.

    4. Simple and easy-to-integrate driving circuit: Only basic peripheral circuitry (adjustable load resistor) is needed to convert the sensor resistance change into a voltage signal output, which greatly reduces the difficulty and cost of system development.

Typical Application Scenarios

    1. Home Carbon Monoxide Alarm

    Suitable for gas water heaters, wall-hung boilers, kitchen gas alarms, etc., promptly detecting CO leaks and ensuring home safety.

    2. Industrial Safety Monitoring System

    Can be used as a fixed CO monitoring device in factory workshops, mines, underground garages, etc., to achieve real-time monitoring and early warning of toxic gas concentrations.

    3. Portable Gas Detector

    With its small size and low power consumption, the MQ-K7B is also very suitable for integration into handheld detection devices for on-site inspections and environmental assessments.

    The MQ-K7B carbon monoxide gas sensor, with its comprehensive advantages of high sensitivity, long lifespan, easy integration, and low cost, is an ideal choice for CO detection applications. Please feel free to contact us if you have any needs：

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