MQ135-Air Quality Gas Sensor Module

The MQ135 Air Quality Gas Sensor Module is a versatile sensor designed to detect various gases and pollutants in the air. It’s widely used for air quality monitoring systems to measure the concentration of gases like ammonia (NH₃), nitrogen oxides (NOx), benzene (C₆H₆), alcohol, and smoke. This sensor is primarily used in indoor environments to monitor the air quality, ensuring it remains safe and healthy. Key Features: Gas Detection: The MQ135 sensor is highly sensitive to a wide range of gases including ammonia (NH₃), nitrogen oxides (NOx), benzene (C₆H₆), alcohol (CH₃OH), smoke, and other volatile organic compounds (VOCs), which makes it ideal for air quality monitoring in both homes and industrial settings. Analog Output: The MQ135 sensor provides an analog output that varies in voltage according to the concentration of the gases in the air. This allows for continuous air quality monitoring and analysis. Digital Output: The sensor also offers a digital output that can be used to trigger alarms or activate control systems when the concentration of gases exceeds a preset threshold. Low Power Consumption: The MQ135 operates with minimal power, making it ideal for battery-powered applications or continuous monitoring in a wide range of devices. Preheating Time: Like other sensors in the MQ series, the MQ135 requires a warm-up period of about 1-2 minutes to stabilize and provide accurate readings. Wide Detection Range: The MQ135 can detect gas concentrations in the range of 10-1000 ppm (parts per million) for most of the gases it is sensitive to. How It Works: The MQ135 operates based on a metal oxide semiconductor (MOS) that reacts with various gases when they come into contact with the sensor’s heated surface. The sensor has an internal heating element that needs to reach a specific temperature before it can function correctly. When gases such as ammonia or benzene interact with the sensor, they cause a chemical reaction that changes the electrical resistance of the sensor. The change in resistance is then translated into an output voltage that corresponds to the concentration of the detected gas. The output can be read by a microcontroller, such as Arduino or Raspberry Pi, for monitoring air quality in real-time. The analog output allows for a precise measurement of gas concentration, while the digital output can be used to trigger alarms or take corrective actions when gas levels exceed safe limits. Applications: Air Quality Monitoring: The MQ135 sensor is ideal for indoor air quality monitoring in homes, offices, schools, and hospitals, where pollutants like benzene, ammonia, and smoke can negatively affect health. Industrial and Commercial Air Quality: It is used to monitor air quality in industrial and commercial spaces, particularly in places where VOCs, nitrogen oxides, and ammonia are produced. HVAC Systems: The MQ135 can be integrated into HVAC systems (heating, ventilation, and air conditioning) to continuously monitor and adjust air quality. Environmental Monitoring: It is used in environmental monitoring stations to track pollutants in the air, particularly in urban areas or near factories. Smart Home Applications: Can be used in smart home systems to ensure that the air inside homes remains healthy, activating air purifiers, fans, or ventilation systems when needed. Pollution Detection: Helps detect harmful levels of air pollution, triggering alarms to alert people to take action, such as closing windows or using air purifiers. Technical Specifications: Operating Voltage: 5V DC (typical). Sensor Resistance: The resistance of the sensor element changes based on the concentration of gases, usually measured in kilo-ohms. Sensitivity Range: Detects gases in the range of 10-1000 ppm, depending on the specific gas. Response Time: Fast response time (typically a few seconds), although it requires a 1-2 minute warm-up period for accurate readings. Heater Resistance: Typically around 33Ω (may vary slightly depending on the manufacturer). Module Features: Analog Output: Provides a continuous output that corresponds to the concentration of gases in the air. Digital Output: Provides a high/low output signal that can be used to trigger alarms or control systems. Preheating Time: The internal heating element requires 1-2 minutes to stabilize before accurate readings can be obtained. The MQ135 Air Quality Gas Sensor Module is an excellent solution for monitoring the presence of harmful gases and pollutants in the air. Its wide detection range, low power consumption, and ease of integration with microcontrollers like Arduino or Raspberry Pi make it perfect for DIY projects, air quality monitoring systems, and smart home automation solutions. Package Includes: 1Piece- MQ135-Air Quality Gas Sensor Module