Description of MQ-135 Air Quality Hazardous Gas Sensor Detector Module
Quick Overview
The MQ-135 Air Quality Hazardous Gas Sensor is designed to detect a range of harmful gases such as ammonia, sulfur dioxide, benzene vapor, smoke, and carbon dioxide. It's commonly used in air quality monitoring devices, HVAC systems, and safety measures in both industrial and consumer applications.
How It Works
The MQ-135 sensor consists of a metal oxide semiconductor layer placed on an alumina tube with an integrated heating element. When exposed to targeted gases: The sensor heats up, releasing free carriers on the semiconductor surface. These carriers react with the molecules of the detected gas. The change in surface resistance is converted into a corresponding voltage signal. This signal can be processed by a microcontroller or another analog-to-digital converter to determine the type and concentration of the gas.
Technical Specification
- Operating Voltage: 5V DC
- Output Type: Analog
- Sensing Range: Varies based on gas, typically 10-300 ppm
- Preheat Duration: 20-60 seconds
- Operating Temperature: -10°C to 50°C
- Sensing Materials: Multiple hazardous gases including CO2, NH3, benzene, and smoke
Key Features
- Multi-Gas Detection: Capable of detecting a variety of harmful gases.
- High Sensitivity: Provides a rapid and accurate response.
- Long Life Expectancy: Designed for long-term use, often up to several years.
- Easy Integration: Analog output for straightforward interfacing with microcontrollers.
- Calibration Support: Allows for sensitivity adjustments to tailor to specific applications.
Application
- Air quality monitoring systems for both indoor and outdoor environments
- HVAC systems with air quality control
- Industrial safety measures to detect hazardous gases
- Environmental data collection for research and development
- Educational STEM kits focusing on environmental science and air quality
Summary
In closing, the MQ-135 Air Quality Sensor offers a comprehensive solution for air quality monitoring. Its ability to detect various hazardous gases makes it indispensable in both environmental studies and public safety.
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