Sensor Boards And Modules
MQ 2 Gas Sensor Module
The MQ 2 gas sensor module is an electronic sensor used for detecting the concentration of gases in the air, such as LPG, propane, methane, hydrogen, alcohol, smoke, and carbon monoxide. It’s also known as a chemiresistor because its sensing material changes resistance when exposed to gas
₹85.00 exc. GST
The MQ 2 gas sensor module is a versatile and widely used sensor designed to detect the concentration of various gases in the air. Here’s a detailed description:
Working Principle:
The MQ 2 gas sensor module is a metal oxide semiconductor (MOS) type sensor, also known as a chemiresistor. It contains a sensing material, typically aluminum oxide (Al2O3) coated with tin dioxide (SnO2), which changes its resistance when exposed to gases. When the sensor is heated, oxygen molecules adsorb on the surface of the sensing material1. In the presence of reducing gases (like LPG, methane, hydrogen, etc.), these oxygen molecules react with the gases, reducing the surface density of adsorbed oxygen and allowing current to flow through the sensor. The resulting analog voltage values are measured to determine the concentration of the gas.
Key Features:
Operating Voltage: 5V DC
Detection Range: 200 to 10,000 ppm (parts per million)
Output: Analog voltage (0-5V) and digital output (TTL logic)
Preheat Duration: Approximately 20 seconds
Sensitivity: Can be adjusted using a potentiometer
Applications:
Air Quality Monitoring: Detecting harmful gases in the environment.
Gas Leak Detection: Used in homes and industries to detect gas leaks.
Fire Detection: Early detection of smoke and fire.
Safety Systems: Ensuring safety in sensitive environments like hospitals.
Environmental Monitoring: Maintaining environmental standards.
Limitations:
Non-Specific: The MQ-2 sensor cannot distinguish between different gases; it only detects their presence.
Accuracy: While effective for detecting gas presence, it is not suitable for precise measurement of gas concentrations without additional calibration.





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