MQ9 Carbon Monoxide, Methane and LPG Gas Sensor Module
Description:
MQ9 Gas Sensor Module is a versatile and highly sensitive gas detection device capable of detecting multiple combustible gases, including Carbon Monoxide (CO), Methane (CH4), and Liquefied Petroleum Gas (LPG). It is widely used in industrial and domestic applications for gas leakage detection, ensuring safety and preventing hazards due to harmful or explosive gas leaks. MQ9 sensor operates using a semiconductor sensing material (SnO₂ - Tin Dioxide), whose conductivity increases in the presence of target gases. This module is equipped with both analog and digital outputs, allowing flexible interfacing with microcontrollers like Arduino, Raspberry Pi, and other automation systems.
Features:
1. Detects Carbon Monoxide (CO), Methane (CH4), and LPG gases
2. Dual Output Mode: Analog & Digital
3. Fast response and quick recovery time
4. Adjustable sensitivity via onboard potentiometer
5. Long life and low cost
6. Built-in LM393 comparator for digital output switching
7. Dual LED Indicators (Power & Output)
8. Easy to interface with development boards
9. Suitable for indoor and industrial use
Diagram:
Specifications:
| Sensor Type | Semiconductor Gas Sensor (SnO₂) |
| Detectable Gases | Carbon Monoxide (CO), Methane (CH4), and LPG |
| Detection Range | 10 ppm ~ 10,000 ppm |
| Operating Voltage | 5V DC |
| Heating Voltage | 5V ± 0.1V |
| Response Time | ≤ 10 seconds |
| Recovery Time | ≤ 30 seconds |
| Preheat Time | ≥ 24 hours |
| Operating Temperature | -10°C to +50°C |
| Operating Humidity | 20% ~ 90% RH |
| Power Consumption | ≤ 800mW |
| Size | 32mm x 20mm x 22mm |
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