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MQ9 Carbon Monoxide & Combustible Gas Sensor Module
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Rs.450.00
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Rs.450.00
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MQ9 Carbon Monoxide & Combustible Gas Sensor Module
The MQ9 is a dual-function gas sensor that detects both Carbon Monoxide (CO) and combustible gases like LPG and methane (CH4). It uses a SnO2 sensing element with a built-in heater that operates in two alternating cycles — high temperature for CO detection and low temperature for combustible gas detection. Ideal for home safety alarms, industrial monitoring, and gas leak detection systems with Arduino or ESP32.
Technical Specifications
| Parameter | Value |
|---|---|
| Supply Voltage | 5V DC |
| Heater Voltage | 5V ±0.1V |
| Output Type | Analog (AO) + Digital (DO) |
| Target Gases | CO, CH4, LPG (combustible gases) |
| CO Detection Range | 10 – 1000 ppm |
| LPG/CH4 Detection Range | 100 – 10000 ppm |
| Preheat Time | ~20 seconds (minimum) |
| Operating Temperature | -20°C to +70°C |
| Operating Humidity | Less than 95% RH |
Pinout
| Pin | Name | Description |
|---|---|---|
| VCC | Power | 5V Supply |
| GND | Ground | Ground |
| DO | Digital Output | HIGH when gas exceeds threshold (adjustable) |
| AO | Analog Output | Voltage proportional to gas concentration |
Key Features
- Dual detection: Carbon Monoxide (CO) and combustible gases (LPG, CH4)
- Dual output: analog for concentration, digital for threshold alarm
- Adjustable sensitivity via onboard potentiometer
- Power and alarm indicator LEDs
- Compatible with Arduino, ESP32, STM32, PIC
Applications
- Home CO safety alarms and detectors
- LPG and natural gas leak detection
- Industrial combustible gas monitoring
- Kitchen and boiler room safety systems
- Vehicle cabin air quality monitoring