MQ-9 Carbon Monoxide, Combustible Gas Sensor Module
The MQ-9 Carbon Monoxide, Combustible Gas Sensor Module is designed for detecting carbon monoxide (CO) and combustible gases such as methane (CH₄), propane (C₃H₈), and liquefied petroleum gas (LPG). Utilizing a sensitive SnO₂ semiconductor material, the sensor exhibits lower conductivity in clean air and higher conductivity in the presence of target gases. It operates by cycling between high and low temperatures to detect different gases: low temperature (1.5V) for CO detection and high temperature (5.0V) for combustible gases. The module provides both analog and digital outputs, with an adjustable sensitivity via an onboard potentiometer, making it suitable for various gas detection applications.
Features
- High sensitivity to carbon monoxide, methane, propane, and LPG.
- Fast response time and stable performance.
- Dual analog and digital output options.
- Adjustable sensitivity through onboard potentiometer.
- Simple drive circuit for easy integration.
- Long operational life and low cost.
Specification
| Parameter | Value |
|---|---|
| Operating Voltage | 5VDC |
| Heater Voltage (High) | 5.0V±0.2V AC or DC |
| Heater Voltage (Low) | 1.5V±0.1V AC or DC |
| Heater Resistance | 31Ω±3Ω |
| Heater Consumption | ≤350mW |
| Detection Range (CO) | 10–1000ppm |
| Detection Range (CH₄/LPG) | 100–10000ppm |
| Analog Output Voltage | 0–5V |
| Digital Output Voltage | 0V or 5V (TTL Logic) |
| Preheat Time | ≥24 hours |
| Operating Temperature | -10°C to 50°C |
| Operating Humidity | 20% to 90% RH |
| Dimensions | 32mm x 20mm |
PINOUT
- VCC power supply 5V
- GND ground connection
- AO – Analog output
- DO – Digital Output
Applications
- Domestic gas leakage detectors.
- Industrial gas detection systems.
- Portable gas detectors.
- Smart home safety devices.
- Environmental monitoring systems.
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