CO and Methane Detection
Covers 10–500 ppm CO and 300–10,000 ppm CH4.
MQ-9B Semiconductor Carbon Monoxide and Methane Sensor
The MQ-9B is a SnO₂ semiconductor sensor for carbon monoxide and methane. Its cyclic heater detects CO during low-temperature operation and supports methane response during the high-temperature phase.
BrandWinsen
Sensing PrincipleSemiconductor
Target GasCO, CH4
Product TypeSemiconductor CO and CH4 Gas Sensor
Gas Sensing for OEM Integration
Product Overview
A dual-gas semiconductor sensor for CO and CH4 leakage alarms in residential and industrial equipment.
Sensor conductivity rises as the concentration of carbon monoxide or methane increases and can be converted into an electrical output through a simple circuit.
Its wide methane range, CO sensitivity, long life and low component cost suit household, kitchen, industrial and portable alarms.
Designed for Reliable Integration
Key Features
Cyclic Temperature Method
Uses high- and low-temperature heater phases for detection and surface cleaning.
Simple Analog Circuit
Conductivity can be measured with an adjustable load resistance.
High-Volume Alarm Design
A mature semiconductor structure supports cost-sensitive products.
10-Year Life
Official specification lists a 10-year lifespan.
Wide CH4 Range
Supports methane leakage detection up to 10,000 ppm.
Typical Use Cases
Applications
Household Gas Leakage Alarms
Kitchen Safety Equipment
Industrial CO and CH4 Alarms
Portable Gas Detectors
Official Product Parameters
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | MQ-9B |
| Sensor Type | Semiconductor, SnO₂ |
| Standard Encapsulation | Plastic cap |
| Detected Gases | Carbon monoxide (CO), methane (CH4) |
| Detection Range | CO: 10–500 ppm; CH4: 300–10,000 ppm |
| Loop Voltage | 5.0±0.1 V DC |
| Heater Voltage | 5.0±0.1 V high temperature; 1.5±0.1 V low temperature |
| Heater Time | 60±1 s high temperature; 90±1 s low temperature |
| Load Resistance | Adjustable |
| Heater Resistance | 30±3 Ω at room temperature |
| Heater Consumption | ≤950 mW |
| CO Sensitivity | Rs in air / Rs in 150 ppm CO ≥5 |
| CH4 Sensitivity | Rs in air / Rs in 5000 ppm CH4 ≥3 |
| CO Output Voltage | 2.5–4.3 V in 150 ppm CO |
| CH4 Output Voltage | 2.0–4.0 V in 5000 ppm CH4 |
| Preheat Time | More than 48 hours |
| Required Oxygen Content | 21%, not less than 18% |
| Dimensions | Ø16.7 × 9.4 mm |
| Expected Life | 10 years |
Specifications are based on the official Winsen product page or product manual. Confirm the latest datasheet, calibration requirements, communication protocol and mechanical drawing before final product design.
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