| Model | MQ-9B | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Plastic cap | ||
| Target Gas | Carbon Monoxide, Methane | ||
| Detection range | 10～500ppm CO,300～10000ppm CH4 | ||
| Standard Circuit Conditions | Loop Voltage | Vc | 5.0V±0.1V DC |
| Heater Voltage | VH | 5.0V±0.1V AC or DC (High temp.) 1.5V±0.1V AC or DC (Low temp.) | |
| Heater Time | TL | 60S±1S (High temp.)；90S±1S (Low temp.) | |
| Load resistance | RL | Adjustable | |
| Sensor character under standard test conditions | Heater Resistance | RH | 30Ω±3Ω（room temp.） |
| Heater consumption | PH | ≤950mW | |
| Sensitivity | S | Rs(in air)/Rs(in 150ppm CO)≥5 Rs(in air)/Rs(in 5000ppm CH4)≥3 | |
| Output Voltage | Vs | 2.5V～4.3V (in 150ppm CO) 2.0V～4.0V (in 5000ppm CH4) | |
| Concentration Slope | α | ≤0.6(R300ppm/R50ppmCO) ≤0.6(R5000ppm/R1000ppmCH4) | |
| Standard test conditions | Tem. Humidity | 20℃±2℃；55%±5%RH | |
| Standard test circuit | Vc：5.0V±0.1V； VH（High temp.）：5.0V±0.1V； VH（Low temp.）：1.5V±0.1V | ||
| Preheat time | Over 48 hours | ||
| O2content | 21%（not less than 18%） O2 concentration effects initial value, sensitivity and repeatability. | ||
| Life span | 10 years | ||
CO Sensor
MQ-9B Carbon Monoxide Gas Sensor – High Accuracy Semiconductor CO Detector
₹295.00 Price With Tax
Buy the MQ-9B carbon monoxide (CO) semiconductor gas sensor for reliable CO detection. High sensitivity, wide detection range, fast response, and easy integration for home safety, air quality monitoring, and DIY electronics.
15 Days Warranty
This product comes with a 15-day warranty starting from the date of delivery. The warranty covers manufacturing defects only. If a defect is confirmed, the item will be replaced.
Warranty will not apply if:
- The product has been misused, dropped, or damaged.
- It has been exposed to water, fire, chemicals, or static discharge.
- It has been tampered with, soldered, or altered in any way.
MQ-9B Semiconductor Sensor for Carbon Monoxide (CO)
The MQ-9B Semiconductor Sensor for Carbon Monoxide (CO) is a dependable and cost-effective gas sensor designed for accurate detection of carbon monoxide in residential, commercial, and hobbyist applications. Built using advanced semiconductor sensing technology, the MQ-9B delivers stable performance, reliable output, and strong sensitivity to CO gas — ideal for safety systems, smart monitoring devices, and electronics projects.
Carbon monoxide is a colourless, odorless, and toxic gas produced by incomplete combustion of fuels such as gasoline, natural gas, wood, and charcoal. Because it cannot be detected by the human senses, carbon monoxide poses serious health risks without proper monitoring. The MQ-9B sensor provides early and accurate detection of CO, helping users build protective solutions that enhance indoor safety and air quality.
Key Features
- High sensitivity semiconductor CO detection
- Wide detection range (suitable for low to high CO concentrations)
- Fast response and recovery time
- Consistent and stable output signal
- Low cost and easy integration into circuits
- Analog output compatible with microcontrollers
- Compact and durable design for long-term use
Core Applications
- Home carbon monoxide alarm systems
- Indoor air quality monitors
- Portable CO gas detection devices
- Smart home safety solutions
- Arduino, Raspberry Pi, and microcontroller projects
- Educational and DIY electronics kits
How the MQ-9B Sensor Works
The MQ-9B sensor operates on the principle of semiconductor sensing. When carbon monoxide gas is present in the air, the sensor’s sensitive tin-dioxide (SnO₂) layer interacts with the gas molecules. This interaction changes the electrical resistance of the sensing element in proportion to CO concentration.
This resistance change is converted into an analog voltage output, which can be easily read by microcontrollers, signal processors, or alarm circuits. The MQ-9B’s design also minimizes cross-sensitivity to other gases, ensuring more accurate carbon monoxide measurement.
Performance Highlights
- Fast Response: Quickly detects changes in CO levels, enabling early warning systems.
- Stable Operation: Reliable output over extended usage with minimal drift.
- Wide Detection Range: Effective for both low-level air quality monitoring and higher CO concentration detection in safety systems.
- Low-Cost: Practical choice for consumer electronics, safety devices, and educational projects.
Why Choose MQ-9B?
The MQ-9B Semiconductor Sensor is a versatile and affordable solution for carbon monoxide detection. Its combination of sensitivity, reliability, and ease of use makes it a preferred choice for DIY makers, engineers, and product developers. Whether you’re building a smart alarm, integrating CO sensing into a larger IoT system, or developing portable safety tools, the MQ-9B provides performance and flexibility you can trust.
Stay safe and informed with real-time carbon monoxide detection — the MQ-9B delivers accurate sensing you can depend on.
| Weight | 0.150 kg |
|---|---|
| Dimensions | 12 × 6 × 6 cm |
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