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Model |
MQ-7B |
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Sensor Type |
Semiconductor |
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Standard Encapsulation |
Plastic cap |
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Target Gas |
carbon monoxide |
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Detection range |
10～500ppm CO |
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Standard Circuit Conditions |
Loop Voltage |
Vc |
5.0V±0.1V DC |
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Heater Voltage |
VH |
5.0V±0.1V AC or DC(High temp.) 1.5V±0.1V AC or DC(Low temp.) |
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Heater Time |
TL |
60 S±1S(High temp.) 90 S±1S(Low temp.) |
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Load Resistance |
RL |
Adjustable |
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Sensor character under standard test conditions |
Heater Resistance |
RH |
30Ω±3Ω (room temp.) |
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Heater consumption |
PH |
≤950mW |
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Sensitivity |
S |
Rs(in air)/Rs(in 150ppm CO)≥5 |
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Output Voltage |
Vs |
2.5V～4.3V (in 150ppm CO) |
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Concentration Slope |
α |
≤0.6(R300ppm/R50ppmCO) |
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Standard test conditions |
Tem. Humidity |
20℃±2℃；55%±5%RH |
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Standard test circuit |
Vc:5.0V±0.1V； VH (High temp.): 5.0V±0.1V VH (Low temp.): 1.5V±0.1V |
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Preheat time |
Not less than 48 hours |
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O2 content |
21%（not less than 18%） O2 concentration effects initial value, sensitivity and repeatability. |
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Preheat time |
Over 48 hours |
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Lifespan |
10years |
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MQ-7B Carbon Monoxide Gas Sensor – Semiconductor CO Detector for Safety & DIY Projects
₹295.00 Price With Tax
Buy MQ-7B carbon monoxide gas sensor for accurate CO detection. Semiconductor sensor with high sensitivity, wide range, and fast response for home safety alarms, air quality monitors, 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-7B Semiconductor Sensor for Carbon Monoxide (CO)
The MQ-7B Carbon Monoxide Gas Sensor is a high-performance semiconductor sensor designed for reliable detection of carbon monoxide (CO) gas in residential and light commercial environments. Built using tin dioxide (SnO₂) sensitive material, the MQ-7B offers high sensitivity to CO with stable performance and long service life, making it an ideal choice for home safety systems and DIY electronics projects.
Carbon monoxide is a colorless, odorless, and potentially lethal gas produced by incomplete combustion of fuels such as LPG, petrol, diesel, wood, and coal. Early detection is essential to prevent CO poisoning. The MQ-7B sensor provides dependable CO concentration monitoring, enabling timely alerts in carbon monoxide alarm systems and portable gas detectors.
Key Features
- High sensitivity to carbon monoxide (CO)
- Wide detection range (typically 10–1000 ppm)
- Fast response and recovery time
- Long lifespan with stable output
- Low-cost and easy to integrate
- Analog output compatible with microcontrollers
- Compact and lightweight design
Ideal Applications
- Household carbon monoxide alarm systems
- Portable CO gas detectors
- Smart home safety devices
- Indoor air quality monitoring systems
- Arduino, Raspberry Pi & IoT projects
- Educational electronics experiments
How MQ-7B Works
The MQ-7B sensor operates using a heated semiconductor element. When carbon monoxide gas is present, the sensor’s internal resistance changes proportionally to the gas concentration. This change can be measured as an analog voltage output, allowing easy interfacing with microcontrollers and alarm circuits.
The sensor requires a cyclical heating process (high and low temperature phases) to accurately detect CO while minimizing interference from other gases. With proper calibration, it delivers reliable and repeatable measurements for consumer-level applications.
Why Choose MQ-7B?
- Proven semiconductor sensing technology
- Budget-friendly solution for home safety
- Simple circuit design and easy calibration
- Widely used in DIY and IoT communities
- Suitable for battery and mains-powered systems
The MQ-7B Carbon Monoxide Gas Sensor is a practical and cost-effective solution for detecting harmful CO gas in indoor environments. Whether you’re building a home safety alarm, developing a portable detector, or working on an IoT air quality monitoring project, the MQ-7B provides dependable performance and easy integration.
Ensure safer living spaces with accurate carbon monoxide detection using the MQ-7B semiconductor CO gas sensor.
| Weight | 0.150 kg |
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| Dimensions | 12 × 6 × 6 cm |
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