MQ-7B Carbon Monoxide Sensor
The gas sensing material used in the MQ-7B carbon monoxide gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. The high and low temperature cycle detection method is used to detect carbon monoxide at low temperature (1.5V heating). The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit.
The MQ-7B carbon monoxide gas sensor has high sensitivity to carbon monoxide. This sensor can detect a variety of carbon monoxide-containing gases and is a low-cost sensor suitable for a variety of applications.
Sensor Features
Good sensitivity to carbon monoxide gas
Long life and low cost
A simple drive circuit can
main application
Household Gas Leak Alarm
Industrial carbon monoxide gas alarm
Portable Gas Detector
Technical indicators
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Product number |
MQ-7B Carbon Monoxide Sensor |
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product type |
Semiconductor gas sensor |
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standard package |
plastic seal |
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detect gas |
carbon monoxide |
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Detection concentration |
10-500ppm CO |
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Standard Circuit Conditions |
loop voltage |
Vc |
≤24V DC |
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heating voltage |
VH |
5.0V±0.1V ACorDC（high temperature） 1.5V±0.1V ACorDC（low temperature） |
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heating time |
TL |
60±1S（high temperature）90±1S（low temperature） |
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Load Resistance |
RL |
adjustable |
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Component characteristics under standard test conditions |
heating resistance |
RH |
29Ω±3Ω（room temperature） |
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Heating power consumption |
PH |
≤900mW |
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The output voltage |
Rs |
2.5V~4.3V(in150ppmCO) |
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Sensitivity |
S |
Rs(in air)/Rs(150ppmCO)≥5 |
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Concentration slope |
α |
≤0.6(R300ppm/R50ppm CO) |
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Standard Test Conditions |
temperature humidity |
20℃±2℃；65%±5%RH |
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Standard Test Circuit |
Vc:5.0V±0.1V； VH（high temperature）: 5.0V±0.1V； VH（low temperature）: 1.5V±0.1V |
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Preheat time |
Not less than 48 hours |
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oxygen content |
21% (not less than 18%, the oxygen concentration will affect the initial value, sensitivity and repeatability of the sensor, please consult when using it under low oxygen concentration) |
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life |
10 years |
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Note: The output voltage (Vs) refers to the VRL in the test atmosphere
production workshop
patent certificate
You can contact us through the online message and online customer service on the right, or you can call our national service hotline: 086-0371-60932951.
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