Product Introduction
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Carbon Monoxide Sensor (CO Sensor) MQ-7 Product Description
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The gas sensing material used in the MQ-7 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. It adopts a high-low temperature cycling detection method. At low temperature (1.5V heating), it detects carbon monoxide, and the sensor's conductivity increases with the concentration of carbon monoxide gas in the air. At high temperature (5.0V heating), it cleans the stray gases adsorbed at low temperature. A simple circuit can convert the change in conductivity into an output signal corresponding to the gas concentration.
The MQ-7 gas sensor has high sensitivity to carbon monoxide and can detect various gases containing carbon monoxide. It is a low-cost sensor suitable for multiple applications.
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Carbon Monoxide Sensor (CO Sensor) MQ-7Sensor Features
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Good sensitivity to carbon monoxide gas
Long life, low cost
Simple drive circuit required
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Carbon Monoxide Sensor (CO Sensor) MQ-7Main Applications
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Household gas leak alarms
Industrial carbon monoxide gas alarms
Portable gas detectors
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Carbon Monoxide Sensor (CO Sensor) MQ-7Technical Specifications
| Product Model |
MQ-7 |
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| Product Type |
Semiconductor gas sensing element |
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| Standard Package |
Plastic encapsulation |
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| Detection Gas |
Carbon monoxide |
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| Detection Concentration |
10-1000ppmCO |
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| Standard Circuit Conditions |
Loop Voltage |
Vc |
≤10V DC |
| Heating Voltage |
VH |
5.0V±0.2V AC or DC (high) 1.5V±0.1V AC or DC (low) |
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| Heating Time |
TL |
60±1S (high) 90±1S (low) |
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| Load Resistance |
RL |
Adjustable |
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| Element Characteristics under Standard Test Conditions |
Heating Resistance |
RH |
31Ω±3Ω (room temperature) |
| Heating Power Consumption |
PH |
≤350mW |
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| Surface Resistance of Sensitive Body |
Rs |
2KΩ-20KΩ(in100ppmCO) |
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| Sensitivity |
S |
Rs(in air)/Rs(100ppmCO)≥5 |
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| Concentration Slope |
α | ≤0.6(R300ppm/R100ppm 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): 5.0V±0.1V; VH(Low): 1.5V±0.1V |
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| Preheating Time |
No less than 48 hours |
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