Product Introduction
1. Combustible Gas/Carbon Monoxide Sensor (CO Sensor) MQ-9 Product Description
The MQ-9 gas sensor uses gas-sensitive material with low conductivity in clean air, tin dioxide (SnO2). It adopts a high-low temperature cycling detection method: low temperature (1.5V heating) detects carbon monoxide, and the sensor's conductivity increases with the concentration of carbon monoxide in the air; high temperature (5.0V heating) detects combustible gases such as methane and propane and cleans 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-9 gas sensor has high sensitivity to carbon monoxide, methane, and liquefied gas. This sensor can detect a variety of gases containing carbon monoxide and combustible gases, making it a low-cost sensor suitable for multiple applications.
2. Combustible Gas/Carbon Monoxide Sensor (CO Sensor) MQ-9 Features
Good sensitivity to carbon monoxide/combustible gases
High sensitivity to methane, propane, and carbon monoxide
Long life, low cost
Simple drive circuit required
3. Combustible Gas/Carbon Monoxide Sensor (CO Sensor) MQ-9 Main Applications
Household gas leak alarms
Industrial combustible gas alarms
Portable gas detectors
4. Combustible Gas/Carbon Monoxide Sensor (CO Sensor) MQ-9 Technical Specifications
| Product Model |
MQ-9 |
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| Product Type |
Semiconductor gas-sensitive element |
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| Standard Package |
Bakelite |
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| Detection Gas |
Carbon monoxide, combustible gases |
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| Detection Concentration |
10-1000ppm CO; 100-10000ppm combustible gas |
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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 |
Approximately 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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