Sensitive material of MQ-7B gas sensor is SnO2, which with lower conductivity in clean air. It make detection by method of cycle high and low temperature, and detect CO at low temperature(heated by 1.5V).The sensor’s conductivity gets higher along with the CO gas concentration rising. At high temperature (heated by 5.0V),it cleans the other gases adsorbed at low temperature. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit.
Applications
It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
Features
Small in size
Best quality product
High sensitivity, high resolution, low power consumption
Fast response time
Excellent stability
Long lifespan
Anti-poisons, anti-vapor interference
Specification
| Model | MQ-7B |
| Sensor Type | Semiconductor |
| Standard Encapsulation | Plastic cap |
| Target Gas | carbon monoxide |
| Detection range | 10～500ppm CO |
| Heater consumption PH | ≤900mW |
| Sensitivity S | Rs(in air)/Rs(in 150ppm CO)≥5 |
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