| Target: | CO |
| Model: | MQ-7B |
| Detection range: | 10-500ppm |
| Detection principle: | Semiconductor |
| Characteristics: | Good sensitivity to CO |
| Size: | φ16.7×9.4 |
| Working conditions: |
Loop Voltage：5±0.1V High temp.heater voltage：5±0.1V Low temp.heater voltage：1.5±0.1V |
| Notes: | Low temperature 90s detection, high temperature 60s cleaning |
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Description
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.
Application
It is widely used in domestic CO gas leakage alarm, industrial CO gas alarm and portable CO gas detector.
Features
It has good sensitivity to carbon monoxide in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
Specifications
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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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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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Standard test conditions* The description and specifications might be changed without notice. Please contact us for the latest information before placing orders.
Technical Support:
Customized technical design and function, LOGO and package are available without extra charge (including molding fee) for mass volume.
The sensors don't have sleeping mode. It can be set in program if needed.
All Winsen products go through strict inspections and tests to make sure they are 100% qualified before shipping out.
The sensor has been fully tested (not calibrated) before leaving the factory, but the module will be calibrated before leaving the factory.
However, after transportation and storage, the environment conditions change, and the surface of the sensor absorbs moisture, mixed gas, pollution matters, etc. It is recommended that customers perform aging and calibration after sensors become stable according to the program and use occasions of the whole device.
15﹪-90﹪RH without condensation,greater or less than this range or long-term high temperature and high humidity will affect the life of the sensor.
Our sensors are certified with CE, 3C, ROHS, anti-explosion, fire prevention, and coal mining safety according to different applications. And we provide assistance for new certification.
Many factors can cause the sensor to fail such as broken wires in transportation, poisoning, falling off of the sensitive material, damage to the heating wire (device), etc. Please find specific cause in each category with Winsen’s aftersales.
Winsen provides professional consultation and service before and after sales. We will recommend the best fitting sensor for your demand. If you have any problem, don’t hesitate to email us to sales@winsensor.com
Due to high volume of daily incoming emails and time zone difference, we may not be able to reply your emails immediately. But we will reply to your inquiry in 24 business hours.
