MQ-3B Alcohol Sensor
The gas sensing material used in the MQ-3B alcohol gas sensor is tin dioxide (SnO2), which has a low conductivity in clean air. When there is alcohol vapor in the environment where the alcohol sensor is located, the conductivity of the gas sensor increases with the increase of the alcohol gas concentration in the air. The change in conductivity can be converted into an output signal corresponding to the gas concentration using a simple circuit.
MQ-3B semiconductor alcohol sensor has high sensitivity to alcohol and can resist the interference of gasoline, smoke and water vapor. This gas sensor can detect alcohol atmospheres of various concentrations and is a low-cost sensor suitable for a variety of applications.
Sensor Features
This product has good sensitivity to alcohol in a wide concentration range. It has the advantages of long life, low cost and simple driving circuit.
main application
Widely used in automotive alcohol gas alarms, industrial alcohol gas alarms and portable gas detectors.
Technical indicators
Product number |
MQ-3B Alcohol Sensor |
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product type |
Semiconductor gas sensor |
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standard package |
plastic seal |
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detect gas |
alcohol steam |
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Detection concentration |
25~500ppm Alcohol |
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Standard Circuit Conditions |
loop voltage |
Vc |
≤24V DC |
heating voltage |
VH |
5.0V±0.1V AC or DC |
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Load Resistance |
RL |
adjustable |
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Gas sensor characteristics under standard test conditions |
heating resistance |
RH |
29±3Ω(room temperature) |
Heating power consumption |
PH |
≤900mW |
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The output voltage |
Vs |
2.5V-4.0V (in 125ppm Alcohol) |
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Sensitivity |
S |
Ro(in air)/Rs(125ppm Alcohol)≥5 |
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Concentration slope |
α |
≤0.6(R300ppm/R50ppm Alcohol) |
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Standard Test Conditions |
temperature humidity |
20℃±2℃;55%±5%RH |
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Standard Test Circuit |
Vc:5.0V±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 year |
Note: The output voltage (Vs) refers to the VRL in the test atmosphere
Note: Product parameters are subject to change without prior notice
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: 0371-60932951.