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Semiconductor Alcohol Sensor MQ-3B
Summary:
Sensitive material of MQ-3B gas sensor is SnO2, which with lower conductivity in clean air. When the target alcohol gas exist, the sensor’s conductivity gets higher along with the gas concentration rising. Users can convert the change of conductivity to correspond output signal of gas concentration through a simple circuit. MQ-3B gas sensor has high sensitivity to alcohol gas and can resistant to the interference of gasoline, smoke and vapour. It is with low cost and suitable for various applications of detecting alcohol at different concentration.
Feature:
It has good sensitivity to propane, smoke &etc in wide range, and has advantages such as long lifespan, low cost and simple drive circuit &etc.
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APPLICATION
The picture shows a common "ignition interlock system" with an alcohol detection function in the United States. This lock is connected to the ignition system of the car. Before ignition, the driver must blow air to ensure that the alcohol concentration in the body does not exceed the standard. and the car can start.
Strengthen the punishment of drinking and driving in all the country to reduce the vicious traffic accidents caused by drunk driving. This involves testing a person's alcohol level and using equipment to do the testing. An alcohol detector is an effective tool for measuring the alcohol content in the human body.
Formaldehyde detector is an instrument for detecting formaldehyde. Generally, semiconductor sensors and electrochemical sensors are used to realize the rapid semi-quantification of formaldehyde in indoor air on the spot, which is characterized by simple structure, small size, intuitive,easy to carry and use.
Air pollution is becoming more and more serious. The value of PM2.5 (referring to particulate matter with aerodynamic equivalent diameter less than or equal to 2.5 microns in ambient air) is a parameter index.
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PARAMETER
Technical Data Sheet
| Model | MQ-3B | ||
| Sensor Type | Semiconductor | ||
| Standard Encapsulation | Plastic cap | ||
| Target Gas | Alcohol gas | ||
| Detection range | 25~500ppm alcohol | ||
| Standard Circuit Conditions | Loop Voltage | VC | ≤24V DC |
| Heater Voltage | VH | 5.0V±0.1V AC or DC | |
| Load Resistance | RL | Adjustable | |
| Sensor character under standard test conditions | Heater Resistance | RH | 29Ω±3Ω (room temp.) |
| Heater consumption | PH | ≤900mW | |
| Sensitivity | S | R0(in air)/Rs(125ppm C2H5OH)≥5 | |
| Output Voltage | VS | 2.5V~4.0V (in 125ppm C2H5OH) | |
| Concentration Slope | α | ≤0.6(R300ppm/R50ppm C2H5OH) | |
| Standard test conditions | Tem. Humidity | 20℃±2℃；55%±5%RH | |
| Standard test circuit | VC:5.0V±0.1V VH:5.0V±0.1V | ||
| Preheat time | Over 48 hours | ||
Free Guide! Learn the Parameter Differences of Similar Sensors
Wondering how to find the most suitable one for you out of so many sensors? Download our free guide to learn the comparison table of technical parameters.
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As a pioneer in gas sensor based solutions with the advanced processes, technologies and products, Winsen offers a wide range of gas sensors:
RELATED PRODUCTS
As a pioneer in gas sensor based solutions with the advanced processes, technologies and products, Winsen offers a wide range of gas sensors:
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