MQ-3 Alcohol Gas Sensor Module
This module is made using Alcohol Gas Sensor MQ3. It is a low cost semiconductor sensor which can detect the presence of alcohol gases at concentrations from 0.05 mg/L to 10 mg/L. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of alcohol gases increases. It has high sensitivity to alcohol and has a good resistance to disturbances due to smoke, vapor and gasoline. This module provides both digital and analog outputs. Threshold level for digital output can be easily adjusted using the preset on the board. MQ3 alcohol sensor module can be easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc.
Features
- High sensitivity to alcohol vapors.
- Detects alcohol concentrations ranging from 0.05 to 10mg/L.
- Provides both analog and digital output signals.
- Fast response and recovery times for timely detection.
- Simple drive circuit for easy implementation.
- Long service life with stable performance.
- Adjustable sensitivity via onboard potentiometer.
- Compact design suitable for various applications.
Specifications
| Parameter | Value |
|---|---|
| Sensor Type | Semiconductor (SnO₂) |
| Target Gas | Alcohol vapor |
| Detection Range | 0.05–10mg/L |
| Operating Voltage | 5VDC |
| Heater Voltage (VH) | 5.0V±0.1V AC or DC |
| Load Resistance (RL) | Adjustable |
| Heater Resistance (RH) | 31Ω±3Ω (Room Temp) |
| Heater Consumption | ≤900mW |
| Sensitivity (S) | Rs(in air)/Rs(0.4mg/L alcohol) ≥5 |
| Preheat Time | ≥24 hours |
| Operating Temperature | -10°C to 50°C |
| Operating Humidity | ≤95% RH |
| Dimensions | 35mm x 22mm x 30mm |
PINOUT
- VCC – Input Power Supply
- GND – Supply Ground
- DO – Digital Output
- AO – Analog Output
Applications
- Breathalyzer devices for personal or professional use.
- Alcohol detection systems in vehicles.
- Industrial safety equipment for monitoring alcohol vapors.
- Integration into microcontroller-based projects for alcohol monitoring.
- Educational projects and laboratory experiments involving gas detection.
Package Contents
- 1x MQ-3 Alcohol Gas Sensor Module.