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मूल्य सूची: Retail Price (B2C) मूल्य सूची
मूल्य सूची: Retail Price (B2C) मूल्य सूची
MQ-3 Alcohol Gas Sensor Module

MQ-3 Alcohol Gas Sensor Module

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ParameterDetailed Specification
Operating Voltage5V DC
Target GasAlcohol (Ethanol)
Detection Concentration0.05mg/L – 10mg/L (Alcohol)
Sensing MaterialTin Dioxide ($SnO_2$)
Comparator ChipOn-board LM393
Output TypeDual Output: Digital (DO) & Analog (AO)
Heater Power~750mW
Price
₹ 135.59 ₹ 135.59
(Tax included)

Product Description

Detect ethanol vapor with precision using the MQ-3 Alcohol Gas Sensor Module. This high-sensitivity semiconductor sensor is specifically engineered to detect alcohol concentrations in the air, making it the industry-standard component for DIY breathalyzers and environmental monitoring. At Robogears, we recommend the MQ-3 for its excellent resistance to interference from gasoline, smoke, and water vapor, ensuring reliable readings. The module features an LM393 comparator for stable digital switching and a multi-turn potentiometer to calibrate your safety thresholds. Whether you are building a smart ignition interlock prototype or an industrial alcohol leak detector at your Pimpri facility, the MQ-3 provides a fast-response, cost-effective sensing solution.

Detailed Key Features

  • Ethanol-Specific Sensitivity: Highly sensitive to alcohol (ethanol) vapors, providing a clear signal even at low concentrations.

  • Dual Signal Interface: Features a Digital Output (DO) for simple high/low triggers and an Analog Output (AO) for real-time concentration graphing via an ADC.

  • Adjustable Sensitivity: The on-board potentiometer allows you to fine-tune the exact alcohol level at which the digital alarm should activate.

  • Fast Response & Recovery: The $SnO_2$ sensing layer reacts rapidly upon exposure and returns to baseline quickly once the vapor is removed.

  • Integrated Indicators: Includes a Power LED and a Signal LED that lights up instantly when the detected alcohol level exceeds your preset limit.

All Technical Details

  • On-board Signal Conditioning: The LM393 ensures the digital output is a clean square wave, perfect for triggering interrupts on an Arduino or ESP32.

  • Rugged Construction: Features a dual-layer stainless steel mesh to protect the sensitive internal heating and sensing elements from physical damage.

  • Standard Interface: 4-pin header (VCC, GND, DO, AO) ensures compatibility with standard jumper wires and breadboards.

  • Applications: Portable breathalyzers, ethanol leakage alarms, and environmental monitoring in laboratories.

Prototyping & Engineering Tips (Robogears Exclusive)

  • The "Burn-In" Period: At our Pimpri facility, we always advise users to allow a 24-hour preheat period for new MQ-3 sensors. This stabilizes the sensing element for much more accurate readings.

  • Heater Awareness: It is normal for the sensor to feel warm during operation. The internal heater is necessary to facilitate the chemical reaction between the alcohol vapor and the $SnO_2$ layer.

  • Analog Calibration: For accurate mg/L or BAC (Blood Alcohol Content) calculations, you must calibrate the sensor against a known alcohol concentration. Use a dedicated MQ library to handle the logarithmic mapping of the analog values.

  • Avoid Contaminants: Do not expose the sensor to high concentrations of silicone vapors or corrosive gases, as these can permanently "poison" the sensing layer.

Package Includes

  • 1 x MQ-3 Alcohol Gas Sensor Module

Image Disclaimer

Product images are shown for illustrative purposes only. The color of the PCB (typically Blue or Black) or the protective mesh style may vary between batches, but the MQ-3 alcohol detection performance and 5V compatibility remain as described.