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Pricelist: Retail Price (B2C) Pricelist
Pricelist: Retail Price (B2C) Pricelist
MQ-4 High-Sensitivity Methane (CH4) and CNG Gas Sensor Module

MQ-4 High-Sensitivity Methane (CH4) and CNG Gas Sensor Module

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ParameterDetailed Specification
Operating Voltage5V DC
Target GasesMethane (CH4), CNG (Compressed Natural Gas)
Detection Concentration200ppm – 10000ppm
Sensing MaterialTin Dioxide (SnO2)
Comparator ChipOn-board LM393
Output TypeDual Output: Digital (DO) & Analog (AO)
Heating Current~150mA
Price
₹ 101.69 ₹ 101.69
(Tax included)

Product Description

Ensure maximum safety in environments prone to natural gas leaks with the MQ-4 High-Sensitivity Methane and CNG Gas Sensor Module. This semiconductor-based sensor is specifically optimized for the detection of Methane (CH4), the primary component of CNG. At Robogears, we recommend the MQ-4 for its superior sensitivity to methane while maintaining a low cross-sensitivity to alcohol and smoke, reducing the likelihood of false triggers. The module features an LM393 comparator for precise digital switching and a multi-turn potentiometer to calibrate your safety thresholds. Whether you are building an IoT-based home gas monitor or an industrial safety system at your Pimpri facility, the MQ-4 provides a fast-response, reliable solution for detecting explosive natural gas concentrations.

Detailed Key Features

  • Methane & CNG Specialized: High sensitivity to Methane (CH4) concentrations ranging from 200 to 10,000 ppm, perfect for natural gas leak detection.

  • Dual Signal Interface: Features a Digital Output (DO) for direct triggering of alarms or safety valves, and an Analog Output (AO) for real-time concentration logging.

  • Adjustable Sensitivity Threshold: The integrated potentiometer allows you to fine-tune the exact gas level at which the digital alarm activates.

  • Fast Response & Recovery: The SnO2 sensing layer reacts rapidly to gas presence and returns to its baseline state quickly once the air is ventilated.

  • Broad Platform Compatibility: Standard 4-pin interface ensures seamless connection to Arduino, ESP32, Raspberry Pi, and other microcontrollers.

All Technical Details

  • On-board Signal Processing: The LM393 ensures the digital signal is a clean square wave, ideal for triggering interrupts in your code.

  • Real-Time Visual Indicators: Equipped with a Power LED (Red) and a Signal LED (Green) that illuminates the moment gas levels exceed your preset limit.

  • Rugged Construction: Features a stainless steel mesh cover to protect the sensitive internal heating and sensing elements.

  • Applications: Residential gas leakage alarms, industrial natural gas monitors, and portable CNG detectors.

Prototyping & Engineering Tips (Robogears Exclusive)

  • The 24-Hour "Burn-In": At our Pimpri workshop, we always emphasize a 24-hour preheat period for new MQ-4 sensors. This process stabilizes the sensing element for much more accurate PPM readings.

  • Strategic Placement: Methane is lighter than air. For effective CNG leak detection, mount the MQ-4 near the ceiling or the highest point of the room, as the gas will rise rapidly.

  • Heater Awareness: It is normal for the sensor to feel warm during operation. The internal heater is required to facilitate the chemical reaction between the methane gas and the SnO2 layer.

  • Power Supply Tip: The heater draws approximately 150mA. If you are using multiple MQ sensors, avoid powering them directly from an Arduino's 5V pin to prevent voltage drops; use an external regulated 5V power supply.

Package Includes

  • 1 x MQ-4 High-Sensitivity Methane (CH4) and CNG 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-4 methane detection performance and 5V compatibility remain as described.