The MQ4 gas sensor is a compact and highly specialized device designed to detect the presence of methane gas with exceptional sensitivity. It exhibits low sensitivity towards other gases while demonstrating a robust response to methane gas specifically. When exposed to an environment with varying concentrations of CH4, the sensor generates an output signal that accurately reflects the detected methane levels. This sensor has garnered significant credibility and has been widely employed in various applications such as alarm systems, gas detection circuits, and even in challenging environments like coal mines. Its reliability and effectiveness make it an ideal choice for industries and settings where methane gas detection is critical for safety and operational purposes.

• Straightforward drive circuit: The module has a user-friendly drive circuit, making it easy to integrate into various systems and applications.
• Long-lasting & Quick response time: The sensor is designed for durability and exhibits a rapid response time, ensuring efficient and reliable gas detection.
• Inconsequential smoke and alcohol sensitivity: The sensor has negligible sensitivity to smoke and alcohol, allowing for accurate methane gas detection without interference from these substances.
• High sensitivity for Methane (CH4) and natural gas: The module offers exceptional sensitivity specifically towards methane and natural gas, enabling precise detection even at low concentrations.
• Wide range coverage: The sensor provides a wide detection range, allowing it to monitor methane gas concentrations spanning from 200ppm to 10000ppm.
• Semiconductor type sensor: The MQ4 sensor is based on a semiconductor technology, which enhances its sensitivity and accuracy in detecting methane gas.
• More than 24 hours of preheat time: The module requires a preheat time of over 24 hours before it can provide reliable and consistent gas detection results.
• 20Ω load resistance: The sensor requires a load resistance of 20Ω to ensure optimal functioning.
• Lower than 95% RH (Relative humidity): The module should be operated at a relative humidity lower than 95% to maintain its performance and longevity.
• 750 MW ≥ heat consumption: The module consumes heat at a rate of at least 750 MW during operation.
• 14 to 122 degrees Fahrenheit operating temperature: The sensor operates within a temperature range of 14 to 122 degrees Fahrenheit, allowing it to function effectively in a variety of environmental conditions.
• 1 TTL Compatible interface output (ALR) and 1 TTL compatible interface input (HSW): The module offers a TTL compatible output interface (ALR) and an input interface (HSW) for seamless integration with other systems.
• 5V±0.1 VCC power requirement: The sensor module requires a power supply of 5V with a tolerance of ±0.1V.
• 5V and 0.1 DO Output: The module provides a digital output (DO) of 5V when methane gas is detected and 0.1V when no gas is detected.
• 0.1V to 0.3V AO output: The module also features an analog output (AO) that ranges from 0.1V to 0.3V, providing additional information about the gas concentration.
• 21% oxygen concentration (when in standard condition): The sensor can detect the oxygen concentration of the environment and assumes it to be 21% under standard conditions.