The MQ-4 methane sensor is semiconductor-based device designed for detecting natural gas (CH4) concentrations ranging from 200 to 10,000 ppm, featuring high sensitivity, fast response, and both analog/digital outputs. It operates on 5V DC, requiring a heating element to function, and is widely used for domestic, industrial, and portable gas leak detection
Operating Voltage: 5V±0.1
Heating voltage: 5V±0.1
Load Resistance: 2 Kohms
Sensing Resistance Range: 10 – 60 Kohms
CH4 Sensing Range: 300 – 10000 ppm
Sensor Heat Consumption: ≤ 950 mW
Relative Humidity: >95% RH
Standard Oxygen concentration: 21%
Output Analog Voltage: 2.5 – 4 Volts (5000 ppm CH4)
Preheating Time: Over 48 Hours
The sensor is a simple and stable circuit with a TTL DO pin.
The device sensitivity may vary due to oxygen concentration.
It is very sensitive to methane making it quite useful for detecting systems
This methane gas sensor module contains onboard voltage regulator, pull-up resistors to define a default state, a potentiometer for sensitivity, and a capacitor for noise filtering. It has two inbuilt LEDs i.e power LED and a digital output indication LED.
Calibration: The sensor requires a warm-up time to reach the proper temperature for accurate detection.
Sensitivity Adjustment: The onboard potentiometer allows for setting the threshold for the digital output (e.g., triggering an alarm at a certain concentration).
Limitations: While highly sensitive to methane, it may also react to propane, butane, and alcohol.�
Applications
Gas Leakage Detection: Suitable for home or industrial gas leak detection systems.
Portable Detectors: Can be used in handheld devices for monitoring environmental gas levels.
Air Quality Monitoring: Useful for monitoring methane levels in industrial environment
