MQ-4 High Sensitive to Methane and Natural Gas
Review: 5 - "A masterpiece of literature" by John Doe, written onMay 4, 20020

MQ-4 High Sensitive to Methane and Natural Gas

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  • Product SKU: KG053
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The MQ-4 High Sensitivity Gas Sensor Module is widely used to detect various gases, particularly methane (CH4) and natural gas.

Here's an overview of the MQ-4 sensor module:

Purpose: The MQ-4 sensor module is designed to detect gases like methane and natural gas, making it valuable for applications where gas leakage needs to be monitored.

Sensitivity: It has a high sensitivity to methane and other combustible gases.

Principle: The sensor operates on the principle of a semiconductor gas sensor, where the resistance of the sensing material changes based on the concentration of the target gas.


Analog and Digital Output: Like other MQ series sensors, the MQ-4 module provides both analog and digital outputs. The analog output can be used to estimate the gas concentration, while the digital output can be configured to trigger alerts when the gas concentration exceeds a set threshold.

Adjustable Sensitivity: Many modules have a potentiometer that allows users to adjust the sensor's sensitivity.

Affordability: The MQ-4 sensor module is cost-effective, making it a popular choice for gas detection projects.


Gas Leakage Detection: The MQ-4 sensor is widely used to detect methane leaks in households, industries, and commercial spaces. It's particularly useful in preventing potential explosions due to gas leaks.

Industrial Safety: In environments where methane or other combustible gases are present, the sensor can provide early warnings to ensure worker safety.

Environmental Monitoring: The sensor can be used to monitor methane emissions from sources such as landfills or agricultural processes.

Using the MQ-4:

Powering the Sensor: The sensor typically requires a 5V DC power supply.

Calibration: To achieve accurate readings, calibration may be necessary. This involves exposing the sensor to clean air to establish a baseline resistance value.

Reading Values: a digital input pin on the microcontroller.


Warm-Up Time: The sensor may require some time to warm up before it provides reliable readings.

Cross-Sensitivity: The MQ-4 sensor might exhibit cross-sensitivity to gases other than methane. This can affect accuracy if other gases are present in the environment.

Environmental Factors: As with all gas sensors, environmental conditions like temperature and humidity can impact its performance.

Technical Details

  • Model: MQ-4
  • IC Chip: LM393
  • Operating Voltage (VDC) : 3 ~ 5
  • Detecting Range: 300ppm to 10000ppm

Physical Attributes

  • Length * Width * Height (mm): 36 x 20 x 21
  • Weight (gm): 7

Integration with Arduino


Sample Code


  • Used in gas leakage detecting equipment for homes and industry. They are suitable for detecting CH4 and CNG.
  • Industrial Combustible gas detector
  • Portable gas detectors

Additional Details

  • Signal output indicator
  • Dual Signals output (analog output and TTL output)
  • The TTL output signal is low level, allows to connect with SCM directly
  • Analog output 0~5V voltage
  • High sensitivity
  • Long working life and stable performance
  • Quick response and recovery.

Product Video


Package Includes

  • 1 x MQ-4 High Sensitive to Methane and Natural Gas

Customer Reviews

Based on 1 review
Good one

Good sensor. Detects almost all kinds of flammable gas