MQ-4 CNG Methane Natural Gas Sensor Module

The MQ-4 CNG Methane Natural Gas Sensor Module is a 32mm x 20mm x 22mm SnO2 semiconductor sensor sensitive to methane, CNG (compressed natural gas), and natural gas across 300 to 10,000 ppm, operating from 3V to 5V DC with an onboard LM393 comparator IC. The mq4 gas sensor is particularly relevant in India given the widespread use of CNG-powered autos, buses, and cars — the mq4 cng sensor can be used to detect CNG leaks in vehicle cabins, CNG cylinder storage areas, and biogas plant installations where methane is the primary gas.

The methane gas sensor LM393 comparator provides a clean digital threshold output (DO) in addition to the analog (AO) output — similar to how LM393 is used in IR sensor modules, the comparator converts the analog gas concentration signal into a digital HIGH/LOW alarm trigger at a potentiometer-set threshold, while the AO pin still provides the continuous concentration reading for logging. The mq4 sensor module 3V to 5V operating range is wider than the fixed 5V of MQ-3 and MQ-135, giving slightly more flexibility for 3.3V logic-level microcontrollers, though the heater still requires adequate current.

In all MQ-series sensors, the cng gas sensor module requires heater warm-up before stable readings, and the 300ppm minimum detection threshold means very low-level methane leaks below this concentration will not register. Available from StemVolt, this MQ-4 methane gas sensor module is ideal for robotics developer and electronics enthusiast developing natural gas detection, leakage monitoring, and embedded sensing projects with reliable methane concentration measurement capabilities.

Related Products:

• Checkout MQ-9 Gas Sensor Module
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Features:

• Detects methane, CNG, and natural gas across 300-10000ppm
• LM393 comparator gives digital threshold alarm plus analog reading
• 3V to 5V wider range suits 3.3V and 5V microcontrollers
• Potentiometer sets digital output trigger threshold for alarm circuits
• Compact 32mm x 20mm x 22mm fits vehicle and cylinder storage enclosures

Technical Specifications:

 Applications:

• MQ-4 Sensor used for Arduino CNG vehicle leak alarm build
• College project uses mq4 gas sensor for methane detection demo
• CNG auto uses mq4 cng sensor for India cabin leak alert
• Biogas plant uses methane gas sensor for digester gas monitoring
• IoT monitor uses mq4 sensor module for remote CNG level logging

Package Includes:

• 1 x MQ-4 CNG Methane Natural Gas Sensor Module