MQ-4 Gas Sensor (Methane / Natural Gas Detection)

The MQ-4 Gas Sensor is specifically designed for methane (CH₄) and compressed natural gas (CNG) detection. It offers a wide detection range (typically 200–10,000 ppm) and is commonly used in gas leak detectors, mining safety systems, and environmental monitoring setups.

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All MQ sensors use SnO₂ semiconductor technology with resistance varying according to gas concentration.
Typical detection ranges: 10 ppm to 10,000 ppm depending on the gas type.
Require preheating (20–60 seconds or more) for stable readings.
Provide analog output + digital threshold output (via comparator board).

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