MQ-9 Gas Sensor (CO & Flammable Gas Detection)

The MQ-9 Gas Sensor is a dual-purpose sensor capable of detecting carbon monoxide (CO) and flammable gases such as methane and LPG. It uses temperature cycling to differentiate between gases, making it suitable for multi-gas safety systems. Detection ranges typically include 10–1000 ppm for CO and higher ranges for combustible gases

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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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