MQ-138 Gas Sensor (Multi-Gas Detection)

The MQ-138 Gas Sensor is a versatile sensor capable of detecting a range of gases including benzene, alcohol, smoke, and other volatile organic compounds (VOCs). Its broad detection capability makes it suitable for indoor air quality monitoring, safety systems, and research applications. The sensor offers good sensitivity and quick response, making it an excellent choice for multi-gas detection projects.

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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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