MQ-131 Gas Sensor (Ozone Detection)

The MQ-131 Gas Sensor is specifically designed for detecting ozone (O₃) concentrations in the air. It offers high sensitivity to ozone with relatively low sensitivity to other gases, making it suitable for environmental monitoring, air purification systems, and industrial safety applications. The sensor operates using a tin dioxide (SnO₂) semiconductor layer, whose resistance changes in the presence of ozone. It is commonly used in air quality monitoring stations and laboratory setups where precise ozone detection is required.

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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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