MQ-137 Gas Sensor (Ammonia Detection)

The MQ-137 Gas Sensor is used for detecting ammonia (NH₃) gas in various environments. It is highly sensitive to ammonia while maintaining moderate resistance to interference from other gases. This sensor is ideal for agricultural applications, refrigeration systems, industrial leak detection, and environmental monitoring. With fast response and recovery times, it provides reliable performance for real-time gas detection systems.

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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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