صورة MQ-303B Gas Sensor (Alcohol Detection – High Sensitivity)

MQ-303B Gas Sensor (Alcohol Detection – High Sensitivity)

The MQ-303B Gas Sensor is an upgraded alcohol sensor with improved sensitivity compared to MQ-3. It is commonly used in breath analyzers and alcohol detection instruments requiring higher precision.
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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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