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Sensor WorkshopSunday, April 27, 2008. Sensor Report - MQ3 Gas sensor. 1 MQ3 Gas Sensor. This is an alcohol sensor from futurlec,. Named MQ-3, which detects ethanol in the air. It is one of the straightforward gas sensors so it works almost the same way with other gas sensors. It costs $6.90.Typically, it is used as part of the breathalyzers or breath testers for the detection of ethanol in the human breath. Here is a datasheet. 3 How it looks like :. 4 How it works :. How does it work? The core system is the cube....
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