Gas and smoke detector

  

Posted on Feb 26, 2013    5787

This circuit can detect smoke and a number of gases (CO, CO2, methane, coal gas and others) with a 10 ppm sensitivity. It uses a heated surface semiconductor sensor. Detection occurs when the gas concentration increase causes a decrease of the sensor element internal resistance


Gas and smoke detector - schematic

The switch in series with the SCR is used for resetting the alarm.




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