GAS_AND_SMOKE_DETECTOR

Published:2009/6/24 21:13:00 Author:Jessie | From:SeekIC

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 in-crease causes a decrease of the sensor element internal resistance. The switch in series with the SCR is used for resetting the alarm.



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