TRIAC_GAS_SMOKE_DETECTOR

Published:2009/7/3 5:16:00 Author:May | From:SeekIC

Conductivity of Taguchi TGS308 gas sensor increases in presence of combustible gases, increasing load voltage across R1 from normal 3 VRMS to as much as 20 V. Rise in voltage trips comparator to turn on transistor Q1 that supplies trigger current to 2N6070A sensitivegate triac. Resulting fullwave drive of Delta 1600316824-VAC horn gives sound output of 90 dB at 10 feet. Horn stops automatically when gas clears sensor.-A.Pshaenich, Solid State Gas/Smoke Detector Systems, Motorola, Phoenix, AZ, 1975, AN-735,p4.



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