Circuit principle gas furnace flameout alarm circuit

Published:2011/6/8 8:56:00 Author:Christina | Keyword: Circuit, principle, gas furnace, flameout, alarm | From:SeekIC

Although some advanced gas furnaces have the automatic flameout protection device, but the price is too high so they are difficult to popularize. The gas furnace flameout alarm circuit is as shown in the figure, this circuit can monitor the gas furnace and alarm. The circuit's core device is the LM324 quad op amp. The IC1-1 is used as the comparator, the IC1-2 is used as the follower; the R4 and R5 are the photoresistor, the resistance changes with the light intensity; AN is the reset switch, AN can be used to discharge the electric charges of capacitance C1 and C2; when you are using it, you need to aim the photoconductive resistance R4 at the flame, then turn the adjusting knob to make the alarm will not alarm. If you use your hand to keep out the flame, the alarm will alarm. This circuit uses the 9V lapped battery.



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