Helpful delay off relay for High-Risk Applications
Reliable delay off relay Designs for Industrial and Industrial Applications
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Jagu Bisunke asked In my kitchen I have to cook food, I want to make automatic exhaust fan when kitchen fill with smoke?
Regarding to above question, while cooking food I have to on/off exhaust fan manually but I want to have fully automatic circuit to controller the exhaust fan. When my kitchen get smoke (from burnt oil, burnt chilly etc.) the exhaust fan automatic on for five (5) minutes then off after 5 minutes. Could any body provide me the circuit diagram with parts list. I will be very grateful with you. Thank you very much for your cooperation in advance.
And got the following answer:
Although it sounds like a good idea it does have one drawback that you should consider. If the smoke is caused by a real fire you would NOT want the exhaust fan to come on automatically. I don't know of any device that is made that will do what you want. I suspect you could modify a smoke detector so that it would activate a relay rather than the alarm. This would require determining the voltage and current available from the alarm buzzer circuit. You would need to find a relay that could work using that available power. It would probably require some desoldering and soldering to connect the smoke alarm to the relay. You may be able to find a time delay relay that will work off the available power from the alarm circuit. If not you may need a separate time delay relay to provide the 5 minute on/off time. Note most smoke alarms have a small amount of radio active material. Please use caution if you decide to cut one open. There are smoke detectors typically used for industrial installations that have a built in relay for remote signaling. This may be an easier route since you won't need to do any modifications to the smoke detector itself. You would still need a timer. (See the last link below.) Mouser Electronics (link below) will have relays and timers.
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