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 Is the smoke and fire alarm necessary?
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jones
Starting Member

USA
7 Posts

Posted - 11/16/2017 :  7:35:03 PM  Show Profile  Reply with Quote
I purchased some smoke and fire alarm, which is battery powered, but till now i do not know if it works, cause i never hear the alarm.

stusviews
Advanced Member

USA
15854 Posts

Posted - 11/16/2017 :  7:39:30 PM  Show Profile  Visit stusviews's Homepage  Reply with Quote
The alarm shouldn't sound at all unless there's sufficient smoke or a fire or weak batteries. But every alarm has a test button that's explained in the included instructions.

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jones
Starting Member

USA
7 Posts

Posted - 11/16/2017 :  7:44:39 PM  Show Profile  Reply with Quote
thank you, which brand smoke alarm do you suggest?
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stusviews
Advanced Member

USA
15854 Posts

Posted - 11/16/2017 :  7:48:44 PM  Show Profile  Visit stusviews's Homepage  Reply with Quote
You indicated that you already purchased the alarms. Is there a problem with those?

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jones
Starting Member

USA
7 Posts

Posted - 11/16/2017 :  7:50:57 PM  Show Profile  Reply with Quote
i don't know if it is still within the working time, there is no produce date on the package, i want to change them.
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stusviews
Advanced Member

USA
15854 Posts

Posted - 11/16/2017 :  8:21:49 PM  Show Profile  Visit stusviews's Homepage  Reply with Quote
Why? What brand/model did you purchase? Be specific.

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Kenny
Starting Member

2 Posts

Posted - 11/19/2017 :  6:04:50 PM  Show Profile  Reply with Quote
I can suggest you some brands i ever used, like Kidde, First Alert, Ardwolf and so on, hope this helpful
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jones
Starting Member

USA
7 Posts

Posted - 11/20/2017 :  11:30:07 PM  Show Profile  Reply with Quote
thank you Kenny, i'll think about it.
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C03T07C12
New Member

USA
20 Posts

Posted - 07/01/2018 :  12:32:50 PM  Show Profile  Reply with Quote
A few tips.

1) Smoke alarms expire after about 10 years or 87,000 hours of service. Check the expiration date on the device before using.

2) The National Fire Protection Association (NFPA) recommends testing devices monthly. Additionally, many experts suggest replacing alarm batteries twice a year.

3) As STUSVIEWS mentioned, all smoke alarms have a test button, but make sure you’re wearing ear plugs before pressing.

4) Smoke detectors typically fall within two categories: photoelectric and ionization. When it comes to disposal, old photoelectric detectors can be safely put in the trash, so long as you remove the battery first. Ionization detectors contain a small amount of the man-made, radioactive material called Americium-241. This type should never be thrown in the trash. Contact your local waste disposal agency to see if they have a place that accepts this type of smoke detector for recycling.

Good luck...
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jamie225
Starting Member

USA
1 Posts

Posted - 07/17/2018 :  05:31:33 AM  Show Profile  Reply with Quote
because it is never triggered

James Thompson 117
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Geo
Advanced Member

Canada
803 Posts

Posted - 07/17/2018 :  06:12:05 AM  Show Profile  Reply with Quote
Just a few corrections:
1) Whether a smoke alarm is triggered or not does not affect its overall life, because it's working, by monitoring particle levels, all the time. Only the alarm device itself i.e. the beeper, the buzzer, which, in fact, may never work during the life except when the detector is tested, may have limited life. The mechanical buzzers used years ago were rated for just a few hours of continuous operation, present day piezoelectric buzzers will last much longer (and take much less power) although I do not know their rating.
2) Smoke alarms (ionization or photoelectric) do not expire after ten years of service. The radioactive source Am241 has 242 years half life, the electronic circuits (if properly designed) are not exposed to any significant stress - when I calculated a smoke detector's MTTF (mean time to failure) some years ago, the statistical value came to several million hours. Photoelectric detector results are similar.
3) However, one can assume that the detection chamber of any type of a smoke detector will, over time, accumulate enough cobwebs, dirt and dust for the detector to become ineffective. It could of course be cleaned, but if we consider ageing, drifts and the cost of a new detector, purchasing a new device seems like a better alternative.
4) Ionization detectors contain a fraction of uCi (micro Curie) of Am241. The element is hermetically encased in a thin gold foil, which prevents anyone from touching it. In addition, present day detectors are designed such that opening the sensor chamber itself and getting access to the source is also quite difficult. That said, with millions of ionization smoke detectors out there, authorities must control their disposal.
5) Ionization and photoelectric detectors do have different characteristics as far as detecting fire is concerned. It is a good idea to have both. At one time one could buy combination photo/ionization detectors.

GJN
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