this post was submitted on 10 Nov 2025
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Parts?
Anyhow, they have a 10 year lifetime. You can’t repair it.
Don't these things run off of decaying isotopes? I don't think you can fix that
If I could turn back time, if I could find a way
I'd take back those words that have hurt you
They run off batteries, using either isotope decay or light sensor (or both)
I actually have one hanging off my ceiling right now, it's battery was fine, but it tripped likely due to dust or a spider on the optical sensor. It went off at 2am, network sent them all off, took me 10m to find the right one I wasn't about to just blow it out and out put it back on the ceiling :)
Depends on model. Almost all older ones does (using radiation from the isotope to electrically charge smoke particles that pass through, which then can be detected by a sensor).
Many newer ones are optical.
The A-241 does not charge the particles, it ionizes the air in a small chamber that allows a steady current. Any smoke particles disrupt these currents to set off the alarm.
where there's a will there's a way
"Jerry, we have thousands of warheads full of plutonium"
Don't know what it's like where you live but around here if they are old enough to fall apart they aren't to code anyway. They need replacing like every two years, I think.
Seven to ten years, depending on manufacturer. The newer ones use a lithium battery and last ten years.
Our floor plan + regulations made for a stupid setup. All three bedrooms and hallway require an alarm. All 4 are within 8' of each other.
And there isn't one in the kitchen!
Afaik, it's not recommended to have them in kitchens, because harmless culinary mistakes can set them off so people end up disabling them in annoyance. You have to have one in a common area on every floor, but ideally not the kitchen.
The ones in the kitchen will be set off by burnt food... Leading to people disabling the alarm anyway.
In your kitchen you can get heat sensitive fire alarms instead.
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