Post AS8Df7fnQ87VvJIQee by dragon@toot.dragon2611.net
(DIR) More posts by dragon@toot.dragon2611.net
(DIR) Post #AS7CoI99YUjZtssNN2 by stux@mstdn.social
2023-01-28T22:07:58Z
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Recently our whole neighbourhood got new smoke detectors and they are soo sensitive that constantly you'll hear the alarm beeping somewhere 🚨 Not sure it's such a good thing though :blobcatgiggle: IF it's real, no one does a thing anymore
(DIR) Post #AS7D7KhKIJClJZwKSe by Tedgarrison3@mstdn.social
2023-01-28T22:11:30Z
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@stux Newer ones are supposed to be more sensitive, but also more smart, so they don't go off due to NOT-FIRES.
(DIR) Post #AS7DyiuD1MFnk3QM5I by FediThing@tech.lgbt
2023-01-28T22:21:08Z
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@stux We used to have a boss who worked through smoke alarms, never took any notice even though they were REALLY REALLY LOUD 😱 The rest of us would stand outside the building until the alarm stopped, watching her typing inside.
(DIR) Post #AS7EC6A9rWaZdaGIXQ by photonstopper@mastodon.art
2023-01-28T22:23:33Z
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@stux Worse, they may disable them to avoid the false alarms!
(DIR) Post #AS7FjrOzLh75eprTPs by Basic_Bench@mstdn.social
2023-01-28T22:40:52Z
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@stuxThat sounds like a safety issue that will train people to ignore or disable the alarms.
(DIR) Post #AS7HVQ1SY3Zeb066LY by schmidt_fu@mstdn.social
2023-01-28T23:00:39Z
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@stuxAre there many #woodstove s in your neighbourhood? They release lots of smoke and toxic particles.
(DIR) Post #AS7IgiB9U3IC2va0Js by DToher@mastodon.ie
2023-01-28T23:13:54Z
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@stux as a grad student we moved into a brand new building with very sensitive fire alarms in the high performance computing server room.In the first year in the building we spent so much time waiting outside to be allowed back in, several times a week. We would grab everyone's coats and bags to ensure that we could, at a minimum, get home if things were taking an age.It would take *a minimum of 30 minutes* and often longer; and that was only starting the timer once everyone left the building.
(DIR) Post #AS7PwsxjrDn5nsxtvk by Structure7780@mat.random101.net
2023-01-29T00:35:15Z
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@stux that horrible at that point they might as well not exist
(DIR) Post #AS7cEHWgywjIMMNNFQ by publius@mastodon.sdf.org
2023-01-29T02:52:56Z
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@stux I'm guessing these are "optical" rather than "ionization" type. Across Europe, the effective and reliable "ionization" detectors are being replaced by "optical" detectors, because of fear of the artificial transuranium element, americium, which they contain in small quantities.
(DIR) Post #AS8Df7fnQ87VvJIQee by dragon@toot.dragon2611.net
2023-01-29T09:22:47Z
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@publius @stux depends on the type of fire https://youtu.be/DuAeaIcAXtg
(DIR) Post #AS9AQ3k9dwr2ggQ7xA by publius@mastodon.sdf.org
2023-01-29T20:50:45Z
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@dragon @stux I simply don't understand why this guy is so weirded out by the use of a radioisotope for a simple household task. The attitude baffles me.Anyhow, while a photoelectric detector is a useful adjunct, I would never trust a photoelectric detector in a critical application, because they do not reliably fail to safety. The ionization chamber approach is far more robust and reliable.
(DIR) Post #AS9DEOy3CrUMtt3LmK by publius@mastodon.sdf.org
2023-01-29T21:22:15Z
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@dragon @stux To be more clear :The ionization detector alarms on low current. That is, it detects the ABSENCE of something. As such, interrupting the current to the chamber tests the whole alarm mechanism.The photoelectric detector alarms if it detects scattered light ― the PRESENCE of something. This detection may fail silently, if the light source or photodetector fails, or from some other cause, such as vapour condensation on the source or detector. "A negative can never be proven."