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Smoke alarm (optical) from #AliExpress failed the smoke test. It feeps loudly when pushing the test button, but when held into some nice fire smoke, it does exactly nothing, despite patience.
So always test with a real life scenario. The test button only checks the batteries and the beeper are working, not the actual sensor.
I sent them a nice video and expect a refund. This isn't because it's from China, the same can happen with any.
@yngmar optical smoke sensors really only work on smouldering fires, not on hot burning fires. It's one of the drawbacks of the optical tech. You need an ionization detector for hotter, cleaner burning fires. Ideally you want a combination of both or dual-sensor alarms.
@earthshine I'm quite aware of the differences. Optical ones work on smoke, or more precisely, anything obstruction visibility, such as steam or even an inconveniently placed mote of dust.
That is why I wrote "smoke". Which I assure you, there was plenty of (on purpose, for this test, which the alarm failed).
I do put some effort into my writing and would appreciate the same when reading.
@yngmar @earthshine A vape will set off most smoke alarms when close enough (not suggesting you take up vaping to try this if you don't already, but I have managed to do this myself (in a controlled fashion with a standalone smoke alarm, not getting places accidentally evacuated which has also happened)