It could be broken, or the battery may be dead.
Then it wouldn't be a smoke detector, but there are fire alarms that are triggered by temperature.
Sure, but what you would have to do would be to put the switch in the TEST circuit of the detector.
You have to test it frequently, the reason is that smoke may be visible or may be not and you want to see all particles that emanate from any kind of smoke, specially during night time when you are asleep. Most of dust/ash particles may not be visible and via ionizing detector they will be!!!! Alarm will go off making alert sound and you will be safe. So, sumirizing, you need to test ionizing smoke detector to see if sensor is in ok condition.
large,thick things produce a low pitch sound
if you take the smoke detector down there should be a list of of light and sound sequences refer to that.
from experience, too much heat,moist or dust affect the performance of smoke detectors and can easily activate the detector.
A sound detector.
It is a photocell set to read clean air if smoke interfere with the light an alarm will sounds is the basics anyhow
Sound detector
metal detector
when my bike stand outside at 60°c a whistling sound comes from fuel tank cap. could you tell the reason?
Sonar detector.