Question: How does the fire alarm work?

Smoke alarms detect particles in the air. They most commonly do this using two types of detection technologies. The other type of commonly used detection technology is called photoelectric. This technology works by detecting light that is reflected off particles from a light beam inside the sensing chamber.

How does a fire alarm system works?

An ionization smoke detector senses electrically charged particles (ions) to detect smoke in the air. Once that occurs, the alarm is triggered. Over time, the sensor emits the light through the optical detectors chamber. If the light detects numerous smoke particles passing through it, then an alarm is triggered.

How do fire alarms detect fire?

When smoke enters the optical chamber into the path of the light beam, some light is scattered by the smoke particles, and some of the scattered light is detected by the sensor. An increased input of light into the sensor sets off the alarm.

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