6th December 2019

epa
18

What chemicals do smoke detectors detect?

Ionization smoke detectors use a small amount of radioactive material, americium-241, to detect smoke. Alpha particles from the americium source ionize air molecules, allowing positive and negative ions to flow between charged plates in the smoke detector.

Similarly, it is asked, how does a fire alarm system works?

The fire-detection system today consists of an FACP (fire alarm control panel) – this is the system's brain, and it's capable of making rapid decisions. The detection devices detect the presence of smoke or particles of combustion and then alert the FACP about a problem; the FACP then decides what action to take.

How does a smoke detector work?

How they work: Ionization-type smoke alarms have a small amount of radioactive material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm.

How does the smoke detector detect smoke?

Smoke Alarms: Smoke alarms will detect most fires more rapidly than heat detectors. There are currently three types of smoke alarms on the market: ionization, photoelectric and combination ionization/photoelectric. An ionization smoke alarm contains a small amount of radioactive material.
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