What are the two types of smoke alarm devices?

The correct answer identifies the two main types of smoke alarm devices as ionization detectors and photoelectric detectors.

Ionization detectors are designed to be more sensitive to fast-burning fires, such as those involving flammable liquids or paper. They use a small amount of radioactive material to ionize the air inside the sensing chamber. When smoke enters the chamber, it disrupts this ionization process, triggering the alarm. This type of smoke alarm is very effective at detecting flames quickly.

On the other hand, photoelectric detectors are better at sensing smoldering fires that produce a larger amount of smoke before flames erupt. These alarms operate using a light source and a photosensitive sensor. When smoke enters the chamber, it scatters the light beam, causing the sensor to trigger the alarm.

Together, these technologies provide comprehensive protection against various types of fire scenarios, emphasizing the importance of having both types of detectors installed for enhanced safety in any environment.