What is the primary function of a photoelectric smoke detector?

The primary function of a photoelectric smoke detector is to identify visible products of combustion using light. This type of detector utilizes a light source and a light sensor within a sensing chamber. When smoke enters the chamber, it scatters the light beam, which is then detected by the sensor. This scattering effect triggers the alarm, indicating the presence of smoke.

Photoelectric smoke detectors are particularly effective at detecting smoldering fires that produce larger smoke particles, making them reliable for early detection of fires before they escalate. In contrast, options that involve monitoring temperature variations or analyzing carbon monoxide levels pertain to different types of safety devices and detection technologies. The chemical analysis of smoke is not a function of photoelectric detectors, as they do not assess the composition of the smoke, but rather detect its presence through light interference. Understanding these distinctions highlights the unique capabilities of photoelectric smoke detectors in fire safety and prevention.