What is the primary function of a photoelectric smoke detector?

The primary function of a photoelectric smoke detector is to use a light beam and photocell to detect larger, visible particles of smoke. This type of smoke detector operates by directing a beam of light into a sensing chamber. When smoke enters this chamber, it scatters the light beam, causing the photocell to detect the change in light intensity. The presence of smoke particles triggers the alarm, making photoelectric smoke detectors particularly effective for detecting smoldering fires that produce larger smoke particles.

Understanding this mechanism is essential for effective fire safety practices, as it highlights the importance of installing the right type of smoke detector based on the specific risks present in an environment. Other options provided, such as detecting gas leaks or measuring temperature changes, pertain to different types of safety devices that serve unique functions in fire safety and life safety systems. Visual warnings are typically associated with systems that provide alerts such as strobe lights or alarms but do not encompass the primary detection function of photoelectric smoke detectors.