What is the purpose of a "smoke detector" in a fire alarm system?

The purpose of a smoke detector in a fire alarm system is to detect the presence of smoke as an indicator of fire. Smoke detectors are designed to sense smoke particles that enter the detector, which typically indicates a fire is either occurring or about to occur. Upon detection, the smoke detector will trigger an alarm to alert occupants of the potential danger, enabling them to take necessary actions such as evacuating the area or activating other fire safety measures.

While other options refer to important aspects of fire and life safety systems, they serve different functions. Monitoring carbon monoxide levels, for example, is a task for carbon monoxide detectors, which are distinct devices. Control of fire suppression systems pertains to mechanisms that directly engage firefighting systems like sprinklers but is not a responsibility of a smoke detector. Lastly, activating emergency lighting is a role for dedicated lighting systems designed to ensure visibility during an emergency, not the smoke detector itself. Understanding these distinctions highlights the specific and essential role that smoke detectors play in enhancing safety by providing early warnings about fire hazards.