What type of alarm sensors would you categorize a smoke detector under?

A smoke detector is categorized under environmental sensors. This classification is based on the function of smoke detectors, which is to detect the presence of smoke as an indication of fire, thus monitoring environmental conditions for safety. Smoke detectors are essential in warning individuals about potentially dangerous situations, making them a crucial part of safety systems.

While they can be part of a security system, they primarily serve to monitor the environment for hazardous conditions, distinguishing them from traditional security sensors designed specifically for detecting unauthorized entry or motion. This is why environmental sensors is the more accurate classification for smoke detectors.