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

A smoke detector is categorized as an environmental sensor. This type of sensor detects changes in the environment, such as the presence of smoke, which is indicative of a fire. Environmental sensors are designed to monitor various factors like smoke, temperature, humidity, and air quality to provide safety and alert users to harmful conditions.

In contrast, while security sensors are primarily focused on detecting unauthorized access or breaches in a physical space, smoke detectors serve a more protective function specifically related to fire safety. Hence, categorizing a smoke detector as a security sensor would overlook its primary role in environmental monitoring rather than security per se. Understanding the specific purpose and function of the smoke detector is key to accurately categorizing it within alarm systems.