What type of alarm system automatically detects smoke?

Automatic fire alarm systems are specifically designed to detect smoke, heat, or flames without the need for manual intervention. These systems utilize various types of sensors, such as smoke detectors and heat detectors, which actively monitor the environment for signs of fire. When smoke is detected, the system triggers an alarm to notify occupants and, in many cases, can also alert emergency services automatically.

In contrast, manual alarm systems require someone to physically activate the alarm, which does not provide the same level of immediate response as automatic systems. Emergency alarm systems might refer to broader categories of alerts, including those for different emergencies, but they don't specifically denote the automatic detection of smoke. Battery-operated alarm systems can be a type of automatic system, but they may not incorporate all the sophisticated features of a more comprehensive automatic fire alarm system. Thus, the defining characteristic of automatic fire alarm systems is their ability to detect smoke and respond autonomously.