What technology is often used in a fire alarm system?

Heat detectors are an integral part of fire alarm systems, as they are specifically designed to monitor temperature changes in an environment. When a fire occurs, it generally produces a rise in temperature. Heat detectors sense this increase and trigger the alarm to alert occupants and emergency services, facilitating a prompt response.

In contrast, while video cameras can assist in monitoring building conditions, they do not directly detect fires. Infrared sensors might have applications in fire detection, but they are not standard components of traditional fire alarm systems, which primarily focus on more direct indicators of fire like heat and smoke. Sound systems may be deployed to alert individuals to a fire, but they do not serve the function of detection; instead, they are part of the notification process after a fire has been detected. Thus, heat detectors remain the foundational technology in fire alarm systems for their direct role in sensing the presence of fire conditions.