What type of detector is mounted on the ceiling or wall and reacts to convected thermal reactions?

A heat detector is specifically designed to respond to changes in temperature caused by thermal energy in the environment, such as that generated by fire. These detectors can be either fixed temperature or rate-of-rise types. The fixed temperature model triggers an alarm when the ambient temperature reaches a predetermined threshold, while the rate-of-rise model detects a rapid increase in temperature within a specified time frame.

Mounting on a ceiling or wall is significant as heat naturally rises, allowing ceiling-mounted detectors to effectively detect heat from fire or other heat sources. In environments where smoke or gas accumulation may not be suitable for other types of detectors, heat detectors provide a reliable means of alerting to potential fire hazards by relying solely on temperature changes rather than smoke particles or combustion gases. This makes heat detectors particularly useful in areas where smoke alarms might cause false alarms, such as kitchens and garages.