What type of temperature detection does a fixed temperature heat detector rely on?

A fixed temperature heat detector relies on a predetermined temperature threshold to activate. This type of detector is designed to respond when the surrounding temperature reaches a specific level that has been set by the manufacturer. When the temperature exceeds this threshold, typically due to a fire, the detector will signal an alarm.

The reason a predetermined temperature threshold is essential is that it provides a straightforward and reliable means of detecting the presence of heat associated with a fire. These detectors are often used in areas where rapid changes in temperature are not expected and where continuous monitoring is not as critical. In contrast, dynamic temperature changes would relate more to rate-of-rise detectors, which monitor how quickly the temperature increases rather than a specific set point.

Surrounding air pressure and heat generated by smoke are not relevant factors for fixed temperature heat detectors; they operate solely based on the ambient temperature exceeding a set limit. This makes fixed temperature detectors a simple and effective solution for specific fire alarm applications.