Which type of heat detection system is generally considered the slowest?

A fixed temperature heat detection system is generally considered the slowest type of detection system. This is because it operates based on a predetermined temperature threshold. When the ambient temperature around the sensor rises to this specific level, the system activates to signal a potential fire.

This method lacks the capability to respond to rapid temperature changes that occur during the early stages of a fire because it does not initiate an alarm until the set temperature is reached. In contrast, other systems, such as rate-of-rise systems, can detect a quick increase in temperature, allowing for a faster response in case of a fire. Additionally, ionization and photoelectric systems utilize different mechanisms to detect smoke rather than relying solely on temperature. This makes the fixed temperature system the slowest among the available options.