What type of fire detection system is noted for experiencing thermal lag?

In the context of fire detection systems, the concept of thermal lag refers to the delay between the actual increase in temperature due to a fire and the response of the detection system. A fixed temperature system is designed to activate when the temperature reaches a predetermined threshold. The nature of this system means that it may not respond immediately to a fire, particularly if the heat rise is gradual, which is often the case.

Thermal lag occurs because the sensing element in a fixed temperature heat detection system needs to reach the predetermined temperature before it can signal an alarm. This delay can be problematic, especially if the fire develops quickly or if there is poor heat transfer to the sensor. In contrast, other types of detection systems, such as smoke detection or multi-sensor systems, respond more quickly to the presence of smoke or a variety of signs indicating a fire.

Understanding thermal lag is crucial for safety professionals when evaluating fire detection systems, as it highlights the importance of selecting the right type of system based on the environment and potential fire risks. This knowledge ensures that appropriate measures can be taken to protect life and property effectively.