What do rate-of-rise and fixed-temperature refer to?

Rate-of-rise and fixed-temperature are terms specifically associated with heat detectors. These types of detectors are designed to sense temperature changes in their environment to identify the presence of a fire. Rate-of-rise heat detectors trigger an alarm when the temperature increases by a certain rate within a specified time frame, making them effective for detecting fast-developing fires. On the other hand, fixed-temperature heat detectors are set to activate an alarm when the temperature reaches a predetermined threshold, regardless of the rate of temperature rise. This functionality allows heat detectors to differentiate between normal fluctuations in temperature and the rapid increases indicative of a fire, ensuring timely responses to potential fire hazards.

In contrast, smoke alarms primarily detect smoke particles, while water pressure sensors monitor water levels or pressures, and fire extinguishers are equipment used for suppressing fires. Each of these serves a different function in fire safety and response, highlighting the uniqueness of heat detectors in their specific reliance on temperature changes.