A rate of rise heat detector activates after detecting what degree rise in temperature within one minute?

A rate of rise heat detector is designed to respond to rapid increases in temperature, which can indicate the presence of a fire. The typical activation criterion for a rate of rise heat detector is to activate when there is a rise of 15 degrees Fahrenheit (or Celsius, depending on the context) within one minute. This threshold is established to ensure that the detector responds quickly to heat that increases at an abnormal rate, which could signify an impending fire situation.

The significance of this criterion is that it allows for timely alerts in environments where fast-changing conditions could pose a risk, helping to ensure safety and prompt action. Such detectors are particularly effective in areas where sudden temperature changes can occur, ensuring that a fire is detected early, thereby enabling faster response times for evacuation or fire suppression efforts.