What is a 'rate of rise detector'?

A rate of rise detector is a type of heat detector specifically designed to monitor rapid increases in temperature. This device functions by detecting how quickly the temperature rises in a given environment, which is a critical factor in early fire detection.

When a fire starts, it often creates a swift rise in temperature before significant smoke is produced. The rate of rise detector is calibrated to react when the temperature exceeds a predetermined threshold at an accelerated rate, indicating an increased likelihood of fire. This characteristic makes it particularly useful in settings where smoke detectors may be prone to false alarms, such as kitchens or dusty environments.

The other options do not accurately describe the function or characteristics of a rate of rise detector. For instance, while some detectors do sense smoke particles, that is not the function of a rate of rise detector. Similarly, a continuous fire alarm does not specifically refer to detection methods, and a visual indicator of fire risk does not encompass the thermal detection capabilities unique to rate of rise detectors.