What type of heat detectors are least prone to false alarms but are slow to activate?

Fixed temperature detectors are designed to activate when the temperature reaches a predetermined threshold. This characteristic makes them less susceptible to false alarms, as they will only respond to conditions where the temperature has risen to that specific level, typically indicating a fire. This differs from other types of heat detectors, which may respond to minor variations in temperature or environmental conditions that could lead to false alarms.

However, this design also means that fixed temperature detectors can be slower to activate compared to other types. They do not respond until the temperature has risen sufficiently high, which may take time during the early stages of a fire. In situations where rapid detection is crucial, this delay can be a disadvantage. Nonetheless, their reliability in avoiding false alarms makes them a preferred choice in environments where false activations could cause unnecessary disruptions or panic.