The Advantages of a Dual-Action Heat Detector

Rate-of-Rise Feature

• The rate-of-rise feature on dual-action heat detectors responds to fires that rapidly grow in heat and intensity. When the temperature of a room with a dual-action heat detector increases at a sudden and rapid rate exceeding 15 degrees per minute, the detector activates its alert system to warn the people in the room and the fire department of the fire hazard.

Fixed-Temperature Feature

• A dual-action heat detector has a fixed-temperature feature that functions as a method of detecting fire hazards which grow and develop slowly and gradually. When a set temperature limit is reached, a phosphor and a bronze spring held under tension by fusible eutectic alloy melts and activates the alarm.

Dual Action

• While single-action heat detectors are only equipped with either a rate-of-rise function or a fixed-temperature feature, dual-action heat detectors are equipped with both functions. Capable of using these two independent methods to effectively detect fires and smoke hazards, dual-action heat detectors activate their alert systems to assert warnings for both gradual fire hazards that develop slowly and for intense fires that ignite and spread rapidly.