Heat Stage

Heat is the last and most hazardous stage, when the fire is burning openly. Great heat, incandescent air, and smoke are all present. The heat stage follows the smoke

stage, and since smoke is responsible for most fire deaths, waiting for heat is dangerous. Heat-actuated detectors, also called thermal, thermostatic, or temperature detectors, operate like the fusible link in a sprinkler head. They are used to detect rapid temperature rise fires.

Spot units are mounted in the center of a space, such as separated, unoccupied areas. Linear units are cable-like elements that sense heat along their entire length. They can sense the overheating of an object without fire, and are used in cable trays and bundles, and for large, long equipment.

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