Heat detectors are a necessary part of any fire alarm system. Federal Signal models FSF100SB and FSF101SB Heat Detectors provide a durable, architecturally pleasing solution. Each detector is available with, as standard, both rate–of–rise and fixed temperature sensors. The FSF100SB Heat Detector contains a 135º fixed temperature element and the FSF101SB Heat Detector contains a 200º fixed temperature element.

Rate–of–rise refers to how quickly the detector will sense a rapid rise in temperature and close its contacts. The pneumatic rate–of–rise element within the FSF100SB and FSF101SB will respond to a rise in temperature, approximately 15ºF (8ºC) per minute, by measuring the expansion of air within a sealed chamber. This increase in pressure depresses a diaphragm, causing an electrical contact to close the circuit. In addition to the rate–of–rise detection, each model has a fixed temperature element. The fixed temperature element incorporates a fusible alloy. When activated, the external heat collector drops away to provide quick visual confirmation that the element has operated.

Each FSF Heat detector incorporates a slim profile, designed to be unobtrusive and minimize potential overhead obstruction. The included mounting plate is designed to fit a 4 square junction box, 3–1/4 octagon box or plaster ring and adapts easily to uneven mounting surfaces.