Smoke detector

The Gamewell-FCI projected beam smoke detector offers vital fire detection in applications where spot-type detectors are not adequate. This model is four-wire, 24 VDC and includes both the transmitter and receiver. Features include automatic compensation for signal drift or dirty lens, alignment LEDs for simple setup and adjustment and three field-adjustable sensitivity settings. This detector provides linear protection from 30 to 320 feet (9.144 to 97.539 m). Operation The infrared signal is sent from the transmitter via an optical system. At 320 feet (97.536 m), the diameter of this infrared signal is approximately 9.5 feet (2.896 m). The wide angle beam arrangement simplifies alignment and increases stability. It is important that the projected beam smoke detector is positioned correctly to minimize the detection time. Experiments have shown that smoke from a fire does not rise directly upwards. The smoke fans out in a “mushroom” shape due to air currents and heat-layering effects. A fire alarm condition occurs when the smoke obscures the infrared beam. The time to detect a fire condition depends on the location of the smoke beam within the premises, the volume of smoke produced, the construction of the roof, and ventilation considerations.