Ampac FIRERAY 100R, Product Manual

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FIRERAY PRODUCT GUIDE
Page 13
There is no sure way of identifying what condition will be present at the start of a fire. Any of the
following detection schemes can provide for prompt detection regardless of the condition present at
the time of fire initiation.
Upward Optical Beam Smoke Detectors to Detect the Smoke Layer:
The purpose of this approach is to quickly detect the development of a smoke layer at whatever
temperature condition exists. One or more Optical Beam Smoke Detectors are aimed at an upward
angle to intersect the smoke layer regardless of the level of smoke stratification. For redundancy
when using this approach, more than one Optical Beam Smoke Detector is recommended.
Horizontal Optical Beam Smoke Detectors to Detect the Smoke Layer at Various Levels:
The purpose of this approach is to quickly detect the development of a smoke layer at whatever
temperature condition exists. One or more Optical Beam Smoke Detectors are located at the ceiling.
Additional Optical Beam Smoke Detectors are located at other levels lower in the volume. The exact
positioning of the Optical Beam Smoke Detectors is a function of the specific design but should
include Optical Beam Smoke Detectors at the bottom of any identified unconditioned (Dead air)
spaces and at / or near the design smoke level with several Optical Beam Smoke Detectors
positions at other levels
Horizontal Optical Beam Smoke Detectors to Detect Smoke Plume:
The purpose of this approach is to detect the rising plume rather than the smoke layer. For this
approach, an arrangement of Optical Beam Smoke Detectors close enough to each other to assure
intersection of the plume is installed at a level below the lowest expected stratification level. The
spacing between Optical Beam Smoke Detectors is based on the narrowest potential width of the
plume at the level of detection.