FIRERAY
PRODUCT GUIDE
Page 7
4
Specify an Optical Beam Smoke Detector
4.1 Standards
The following guidelines are provided to give a general summary of common situations in which
Optical Beam Smoke Detectors are used.
There are many recognised National and International standards and Codes of Practise.
Please refer to your local authority for your applicable standards and codes
4.2
Coverage / Ceiling Height
Optical Beam Smoke Detectors generally have an operating range of up to 100 metres.
However, the optical concept means that the infrared light beam doesn’t suddenly drop at 100
metres but carries on, fading away progressively. With regards to the Reflected Optical Beam
Smoke Detector, the infrared light beam actually travels up to 100 Metres and back the same
distance.
Note:
Projected Optical Beam Smoke Detector can be offered with an extended range.
The recommended width of detection either side of the infrared light beam axis is 7.5 metres for
satisfactory detection under flat ceilings (see section 4.3 Location, Spacing and Positioning for
distances to be considered in some general applications)
Optical Beam Smoke Detectors are ideally suited for high ceiling applications, where their infrared
light beam path is less likely to be obstructed.
High Ceiling applications such as atriums, lobbies, gymnasiums, sports arenas, museums, factories
and warehouses are areas where Optical Beam Smoke Detectors are not only acceptable, but are
the detector of choice.
4.3 Location,
Spacing and Positioning
It is important that the Optical Beam Smoke Detector is positioned correctly to minimise the detection
time
Experiments have shown that smoke from a fire does not rise directly upwards, but fans out as a
plume due to dilution with cool air and heat layering effects.
The time to signal a fire condition depends on the location of the Optical Beam Smoke Detector
within the premises, the volume and density of smoke produced, construction of the roof ventilation
arrangements and airflow within detection area.
Summary of Contents for FIRERAY 100R
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