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SMOKE DETECTOR
9
DESIGN RECOMMENDATIONS
The D-BM100 beam smoke detector operates properly (like all other smoke detectors), in case it is installed
at the height not exceeding 12 m. When it is mounted higher (up to 20 m), additional detectors shall be
provided at an intermediate level.
Maximum width (2D) of an area protected by one detector depends on the room height, according to the
following table:
Height
H
Up to 6 m
From 6 to 12 m
Over 12 m
In case the distance between detector and set of reflectors is 100 m, the maximum area protected by one
detector for the 10 m ceiling height is ca. 1300 m
smoke detectors.
The distance between the detector IR beam and a side wall of room should not exceed D value and between
two adjacent detector beams – 2D. The distance from the IR beam to any obstacle (e.g. a wall, perpendicular
to a side wall) shall not be shorter than 0.5 m.
The beam detector should constantly "see" the co-operating reflector. It is required to install it in such a way
that its optical path is never – even temporarily – concealed by a moving object or equipment, such as cranes,
hoists, etc. In the premises, where people are present, the minimum installation height is 2.7 m (outstretched
upwards arms will not disturb the optical path). This limitation is not valid in case of low, long or narrow
spaces where people are not present, e.g. cable channels, spaces above hanging ceilings, etc.
NOTE: The data listed in the table, especially the D operation radius value, come out from the calculations of
the proportion of the beam detector arrangement versus spot detectors installed in a fire test chamber and
comply with the data pursuant to VdS 2095:2005.
It differs from the data stated in the PKN-CEN/TS 54-14 technical specification in which the D radius is the
same for all heights and is equal to 7.5 m.
Doc:UM-D-BM100-0717-EN
Operation radius
D
6 m
6.5 m
7 m
2
, (2D x 100 m) so the detector can replace a dozen of point
DEKON D-BM100 OPTICAL BEAM
Distance from ceiling
At gradient up to 20°
0.2 m to 0.5 m
0.3 m to 0.7 m
0.6 m to 0.9 m
At gradient over 20°
0.3 m to 0.5 m
0.4 m to 1.0 m
0.8 m to 1.2 m
Page 9/16
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