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Figure 21 Installation in a corridor with corners
9.7. Installation precautions
The following precautions are necessary when installing beam detectors:-
•
In a room where an air inlet is positioned in the ceiling the beam detector should be
placed near to the air inlet.
•
Select an appropriate installation place where the detector is unaffected by air being
drawn into a ventilated opening.
•
The distance between the receiver and the wall immediately behind the receiver
should be less than 11.5’.
•
If more than one detector is installed they must be positioned in such a manner that
they cannot affect each others operation.
•
The detector should be positioned such that it will not be affected by a shutter or
hanging wall.
•
The detector should be positioned such that it will be unaffected by moving objects.
•
The detector should not be installed in a roof top or place where open air circulates.
•
The detector should be installed where the distance between top and bottom of the
space is greater than 1.7’.
•
The monitoring distance between the emitter and receiver is 32.8’ to 328’ and the
maximum distance of coverage between the line of the beam is 23’.
•
If there is a probability of people walking in the area of the beam then the beam
detector should be installed at least 9’ from the floor.
•
The beam detector should not be installed at a height greater than 82’ unless the fire
detection system is connected directly to the fire brigade or via a central station and
rapid attendance by the fire brigade is possible. In any case the maximum installation
height is 131’.
