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PB-1191 Beam Detector Manual
Minimum distances between two pairs of detectors
The monitoring beam must not be mounted closer than 1 ft. to the ceiling, walls, installations, and
stored material.
In order to prevent the mutual interference of two or more PBA-1191 detectors where there is an
increasing distance between PBA-1191 and reflector, maintain an ever-increasing transverse distance
between PBA-1191 and reflector.
Figure 20
Minimum distance between two parallel IR beams
Beam spacing from the ceiling
In order for the IR beam to detect the smoke, it is normally mounted immediately beneath the cushion
of warm air. The higher the room, the further away the PBA-1191 and the reflector should be mounted
from the ceiling.
Figure 21
Distance from IR beam ⇒ ⇒ ⇒ ⇒ ⇒ flat ceiling (N < 0,2)
15
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