e1276e
25
Siemens Building Technologies
Cerberus Division
09.2000
4.9 Minimum distances between two pairs of detectors
The monitoring beam must not be mounted closer than 30cm to the ceiling, walls, installa-
tions and stored material.
In order to prevent the mutual interference of two or more DLO1191 detectors where
there is an increasing distance between DLO1191 and reflector, maintain an ever-in-
creasing transverse distance between DLO1191 and reflector:
Distance DLO11.. and reflector
100
80
60
40
20
0 123456[m]
(m)
Fig. 20 Min. distance between two parallel IR beams
4.10 Beam spacing from the ceiling
In order that the IR beam can detect the smoke, it is normally mounted immediately be-
neath the cushion of warm air. The higher the room, the further away the DLO1191 and
the reflector should be mounted from the ceiling.
0.3 0.5 1.0 1.5
0
20
18
16
14
12
10
8
6
4
2
(m)
(m)
Room height
Sloping ceiling
(N > 0,2)
Flat ceiling
(N < 0,2)
Fig. 21 Distance from IR beam ⇒ ceiling
The steeper the gable roof, the greater the distance must be between the IR beam in
the gable and the ridge.
To Next Page
Loading...
