Minimum Distances Between Two Pairs Of Detectors; Beam Spacing From The Ceiling - Siemens Cerberus DLO1191 Manual

4.9

Minimum distances between two pairs of detectors

4.10

Beam spacing from the ceiling

Siemens Building T echnologies
Cerberus Division
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
(m)
100
80
60
40
20
0 1 2 3
Fig. 20 Min. distance between two parallel IR beams
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.
Room height
(m)
20
18
16
Flat ceiling
14
(N < 0,2)
12
10
8
6
4
2
0
0.3 0.5
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.
4 5 6 [m]
Sloping ceiling
(N > 0,2)
1.0 1.5 (m)
25
e1276e
09.2000