e1276e
26
Siemens Building T
echnologies
Cerberus Division
09.2000
4.11
Maximum monitoring width
The monitoring width can be increased with increasing room height.
Room height or mounting height
20
15
12
10
8
6
4
3
(m)
(m)
8
10
11
12
13
14
15
9
max. monitoring width
Fig. 22 Monitoring width dependent on the room height
If the monitoring beam is set at a low level in order to detect smouldering fire, then instead
of room height the distance between floor and detector applies. However, to cover in-
creased risks a narrower monitoring width can be chosen.
4.12
Measures for dividing long distances
DLO
DLO
DLR
DLO1191s can negatively influence each other if mounted face-to-face. In such an ar-
rangement a sufficiently large plate must be mounted between the reflectors.
4.13
Measures against condensation
If the DLO1191 or the reflector is mounted on cool outside walls, in rooms in which high
humidity and rapid increase in temperature (e.g. sunshine on non-insulated roof) are to
be expected, the detector heating unit DLH1191 must be used to prevent. Condensation
of the front cover cause trouble or false alarms. For this application and for short dis-
tances, use the reflector DLR1191 with built-in heating.
