Detection Of Smouldering Fire In High Rooms; Guideline For Distances Between Dlo1191 And Reflector - Siemens Cerberus DLO1191 Manual

4.6.3

Detection of smouldering fire in high rooms

4.7

Guideline for distances between DLO1191 and reflector

22
Siemens Building T echnologies
Cerberus Division
In order that smouldering fires or smaller fires with weak thermal current can be detected
even in high rooms, a second or a third IR beam must be arranged at the assumed height
of the spread of smoke of a smouldering fire. This application can be useful for rooms
>6m in height.
Fig. 17 Detection of smouldering fires in high rooms on different levels
Examples:
Room height
(highest level)
6m
12m
20m
Distance DLO1191 à reflector
5 – 10m
10 – 30m
30 – 50m
50 – 65m
20 – 100m
If a number of reflectors are used they must be arranged close together and in the form of
a square. Distances are approximate, i.e. they depend on detector and reflector toler-
ances and can easily vary by a few metres. The important thing is that sufficient signal
strength is achieved.
lowest level intermediate level
3 – 4m
6 – 7m
6 – 7m
Types and number of reflectors
Short distance filter + 1 DLR1193
–
–
~12m
1 DLR1193
1 DLR1192
4 DLR1192
1 DLR1191
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09.2000