e1276e
19
Siemens Building T
echnologies
Cerberus Division
09.2000
4.4
Monitoring areas with flat ceilings
Max. width of monitored
area determined by height
of room (section 4.11)
Distance from ceiling min. 30cm,
max. 60cm for rooms <10m high
(section 4.10)
Distance between DLO11.. and
reflector 5 ... 100m
Min. gap between two parallel
beams determined by distance
DLO11.. and reflector
(section 4.9)
min. 30cm
Fig. 11
Detector layout in areas with flat ceilings
4.5
Monitoring areas with sloping ceilings
To be defined as «sloping», a ceiling must have an angle of inclination of at least 11
°
which corresponds to 20cm/m. With gable roofs which have a slope of >0.5, always ar-
range a monitoring beam in the gable area.
Example:
Calculation of the slope n
4.5.1
Additional DLO1191’s on the slope of the ceiling
The number of DLO1191’s required results from the maximum permissible monitoring
width shown in section 4.11
1/4
1/4
1/4
1/4
Fig. 12 Arrangement with 3 monitoring beams on a sloping ceiling
a
n
b
n
+
a
b
ǒ
4m
10m
+
0, 4
Ǔ
