Menvier Security MBD50R Bedienungsanleitung Seite 4

Typical Minimum Beam Spacing
Beam Distance
10
20
30
40
50
In all installations the latest national fire standards must be consulted. If there is any doubt on the correct
3.1. Detector Positioning In Apex Of Sloping Ceiling.
A ceiling is defined as sloping if the distance from the top of the apex to the intersection of the ceiling and
adjacent wall is greater than 0.6 metres. See Fig. 1.
Slope if Χ Χ Χ Χ ≥ 0.6 Metres
When a Detector is positioned in the apex of a ceiling (See Fig. 2), the lateral beam distance covered (Υ) can
be increased in relation to the angle of pitch (Φ).
For Example:
If the pitch angle is 20 degrees, the lateral coverage can be increased from 7.5 metres either side of the beam
(Υ) to:
Υ = 7.5 + (7.5 x 20/100) metres
Υ = 9 metres
Therefore, with a roof pitch of 20 degrees the lateral coverage can be increased from 7.5 metres either side of
the beam to 9 metres either side of the beam, but only for the beam positioned in the apex. All other
calculations remain the same.
22318.31.01 21.04.06
Beam Spacing
0.87m
1.75m
2.62m
3.50m
4.37m
mounting height, positioning may be determined by smoke tests.
Χ Χ Χ Χ
Fig. 1.
Limit to when a beam detector must be positioned in
35.0
30.0
25.0
Beam detector must be positioned in
Angle of
20.0
Pitch
in degrees
15.0
10.0
5.0
Roof can be defined as flat
0.0
0 5
Width of Room in metres
Beam Distance
60
70
80
90
100
Υ Υ Υ Υ
Υ Υ Υ Υ (max) = 7.5 + (7.5 x Φ/100)
roof apex
10 15 20
3
Beam Spacing
5.25m
6.12m
7.00m
7.87m
8.75m
Υ Υ Υ Υ
Φ
Fig. 2.
25