9
INSTALLATION AND OPERATION MANUAL
25-16383-B August 2019 www.eaton.com
3. Detector positioning
When a Detector is positioned in the apex of a ceiling (See Fig. 2), the lateral beam
distance covered (
8
) can be increased in relation to the angle of pitch (
)
), up to
a maximum of 25%.
Figure 2.
For example:
If the pitch angle is 20 degrees, the lateral coverage can be increased from 7.5
metres either side of the beam (
8
) to:
8
= 7.5 + (7.5 x 20/100) metres
8
= 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.
Limit to when a beam detector must be positioned in roof apex
Υ
Υ
Υ
(max)= 7.5 + (7.5 x
Φ
/100)
Fig. 2.
Φ
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
5
2
0
2
5
1
0
1
5
0
Width of Room in metres
Angle of
Pitch
in degrees
Roof can be defined as flat
Beam detector must be positioned in apex
