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Siemens Building Technologies
Cerberus Division
09.2000
4.8 Panes of glass
4.8.1 Penetration of panes of glass
With the reflector principle, the penetration of panes of glass is subject to certain restric-
tions.
1. Panes of glass must be absolutely smooth, clear and firmly installed.
2. Panes of glass must never be positioned at a right angle to the optical axis, in which
the pane of glass has the effect of a mirror and can reflect the beam back to the re-
ceiver (angle of incidence = angle of reflection).
3. As much as possible penetrate only one pane of glass. Maximum 2 panes of 5mm
glass may be penetrated.
4. Each pane of glass reduces the distance by 20m.
5. The detection is certain, if the signal decreases to <2 when the reflector is covered
(see section 6.3 electronic alignment).
DLO DLR
E
S
Pane of glass
Partial light scatter
Partial light scatter
DLO
DLR
E
S
Pane of glass
correct, the receiver is not affected incorrect, the receiver is affected
min. 10°
Fig. 18 With the penetration of panes of glass, check the angle in relation to the optical
axis
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