Reflectors - Siemens FDL241-9 Mounting, Commissioning

Structure and function
2

Reflectors

2.3 Reflectors
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Retro-reflectors reflect rays of light that reach them in parallel. The reflector does
not necessarily have to be installed at a right angle to the ray of light. Vibrations
and distortions on the mounting surface do not interfere with this. Interfering light is
also reflected in parallel and does not therefore reach the receiver.
The reflectors must be installed at an maximum inclination angle of 20° in all
directions.
Figure 7: Reflectors with various inclinations
1 Reflector
Reflector for long distance (prism) DLR1191
The reflector for long distance consists of a prism and a housing. The retro-
reflecting prism has the shape of an even pyramid, the lateral surfaces of which are
made up from isosceles, right-angled triangles. Light rays coming in through the
base surface are completely reflected thrice by the lateral surfaces and are than
scattered back through the base.
The reflector for long distance is fitted with a heating unit and can therefore be
used in environments with a danger of moisture condensation. The heating unit
must be connected to a 24 V supply.
Figure 8: Reflector and principle of the reflector
1 Ray of light
Reflector for middle distance (foil) DLR1192 and reflector for short
distance (foil) DLR1193
The reflectors for middle distance and for short distance consist of a film with
micro-prismatic elements, which are formed in a transparent, synthetic resin.
sealed and mounted on a plastic base. The foil basically works in the same way as
the prism.
1 1
max. 20°
max. 20°
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