schmersal SLC 410 B Instructions De Montage Et De Raccordement page 43

The recommended Cf factors are shown in the table below:
ENVIRONMENTAL CONDITION
If the device is installed in places that are subject to sudden changes in temperature,
the appropriate precautions must be taken in order to prevent the formation of
condensation on the lenses, which could have an adverse effect on monitoring.
MOUNTING
The position of the Emitter and the Receiver must prevent access to the danger zone from
above, below and from the sides, unless at least one of the optical beams has been
intercepted. Some useful information regarding the correct position of the light curtain is
shown in the figure below.
Fog
Steam
Dust
Dense fumes
Incorrect positioning of the light curtain
Correct positioning of the light curtain
Figure 2
CORRECTION FACTOR Cf
0.25
0.50
0.50
0.25
5