schmersal SLC 210 RF Instructions De Montage page 41

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.
POSITION
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 / light
grid is shown in the figure below.
Fog
Steam
Dust
Dense fumes
Incorrect positioning of the light curtain / light grid
Correct positioning of the light curtain / light grid
CORRECTION FACTOR Cf
Figure 2
0.25
0.50
0.50
0.25
5