Pilz PSEN op4B-S-3-080 - Manual (Page 17)

Operating Manual PSEN op4B Series
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2.2.2 Minimum distance from reflective surfaces
Reflective surfaces close to the light beams emitted from the safety
device (whether above, below or to the side), may cause passive
reflections and adversely affect detection of the object within the
protected field (Fig. 7).
Fig. 7
Improper installation could mean that a protected field is interrupted
without detection, resulting in serious injury.