Pilz PSEN op4H-s-30-150/1 - Manual (Page 19)

Instruction Manual PSEN op4F/H-s Series
15
2.2.2. Minimum distance from reflecting surfaces
Reflecting surfaces placed near the light beams of the safety device
(over, under or laterally) can cause passive reflections. These
reflections can affect the recognition of an object inside the controlled
area.
However, if the RX receiver detects a secondary beam (reflected by
the side-reflecting surface) the object might not be detected, even if
the object interrupts the main beam.
Fig. 7