Pilz PSEN op4B-S-3-080 - Manual (Page 19)

Operating Manual PSEN op4B Series
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2.2.3 Installing several adjacent safety light curtains
If it is necessary to install several safety light curtains in adjacent
areas, you will need to ensure that the emitter (TX) on one device
cannot interfere with the receiver (RX) on another. To prevent this, the
devices will need to be installed conversely or must be separated via
screening (opaque surface).
Fig. 9 gives an example of an installation that could lead to
interference, plus two correct installations.
Fig. 9