Abus AZBW20000 Mode D'emploi page 22

Fig. 8
If you attach the detector so that adjoining sites are also included in the monitored area,
turn the module and mask the beams horizontally or vertically, which fall outside the area
to be monitored. To do this, use the stickers supplied on the smooth back of the lens. See
the diagram below on the next page. When exchanging the lens, always make sure it is in
the correct position to maintain the required area of detection (top of the Fresnel lens is
marked with TOP). See Fig. 9.