Omron F3SG-SRB Series User Manual page 303

Wiring and Installation
The detection surfaces of the emitter and receiver are not in parallel to each other.
Mount the F3SG-SR on a flat surface. Mounting it on an inclined surface cause the orientation of the
beams to tilt with respect to the floor, resulting in misalignment of the beams of the emitter and
receiver. Mount the emitter and receiver on a level surface by checking the lean by a level.
Mounted on a level, flat surface. Mounted on an inclined, uneven surface.
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F3SG-SR
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User's Manual