OPD101
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5.2.4 Avoidance of multiple reflections
2
3
1
Fig. 6: multiple reflections
1:
sensor
2:
object
3:
multiple reflections
u
Slightly change the sensor position – e.g. incline the sensor laterally or frontally, increase /
decrease the distance to the object.
5.2.5 Avoidance of soiling and ambient light
Preferably align photoelectric sensors with the front lens facing downwards or parallel to the earth’s
surface.
Background:
•
Photoelectric sensors are sensitive to direct radiation of light sources. Everyday light sources
(lamps, sun) radiate from above.
•
Photoelectric sensors react sensitively to soiling, as it reduces the excess gain.
Dust deposits can be reduced by downwards or sideways orientation. This allows for longer
cleaning intervals.
Make sure that sensors installed with their front lens facing upwards are not oriented towards
roof windows or ceiling lamps.
