SICK LE20 Instrucciones De Operación página 293

Operating Instructions
LE 20
8 008 685/Q913/2007-05-21
Safety notes
thus non-detection of an object or a person. Therefore, all
reflective surfaces and objects (e.g. material containers)
must keep a minimum distance a (rotationally symmetrical)
about the optical axis between sender and receiver (see
Fig. 2-3 and Fig. 2-4).
Fig. 2-3: Minimum distance a to reflective surfaces, correct installation and
alignment
S = sender R = receiver
a Limit to the danger zone
d Direction of entry to the hazardous zone f optical axis
a = Minimum distance to reflective surface
Fig. 2-4: Minimum distance a depending on distance D for testable single-
beam photoelectric safety switches
How to calculate the minimum distance a to reflective surfaces
for single-beam photoelectric safety switches with an aperture
angle of 10°:
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D = sender-receiver distance
s reflective surface
GB
Chapter 2
2 9 3