4.3.2.2
Taking reach over into account
In accordance with ISO 13855, it must not be possible to defeat the ESPE. If access to
the hazardous area by reaching over a protective field cannot be prevented, the height
of the protective field and minimum distance of the ESPE must be determined. This is
done by comparing the calculated values based on the possible detection of limbs or
body parts with the values resulting from reaching over the protective field. The greater
value resulting from this comparison must be used.
Figure 9: Representation of the accessibility of ESPE by reaching over. Left: Protective field that
cannot be reached over. Right: Protective field that can be reached over.
4.3.3
Minimum distance to reflective surfaces
Overview
The light beams from the sender may be deflected by reflective surfaces and dispersive
media. This may prevent an object from being detected.
Therefore, all reflective surfaces and objects (e.g. material bins, machine table, etc.)
must maintain a minimum distance (a) from the protective field. This minimum dis‐
tance (a) must be maintained on all sides of the protective field. This applies in
horizontal, vertical and diagonal directions as well as at the end of the safety light
curtain. The same area must be free of dispersive media (e.g., dust, fog, or smoke).
The minimum distance (a) depends on the distance (D) between sender and receiver
(protective field width).
The weld spark guard can influence the optical properties of the safety light curtain,
meaning that reflective surfaces have to observe a larger minimum distance.
r
s
D
a
Figure 10: Minimum distance from reflective surfaces
PROJECT PLANNING
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8014276/1DCM/2022-10-27 | SICK
O P E R A T I N G I N S T R U C T I O N S | deTec2 Core
19
Subject to change without notice
