Figure 11: Representation of the accessibility of ESPE by reaching over. Left: Protective field that
c
annot be reached over. Right: Protective field that can be reached over.
4.3.3 Minimum distance to reflective surfaces
Overview
T
he 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.
Figure 12: Minimum distance from reflective surfaces
Important information
DANGER
H
azard due to lack of effectiveness of the protective device
Reflective surfaces and dispersive media can prevent persons or parts of the body to
be protected from being properly reflected and, therefore, remain undetected.
b
Make sure that all reflective surfaces and objects maintain a minimum distance
from the protective field.
b
Make sure that no dispersive media (e.g., dust, fog, or smoke) are within the
calculated minimum distance from the protective field.
4 P
ROJECT PLANNING
26
O P E R A T I N G I N S T R U C T I O N S | deTec4 8027140/2021-11-04 | SICK
Subject to change without notice
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