Operating Instructions
Chapter
4
miniTwin2
8013482/YT85/2016-02-23
© SICK AG • Industrial Safety Systems • Germany • All rights reserved
25
Subject to change without notice
Mounting
4.1.2
Minimum distance to reflective surfaces
The light beams from the safety light curtain may be deflected by reflective surfaces. This
can result in failure to identify an object.
All reflective surfaces and objects (e.g. material bins) must therefore be located at a
minimum distance
a
from the protective field of the system. The minimum distance
a
depends on the distance
D
between the Twin Sticks.
The field of view of the sender and receiver optics is identical.
How to determine the minimum distance from reflective surfaces:
Determine the distance
D
[m] between the Twin Sticks.
Up to a protective field width of 3 m, the minimum distance is at least 262 mm.
For a protective field width of more than 3 m, read the minimum distance
a
[mm] from
the graph:
Or:
Calculate the minimum distance for a protective field width of more than 3 m using the
formula
a
[mm] = tan 5° ×
D
[m] × 1000
Example:
a
= tan 5° × 4 m × 1000
a
= 349.95 mm ~ 350 mm
Fig. 11: Minimum distance to
reflective surfaces
Note
Fig. 12: Graph, minimum
distance from reflective
surfaces
Reflective surface
Minimum distance a
Distance D
Field of view
Distance D [m]
M
in
im
um
di
st
an
ce
a
[m
m
]
