SICK WEU26-3 User Manual

Operating Instructions Chapter 4
WSU/WEU263
8013338/YTA4/2016-03-24 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 17
Subject to change without notice
Mounting
4.1.2 Minimum distance to reflective surfaces
The light beams from the sender may be deflected by reflective surfaces. This can result in
failure to identify the object.
Therefore all reflective surfaces and objects (e.g. material bins) must be a minimum
distance a from the light path between sender and receiver of the WSU/WEU26@3 devices.
The minimum distance a depends on the distance D between sender and receiver.
Sender and receiver optics have the same field of view.
The minimum distances to reflective surfaces only apply when the light path is clear. On
the usage of transparent guard windows, these values may change.
D [m]
a [mm]
131
3
Distance D [m] sender – receiver Calculation of the minimum distance a
from reflective surfaces
D Q 3 m a [mm] = 131
D > 3 m a [mm] = tan (2.5°) x 1,000 x D [m] = 43.66 x D [m]
Fig.
6
:
Minimum distance to
reflective surfaces
Note

WARNING
Fig.
7
:
Graph, minimum
distance from reflective
surfaces
Tab.
6
:
Formula for the
calculation of the minimum
distance to reflective
surfaces
Reflective surface
Field of view
Minimum
distance a
Distance D sender
–
receiver

SICK WEU26-3 Specifications

General

Brand	SICK
Model	WEU26-3
Category	Security Sensors
Language	English