Datalogic Laser Sentinel, Instruction Manual, Page: 31 / 152

PRECAUTIONS FOR ENVIRONMENTAL INTERFERENCE
INSTRUCTION MANUAL
13
High Reflecting Background
If there is a high reflecting background within 3 meters of the safety zone boundary, e.g.
a metallic glossy surface, the Laser Sentinel might fail to recognize the exact distance of
the detected object because of an increase in the measure error.
In this circumstance, it is recommended to reduce or remove the reflecting background.
In cases where this cannot be avoided, an additional distance must be applied to the
minimum safety distance calculation. This distance depends on the Dust Filter Level and
on the background characteristics. Typically, an additional distance of 200 mm is enough
to prevent any reduction in the detection capability.
NOTE
NOTE
Figure 2 - High Reflective Background
This additional distance based on the highly reflecting background influ-
ence range of 3 meters is relative to a reflective background test target of
300 cd m
-2
lx
-1
. For higher values of background reflectance, further risk
analysis must be done to evaluate the effective influence range and even-
tually to increase the additional distance.
The presence of dirt spots, damage or scratches to the optical window may
have an impact on additional distance evaluation and potentially may
reduce the detection capability. Perform window cleaning according to
"
Window Cleaning" on page 101
.
In case of both light interference and high reflecting background, additional
distances are not summed, but the highest distance should be used.