Distance between active and pas‐
sive units (D) in m
Calculating the minimum distance from reflective sur‐
faces a in mm
D > 3 m
a = tan (2.5°) × 1,000 mm/m × D = 43.66 × 1 mm/m ×
D
4.3.4
Protection against interference from systems in close proximity to each other
Overview
!
"
Figure 11: Upset condition 1: Preventing mutual interference from system
!
and system
"
Upset condition 1: The infrared light beams of the active unit of system
!
can be
reflected by the passive unit of system
"
and received by the active unit of system
"
.
This can disrupt the protective function of the systems. This would mean that the opera‐
tor is at risk.
!
"
Figure 12: Upset condition 2: Preventing mutual interference from system
!
and system
"
Upset condition 2: The infrared light beams of the active units of systems
!
and
"
can
cause mutual interference. This can disrupt the protective function of the systems. This
would mean that the operator is at risk.
Important information
DANGER
Hazard due to lack of effectiveness of the protective device
Systems of multiple light beam safety devices in close proximity to each other can
mutually interfere with each other.
b
Use suitable measures to prevent interference between systems in close proximity
to each other.
PROJECT PLANNING
4
8024802/2020-07-17 | SICK
O P E R A T I N G I N S T R U C T I O N S | deTem4 LT Muting A/P
23
Subject to change without notice