Determining minimum distance from reflective surfaces
T
he minimum distance can be determined as follows:
b
Determine the distance between sender and receiver D in meters (m).
b
Read the minimum distance a in millimeters (mm) in the graph or calculate using
the respective formula to determine the minimum distance to reflective surfaces:
500
400
300
200
100
a/mm
10 11 12 D/m1 2 3 4 5 6 7 8 9
Figure 11: Graph of minimum distance from reflective surfaces
Table 2: Formula for calculating the minimum distance from reflective surfaces
Distance (D) between sender and
r
eceiver in m
Calculation of the minimum distance (a) from reflective
surfaces in mm
D ≤ 3 m a = 131 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 12: Preventing mutual interference from system
1
and system
2
The infrared light beams of the sender of system 1 can interfere with the receiver of
system 2. This can disrupt the protective function of system 2. This would mean that
the operator is at risk.
Avoid such installation situations or take appropriate action, e.g., install optically opa‐
que partitions or reverse the direction of transmission of a system.
4 P
ROJECT PLANNING
20
O P E R A T I N G I N S T R U C T I O N S | C4-RD 8025644/19Z2/2021-03-09 | SICK
Subject to change without notice
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