r
s
D
a
Figure 7: Minimum distance from reflective surfaces
Important information
DANGER
Hazard due to lack of effectiveness of the protective device
Reflective surfaces and dispersive media can prevent persons or parts of the body to
be protected from being properly reflected and therefore, they remain undetected.
b
Make sure that all reflective surfaces and objects maintain a minimum distance
from the light beams.
b
Make sure that no dispersive media (e.g., dust, fog, or smoke) are within the calcu‐
lated minimum distance from the light beams.
Determining minimum distance to reflective surfaces
The 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:
10
20
30
40
50
60
70
D
/m
500
1000
2000
1500
2500
3000
3500
a
/mm
131
3
Figure 8: Graph, minimum distance from reflective surfaces
Table 2: Formula for calculating the minimum distance from reflective surfaces
Distance between sender and
receiver D in m
Calculating the minimum distance from reflective sur‐
faces a 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
PROJECT PLANNING
18
O P E R A T I N G I N S T R U C T I O N S | deTem4 Core
8020453/14Q7/2020-04-27 | SICK
Subject to change without notice
