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INSTALLATION
Minimum distance from reflecting surface (D
Reflecting surfaces placed near the light beams of the safety device (over, under or lat-
erally) can cause passive reflections. These reflections can affect the recognition of an
object inside the controlled area. Moreover, if the RX receiver detects a secondary beam
(reflected by the side-reflecting surface) the object might not be detected, even if the
object interrupts the main beam.
It is important to position the safety light curtain according to the minimum distance
from reflecting surfaces.
The minimum distance depends on:
•
•
for ESPE Type 4 EAA = ±2.5°
In the diagrams shows the minimum distance from the reflecting surface (D
on the operating distance:
The formula to get D
D
(m) = 0.13
SR
D
(m) = operating distance (m) x tan (2.5°)
SR
16
SH4 ADVANCED
TX
reflecting surface
TX
Figure 10: Distances from reflective surfaces
operating distance between emitter (TX) and receiver (RX);
real aperture angle of ESPE (EAA); especially:
m
0.87
0.44
0.13
0.2
Figure 11: Minimum distance from reflective surface
is the following:
SR
SR
DANGEROUS ZONE
α
D
SR
α
reflecting surface
3
10
Operating distance (D
)
OP
)
RX
α
RX
20
m
for operating distance < 3 m
for operating distance ≥ 3 m
), based
SR
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