Datalogic SG4 FIELDBUS Series, Instruction Manual, Page: 24 / 136

INSTALLATION
14 SG4 EXTENDED
It is important to position the safety light curtain according to the minimum distance
from reflecting surfaces.
The minimum distance depends on:
• operating distance between emitter (TX) and receiver (RX);
• real aperture angle of ESPE (EAA); especially:
for ESPE Type 4 EAA = 5° ( α = ± 2.5°)
Figure 6 - Minimum distance from reflective surface
The formula to get Dsr is the following:
For ESPE Type 4:
Dsr (m) = 0.13 for operating distance < 3 m
Dsr (m) = 0.5 x operating distance (m) x tg 2° for operating distance ≥ 3 m
Distance between homologous devices
The following graphic shows the distance from the interfering devices (Ddo) according
to the operating distance (Ddo) of the couple (TXA – RXA).
If different safety devices have to be installed in adjacent areas, the emitter of one
device must not interfere dangerously with the receiver of the other device.
The TXB interfering device must be positioned outside a minimum Ddo distance from
the TXA – RXA emitter-receiver couple axis.
Figure 7 - Distance between homologous devices