GENERAL INFORMATION ON DEVICE POSITIONING
PRODUCT REFERENCE GUIDE
17
Distance between homologous devices
The following graphic shows the distance from the interfering devices (Ddo) according
to the operating distance (Dop) 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 11: Distance between homologous devices
This minimum Ddo distance depends on:
• the operating distance between emitter (TXA) and receiver (RXA)
• the effective aperture angle of the ESPE (EAA)
Figure 12 - ESPE Type 4
The formula to get Ddo is the following:
Ddo (mm) = 263 for operating distance < 3 m
Ddo (m) = operating distance (m) x tg 5° for operating distance ≥ 3 m
CAUTION: The interfering device (TBX) must be positioned at the same Ddo
distance, calculated as shown above, even if closer to TXA respect to RXA.
Installation precautions have to be taken to avoid interference between
homologous devices. A typical situation is represented by the installation
areas of several adjacent safety devices aligned one next to the other, for
example in plants with different machines.
mm
m
0.2
3
10
20
Operating distance (D
op
)
Homologous distance device (D
do
)
263
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