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SG BODY REFLECTOR MUTING
3.2.3 Distance between homologous devices
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.
Passive B interfering device must be positioned outside a minimum D
axis of the device A.
This minimum D
distance depends on:
do
•
the operating distance between Passive A and Active A;
•
the effective aperture angle of the ESPE (EAA); especially:
•
for ESPE type 4
The interfering device Passive B must be positioned at the same D
calculated as shown above, even if closer to Passive A respect to Active A.
The following graphic shows the distance from the interfering devices (D
) of the couple Passive A – Active A for a Type 4 ESPE.
distance (D
op
The formula to get D
op
D
(m) = 0.3
for operating distance < 3 m
op
D
(m) = operating distance (m) x tg 2
op
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.
PASSIVE A
PASSIVE B
EAA
= 5° (α = ± 2.5°)
MAX
m
0.7
0.6
0.3
0.5
3
for a Type 4 ESPE is the following:
Figure 17
ESPE Type 4
6.5
Operating distance (D
op
Figure 18
for operating distance 3 m
17
distance from the active – passive
do
ACTIVE A
ACTIVE B
) according to the operating
do
m
8
)
distance,
do
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