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Minimum distance between adjacent devices
When several AOPDs must be installed close to each other, the transmitter of one device must not interfere
hazardously with the receiver of the other device.
Interfering Passive B device must be positioned outside a minimum D
Passive A couple, see figure below.
This minimum D
distance depends on:
do
the operating distance between Passive A and Active A,
the effective aperture angle of the AOPD (EAA):
For a Type 4 AOPD, EAA
The diagram below shows the minimum distance to the interfering devices (D
of the couple Passive A – Active A for a Type 4 AOPD.
Figure 14 – Minimum distance to an adjacent device as a function of the operating distance
The formula to get D
for a Type 4 AOPD is the following:
do
D
(m) = 0.3
do
D
(m) = operating distance (m) × tan (2)
do
Warning! Please note that the Passive A can interfere with Active B in the same way as Passive B with Active A and,
if the two pairs of AOPD have different operating distances, the longest one should be used for the calculation of D
2TLC172289M0201
Rev C
2018-04-17
PASSIVE A
PASSIVE B
Figure 13 – Distance between adjacent devices
= 5° (α = ± 2.5°).
MAX
distance from the axis of the Active A –
do
ACTIVE A
ACTIVE B
) based on the operating distance (D
do
for operating distance < 3 m
for operating distance 3 m
16
)
op
.
do
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