ABB 2TLA020009R0600 Original Instructions Manual - Page 13
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Calculation of minimum distance (worst case):
x = L × tan (2 )
where
x = minimum distance between two pairs
L = distance between transmitter and receiver
= maximum spreading angle of light disturbance
NB: Example values are given in
Reflecting surfaces
The Spot units must be set up in such a way that a reflecting surface may never be allowed to redirect the light
from the transmitter into the receiver. The minimum distance to a reflective surface (horizontal or vertical) from
which the Spot pair may be mounted is calculated depending on the distance between the transmitter and receiver.
Reflective surface
Spot T
= 2.5
Calculation of minimum distance:
If the distance (L) between the transmitter and receiver is less than or equal to 3 meters (L
distance (x) is 131 mm.
If the distance (L) between transmitter and receiver is greater than 3 meters (L > 3 m) then the following formula
applies:
x = L × tan ( )
where
x = minimum distance between Spot and reflective surface
L = distance between transmitter and receiver
= maximum spreading angle of light disturbance
NB: Example values are given in
2TLC172178M0201, rev. D
2011-11-15
.
Table 2
L
.
Table 3
x
Spot R
13
Table 3
L
x
3 m
131 mm
5 m
0.22 m
10 m
0.44 m
20 m
0.87 m
35 m
1.53 m
3 m) the minimum
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