9
Single beam protection.
If the risk analysis permits the use of a single beam to detect the presence of a person
intercepting the beam with his/her body as he/she approaches the hazardous area in a
standing position (fig. 3), determine the minimum safety distance with the aid of the
following formula:
S = 1600(tb + tu + t1) + 1200
In this case we recommend arranging the equipment so that the beam will run parallel to the
reference plane, G, at a height H=750mm (fig. 3).
When using a single beam system, it is necessary to examine closely the risk of people
intruding into the hazardous area without intercepting the beam.
Figure
Figure 3
3
Figure
Figure 4
4
Double beam protection.
When using two ULISSE UNC photocells one on top of the other so that the beams are
arranged one on top of the other, it becomes possible to set up a double beam
protective system.
In these conditions, the minimum safety distance must be determined through the following
formula:
S = 1600(tb + tu + t1) + 850
The distances, H, of the beams from the reference plane G, are 400mm and 900mm,
respectively (fig. 4).
