Instruction Manual
SG2 EXTENDED
3
1.3. How to choose the device
There are at least three different main characteristics that should be considered when choosing a
safety light curtain, after having evaluated the risk assessment:
1.3.1.
Resolution
The resolution of the device is the minimum dimension that an opaque object must have in order to
obscure at least one of the beams that constitute the sensitive area.
The resolution strictly depends on the part of the body to be protected.
R = 30 mm
hand protection
Type 2
R = 50 mm
R = 90 mm
presence control
As shown in Fig.1, the resolution depends only on the geometrical characteristics of the lenses,
diameter and distance between centres, and is independent from any environmental and operating
conditions of the safety light curtain.
Fig. 1
The resolution value is obtained applying the following formula:
R = I + d
where:
I
= Distance between two adjacent optics
d = Lens
diameter
