INSTALLATION
8
SH4 BASE-STANDARD
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.
Detection capability
The detection capability (or resolution) of the device is the minimum diameter that an
opaque object must have in order to obscure at least one of the beams that constitute
the detection zone and to actuate the sensing device.
The resolution is related to the part of the body to be protected.
As shown in the following figure the resolution only depends on the geometrical charac-
teristics of the lenses, diameter and distance between centers, and is independent of
any environmental and operating conditions of the safety light curtain.
Figure 1: Detection capability
The resolution value is obtained applying the following formula:
R = I + d
where:
I = Interaxes between two adjacent optics
d = Lens diameter
R = 14 mm Finger protection
R = 30 mm Hand protection
Operating distance
Protected height
R
opaque
object
d
I
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