4 8540573 • 16/09/2016 • Rev.20
PRINCIPLE OF OPERATION
LIGHT CURTAIN
If the area guarded is clear, the two outputs on the Receiver are active and permit normal
functioning of the machine connected to these.
When an object larger than or equal to the resolution of the system interrupts the sensing field of
one or more beams, the Receiver de-activates its outputs.
This condition makes it possible to block the dangerous movement of the machine (using a
suitable machine stop circuit).
Resolution is the smallest diameter object that will be reliably detected by at least one of the
optical beams generated by the light curtain (Figure 1).
Figure 1- Light curtain resolution
Resolution is constant regardless of working conditions as it depends only on the geometrical
characteristics of the lenses and the center distance between two adjacent lenses. The height of
the guarded area is the height effectively protected by the safety light curtain.
If the curtain is positioned horizontally, this value indicates the depth of the guarded zone. The
useful range is the maximum operating distance that can exist between the Emitter and Receiver.
JANUS is available with the following resolutions (MODEL "MI") :
30mm (protected heights from 300mm to 1200mm) ("MI" models):
PROTECTION OF THE HANDS.
40mm (protected heights from 300mm to 1800mm) (“MI”, "MILR" and “JLR” models):
PROTECTION OF THE HANDS.
90mm (protected heights from 300mm to 1800mm) ("MI" models):
PROTECTION OF THE LIMBS.
JANUS is also available in a Multibeam version ("MI", "MT" and "ML" models) with a pitch
between the lenses of:
500mm (2 beams), 400mm (3 beams), 300mm (4 beams only models "MI"), "MILR"
”J” and “JLR”. PROTECTION OF THE BODY.
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