Type 4 Safety Light Curtain
29
α > 30°
α < 30°
Calculation based on
Vertical approach
Horizontal approach
Safety clearance refers to
Distance between the point of danger and
the closest light beam
Distance between the point
of danger and the furthest
light beam
Note
The height of the furthest
light beam may not be
≤
1000 mm.
The following applies to the
closest light beam:
H = 15 ×(d – 50 mm) and
d = H/15 + 50 mm
5.5 Clearance from Reflective Surfaces
NOTE!
• Reflective surfaces located within the aperture angle between the emitter and the receiver
may counteract the system’s safety function.
• Minimum clearance (m) from reflective surfaces to the optical axis must be adhered to.
IEC 61496-2
m = tan
α
× safety field width
m
α
α
!
Danger Zone
Reflective
Object
Emitter
Receiver
