EN
12
Instructions for Use and Safety Precautions
The number of utilized beams is based upon the EN ISO 13855 standard in consideration of the relevant
level C standard.
The minimum and maximum heights specified in the table may not be exceeded or fallen short of respectively.
Beam heights for securing areas in accordance with EN ISO 13855:
Number of Beams
Beam Clearance in mm
Height Above Reference Level in mm
4
300 mm
300, 600, 900, 1200
3
400 mm
300, 700, 1100
2
500 mm
400, 900
Example:
Selected parameters: safety device with 300 mm beam clearance and 4 beams, vertical installation
Assuming
machine over-travel time
t2 = 20 ms
Safety Light Array response time SB4-30IE090C1
t1 = 10 ms
Approach speed
K = 1600 mm/s
Safety clearance
Safety clearance S
= K × T + C
= K × (t1 + t2) + C
= 1600 mm/s × (0,01 s + 0,02 s) + 850 mm
= 898 mm
3.4 Minimum Clearance to Reflective Surfaces
If reflective surfaces are located within the aperture angle between the transmitter and the receiver, reflection may
result which could cause an obstruction to go undetected. For this reason, a minimum clearance
m
between
reflective objects and the optical axis must be maintained.
Beam angles are taken from the IEC 61496-2 standard. They represent worst case values. Actual values are lower.
m
α
α
Danger Zone
Center Beam
Emitter
Receiver
Reflective
Object
Light Bundle
interrupted
m = tan
a
× (Distance Transmitter – Receiver)
2
4
6
8
10
12
14
16
18
20
0,10
0,20
0,30
0,40
0,50
0,60
0,70
0,80
0,90
0,131
Minimum Clearance m in m
Range in m
a = Opening Angle of Emitter and Receiver Optic
a = ±2,5°
