16
Protection range L
Permitted distance A
0.3 to 3m
0.16m
>3m
L × tan2.5°=L×0.052
Figure 4-4 The placement position schematic drawing of prevented the
influence from the reflecting surface around the light curtain
Emitter
Receiver
2.5
。
2.5
。
2.5
。
2.5
。
α
Working distance L
4.4 Reflecting Surface Influence around the Light Curtain
The cone has a aperture Angle alpha, it
formed between the optical axis and a light
beam on the edge of the cone.
Alpha = aperture Angle of the light beam
L = the distance between the emitter and
receiver
A. The smooth reflecting surface around the light curtain, can cause the protector to lose the
normal function, so as to lose the protective function.
B. The placement position of the protector, must be as far as possible away the reflecting
object, or cover up the reflecting object, eliminates the disturbance around the light
curtain, guarantee the security.
If it has the smooth reflecting surface around the light curtain, like the metal plate, the floor, the
ceiling, the work piece, the cover, the partition board, the glass plate and so on, the protector
placement position must be apart from the reflecting surface farther than value A (m), value A can be
calculated by the formula in form, or be consulted from the coordinates chart.
