IDEC SG4 Type 4 Finger & Hand - Manual (Page 20)

SG4-B Series Instruction Manual
16
It is thus important to position the safety light curtain according to the
minimum distance from reflecting surfaces.
The minimum distance depends on:
 operating distance between emitter (TX) and receiver (RX);
 real aperture angle of ESPE (EAA); especially:
for ESPE type 4 EAA = 5° (α = ± 2,5°)
Diagram of Fig. 8 shows the minimum distance from the reflecting
surface (Dsr), based on the operating distance:
Fig. 8
The formula to get Dsr is the following:
Dsr (m) = 0.15 for oper.distance < di 3 m
Dsr (m) = 0.5 x operating distance (m) x tg 2  for oper.distance  di 3 m
ESPE
Type 4