HCO SG560C - Manual (Page 23)

HCO ScoutGuard SG560C Appendix I: PIR Detection Zone
Page 20
Appendix I: PIR Detection Zone
The figure4 shows the detection range in different detection
angle. When the detection angle is 35°,the detection range is 50ft.
When the detection angle is 52°,the detection range is 30ft.
Figure 4
The PIR detection angle (α) is just barely larger than the field
of view angle(β). The advantage of this design is to avoid empty
pictures and get available pictures.
Figure 5