HCO SG580MB Manual - Manual (Page 34)

HCO ScoutGuard SG580MB Appendix I: PIR Detection Zone
Page 31
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.