Conrad FS20 IRP Bedienungsanleitung Seite 44

Radio motion detector "FS20 PIRI"
The photo diode is soldered directly on the resistor R10 (cathode of the IR diode) and the
capacitor C9 (anode of the IR diode) as shown in the illustration once you have opened the
housing and removed the circuit board.
If you do not want to drill an opening into the housing, you can also program the motion detector
after insertion of the battery in dissembled state. Otherwise drill a boring on the side of the
casing or the rear cover opposite of the photo diode and protect this against dust penetration
with transparent adhesive tape.
44