Where unexplained false alarms are occurring on specific PIRs, radio frequency interference (RFI) from local radio stations, taxis and emergency vehicles is probably causing the problem. Changing the PIR does not work as the cable length and route can act as an aerial that will attract the RFI signals. The quick solution is to fit an ACT 1376 PIR stabiliser as standard inside (or behind) the troublesome detector which will stabilise the DC supply.

• Powers a PIR or dual detector for up to 250ms in the event of a DC spike
• Eliminates replacing non-defective motion sensors