I have mine wired up to a PIR inside the doors of my grain store & it just needed a bit of time to adjust the sensitivity & angle of sight so it didn't go off as the sun went into cloud cover & back into clear skies, the doors are south facing. Now I very very rarely get false alarms. They are very loud & distinctive & I can hear it from outside the farm house which is 1/2 mile as the crow flies away from the grain store. It turns itself off after a minute or so if there is nothing to reactivate it again.
Get a decent basic alarm system such as a Honeywell Galaxy Flex system - preferably with a GSM card so you get a text message if the alarm triggers.
Use decent quality dual tech PIR units that have both PIR & microwave detectors as these are far less prone to false triggering. If you want door contacts then buy good quality ones, otherwise you will get no end of false alarms.
I have wired in a secret switch which cuts the power from the 2 PIRs to the Siren, so PIRs are set to activate at all times but I can turn the noise off or on when I want to. Equally you could put a timer in the circuit
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