Re: pir false alarms

["Robert L Bass" <robertbass1@xxxxxxxxxxx>]

> See if you can figure out when ( time of the
> year) (time of the day) false alarms occured.
> If you've changed window coverings,
> sometimes the angle of the sun at certain
> times of the year can shine directly into
> motion detectors .....

That's a valid consideration in many cases.  However, with 3 separate detectors falsing, it's not very likely.  Possible, but not
likely.

> or if you've changed houshold heating system
> or moved objects that now allow hot air to flow
> past the PIR's.

Although air from the HVAC system can cause a light weight object (loose paper or one of those infamous balloons) to move,
triggering a PIR, it's not likely to have caused problems with three separate PIRs.  Also, there's a commonly held misconception
about PIRs.  Warm or cool air moving past the detectors won't trip them.  If the air is actually hitting the detector it can
sometimes trigger a false alarm.  But the detector can't "see" air moving across in front of it.

Because this system was in place for more than one year without problems and because there are problems in three separate zones, I
doubt that the HVAC system is at fault.  Given the information available, the most likely cause would be a bad panel or a bad RF
receiver (if the detectors happen to be wireless).

--

Regards,
Robert L Bass

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