Re: pir false alarms

["Jim" <alarminex@xxxxxxx>]

joble_5@xxxxxxxxxxx wrote:
> Hi,
>
> we have an alarm for 2,5 years now. It is a Rokonet system. The PIR
> detector's used are Pyronix Magnum Ultra.
>
> It worked fine for more than 2 years, but last summer we had false
> alarms almost once per week. Always on the same sensor. Sensor was
> replaced by the installer, but next night there was again a false
> alarm.
>
> The Pir is now replaced by a dual detector, and this detector seems to
> work well.
>
> The next week we had false alarms with both the two other PIR's. So
> they are also replaces by dual's.
>
> Now it has worked fine for 3 months. But the installer sends us a bill
> for the replacement of the first detector. And i think another bill for
> the two others will follow. Together this is the 25% of the price of
> the system! I do not think this is normal after 2,5 years. (The
> warranty of the system is 1 year, but on the pyronix site i read the
> pir detectors come with 5 years of warranty)
>
>
> I want to argue with the installer but first i want to learn more about
> the problem. So i have some questions:
>
> Is it possible that a fly triggers the pir?
> Can this problem be due to bad adjustment of the pir or the use of the
> wrong lenses?
> Can the reason be in the rokonet system instead of in the PIR's?
> Any other ideas???
>
>
> Thanks in advance...

A couple of things that haven't been mentioned yet.

Strong radio frequency signals can sometime cause sensors to trip. Do
you have any RF souces in your home or do some neighbors?  Taxi cabs,
police cars etc can sometimes cause problems.

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 ..... reflect off of objects in a room ..... heat up
glass which can rapidly cool ....... or if you've changed houshold
heating system or moved objects that now allow hot air to flow past the
PIR's.

Obviously, dual technology sensors will help reduce these things from
affecting sensors.


> Joble