Re: PIRs for house with ceiling heating & cooling vents and "pets"!

["Roland Moore" <nospam@xxxxxxxxxx>]

>DSC encore PIRs

DSC makes okay low end panels. Their PIRs may be another thing entirely.
Inexpensive may be their only claim to fame. Try a Bosch TriTech for pet
immune motion detectors.
http://fe0wap86.bosch.de/intershoproot/eCS/Store/all/ST_NA/lit1/DS825AndDS840Se_DataSheet_enUS_F1848416267.pdf

Pet and Animal Immunity
The detector is able to distinguish between signals caused
by humans and signals caused by pets (one dog up to 27 kg
[100 lb], up to 10 cats, and other small animals such as
birds and rodents). This provides immunity to false alarms
while maintaining proper catch performance of human
targets.

"eddy" <eddyweddy@xxxxxxxxx> wrote in message
news:1193229540.596244.301930@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I recently had an alarm system installed, consisting of a NX-16 panel,
> magnetic reeds on all doors and DSC encore PIRs in the main living
> areas. The PIRs, according to the installer are immune to small pets.
> In my case the pets consist of one 12kg Cavalier King charles spaniel
> who spends all his time sleeping and a 8kg, 15 year old cat who sleeps
> even more! Then there are the 2 Roomba discovery automatic vacuum
> cleaners, dinner plate size gadgets who run around the house at
> regular intervals sucking up debris.
>
> However, it was not this collection of pets who appear to have caused
> the problem. I also have heating and cooling ducts in the ceiling
> because the house is all on one level and built on a concrete slab. At
> the moment, because it's still early spring here, the heating
> occasionally comes on at 6.30pm. Because I sometimes get home only
> after 7.30pm, the heating has been running for around an hour. Over
> the last 8 weeks, practically every PIR in the house has falsed at
> least once after 6.30pm. Some of the heating ducts are within 3 ft of
> the PIR.
>
> To be absolutely sure, I have actually "banished" the pets from the
> house, but the false alarms still continue.
>
> To make matters worse, even if I did disable the timers that operate
> the thermostat, my heating unit is a ceiling mounted model which has a
> fan controller that is triggered by the ambient temperature inside the
> unit. In days that are hot enough, the heat in the roof is actually
> high enough to trick the fans into coming on, which in turns causes
> warm air to circulate into the house. And this has caused at least one
> false alarm ...
>
> In a situation like mine, are there PIRs which are capable of handling
> the disturbance from the heating ducts, or is the only option to have
> the PIRs removed from the security system ?
>
> rgds, Ed
>