compatible PIR sensor

all of them

That is nice. So the PIRs do not have any proprietary communication protocol? Just out of curiosity how do they communicate with the control unit? Any economical ones that you could recommend? It would be for indoors, small sized room and need not be pet immune.

Thanks

They use simple dry contact,open the circuit and they create an alarm close the circuit and the panel see a clear zone...

Simple detector like the bravo series from DSC,or for better performance the paradox line of detector are pretty good.. but be careful with paradox,they have special type of detector that communicate digitally with there panel,just look at the spec,most of there PIR will come in 2 flavour,the normal,compatible with al panel,and the digital one that talk only to paradox panel..

there is also the C&K line but I don't like to use time in home....the look of those are not very pleasant,in fact the wife factor is very low on those PIR but the are not very prone to falsing...

There's nothing wrong with the IS2535 IR's, you can check'em out here

... I don't have any problems with them........ You can take a peek at Optex's goodies at Regards, Russ

Almost any hardwired PIR detector ever made is compatible.

As for wireless, your system would use Ademco '5800 series' wireless devices.