Re: PIR's: Why trip on two detects?

["Jim" <alarminex@xxxxxxx>]

Nomen Nescio wrote:
> Frank Olson said:
>
> >Some dual tech's allow you to select "either" or "both" technologies to
> >generate an alarm condition that will trip the relay.
>
> Offhand, I can't think of any dual tech that can be set to trip on either
> PIR or MW, rather than both.  Which one are you thinking of?

The Sentrol AR 435 for one and I think some of the Visonic dual tec's
also.

I've got one application in a big mansion where the owner doesn't want
to have detectors seen is some areas. At the top of his main stairway
there's a very expensive painting. I have an AR435 in an adjacent area
set at microwave only, looking through the wall at the area on the
stair landing.