Re: Dual Tech motion detectors with dual relay outputs ?

[Jim <alarminex@xxxxxxx>]

On Aug 19, 2:52?pm, Marc_F_Hult <MFH...@xxxxxxxxxxxxxxxxxxxxx> wrote:
> I'm looking for PIR + microwave (dual tech) motion detectors that separate
> have outputs for both the PIR and microwave detectors. It would be OK for
> the microwave not to be energized until after the PIR detects motion (in
> other words, the two outputs could be PIR and (PIR+uWave) rather than PIR
> and uWave).
>
> My application is for using the same device for both lighting path
> automation (which needs to be fast but which for false detections are not a
> major problem) and intrusion security (for which immunity from false
> detection is important).
>
> The closest I've found are some Rokonet iWISE detectors
>
> http://www.riscogroup.com/Products.aspx?subcatid=152&id=12
>
> that have "Green Line for disabling the MW when the building is occupied"
> and  separate LEDs for walk-testing that might allow me to solder on
> comparators to close relays when the LEDs light. I'd prefer something
> pre-built though.  Two separate NO or NC relays would be ideal.
>
> Any suggestions ?
>
> TIA ... Marc
> Marc_F_Hultwww.ECOntrol.org

I didn't read all the replies in this thread so you may have been
already advised of the following.

Sentrol makes dual tech motion detectors that you can shut off the PIR
or the Microwave detection. If you had to and you set one with PIR
detection and one with Microwave detection, would that solve your
problem?

Also .... I don't know how much you know about the difference between
PIR detectors and Microwave detectors.

You're project sounds as if timing is an important factor but I don't
know how exact you're planing on needing.

Just in case, ..... I think that where you mount the detectors, in the
path of movement will be a most significant factor, as PIR detectors
are most sensitive with cross motion, while microwave detectors are
most sensitive to toward and away motion. Also, the moving object that
you want to detect will have some impact on the sensitivity of the
detectors. Lots of metal or RF reflective items will cause a microwave
device to detect quicker than soft plyable material. Heat sources or
material that is highly reflective of infrared light will cause a PIR
to detect quicker than will cooler  or IR absorbent material. Also ...
with PIR's, the ambient temperature and lighting can either enhance or
inhibit the sensitivity also.

You may find that the inherent variables of the detectors is too wide
a spectrum.