RE: MS13 PIR detection through glass?

["Paul Gordon" <paul_gordon@xxxxxxxxxxx>]

On a related topic, I've had a PIR mounted externally in exactly this way
for a couple of years now... It is in fact an internal PIR model, but my
porch ceiling is very sheltered and it is completely impervious to wind
&
rain etc...

However, I've noticed of late that the sensitivity of the PIR has tailed
off
drastically.... to the point that I can walk back & forth underneath it
numerous times without being "seen"...  Sometimes I've stood
underneath it
waiving like a madman without it trigerring!

Do these things "wear out"? - anything I can do to revive it?

TIA

Paul G.




>From: "White, Peter" <peter.white@xxxxxxx>
>Reply-To: ukha_d@xxxxxxx
>To: ukha_d@xxxxxxx
>Subject: RE: [ukha_d] MS13 PIR detection through glass?
>Date: Mon, 23 Feb 2004 22:59:21 -0000
>
>Can you not mount it outside? Mine is, on the ceiling of the porch
looking
>down.  It gets relatively few false detections, whereas mounting it
facing
>outward would cause all sorts of triggers, but them my front door is
only
>about 5mtrs from the pavement, so having sensor effectively facing
inwards
>was the only workable solution for me.  A more sophisticated (i.e.
>expensive) solution would be to mount a webcam or similar covering the
>front
>door, with movement detection software.   The camera solution would
>certainly work better for aliens, as it's not dependant on the target
being
>warm-blooded.
>
>-----Original Message-----
>From: neil_goldsmith [mailto:ngoldsmi@xxxxxxx]
>Sent: 23 February 2004 21:40
>To: ukha_d@xxxxxxx
>Subject: [ukha_d] MS13 PIR detection through glass?
>
>
>I would like to detect visitors (or alians) at the front door using
>an MS13 through the front door glass .... but .... it would seem that
>the IR that is needed to trigger the PIR is blocked by the glass
>(regular not 'K' or similar) .... any thoughts or suggestions?
>
>Neil.
>
>
>
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