Re: Correct Placement Of IR

["McGinn" <McGinn@xxxxxxxxx>]

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The PIG (TYPICAL AMERICAN GOVT PSYCHOPATH)










"The Pig" <pig@xxxxxxx> wrote in message
news:fvsxg.5003$Mz3.1062@xxxxxxxxxxxxx
>I really apprecaite it.  Thanks.
>
>
>
> "Bob Worthy" <securinc@xxxxxxxxxxxxx> wrote in message
> news:Eisxg.18381$ZH1.3000@xxxxxxxxxxxxxxxxxxxxxxxxx
>>
>> "The Pig" <pig@xxxxxxx> wrote in message
>> news:9%rxg.5001$Mz3.3722@xxxxxxxxxxxxx
>>> Wondering what the correct placement of IR sensors are.  For isntance,
>> let's
>>> say you have a room that is a perfect square, 20 by 20.  Now, the north
>> wall
>>> ahs a large window on it and the east wall has a smaller window on it.
>>>
>>> Are you suppose to face the the IR sensor in the corner of the south
>>> west
>>> wall pointed at the direction of the two windows or would you face the
>>> IR
>>> detector in the corner of the north west wall facing away.
>>
>> Actually the Northeast corner with following manufacturers specs on
>> height
>> from floor. Watch air vents, both feed and return. Don't let the motion
>> look
>> at reflective items ie mirrors, chandeliers, etc. If all this exists and
>> you
>> can't get away from it, consider audio discrimination as an alternative.
>>
>>> I guess what I'm not sure of is are you trying to sense somone entering
>> the
>>> window befroe they get all the way in the house or when they have
>>> already
>>> got int he house.
>>
>> ASAP without creating built in false alarm issues
>>
>> I'm not clear on if there are issues facing an IR sensor
>>> at a window where sunlight might be, someone passing the window on the
>>> outside might set it off, etc.
>>
>> By asking this question, you have a pretty clear picture.
>>
>>> Sorry if this is a stupid question, just now real clear on what the
>> "right"
>>> way is.
>>
>> Most standard detectors have a field of view of approx. +/- 90 degrees.
>> By
>> placing the detector in the corner, the field of view will be passing in
>> front of the windows and not looking directly at the windows. You may
>> have
>> to watch curtain movement when window is open and zone is bypassed for
>> what
>> ever reason or what air conditioning/heat circulation may do to the
>> curtains. This field of view will cover what ever the specs are on your
>> motion. Most motions would cover a 20X20 room in its entirety.
>>
>>
>
>