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Subject Author Date
Newbie questions seafh 05-07-2006
---> Re: Newbie questions Stanley Barthfa...05-08-2006
Posted by on May 7, 2006, 11:39 pm
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Hi,

I am thinking of installing a burglar alarm system in my home and
have a few questions after I looked at product descriptions of some
available systems online:

(1) Is it really worthwhile to order the monitoring service together
with the security system? I mean, most really depend on phone line to
call up the monitoring company for the alarm. Aren't most burglars
smart enough to cut the phone line before they enter the house? There
are some that provide cell phone dial up, but I wonder if that's really
worth the trouble.

(2) Without the monitoring service, how effective is the alarm siren.
Isn't it relatively easy for the burglar to take the battery out of the
controller and the siren will stop shortly?

Thanks in advance.


Posted by Rich on May 8, 2006, 7:01 am
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If you have this outlook why are you installing a system anyway? There must
be a reason you are spending $500.00. Safety, Security, Early warning, Evan
a door chime so you know when the wife left the dog out.

Oh the insurance discounts. Maybe the smoke detector that went off at 3 AM
and called the fire dept while you were sleeping. It's worth it to have it
monitored because you have no clue.




Posted by on May 8, 2006, 8:27 am
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Rich wrote:
> If you have this outlook why are you installing a system anyway? There must
> be a reason you are spending $500.00. Safety, Security, Early warning, Evan
> a door chime so you know when the wife left the dog out.
>
> Oh the insurance discounts. Maybe the smoke detector that went off at 3 AM
> and called the fire dept while you were sleeping. It's worth it to have it
> monitored because you have no clue.

Thanks for the response. However, I am not sure I understand you. I
am concerned about the effectiveness of the burglar alarms from what I
read, so I raised the questions. May be most burglars don't cut phone
lines before they entered houses? May be many systems have a built-in
battery that will power the siren and not easily taken on etc.
Actually, I am not planing to spend $500, more like $200-$300 for one
of those wireless system from online site. I am not going to count on
window/door sensors, but rather on motion detector for protection while
nobody is home (the main situation for protection).
Actually, I have one more question regarding those motion detector:

(3) Those pet immune motion detectors: are these thermal based detector
such that they only detect living things with thermal radiation, such
that the motion of a non-living object won't trigger them (such as a
curtain blown by wind thru a window etc.)?

Thanks again.


Posted by Stanley Barthfarkle on May 8, 2006, 8:57 am
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> Actually, I am not planing to spend $500, more like $200-$300 for one
> of those wireless system from online site. I am not going to count on
> window/door sensors, but rather on motion detector for protection while
> nobody is home (the main situation for protection).

Need 2 levels of protection for an effective system- perimeter
(doors/windows) and interior. (motions, tampered drawers or cabinets, etc)
There is a significant advantage to catching a burglar BEFORE or WHILE he's
breaking in, instead of after he's already in. Layers of protection increase
your level of protection, and provide a form of "verification", since an
intruder moving through a premises will trip mutiple zones of protection.


> (3) Those pet immune motion detectors: are these thermal based detector
> such that they only detect living things with thermal radiation, such
> that the motion of a non-living object won't trigger them (such as a
> curtain blown by wind thru a window etc.)?

Some are Passive Infrared, some are both PIR and Microwave. Motion of
anything will trip a detector, since curtains or other objects do not have
precisely the same Infrared light (heat) signature as background objects. A
blowing curtain, helium balloons, and many other things will trip a motion
detector. Proper engineering and setup is vital to false alarm elimination
and proper catch performance.





Posted by Bob La Londe on May 8, 2006, 9:15 am
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>> Actually, I am not planing to spend $500, more like $200-$300 for one
>> of those wireless system from online site. I am not going to count on
>> window/door sensors, but rather on motion detector for protection while
>> nobody is home (the main situation for protection).
>
> Need 2 levels of protection for an effective system- perimeter
> (doors/windows) and interior. (motions, tampered drawers or cabinets, etc)
> There is a significant advantage to catching a burglar BEFORE or WHILE
> he's breaking in, instead of after he's already in. Layers of protection
> increase your level of protection, and provide a form of "verification",
> since an intruder moving through a premises will trip mutiple zones of
> protection.
>
>
>> (3) Those pet immune motion detectors: are these thermal based detector
>> such that they only detect living things with thermal radiation, such
>> that the motion of a non-living object won't trigger them (such as a
>> curtain blown by wind thru a window etc.)?
>
> Some are Passive Infrared, some are both PIR and Microwave. Motion of
> anything will trip a detector, since curtains or other objects do not have
> precisely the same Infrared light (heat) signature as background objects.
> A blowing curtain, helium balloons, and many other things will trip a
> motion detector. Proper engineering and setup is vital to false alarm
> elimination and proper catch performance.

Balloons are so much fun. Milars are the worst. One call center with a 16
foot ceiling was quite a challenge. Everytime they had a party for somebody
they would have balloons loose in the building. The holidays were
particularly fun. Finally I walked in one day with an air rifle and put a
few holes in their ceiling tiles. I don't recall having the problem since
then.





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