Burglar alarms

[John Smith]

Looking for some advice on the most appropriate sensors for a moored
cruiser. I have switches on the door, the hatch and some windows, I have
two infra red motion detectors and a pressure mat.

Are the IR detectors any good on a boat that sways a lot in the wind etc?
Any other options?

Thanks in advance

 

[Jean Dufour]

IR sensors will detect the heat generated by someone in your boat. It's
ultrasound sensors that would be trigered by the motion of something moving
in your boat. But what if the boat's interior is heated to higher than the
body's temperature on a sunny day? I dunno enough about this to risk a
categoric answer. But I GUESS it would generate a false alarm.

Jean Dufour
Montreal, Qc

 

[Haakon Dybdahl]

I think IR sensors set off an alarm when the "picture" of IR changes. I have
done some testing with home security alarams, and if you really move slowly,
the alarm will not go off.

Haakon

 

[padeen]

Anyone found a source for 12 volt IR detectors?

 

[Marcus AAkesson]

Anyone found a source for 12 volt IR detectors?

I hope You are joking, as they are all 12V for normal alarm use.
/Marcus
[/QUOTE]

 

[padeen]

Marcus, are you capable of understanding that your post reveals our combined
ignorance? I'm an electrician who's been installing 120V IR sensors for
many years, but haven't had any alarm experience. You, on the other hand,
see the world from the 12V side. Shall we both broaden our knowledge?

Padeen

 

[padeen]

The 120V sensors will control anything you want them to control, and have
considerable adjustment capabilities so as not to "react on anything",
including small animals, wind-propelled trees, or street traffic. But of
course all 12V alarm systems would have 12V sensors! However, I would
expect that the internal sensor electronics for both 12 and 120V is
essentially similar, with the difference being only in the PS & switch.

Padeen

 

[Larry]

Anyone found a source for 12 volt IR detectors?

Pretty sure you can buy them from Eastern Distributors since you're an
electrician. They're available from all the alarm wholesalers - Ademco,
Tri-State, etc. - but they might not be willing to sell to you without a
bunch of rigamarole.

 

[Marcus AAkesson]

Marcus, are you capable of understanding that your post reveals our combined
ignorance? I'm an electrician who's been installing 120V IR sensors for
many years, but haven't had any alarm experience. You, on the other hand,
see the world from the 12V side. Shall we both broaden our knowledge?

No offense meant!

I'm very well aware of all the AC (here 230V) IR sensors around, but
as the subject of the main thread was "Burglar alarms", the field of
application was pretty much given.

Since a fundamental requirement of alarm systems is to run on backup
power, everything is DC (usually 12V), just like in a boat (how
convenient) !

I have a boat alarm based on switches and an IR sensor and haven't had
any problems with false alarms. There are many nice products in the
market, and the latest offer positioning, alarm and remote control by
GSM/SMS. You can check the wind conditions from work, and then decide
to go out or not. Nice.

http://www.seakey.com/indexe.htm

http://www.boatgard.com/en/index.htm


/Marcus
[/QUOTE]