Re: Stitch two glass breaks together?

["Jim" <alarminex@xxxxxxx>]

Total nerd wrote:
> I have a kitchen with big casement Anderson's in two areas -- one on
> the West wall and one on the North wall.  I understand you need to
> "point" a glass break acoustic sensor at the window, correct?  That
> means I need two, one pointing North and one pointing West.  I also
> have an English keypad with a 4-zone expander built into it next to the
> kitchen door.  Can I get two 2-wire acoustic sensors and daisy chain
> them together like magnetic sensors, or does it not work like that?
> And, can they be hooked into the zone expander in the napco keypad, or
> do they need to be plugged into the panel?
> On a related question -- how important is the acoustic sensor to be
> poiting exactly at the window in question?  I have another room with a
> row of windows long enough to take up the whole 25' wall.  If I point a
> sensor directly at the wall, it will only really "point" to two of
> them.  If, however, I mount it on the same wall as the motion sensor,
> it will "look down" the room, flanking all the windows.  Will it still
> work properly?  Is it just a microphone and pointing it at a window is
> not as impotant as it seems?
> thanks

There are audio glass break detectors that you can mount on the ceiling
that will cover an area of 60 feet in diameter or up to 30 feet if
mounted on a wall. See IEI's model 510.

As far as using the zones on the Napco keypad ..... no problem.
However, if you're going to use the power at the keypads for the Glass
break detector, it's not advised. The power for the keypads is not the
same as the Aux power output and if a short occurs, you'll disable the
keypads.
I guess, if you wanted to add an inline fuse holder off the keypad
voltage, it'd work, but you'd have to use a VERY small fuse, like
1/8amp, if there is such a thing. Also, keep in mind that each keypad
uses about a hundred mils when lit up, so you cant have a lot of
keypads. Each glass break detector uses about 30 mils. Putting two of
any kind of passive or active type sensor on one zone is not
recommended. Mainly because of the problems it causes when trying to
trouble shoot. If this is your own system, you may not care if it takes
you longer to find a problem. When you do this for a living, as we do,
finding the source of the problem, as quickly as possible is important.


If at all possible, run a new wire from the main panel for the glass
break detectors.