sensor for glassbreak in skylight

[unclebob1]

So i'm installing two skylights - 2m by 1m in size.
These are an obvious potential entry point. The glass itself will be laminate on the outside, with k glass in a sealed unit inside, and stuck down making it almost impossible to remove by lifting it once installed.

So question is what should i have have installed there to detect an attempted forced entry?
glass break will need installing on a side wall, rather then connected to it?
Vibration sensor will be stuck to the glass (no frame) to the potential thief will be able to see the connection side...

Any suggestions?

 

[Budnzeus]

If the only way in is by smashing the glass I would suggest a break glass detector or even a pir in the room the skylight leads too

 

[Aunsh]

Or even a PIR with built-in glass break, such as a Honeywell ADE 81R115?

 

[EightyTwo]

Georgian wired glass?

The Honeywell FG1615 family (Flexguard) detectors are pretty good.

 

[Europlex]

A vibration sensor fitted adj to the glass will operate if setup correctly, been done many times. They do work.

 

[unclebob1]

There will be two pirs cover the room anyway, but hoping alarm can be set off as attempt to enter rather then once the thief is in! How close does the vib sensor need to be? The mounting around it is ply 12mm.

Thought about duel tech but not sure how it will work if the skylight is up in a raised part of the ceiling and the dueltech has no "sight" of the glass and isnt near it either.

 

[Europlex]

As vibration detectors are looking for high frequency vibration caused by breaking glass, hammering of walls, splintering wood etc., they should be fitted in accordance with the instructions that will be with the detector. If fitting more than one to a circuit make sure that you do wire as I have said so that you will know which detector activated (in the case of a false activation).

Good idea doing this, alarm activated before entry is made, ideal situation for the use of vibration detectors.

 

[OwainDIYer]

It's old-fashioned but foil strip is effective and very visibly obvious from outside, and difficult to defeat.

 

[Europlex]

Who's showing his age then?

 

[EightyTwo]

Window foil - Not the most reliable thing, I seem to remember! I'd want it to be easily accessible...

 

[Europlex]

Just thought, foil on a skylight is not such a good thing, it will be cooked by the sun in no time (if we have any again that is) and need replacing as it will look a mess. Not the easiest thing to do up there anyway even if you know what you are doing anyway.

 

[unclebob1]

most likely go with vibration sensor.

Just a thought along the lines of foil, current "k-glass" has a layer of something which is actually conductive... in theory i guess you could find a method to securely attach two wires apart from each other, calculate resistance, and then adjust accordingly and use as a sensor... Break the glass and flow is also broken.
suspect there would be a large number of issues/faults with it in real life though.

 

[bernardgreen]

By coincidence I have been asked to look at a similar application for a friend's new kitchen extension with three skylights. Break beams suit the application very well. In the kitchen a single beam will cover two skylights but this requires a mounting below the ceiling. Using a beam per skylight allows the sender and receiver to be fitted in the skylight.

 

[unclebob1]

Thanks for the reply bearnard,
I'm hoping the alarm can be set of before they get in, rather then once they are in hopefully!

 

[Europlex]

Point to point beams Bernard, what are you on?

Here is the device made for this job, goes off BEFORE entry.