Hey,

Im thinking about what I need for a new system and I am wondering why you cant just use vibration sensors on the doors/windows.

Why could/should you use the magnetic sensors aswell?

I mean if the window is forced open or smashed that should set off the vibration sensor, are there cases that wont set it off but the magnetic one would go off?

thanks for any help!

Usually the shock sensor will suffice, subject to the window/door being closed in the first place, fitting contacts as well ensures that they are shut as the system wont set otherwise.

Usually the shock sensor will suffice, subject to the window/door being closed in the first place, fitting contacts as well ensures that they are shut as the system wont set otherwise.

ahh yeah, good catch

Not much use in haveing vibration sensors if the door is left open

so on the access points that are used a lot (front/back door, say kitchen front room windows) you should double up.

My front room is a large window with 3 panes of glass.

Would you need a vibration sensor on each pane, well actually say on the two supports in the middle or would one suffice?

(or is that a how long is a piece of string question?)

Right now there is only one...

The downside of vibration sensors is they are easy to activate and so any spurious knocking or vibration will cause false alarms which are very difficult to diagnose the cause.

Bird flying into glass, someone knocking, some kids tennis ball, passing truck or bus, window cleaner etc etc etc.

Bird flying into glass, someone knocking, some kids tennis ball, passing truck or bus, window cleaner etc etc etc.

A Shockguard II then

ahh yeah, good catch

Not really he does do this for a living.

so on the access points that are used a lot (front/back door, say kitchen front room windows) you should double up.

Not unless you are totally paranoid or a tobacco importer.

Another DIY beauty coming on with MT2 everywhere no doubt!

And 5 detectors on the same zone

Went to a fault the other day - customer reports Zone 2 going off. Looks on the database in office and it says 3 x ground floor doors. Gets to site - has a scratch etc etc - starts to look at doors to find 3 then 4 then 5 then 6 ----I think it was 26 in the end doors in series!!!!!!

Then looks in the paper log and this is about the 5th call out his year for Z2. Told the customer he could do with a rewire and some expanders.

For those of you that replied with usefull on topic replies, thanks

for those that always feel the need to show how elite and brilliant they are, please stay off my threads unless you have something usefull or ontopic to add.

Man there is such an attitude on this site.

I'm posting in the DIY forum about a DIY question and you feel the need to try an belittle me, playground behavior guys, and a p*** poor attitude.

Maybe get out a bit more and check out someother boards, you will see that mods/"super"members are willing and eager to help people who ask questions.

Edited December 13, 200520 yr by Zak