I'm considering adding break glass detection to our intruder alarm (the rear of our garden backs onto a public footpath). I'm reasoning that break glass would enable the system to detection intrusion that bit faster & possibly even deter entry into the building. (Detection inside the rooms is by dualtechs).

My question relates to the railway beyond the path - it carries mostly freight trains (coal) but does carry passenger trains at weekends. We get a fair amount of vibration from these trains, both low frequency from the heavy, slow coal trains & higher frequency from the faster passenger services.

I know that break glass works by detecting a particular signature of frequencies when the glass flexes & breaks - but would it/could it be conned by the vibrations from the trains & hence lead to false alarms

 

Personally I detest the things and would never dream of installing them on any of our sites.

The trains are unlikely to cause issue, the people on the path may, as below I'm not a fan of anything that can detect outside the protected area.

Squeaky brakes will cause a problem, plus the fact that double glazing is unlikely to be smashed for entry when there are much easier ways of getting in.  I would go down the route of siesmics/vibration detectors if you want perimeter detection.

 I would go down the route of siesmics/vibration detectors if you want perimeter detection.

 

Interesting. Wouldn't the vibrations be more likely to set of the likes of vipers? When the coal trains are heavy & slow you can feel the vibrations as they pass.

 

Thanks for your comments......

Do your doors/windows fall open when trains go by? The force required to open a locked door/window would be much higher than any non local siesmic events. So as long as the detectors are set up correctly they will be fine