Looking for experience and strong opinions on detecting intrusion through glass doors.
We are looking to add access control to a large number of aluminum-framed glass doors. These are in large spaces and will be monitored after hours only. Motion sensors are not an option. We will be putting positions sensors on the doors one way or another.
Right now I am tending towards acoustic glass break sensors like the Interlogix ShatterPro. I am a bit concerned that these are inadequate though, as I have heard that even modern glass break sensors can be circumvented by cutting the glass or muffling the sound of striking glass. There will also be cleaning staff working with loud equipment every night.
I am looking at vibration sensors (like the Seco-Larm Enforcer) and glass shock sensors but these add a lot of complexity and install work. We can handle the occasional false alarm, but I don't want to double our work load by adding extra sensors to every door unless necessary; most of these doors are in pairs or in groups of four to eight, and ideally we would like to cover at least that many with each sensor.
Does anyone have dos and don'ts, or alternatives?