Abus potential free glass breakage detectors white brown abus fu7300w p the abus fu7300w potential free glass breakage detector white is ideal for monitoring individual window panes the detector is fixed to the window pane to be protected the ultrasound signals resulting from glass breakage are detected and reported to the alarm centre p p the passive glass breakage detector is fixed between 20 50mm from the window frame important the detector should be fixed in such a way that you