Dear Jim,
I have removed the magnetic contacts (reed
switches) from the door/window sensors and
soldiered the 5150 Sentrol glass break
sensors to the leads (which I cut down to
10.5 inches). The Sentrols are normally
closed, self generating piezo electrically
activating "vibration" sensors that upon a
significant flex in window glass, generate a
open circuit which the door/window sensor
monitors for and sends out an open tx to the
security console. The minimum amount of
flex to activate the Sentrol is listed as
50% of that force which is required to break
the glass (10' diameter glass protection).
In real terms, you have to beat the glass
pretty hard to get an open circuit so false
alarms are minimal (i.e. from banging, wind,
noise vibrations). Also, you can wire
muliple Sentrols to a single door/window
sensor.