Replying to BraveSirRobbin,
Gap at sensors is 1/4" to 3/8".
Voltage measurements at Elk panel are:
Zone 7, Bedroom Window, Closed 0.30, Open 13.65
Zone 14, Great Room Window, Closed 0.04, Open 13.65
Zone 17, Kitchen Window, Closed 0.00, Open 13.59
All of these zones have given false alarms...