Abstract: A burglar alarm system to detect the breaking of a pane of a sealed multiple pane panel comprises in one embodiment a sensor responsive to the humidity intermediate the panes of the panel, a burglar alarm, and a microprocessor or detector operably connected to the sensor and alarm, the detector being adapted to actuate the alarm when the sensor detects a change in the humidity. In a preferred embodiment the system comprises a sensor responsive to an atmospheric parameter (such as humidity or pressure) intermediate the panes of the panel, a burglar alarm, a slow leak warning device, and a detector operably connected to the sensor on the one hand and the alarm and warning device on the other hand.