Intruder detector for opening window - incorporating glass breakage detector and transformer monitoring window position

摘要

The intruder detector has at least one breakage detector (7) attached to the glass and a contactless inductive transformer, with the primary and secondary windings (6,9) attached to the window frame (2) and the window (3) respectively. The secondary winding is incorporated in the movable window catch so that it is aligned with the primary winding when the window is secured in the closed position. ADVANTAGE - Provides intruder alarm signal when window is broken or opened to gain entry.