| 摘要 |
A merchandise display security system for displaying and protecting an item of merchandise having a movable or removable cover includes a sensor configured to be attached to the cover. The sensor may include a magnet assembly that produces a magnetic field defining a predetermined minimum strength when the sensor is attached to the cover and the cover is closed on the item of merchandise. A transducer detects the presence of the magnetic field, or alternatively, changes in the strength of the magnetic field and generates an electrical signal corresponding to the strength of the magnetic field, for example an output voltage. The transducer communicates the electrical signal to electronics that activate an alarm if the strength of the magnetic field is less than a predetermined minimum strength or greater than a predetermined maximum strength. |
