Self-testing security sensor for monitoring closure of vault doors and the like
A self-testing device is provided for a monitoring system for monitoring whether a closure member such as a door or window is closed. The monitoring system includes a switch unit mounted on the frame of the closure member being monitored and including magnetically biased switches connected in one or more electrical monitoring circuits, and a door magnet unit mounted on the closure member being monitored. The door magnet includes one or more permanent magnets that produce a magnetic field which, when the closure member is closed, cause said switches to assume a first state. When the closure member is opened, the switches switch to a second, alarm state. The self-testing device is electrically controllable from a remote location and produces a canceling or diverting magnetic field which simulates the effect of movement of the closure member from the closed position thereof without any actual movement of the member. 5 figs.
- Research Organization:
- Mason and Hanger Corporation
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-91AL65030
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5,633,626/A/
- Application Number:
- PAN: 8-520,634; TRN: 97:011396
- OSTI ID:
- 489086
- Resource Relation:
- Other Information: PBD: 27 May 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Alarm sensor apparatus for closures
Alarm sensor apparatus for closures