Self-testing security sensor for monitoring closure of vault doors and the like

Patent · Tue May 27 04:00:00 EDT 1997

OSTI ID:489086

Cawthorne, D C

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
• OSTI ID: 489086
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
ALARM SYSTEMS
DESIGN
INTRUSION DETECTION SYSTEMS
MONITORING
PERFORMANCE TESTING
PHYSICAL PROTECTION
REMOTE SENSING
SIMULATION
SWITCHES