snippet: Swivel Plate. Use with an ISN-SM-80 Seismic Detector to monitor safes and strong room doors with exposed keyholes. A microswitch in the swivel plate monitors every movement so that any unauthorized swiveling immediately triggers an alarm. When the system is armed, the keyhole is completely covered by the hardened-steel swivel plate. When the system is disarmed, the swivel plate easily swings 90° away from the keyhole.

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