Sentrol, Inc.

David S Terrett

Douglas Henry Marman

Michael E Fossey

Mark A Peltier

Kevin B McDonald

Michael Benowitz

Stephen W Pierce

An improved environmental alarm system has centralized control of local sensor display capabilities displays, on the sensor itself, a variety of sensor data including sensor address, and detected levels of one or more environmental conditions. Alphanumeric characters are displayed at individual sensors in response to commands from a master microprocessor directing local sensor display content and timing. A local microcontroller within each sensor interprets the detected signal and prepares a resulting data signal that is available for downloading into the alphanumeric display in compliance with a coded message from the master microprocessor.

Smoke detector with digital display

A magnetically actuated switch system (10) has reduced sensitivity to false alarms and reduced power consumption and resistance to physical and magnetic tampering. The system includes a signal processing circuit controlled by a microprocessor (16) that selectively enables magnetic sensors (12, 38), and compares the corresponding sensor outputs (76) to automatically calibrated level and predetermined timing characteristics.

Time multiplexed, false alarm resistant magnetically actuated security

Growing community of inventors

Hickory, NC, United States of America

David S Terrett