Detecting, alerting and directing system

摘要

This is a system for the protection of personnel in an enclosed space. It comprises a danger detecting system such as a thermally operated electronic controller covering the area under protection, a distinctive audible alarm system which produces a recognizable sound or sound pattern audible throughout the area or enclosure to be protected, and visual directing means indicating the location of one or more exits and/or the direction in which a suitable exit lies. This visual directing system employs, preferably, a sign animated as by the flashing on and off of so-called strobe lights located at an exit, and the audible alarm signal is produced at the same exit. An auxiliary electric power supply system stands in reserve to take over the duty of providing electric power at any required time and, particularly, to be available for operating the detector circuits and the flashing light and warning sound circuits at low voltage from a storage battery which is constantly under recharge. The low voltage battery system can operate the protective and directing system for a reasonable time, such as 1 hour, in the event of failure of the commercial A.C. supply system.