Patent ID: 7859395
Filing Date: 2010-12-28
Classification: F24F,G08B,Y02B

Abstract:
1. A system comprising: at least two duct detectors, each with an ambient condition sensor, a visual status indicator, an interface and control circuitry; a duct detector control unit, the duct detector control unit having at least two duct sensor ports, a medium associated with each of the at least two duct detectors, the medium connecting the associated duct detector with a respective one of that at least two duct sensor ports, control circuitry of the duct detector control unit that communicates with the interface and control circuitry of the detectors through the at least two duct sensor ports on a per port basis and in a bi-directional manner where the control circuitry further comprises: a processor programmed to directs control commands including queries for sensor data to the respective at least two duct detectors and receives sensor data from the at least two ports; a processor programmed to analyze the received sensor data from the respective at least two duct detectors, to determine the existence of an alarm based upon the received sensor data from at least one of the at least two duct detectors, to initiate an alarm condition from the analyzed sensor data and to control the visible status indicator on the at least one of the at least two duct detectors to indicate the alarm condition rather than to have the at least one of the at least two duct detectors control the visual indicator independently; at least one relay, and a port for communicating with a displaced display unit, wherein the control circuitry of the control unit assigns a priority to each duct sensor of the at least two duct sensors, and makes an alarm determination relative to each duct sensor associated with the at least two duct sensor ports on a per sensor basis based upon the analyzed sensor data and, responsive at least in part to the assigned priorities, activates the at least one relay where the assigned priorities are used to activate the at least one relay without effecting a state of the visible status indicator on each of the at least two duct sensors.