Detector interconnect system
First Claim
1. An alarm apparatus for use with a controllable air handling system comprising:
- a plurality of ambient condition detectors wherein each detector includes at least an alarm output port, an interconnect input/output port, an air handling system output port and control circuitry coupled to the handling system output port;
a hardwired interconnect link coupled to a respective input/output port of at least some of the members of the plurality wherein in response to at least one of the interconnected detectors entering an alarm state, the remaining interconnected detectors each produce a respective air handling system control signal; and
wherein at least some of the detectors including circuitry having an alarm condition indicating output state wherein that state, when present at a detector, is coupled to the interconnect input/output ports of the members of the plurality but is coupled to the alarm output port of only the respective detector.
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Accused Products
Abstract
A duct mountable smoke detector includes a smoke sensor, an alarm indicating output relay, and an air flow control relay. In the presence of an alarm condition, the alarm indicating relay is energized thereby producing an alarm indicating signal. The air flow control relay is also energized thereupon changing an operative state of the respective air flow control element. Finally, a signal is coupled to an input/output interconnect port and, via an interconnect link, to other detectors coupled to the link. Other detectors coupled to the link which receive an alarm indicating interconnect signal energize the respective air flow control relays thereby changing operative state of the respective air flow control devices. The other detectors do not enter an alarm state. This allows for easy determination of the detector that initiated the alarm.
29 Citations
20 Claims
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1. An alarm apparatus for use with a controllable air handling system comprising:
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a plurality of ambient condition detectors wherein each detector includes at least an alarm output port, an interconnect input/output port, an air handling system output port and control circuitry coupled to the handling system output port; a hardwired interconnect link coupled to a respective input/output port of at least some of the members of the plurality wherein in response to at least one of the interconnected detectors entering an alarm state, the remaining interconnected detectors each produce a respective air handling system control signal; and wherein at least some of the detectors including circuitry having an alarm condition indicating output state wherein that state, when present at a detector, is coupled to the interconnect input/output ports of the members of the plurality but is coupled to the alarm output port of only the respective detector. - View Dependent Claims (2, 3, 4)
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5. An alarm apparatus for use with a controllable air handling system comprising:
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a plurality of ambient condition detectors wherein each detector includes at least an alarm output port, an interconnect input/output port, an air handling system output port and control circuitry coupled to the handling system output port; a hardwired interconnect link coupled to a respective input/output port of at least some of the members of the plurality wherein in response to at least one of the interconnected detectors entering an alarm state, the remaining interconnected detectors each produce a respective air handling system control signal; wherein at least some of the detectors including circuitry having an alarm condition indicating output state wherein that state, when present at a detector, is coupled to the interconnect input/output ports of the members of the plurality but is coupled to the alarm output port of only the respective detector; and wherein the control circuitry includes a bidirectional branch coupled to the input/output port, a unidirectional branch coupled to the detector and a unidirectional branch coupled to the air handling system output port wherein the branches share a common node.
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6. A duct detector comprising:
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a housing attachable to a duct of an air handling system; interconnect link circuitry carried by the housing; alarm indicating circuitry, coupled to the interconnect link circuitry; air system control output circuitry coupled to the interconnect link circuitry; at least one intake tube carried by the housing wherein the tube extends into the duct when the housing is attached thereto; and which includes a smoke sensor at least coupled to the tube whereby the sensor is exposed to at least some of the air in the duct. - View Dependent Claims (7, 8, 9, 10)
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11. A system of linked duct detectors wherein the detectors are mountable onto air flow ducts in a building being monitored, the system comprising:
a plurality of duct detectors wherein each detector includes a housing attachable to a respective duct, at least one sensor for monitoring air flowing therein for the presence of a selected ambient condition, control output circuitry for altering a respective duct flow parameter in response to the respective sensor detecting the selected ambient condition wherein the control output circuitry is couplable to a respective duct control element, wherein each detector includes a signaling port for sending signals to other members of the plurality in response to detecting the ambient condition and receiving signals from other members of the plurality and wherein each detector includes circuitry for responding to a received signal from another detector to alter only the respective duct control element. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An alarm apparatus for use with an air handling system having a plurality of ducts, the apparatus comprising:
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a plurality of ambient condition detectors wherein each detector is couplable to a respective duct and each includes at least one duct sensor, an interconnect input/output port, an air handling duct output port and control circuitry coupled to the duct output port; and an interconnect link coupled between respective input/output ports of at least some of the members of the plurality wherein in response to at least one of the interconnected detectors entering an alarm state, the remaining interconnected detectors each produce a respective duct control signal. - View Dependent Claims (18, 19, 20)
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Specification