Duct Detector with Improved Functional Test Capability
First Claim
1. A particulate detector for use in a ventilation duct, comprisinga main housing;
- a detector assembly disposed within the main housing, the detector assembly including a detector housing, a filter screen, a detector chamber, a light emitter, and a light detector;
at least one test light disposed within the main housing adjacent to the detector assembly; and
a plurality of labyrinth members defining at least a portion of the detector housing, wherein the labyrinth members allow light emitted by the at least one test light to pass through the detector housing.
7 Assignments
0 Petitions
Accused Products
Abstract
A device and method for facilitating convenient functional testing of a duct detector is provided. The device includes a duct detector having a remote-controlled test light mounted in a housing thereof, and a detector chamber defined by a filter screen and a plurality of labyrinth members that allow light emitted by the test light to enter the detector chamber. A functional test of the duct detector can be conducted by activating the test light. If the detector is functioning properly, an amount of light emitted by the test light will be detected by the light detector, thereby simulating the presence of an excessive amount of particulate within the detector chamber. The light detector will then generate an output signal that will cause the actuation of alarms and/or the deactivation of a blower system, thereby indicating functionality of the duct detector.
13 Citations
21 Claims
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1. A particulate detector for use in a ventilation duct, comprising
a main housing; -
a detector assembly disposed within the main housing, the detector assembly including a detector housing, a filter screen, a detector chamber, a light emitter, and a light detector; at least one test light disposed within the main housing adjacent to the detector assembly; and a plurality of labyrinth members defining at least a portion of the detector housing, wherein the labyrinth members allow light emitted by the at least one test light to pass through the detector housing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for testing the functionality of a duct detector comprising:
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emitting light from at least one test light located in a housing of the duct detector; at a light detector located in the housing, receiving a portion of the light emitted from the at least one test light, wherein the received light passes through a plurality of labyrinth members positioned between the test light and the light detector; determining if the light received at the light detector exceeds a predetermined threshold; and signaling an alarm when the light received at the light detector does not exceed the predetermined threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A particulate detector for use in a ventilation duct, comprising
a main housing; -
a detector assembly disposed within the main housing, the detector assembly including a detector housing, a filter screen, a detector chamber, a light emitter, and a light detector; at least one test light mounted on the detector housing; and a plurality of labyrinth members defining at least a portion of the detector housing, wherein the labyrinth members allow light emitted by the at least one test light to pass through the detector housing.
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Specification