Variable air speed aspirating smoke detector
First Claim
Patent Images
1. A detector comprising:
- a smoke sensor with a gas inflow port;
a variable speed aspirator coupled to the sensor; and
control circuits coupled to the sensor and the aspirator, and responsive to a sensed smoke indicator, the control circuits change an aspirator speed parameter from one value to another and where the control circuitry carries out a determination as to whether dust is present in the sensor.
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Abstract
An aspirated smoke detector includes a smoke sensor, an aspirator and variable speed control circuits. As the concentration of smoke increases, the speed control circuits can increase aspirator speed from a first, nominal value to a second, higher value.
59 Citations
17 Claims
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1. A detector comprising:
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a smoke sensor with a gas inflow port; a variable speed aspirator coupled to the sensor; and control circuits coupled to the sensor and the aspirator, and responsive to a sensed smoke indicator, the control circuits change an aspirator speed parameter from one value to another and where the control circuitry carries out a determination as to whether dust is present in the sensor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An aspirated detector comprising:
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a housing; a particulate sensor carried by the housing; a variable speed aspirator; and aspirator speed control circuits, coupled between the particulate sensor and the aspirator, and responsive to detecting the presence of particulate matter, the speed control circuits alter aspirator speed and categorize the particulate matter if dust. - View Dependent Claims (8, 9, 17)
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10. A method comprising:
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establishing an initial speed of atmospheric flow into a sensing region; sensing, at the sensing region, airborne particulate matter; determining if a predetermined concentration of particulate matter is being sensed; responsive to the determining, increasing the speed of atmospheric flow into the sensing region; conducting a further analysis of particulate concentration; and responsive to the continuing presence of particulate matter, decreasing the speed of atmospheric flow into the sensing region below the initial speed. - View Dependent Claims (11, 12)
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13. A detector comprising:
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a housing; an airflow input port defined by the housing; a variable speed aspirator with an airflow intake and an airflow output; a smoke sensor in flow communication with one of the airflow intake, or the airflow output; speed control circuits coupled between the aspirator and the smoke sensor, and responsive to an output signal from the smoke sensor, the speed control circuits increase aspirator speed from an initial value to a higher value and which includes airborne particulate analysis circuits which are coupled between the output signal from the smoke sensor and the speed control circuits and where the analysis circuits, prior to determining if a fire condition is present, reduce aspirator speed below the initial value. - View Dependent Claims (14, 15, 16)
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Specification