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US 6,285,291 B1Granted
Detection of airborne pollutants
AssigneeVision Products Pty. Ltd.
InventorsRonald Knox, Christopher T. Ryan, Hugh Stevenson
Life of this patent
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AssigneeVision Products Pty. Ltd.
InventorsRonald Knox, Christopher T. Ryan, Hugh Stevenson
Estimating the term…
A smoke detection system comprises a manifold (4) connected to a series of sampling pipes (2). A fan (6) which draws a large volume of sampling air through the sampling pipes is connected to the inlet manifold and a small proportion of that air is directed to the inlet of a smoke detector (12), the outlet of which is connected to the manifold. The configuration obtained by the connection of the outlet from the detector into the inlet manifold provides a large pressure drop across the flow path through the detector. As a result of the large pressure drop, a filter (10) for removing dust and other contaminants can be incorporated in the flow path and the filter can also incorporate a fine filtering stage to produce a secondary clear air flow which can be directed into the detector to prevent smoke particles from settling on critical components of the detector.
A smoke detection system comprising an inlet adapted for connection to one or more sampling pipes lying upstream of said inlet, an aspirator for drawing sampling air through the inlet, and a smoke detector having a detector chamber for receiving sampling air discharged from an outlet of the aspirator via a flow control, an outlet from the detector chamber being directly connected to said inlet, said flow control permitting a small portion of the outlet flow from the aspirator to be fed through the detector chamber for detection purposes with substantially the entirety of the sampling air flow fed through the inlet from the or each sampling pipe being discharged to exhaust from the outlet of the aspirator.
Dependencies are inferred from the claim text.