FLUID FLOW DETECTION SYSTEM EMPLOYING SAMPLING TECHNIQUE
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United States of America Patent
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N/A
Issued Date -
May 31, 2001
app pub date -
Apr 15, 1999
filing date -
Apr 15, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An apparatus and system for monitoring liquid flow and detecting low flow conditions. The apparatus includes a liquid collection reservoir having a cavity, an inlet through which liquid enters the reservoir cavity, and an outlet through which the liquid drains from the cavity. A first flow restrictor upstream of the inlet is selectably openable and closeable to regulate flow of the liquid into the cavity, and a second flow restrictor downstream of the outlet is selectably openable and closeable to regulate flow of the liquid from the cavity. A controller controls the state of the flow restrictors to alternately open the first flow restrictor and simultaneously close the second flow restrictor for a first period of time to allow fluid to enter and remain in the cavity, and then close the first flow restrictor and simultaneously open the second flow restrictor for a second period of time to prevent fluid from entering the cavity and allow fluid to drain from the cavity. A sensor operatively associated with the cavity senses whether liquid in the cavity reaches a preselected level during the first period of time.
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