Method of automatically measuring fluid flow rates
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United States of America Patent
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Mar 31, 1987
Grant Date -
N/A
app pub date -
Jun 7, 1985
filing date -
Jun 7, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method comprises providing at least two fluid flow channels of different sizes wherein each contain a temperature sensitive resistance fluid flow sensor. An electronic controller is provided with the electrical information from the temperature sensitive resistance fluid flow sensor. The electronic controller is provided with a data base including at least the calibration data between fluid flow rate and the electrical information from the resistance sensor and the designated fluid flow rates at which each of the flow channels other than the smallest that could be opened or closed. Next, the fluid whose flow rate is to be measured is caused to flow through the smallest flow channel. Then the electronic controller compares the flow rate through the smallest flow channel with the designated flow rate for the smallest channel and opens the next larger flow channel to fluid flow if the designated flow rate is exceeded or closes such flow channel if such designated flow rate is not exceeded. If the next largest channel is to be opened, the proceeding three steps are repeated for each succeeding pair of flow channels until the flow rate does not exceed the designated flow rate or until there are no more flow channels to be opened. Finally, the flow rate information from all of the flow channels is combined.
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