Measuring and testing – Volume or rate of flow – By measuring electrical or magnetic properties
Reexamination Certificate
2008-09-08
2011-11-22
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
By measuring electrical or magnetic properties
Reexamination Certificate
active
08061217
ABSTRACT:
An apparatus for measuring a flow rate of a powder when a powder is conveyed by using air as a carrier gas, which apparatus measures the flow rate based on the change of capacitance of the powder to be measured. The apparatus that can measure the flow rate of a powder with high accuracy by compensating for the effect of the thermal drift of the capacitance. It includes a protecting pipe for conveying a powder, a housing pipe having measuring electrodes, and a transducer for outputting an output of the measuring electrode to a display. It further includes an atmospheric temperature sensor and a carrier gas-temperature sensor31. The sensor31is directly fixed to the protecting pipe20at a place that does not overlap the housing pipe10, and includes a circuit for compensating for the output of the measuring electrode, which output is the capacitance determined based on a graph of a curve of the relationship between a capacitance and a flow rate, based on the difference between the output of the atmospheric temperature sensor and the output of the carrier-gas-temperature sensor.
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International Search Report, PCT/JP2008/066176, dated Dec. 2, 2008.
Aramatsu Yoshiki
Hisada Wataru
Shintani Mitsuo
Yamaguchi Manabu
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Patel Harshad
Sintokogio Ltd.
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