Flowmeter and flow control device

Measuring and testing – Volume or rate of flow – Thermal type

Reexamination Certificate

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Reexamination Certificate

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07730777

ABSTRACT:
A simply structured flowmeter in which an influence of a dilatational wave on a thermal flow rate sensor is suppressed, and measurement accuracy is enhanced.The flowmeter has not only the thermal flow rate sensor that is placed to face a flow channel and detects a flow rate of fluid flowing through the flow channel but also a micro path (for example, narrow pipe) that is provided to the flow channel and blocks a dilatational wave created in the flow channel from being transmitted to the thermal flow rate sensor.

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European Search Report dated Dec. 4, 2008, issued in counterpart European Application No. 08151377.2.
H.L. Boerrigter, et al., “Design & Calibration of an Unsteady Pressure Measurement System”,Instrumentation in Aerospace Simulation Facilities, Sep. 29, 1997, pp. 185-194, New York, NY, USA.

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