Multi-vortex flowmeter employing volume flow rate as...

Details Multi-vortex flowmeter employing volume flow rate as... Multi-vortex flowmeter employing volume flow rate as...

2011-03-01

2011-03-01

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

C073S204210

Reexamination Certificate

active

07895904

ABSTRACT:
A multi-vortex flowmeter includes a vortex flowmeter for measurement by volume flow rate and a thermal flowmeter for measurement by mass flow rate to selectively use the two flowmeters according to the flow rate of fluid to be measured flowing through a flow channel. The multi-vortex flowmeter has a switching point between two flowmeters based on the mass flow rate. A mass flow rate Qm at the switching point in a range larger than the minimum flow rate of a vortex flowmeter and smaller than the maximum flow rate of a thermal flowmeter is determined by: Qm=K3*√P. Alternatively, a volume flow rate Q at the switching point in a range larger than the minimum flow rate of a vortex flowmeter and smaller than the maximum flow rate of a thermal flowmeter is determined by: Q=K1/√P.

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International Search Report mailed Jul. 3, 2007 for International Application No. PCT/JP2007/059280.

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