| 摘要 |
PURPOSE: To provide a wide-range measurement-type flowmeter by which a flow rate in a wide range from a small flow rate up to a large flow rate can be measured with good accuracy. CONSTITUTION: A wide-range measurement-type flowmeter is provided with a fluidic flowmeter A which detects the flow rate of a spouting fluid when a periodic fluid vibration is generated in the spouting fluid spouting from a nozzle flow passage 21 in such a way that a proportional relationship exists between the frequency of the periodic vibration and the flow rate of the spouting fluid. In addition, the wide-range measurement-type flowmeter is provided with a rectangular flow passage-type flowmeter B which comprises a cross-sectionally rectangular flow passage 121 formed of a gap between two opposite faces and which measures the flow rate of a fluid flowing in the rectangular flow passage 121 on the basis of the difference pressureΔP between the upstream side and the downstream side of the rectangular flow passage 121. The fluidic flowmeter A and the rectangular flow passage-type flowmeter B are connected in parallel, and a changeover valve (a three-way valve) 150 by which a direction, in which the fluid flows, is changed over to at least one out of the fluidic flowmeter A and the rectangular flow passage-type flowmeter B.
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