| 摘要 |
PROBLEM TO BE SOLVED: To obtain a flow meter that a measuring object is not limited. SOLUTION: A measured passage 5 is connected between a plurality of flow meters 1, 2, 3 at an upperstream side, which are placed in parallel, and a flow meter 4 at a downstream side. A flow rate flowing down in the measured passage 5 can be measured by the flow meter 1, the flow meter 2 or the flow meter 3. On the other hand, when the flow rate flowing down in the measured passage 5 is fine the flow rate can be computed and measured as a difference between flow rate values measured by the flow meter 1 and the flow meter 4.
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