| 摘要 |
A flowmeter capable of measuring an accurate quantity of flow over a wide range of the quantity of flow. A measurement zone (15) for smaller quantity of flow and a measurement zone (16) for larger quantity of flow are determined inside a flow path (13) of a pipe (10). Regulating strainers (14) for regulating the flow of a gas (20) are disposed inside the measurement zone (15) for smaller quantity of flow by dividing the flow path (13) into a plurality of narrower flow paths (14A). A mean flow velocity of the gas (20) flowing through each of a plurality of narrower flow paths (14A) becomes substantially equal. A part of the gas (20) reaches nozzles (22a, 22b) erected across flow velocity sensors (15a, 15b) for smaller quantity of flow and is accelerated by the operation of these nozzles. The flow velocity sensors (15a, 15b) inside the measurement zone (15) for smaller quantity of flow output signals corresponding to the flow velocity of the gas (20) passed through the narrower flow path (14a) and accelerated by the nozzles (22a, 22b) in the range of the smaller quantity of flow. Flow velocity sensors (16a, 16b) for larger quantity of flow in the measurement zone (16) for lager quantity of flow output signals corresponding to the flow velocity of the gas (20) in the range of the larger quantity of flow.
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