Patent ID: 6446503
Filing Date: 2002-09-10
Classification: G01F

Abstract:
A flowmeter comprising:a pipe including a single flow path having a cross-sectional area which is almost uniform along a flow of a fluid, in which a measurement zone for smaller quantity of flow and a measurement zone for larger quantity of flow are provided along the longitudinal direction of the flow path; a flow path dividing member provided in the measurement zone for smaller quantity of flow in the flow path of the pipe to divide the flow path into a plurality of narrower flow paths each having a smaller cross-sectional area; a first flow velocity sensor provided in the measurement zone for larger quantity of flow in the flow path of the pipe, for outputting a signal according to a flow velocity of the fluid passing through the measurement zone for larger quantity of flow; a second flow velocity sensor that is disposed in one of the plurality of narrower flow paths formed by the flow path dividing member that is closest to a wall face of the pipe, for outputting a signal according to the flow velocity of the fluid passing through the narrower flow path that is closest to the wall face, the second flow velocity sensor being attached on the wall face of the pipe; and flow quantity calculating means for calculating a quantity of flow on the basis of at least one of the output signal of the first flow velocity sensor and the output signal of the second flow velocity sensor, in accordance with the quantity of flow.