Flowmeter

摘要

Detecting a leak, or the like, with high accuracy on the basis of pressure and a flow volume acquired during use of fluid is made possible.;A volume of gas flowing through a flow path 102 is measured by a flow volume measurement unit 106, and pressure is measured by a pressure measurement unit 108. Measured flow data and measured pressure data are input to an analysis unit 112, to thus analyze following of a pressure change by a flow volume change. An amount of flow volume change responsive to an amount of pressure change of a predetermined level or more is classified into a plurality of ranges by means of a predetermined threshold value, and a following flow value change is determined on the basis of determination conditions of the respective ranges of amounts of flow volume changes.

主权项

1. A flowmeter comprising:
a flow measurement unit that measures a flow volume of fluid flowing through a flow path at a given interval to output flow data; a pressure measurement unit that measures pressure of the fluid to output pressure data; an analysis unit that receives the flow data and the pressure data and analyzes following of a pressure change by a flow volume change, that classifies an amount of flow volume change responsive to an amount of pressure change of a predetermined level or more into at least three ranges by means of a first threshold value and a second threshold value that is smaller than the first threshold value, and that determines a following flow volume change according to determination conditions for the respective ranges of amounts of flow volume changes, wherein the amount of flow volume change indicates a difference between a current flow volume and a past flow volume measured by the flow measurement unit, wherein the past flow volume excludes zero flow at the beginning of the fluid flowing through the flow path; and a processing unit that performs corresponding leakage control of a fluid supply valve according to a determination of a detected flow volume change performed by the analysis unit; wherein the analysis unit determines that the following flow volume change is detected when the amount of flow volume change is the first threshold value or more; determines that the following flow volume change is not detected when the amount of flow volume change is equal to or below the second threshold value; and determines that the following flow volume change is uncertain when the amount of flow volume change ranges between the first threshold value and the second threshold value.