Patent ID: 6823743
Filing Date: 2004-11-30
Classification: G01N

Abstract:
A method for measuring concentrations of components of a fluid, comprising:conducting a fluid sample through a measuring tube having a small aperature with a constant diameter and a cross-sectional area â€œAâ€  in a fluid flow path; and measuring a pressure difference â€œ(P1âˆ’P2)â€  between an upstream and a downstream of the small aperture and measuring a flow rate â€œQâ€  at the downstream of the small aperture by using a flow meter of thermal conductivity type; calculating a density â€œdâ€  of the fluid sample by using an equation below; and Q=cA{2(P1âˆ’P2)/d}1/2 (c is the flow constant of the fluid sample) determining the concentrations of the components of the fluid merely from the density â€œdâ€ , wherein the fluid sample is a two-component fluid, and one component of the two-component fluid is an IR-inactive gas selected from the group consisting of N2, O2, He, Ar, Kr and Xe.