Patent ID: 8679332
Filing Date: 2014-03-25
Classification: G01F,G01N

Abstract:
1. An apparatus for measuring flow rates of a liquid in a capillary system comprising: a flow-divider; a main flow path carrying liquid to said flow-divider; an operating flow path carrying a first portion of said liquid from said flow-divider according to a split ratio; a waste flow path carrying a second portion of said liquid from said flow-divider; a main flow sensor operatively disposed in said main flow path and configured to measure volumetric flow rates of said liquid in said main flow path to produce a main flow signal; a restrictor disposed in said waste flow path defining said split ratio; a waste flow sensor operatively disposed in said waste flow path between said flow divider and said restrictor and configured to measure volumetric flow rates of said liquid in said waste flow path to produce a waste flow signal; a subtractor receiving said main flow signal from said main flow sensor and said waste flow signal from said waste flow sensor and providing a difference signal representing a difference between said main flow signal and said waste flow signal; and a divider receiving said difference signal and said main flow signal and providing a quotient signal representing said split ratio of said flow-divider.