FLUID FLOW CONTROL SYSTEM

摘要

An instrument having a fluid sample treating chamber incorporating a flow control system which maintains a constant fluid sample flow to the treating chamber. The fluid sample is drawn to the chamber along a passage having two flow restricting devices in series. A bypass line has an inlet connected between the flow restrictive devices and another inlet in communication with a supplemental fluid supply. Regulating means in the bypass line governs the amount of supplemental fluid pumped through the bypass line, to thereby influence the fluid sample pressure between the flow restrictive devices and the flow of the fluid sample to the chamber.