John A Beyer

US Patent:

51561948, Oct 20, 1992

Filed:

Oct 26, 1990

Appl. No.:

7/604915

Inventors:

John O. Beyer - Midland MI

Assignee:

The Dow Chemical Company - Midland MI

International Classification:

B65B 328

US Classification:

141 1

Abstract:

A method and system for dispensing a fluid to provide a predetermined weight percent concentration of a sample material to the fluid. An estimated density value for the fluid is used to determine the volume of fluid to dispense in an initial injection of fluid which is less than the total volume of fluid required to achieve the predetermined weight percent concentration. A working fluid density is then determined from the volume of fluid dispensed and a measurement of the weight of the fluid dispensed. The working density is then used to determine the volume of fluid to dispense in a subsequent injection. Preferably, at least three fluid injections are performed, and the working density is determined after each fluid injection.