Patent ID: 7255834
Filing Date: 2007-08-14
Classification: G01N,Y10T

Abstract:
1. A method for controlling oxygen flow during elemental analysis, the method comprising the steps of providing a combustion reactor; providing a gas chromatographic analyzer connected to said combustion reactor; providing a pneumatic circuit connected to said combustion reactor and to said gas chromatographic analyzer; passing a carrier gas through said pneumatic circuit, first through said combustion reactor and then to said gas chromatographic analyzer; providing an oxygen feed line connected to said pneumatic circuit at an injection point upstream of said combustion reactor, said oxygen feed line including a restriction arranged upstream of said injection point; measuring pressure in said oxygen feed line upstream and downstream of said restriction; feeding oxygen from said oxygen feed line into said pneumatic circuit; and adjusting one of an amount and a duration of the oxygen fed to said pneumatic circuit by adjusting said pressure upstream and downstream of said restriction.