Patent ID: 6729195
Filing Date: 2004-05-04
Classification: G01N

Abstract:
A gas sampling system, comprising:a plurality of diluters arranged in a serial array along an axial extent; a source of dilution air fluidically connected to each one of said plurality of serially arranged diluters so as to supply dilution air into each one of said plurality of serially arranged diluters such that said dilution air is supplied into a gas stream present within each one of said plurality of serially arranged diluters so as to progressively dilute said gas stream as said gas stream flows through said plurality of serially arranged diluters; sampling apparatus fluidically connected to each one of said plurality of serially arranged diluters for obtaining and analyzing a sample of said diluted gas stream present within each one of said plurality of serially arranged diluters; and a plurality of diluent mass flow controllers (DMFCs) disposed fluidically upstream of said plurality of serially arranged diluters for monitoring the mass flow of dilution air being supplied to said plurality of serially arranged diluters, and at least one total mass flow controller (TMFC) disposed fluidically downstream of said plurality of serially arranged diluters for monitoring the mass flow of diluted air stream flowing through said plurality of serially arranged diluters.