Patent ID: 6505524
Filing Date: 2003-01-14
Classification: G01N

Abstract:
A mixing system for diluting gases, the mixing system comprising:a mixing portion; a gaseous inlet for receiving the gases, the gaseous inlet being in flow communication with the mixing portion; a dilution inlet for receiving a dilution gas at a dilution gas flow rate, the dilution inlet being in flow communication with the mixing portion; a mixture outlet in flow communication with the mixing portion; a flow meter in flow communication with the dilution inlet, the flow meter having an output indicative of the dilution gas flow rate; a dilution sample line with first and second ends the first end being in flow communication with the dilution inlet and configured to sample the dilution gas at a dilution sample flow rate such that a remaining, unsampled, portion of the dilution gas proceeds to the mixing portion and the dilution gas sample remains unmixed for dilution gas analysis at the sample line second end; a dilution sample flow controller along the dilution sample line, the dilution sample flow controller being operable to vary the dilution sample flow rate through the dilution sample line; and control logic receiving the flow meter output, the control logic processing the flow meter output and operating the dilution sample flow controller to vary the dilution sample flow rate in response to variations in the dilution gas flow rate such that the dilution sample flow rate tracks a value which is substantially proportional to the dilution gas flow rate.