Patent ID: 7631566
Filing Date: 2009-12-15
Classification: G05D,Y10T

Abstract:
1. An apparatus for diluting a heated gas sample comprising at least one condensable component, the apparatus comprising: at least one thermally insulated wall enclosing a dilution cooler chamber having a sample gas inlet end having a sample gas inlet opening and an opposed dilute sample gas outlet end having a dilute sample gas outlet opening; a porous conduit disposed within said dilution cooler chamber providing fluid communication between said sample gas inlet opening and said dilute sample gas outlet opening and forming an annular region between said porous conduit and said at least one thermally insulated wall; dilute gas means for introducing an inert gas into said annular region; temperature means for measuring a temperature within said annular region; a thermally insulated coaxial nozzle disposed within said sample gas inlet opening; and feedback control means for controlling a dilution ratio within said porous conduit based upon a concentration of condensable components in a sample gas.