Patent ID: 6742407
Filing Date: 2004-06-01
Classification: G01N

Abstract:
A particulate sampler for use in analyzing particulate matter in exhaust gas from an emissions source, said sampler comprising:a transfer tube assembly including a probe at least partially defining a sample exhaust gas passageway having a first end portion with an opening for receiving the exhaust gas from the emissions source and extending to a second end portion, said transfer tube assembly includes an outer tube surrounding at least a portion of said probe to define an insulator cavity to maintain a temperature of the exhaust gas in said sample exhaust gas passageway, wherein said probe has a wall thickness of approximately 0.020 inch and less; a mixer receiving said second end portion, said mixer including a dilution gas passageway for carrying a dilution gas with said dilution gas passageway in communication with said sample exhaust gas passageway for introducing dilution gas to the exhaust gas; and a tunnel connected to said mixer and including a gas mixing passageway extending a length for homogeneously mixing the gases together with a mixing orifice arranged between said second end portion and said gas mixing passageway, and the exhaust gas and the dilution gas commingling prior to flowing through said orifice to said gas mixing passageway.