Patent ID: 6481299
Filing Date: 2002-11-19
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; 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; a tunnel connected to said mixer and including a gas mixing passageway extending a length for homogeneously mixing the gases together, said gas mixing passageway having a tapered end portion tapering toward said second end portion to ensure that the particulate matter mixes with the gases along said length of said gas mixing passageway without collecting in a recirculating flow area.