Measuring and testing – Gas analysis – Odor
Patent
1998-05-26
2000-02-01
Williams, Hezron
Measuring and testing
Gas analysis
Odor
73 232, 422 83, 422 93, G01N 3100, G01N 2700, A61B 500, G01D 2100
Patent
active
060189843
ABSTRACT:
Odors are detected and/or recognized by aspirating samples of odors and odorless air mutually exclusively into an aspirating input of a venturi mixing nozzle along with operating or dilution air and having an assessor or panelist sniff the output of the venturi to determine the presence or absence of odor and to identify an odor, if present. The dilution ratio for each sample tested is changed by feeding the sample odor, or odorless air, to the venturi selectively through branches having different sized restrictive orifices thereby obtaining a wide range of dilution ratios for a particular odor. The different branches are selected by electrically operated solenoid valves which are programmably activated by a programmable logic controller (PLC) as the assessor successively tests each sample. For each sample, the assessor makes three sniffing tests by operating a three position rotary switch before making a selection or decision as to the presence and/or recognition of an odor.
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Hasslen 3rd John S.
McGinley Charles M.
Wiggins J. David
Williams Hezron
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