Purge and trap concentrator with sparge vessel

Chemistry: analytical and immunological testing – Including sample preparation

Reexamination Certificate

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Details

C436S181000, C436S161000, C073S023200, C073S023350, C073S023410, C073S023420

Reexamination Certificate

active

07951609

ABSTRACT:
A purge and trap concentrator system that includes a sparge vessel, and includes a variable gas flow valve for controlling the gas pressure in an analytic trap or the sparge vessel; a sensor that detects both a foaming sample state and a high liquid level in the sparge vessel, using one optical sensor; a control scheme that re-directs the purge gases to a second inlet of the sparge vessel during a foaming condition; a control scheme that uses a split flow to enhance the quantity of sample gases passed from an analytic trap; an electrically powered thermal energy source with a fan raising the sparge vessel temperature via thermal convection.

REFERENCES:
patent: 5337619 (1994-08-01), Hodgins et al.
patent: 5441700 (1995-08-01), Markelov
patent: 5827944 (1998-10-01), Nickerson
patent: 5866072 (1999-02-01), Bowe, Jr. et al.
patent: 5932482 (1999-08-01), Markelov
patent: 6146895 (2000-11-01), Green et al.
patent: 6277649 (2001-08-01), Markelov
patent: 6365107 (2002-04-01), Markelov et al.
patent: 6395229 (2002-05-01), Markelov
patent: 6395560 (2002-05-01), Markelov
patent: 2004/0142481 (2004-07-01), Hartlein

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