Patent ID: 6883365

Claim:
A focusing device for volatile and semi-volatile organic compounds in the gaseous phase, said focusing device comprising: a) a container consisting of a tubular elements, the central portion of which receives organic compounds to be analyzed; b) a block movable relative to said container; c) a cooling element situated proximate to said container for concentrating said organic compounds, the length of said cooling element being substantially equal to the axial length of said central portion; d) a heating element situated proximate to said container for transferring said organic compounds from said focusing device to a gas analysis system, the length of said heating element being substantially equal to the axial length of said central portion; e) said cooling element and said heating element being secured to two axially separated regions on said block so that there is no thermal interaction between said elements; f) a support structure including spaced first means at opposite sides thereof for supporting the opposite ends of said container; g) said support structure further including second means for supporting said block for movement relative to said container; h) said block movable along said second means for supporting same between two extreme positions; i) said block, in one extreme position, positioning said cooling element in operative relation to said central portion of said container and said heating element in non-operative relation to said central portion; and j) said block, in its other extreme position, positioning said heating element in operative relation to said central portion of said container and said cooling element in non-operative relation to said central portion.