Sampling apparatus for chromatographic instruments

Details Sampling apparatus for chromatographic instruments Sampling apparatus for chromatographic instruments

1979-04-03

1980-04-29

Swisher, S. Clement

Measuring and testing

Measuring vessel

G01N 110

Patent

active

041999886

ABSTRACT:
Disclosed is a sample feeding apparatus having a housing defining first and second chambers sealed one from the other and a needle movable longitudinally with respect to the housing. The first and second chambers continuously receive carrier and purging gases respectively through suitable conduits. The needle has an opening normally in communication with the second chamber for continuously purging the needle. Upon application of a sample vessel to a member telescopically received about the housing, the needle is displaced through a seal into the first chamber. Carrier gas is thus provided through the needle into the head space of a sample vessel and the sample will flow to the injection block of a gas chromatograph in response to pressure compensation between the injection block and head space. Upon withdrawal of the sample vessel from below the sampling apparatus, the needle is spring returned to its initial position preventing carrier gas from flowing from the first chamber through the needle.

REFERENCES:
patent: 3545279 (1970-12-01), Jentsch et al.
patent: 4000654 (1977-01-01), Harris, Jr.
patent: 4044616 (1977-08-01), Harris, Sr. et al.

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