Sorbent tube trace sample releasing apparatus

Details Sorbent tube trace sample releasing apparatus Sorbent tube trace sample releasing apparatus

1989-07-07

1990-01-02

Raevis, Robert R.

Measuring and testing

Sampler, sample handling, etc.

Analyzer supplier

G01N 3500

Patent

active

048905020

ABSTRACT:
A sorbent tube trace sample releasing apparatus comprises a tubular casing for connection at a downstream end to, say, a gas chromatograph, a spring loaded valve in the bore of the casing, a valved, purging gas inlet downstream of the spring loaded valve and a sorbent tube receiving end portion upstream thereof, surrounded by a heating coil, and fitted with an O-ring seal adjacent an upstream side of the spring loaded valve. The tubular casing is connected to a sample entry of a gas chromatograph and purging gas is fed to the gas chromatograph. The purged casing is then heated by heating coil with a sample carrying sorbent tube inserted in with the casing, spring loaded valve and sample carrying end of the sorbent tube heated, the sorbent tube is then used to open the spring loaded valve while a carrier gas is fed along the sorbent tube to release the sample. When the trace sample has been released, purging gas is fed through the purging gas inlet with the spring loaded valve closed because substantially only a portion of the casing interior needs to be purged.

REFERENCES:
patent: 3205711 (1965-09-01), Harris
patent: 3566698 (1971-03-01), Sheppard
patent: 3735640 (1973-05-01), Chizov et al.
patent: 4148315 (1979-04-01), Berezkin et al.
patent: 4269608 (1981-05-01), Sisti et al.
patent: 4294117 (1981-10-01), Buser et al.
patent: 4414857 (1983-11-01), Brazhnikov et al.
patent: 4612019 (1986-09-01), Langhorst

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