Measuring and testing – Measuring vessel
Patent
1977-04-25
1979-01-16
Woodiel, Donald O.
Measuring and testing
Measuring vessel
128 2F, G01N 114
Patent
active
041343000
ABSTRACT:
A method and apparatus are provided for reducing the pressure in and then collecting medium samples in containers such as test tubes sealed by a resilient stopper at substantially atmospheric pressure, comprising piercing the stopper at or shortly before the time of collection of a medium sample by a first cannula, connected at one end to a pressure-reducing device, thereby connecting the interior of the container with the pressure-reducing device via the first cannula; evacuating the container to a desired subatmospheric pressure; withdrawing the first cannula; penetrating the stopper by a second cannula connected at one end to a medium source to be sampled, thereby connecting the source with the interior of the container via the second cannula; and then sucking a sample of medium into the container under the influence of the subatmospheric pressure effected in the interior of the container by the pressure reduction.
REFERENCES:
patent: 3433216 (1969-03-01), Mattson
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