Sample container for multisample dynamic headspace sampler

Measuring and testing – Sampler – sample handling – etc. – With constituent separation

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G01N 714

Patent

active

059182890

ABSTRACT:
Method and apparatus for collecting a large number of outgas samples at the same time. Specimens to be tested for outgassing are placed in throw-away widemouth bottles, and the bottles are placed in cups provide in a heating block. A custom made cap is fastened to each bottle using an O-ring. Each cap is provided with an outgassing sample collecting tube. A source of pure gas such as nitrogen or helium is connected by way of a pressure regulator and a hydrocarbon filter to a manifold. Each of the caps on each bottle is coupled to the manifold by way of a metering valve. An adsorbent is placed in each collecting tube. The gas pressure is set to between 10 and 15 psi. The flow through each collecting tube is set to a predetermined level by adjusting its metering valve and measuring the flow at the exit of the collecting tube using a flowmeter. The heating block is heated by means of a thermal tape used in conjunction with a power supply and a thermocouple inserted into a hole in the heating block. The samples are heated and held at an elevated temperature for a predetermined length of time. After the outgassing test is completed, the collecting tubes are desorbed and analyzed with the appropriate instrumentation.

REFERENCES:
patent: 2386832 (1945-10-01), Zaikowsky et al.
patent: 3021034 (1962-02-01), Mack
patent: 3135411 (1964-06-01), Osborne
patent: 3879044 (1975-04-01), Estes
patent: 5100624 (1992-03-01), Dougherty

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