Measuring and testing – Instrument proving or calibrating – Gas or liquid analyzer
Patent
1997-01-09
1998-06-30
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Gas or liquid analyzer
G01N 100
Patent
active
057737070
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: 2238832 (1941-10-01), Zarkowsky et al.
patent: 2284147 (1942-05-01), Herrick
patent: 4865996 (1989-09-01), Castleman et al.
patent: 5100624 (1992-03-01), Dougherty
Rudd Gregory I.
Scheppers Karl H.
Raevis Robert
Seagate Technology Inc.
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