发明名称 |
Thermal isolation system in a chromatograph |
摘要 |
Sample analysis in a portable analytical instrument, preferably in the form of a gas chromatograph, benefits from temperature control of one or more thermal zones in the instrument by way of a thermal isolation system that includes a novel pumping assembly to effect a selective amount of thermal isolation of the thermal zone. The pumping assembly includes a pumping element in the form of a tubular or planar palladium structure. The pumping assembly makes use of the unique properties of palladium to allow selective control of a nominal gas pressure within a vacuum cavity. A component system, which may include a separation column and a thermal device for heating and/or cooling the component system, may be provided within the vacuum cavity. The thermal device and the pumping assembly are individually controlled by a control system. The pumping assembly may be operated to allow selective control of the thermal isolation of the thermal zone; alternatively, the component system may be subject to a controlled temperature by operating the thermal device. A sample mixture passing through the separation column may thereby be exposed to a desired temperature profile according to a selected program so that the sample will separate into its components for subsequent detection by a detector.
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申请公布号 |
US5744696(A) |
申请公布日期 |
1998.04.28 |
申请号 |
US19970814035 |
申请日期 |
1997.03.10 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
WANG, TAK KUI;BAKER, JAMES WARD;BERGER, TERRY A. |
分类号 |
G01N30/54;B01D53/22;B01D69/10;B01D71/02;C01B3/50;G01N30/02;G01N30/30;(IPC1-7):G01N30/30;F25D23/06 |
主分类号 |
G01N30/54 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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