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    • 10. 发明公开
    • A THERMAL CONDUCTIVITY DETECTOR
    • WÄRMELEITFÄHIGKEITSDETEKTOR
    • EP3132260A1
    • 2017-02-22
    • EP15716043.3
    • 2015-04-13
    • Siemens Aktiengesellschaft
    • GELLERT, Udo
    • G01N30/66G01N27/18G01N30/62G01F1/68
    • G01N30/66B01L3/5027B01L2300/0663B01L2300/1827G01F1/7084G01N27/18G01N27/185G01N30/62G01N2030/025G01N2030/621G01N2030/625
    • The invention relates to a thermal conductivity detector (5) comprising: - a measurement channel (6), - an electrically heatable heating filament (7) extending longitudinally along the center of the measurement channel (6) so that a fluid (23) passing through the measurement channel (6) flows around the filament (7), - evaluation means (8) for detecting electrical resistance changes of the heating filament (7) and providing an output (9) representative of the presence and amount of various fluid components passing the heating filament (7), and - a bypass channel (13) for bypassing the measurement channel (6), said bypass channel (13) having a lower fluidic resistance than the measurement channel (6). To improve the detection capability, the thermal conductivity detector (5) further comprises: - a flow sensor (24) for measuring the flow of the fluid in the bypass channel (13) and providing an output (37) indicative of the measured flow, and - correcting means (38) for correcting the output (9) of the evaluation means (8) using the output (37) of the flow sensor (24 ).
    • 本发明涉及一种热导率检测器(5),其包括测量通道(6),设置在其中的可电加热丝(7),使得通过测量通道(6)的流体(23)围绕灯丝(7)流动 )和用于检测加热丝(7)的电阻变化的评估装置(8),并提供表示通过加热丝(7)的各种流体成分的存在和量的输出(9)。 为了提高检测能力,特别是当用于具有包装或PLOT色谱柱的气相色谱仪时,热导检测器(5)还包括用于绕过测量通道(6)的永久旁路通道(13),旁路通道(13)具有 比测量通道(6)更低的流体阻力。 优选地,提供流量传感器(24),用于感测旁路通道(13)中的流体的流动,并用感测的流量校正评估装置(8)的输出(9)。