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首页> 外文期刊>Electroanalysis >A Simple Contactless Conductivity Detector Employing a Medium Wave Radio Integrated Circuit for the Signal Treatment
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A Simple Contactless Conductivity Detector Employing a Medium Wave Radio Integrated Circuit for the Signal Treatment

机译：一个简单的非接触式电导检测器，采用中波无线电集成电路进行信号处理

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摘要

A new procedure has been tested for the treatment of the alternating signal coming from a contactless conductivity detection cell. The cell consists of a polyethylene (2 mm o.d., 1.5 mm i.d.) or polytetrafluoroethylene (1.6 mm o.d., 0.8 mm i.d.) tubing, with 5 mm wide tubular electrodes placed over the tubing and separated by a 5 mm gap. An unmodulated or an amplitude-modulated AC voltage is applied to the cell and the AC current passing through the cell is treated by a TDA 1072A integrated circuit, obtaining a signal depending on the conductivity of the quiescent or flowing solution inside the cell. Under optimized conditions, the solution conductance can be measured within a range from ca. 10 to 700 mS cm1, corresponding to ca. 9105 to 5103 M KCl. The detector was used to measure the conductivities of various drinking waters and the values obtained were in a good agreement with those provided by a commercial contact conductometer. It has been found that the use of unmodulated input voltage is advantageous both experimentally, and from the point of view of the quality of the analytical characteristics. The integrated circuit tested is not, however, sufficiently sensitive for application to capillary detection cells with diameters of a few tens of mm, employed in microseparation procedures.
机译：已经测试了一种新程序，用于处理来自非接触式电导率检测单元的交流信号。电解槽由聚乙烯（外径2 mm，1.5 mm内径）或聚四氟乙烯（外径1.6 mm，内径0.8 mm）管组成，在管上放置5 mm宽的管状电极，并以5 mm的间隙隔开。将未经调制或经过幅度调制的交流电压施加到电池上，通过TDA 1072A集成电路处理通过电池的交流电流，从而获得取决于电池内部静态溶液或流动溶液的电导率的信号。在最佳条件下，溶液电导率可以在大约2,000到5,000范围内测量。 10至700 mS cm1，对应于大约9105至5103 M KCl。该检测器用于测量各种饮用水的电导率，所获得的值与商用接触式电导率仪提供的值非常一致。已经发现，在实验上和从分析特性的质量的观点来看，使用未调制的输入电压都是有利的。但是，所测试的集成电路对于应用于微分离程序中直径几十毫米的毛细管检测池的灵敏度不够。

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