Design and Construction of Low Cost Electronic Digital lntegrator for Gas Chromatography

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Bibliographic Information

Other Title
  • ガスクロマトグラフ用簡易型ディジタル,インテグレーターの試作

Abstract

A simple digital integrator for gas chromatography was designed, anddetails on the performance and the electrical circuits of the unit are described.<BR>The voltage output, from gas chromatograph was invertedly amplified by 100times using ptA-741 type operational amplifier, then fed into the eharge-balancing type voltage-frequency converter and the output pUlse train was counted by integrated circuits (SN 7490 N) and displayed by 5 digit Nixie tubes.<BR>As valleysenser type peak detector was also attached to the integrator, the display couldbe read from the memory of the integrals of the former peak, after recognition ofthe next peak elution.<BR>On memorizing integrals bf the former one by hand and by means of push button switch operation, the display could be read from the, counter, as pules train was counted.<BR>The circuit diagrams are shown irt Figs.2, 3, 4, and the linearity evaluation data of the voltagefrequency converter areshown in Table 1.<BR>As for the gas chromatographic analysis, the preeision and reproducibility of the individual measurement were good, as shown in Table 2 andthecost of construction of the unit was about 1/20 that of the commercial one.

Journal

  • NIPPON KAGAKU KAISHI

    NIPPON KAGAKU KAISHI 1974 (2), 280-287, 1974-02-10

    The Chemical Society of Japan

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