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1997
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In the Laboratory
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A Low-Cost and High-Performance Conductivity Meter
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Rogerio T. da Rocha, Ivano G. R. Gutz, and Claudimir L. do Lago
Departamento de Quimica Fundamental, Instituto de Química, Universidade de Sao Paulo, C.P. 26.77, 05599-970 , Sao Paulo - SP, Brazil
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May 1997
Vol. 74 No. 5
p. 572
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| Abstract |
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A two-electrode conductivimeter is described, which keep good performance in spite of its low cost. It is composed of a triangular wave generator, a current-to-voltage converter, and a precision half-wave rectifier. All these functions were implemented with only one integrated circuit TL084. A 3 1/2-digits multimeter is used as the display. Four scales allow measurements over a wide range of conductance (0.01 µS to 19.99 mS). To ensure the low cost and robustness, a stainless steel electrode was developed. The low amplitude and high frequency of the oscillator allow good measurements with this kind of electrode, giving, in some cases, even better results than commercial ones. Anyway, platinum electrode is the better choice for very oxidant media. Electronic diagrams and complete list of components as well as examples of applications are shown.
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| More Information |
 Citation |
da Rocha, Rogerio T. ; Gutz, Ivano G.R. ; do Lago, Claudimir L. J. Chem. Educ. 1997 74 572.
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Keywords |
Analytical Chemistry, Instrumental Methods, Conductivity, Electrochemistry
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History |
Created:
Last Updated: |
July 28, 1999
June 23, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
1997
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572
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