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Estimation of the error due to radial displacements in a conductivity cell (jones type)

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Abstract

The paper presents the results of a study of errors arising in the presence of radial displacements in a conductometric differential cell with a removable central part, in the process of measuring the electrolytic conductivity of solutions. The analysis of the component of the measurement error of the cell resistance, caused by the presence of displacement at the cell joint, as a systematic error is carried out. This error is caused by the appearance of additional resistance of the solution column in the cell due to a decrease in the cross-sectional area at the joint with a radial displacement and a corresponding change in the path of electric current flow in the cell. This additional resistance is estimated using computer cell modeling and finite element method. To describe the joint of the displaced cell parts, the parameter KJ is used, which depends on the diameter of the tubes and the magnitude of the displacement. Expressions for the errors and dependences for KJ are obtained, with the help of which it is possible to estimate the component of the error in measuring the resistance for real cells due to radial displacements. The results of the work can be used to estimate the component of the measurement error of electrolytic conductivity due to the presence of radial displacements of a known value for real cells. This will make it possible to ascertain whether or not this source of error should be taken into account when estimation the measurement uncertainty of electrolytic conductivity with the known characteristics of the cell fixing devices.

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  1. Institute of Electrodynamics, National Academy of Science of Ukraine, Pr. Peremohy, 56, Kyiv, 03057, Ukraine

    D. V. Meleshchuk

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  1. D. V. Meleshchuk
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Correspondence to D. V. Meleshchuk.

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Meleshchuk, D.V. Estimation of the error due to radial displacements in a conductivity cell (jones type). Accred Qual Assur 26, 211–215 (2021). https://doi.org/10.1007/s00769-021-01477-5

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  • DOI: https://doi.org/10.1007/s00769-021-01477-5

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