Abstract
The object of study is a differential two-electrode conductivity cell with a calculated constant, designed for the practical realization of the unit of length – a meter in national measurement standards of electrolytic conductivity of liquids. The differential cell consists of two tubes of the same diameter but different lengths. The article presents an idealized model for calculating cell constants and determining electrolytic conductivity. The presence of holes for filling the cell, caus-ing a distortion of the uniformity of the current density distribution in the middle of the cell, and a significant dielectric permeability of aqueous solutions lead to significant errors when measuring the resistance of liquid columns. The arti-cle presents mathematical expressions for calculating two types of corrections. First, the correction caused by the dis-tortion of the field uniformity due to the presence of the inlet and outlet holes of the cell. Secondly, the correction caused by the presence of bias currents in aqueous solutions of electrolytes. The appearance of a differential cell based on two tubes with a diameter of 9 mm and a length of 50 and 100 mm, respectively, which is being tested as a part of the national measurement standard of Ukraine, is given. References 7, figures 5, tables 2.
Publisher
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
Subject
Electrical and Electronic Engineering,Energy Engineering and Power Technology
Reference7 articles.
1. 1. Wu Y.C., Koch W.F., Pratt K.W. Proposed New Electrolytic Conductivity Primary Standards for KCl Solu-tions. J. Res. Natl. Inst. Stand. Technol. 1991. Vol. 96. Pp. 191-201.
2. 2. Brinkmann F., N. Ebbe Dam, Deák E., Durbiano F., Ferrara E., Fükö J., Jensen H.D., Máriássy M., Shreiner R.H., Spitzer P., Sudmeier U., Surdu M., Vyskočil L. General paper: Primary methods for the measurement of electro-lytic conductivity. Accred Qual Assur. 2003. No 8. Pp. 346-353. DOI: https://doi.org/10.1007/s00769-003-0645-5
3. 3. Asakai T., Maksimov I., Onuma S., Suzuki T., Miura T., Hioki A. New Japanese certified reference materials for electrolytic conductivity measurements. Accreditation and Quality Assurance. 2017. Vol. 22(2). Pp. 73-81. DOI: https://doi.org/10.1007/s00769-017-1253-0
4. 4. Ovchinnikov Yu.A., Suvorov V.I., Levtsov V.I. State Primary Standard and State Verification Scheme for Instru-ments for Measuring the Electrical Conductivity of Liquids. Measure technique. 2000. No. 9. P. 18. (Rus)
5. 5. Jensen H.D. Final Report of Key Comparison CCQM-K36. Metrologia. 2010. No 47(1A):8025-08025. DOI: https://doi.org/10.1088/0026-1394/47/1A/08025