Chinese Journal of Tissue Engineering Research ›› 2012, Vol. 16 ›› Issue (21): 3924-3928.doi: 10.3969/j.issn.1673-8225.2012.21.029

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Design and experiment on the dialysate pH value and electrical conductivity measuring instrument 

Liu Zhi-bin, Song Wen-xiao, Yang Jing-juan, Zhu Yi-heng, Lu Guang-wen   

  1. School of Biomedical Engineering, Southern Medical University, Guangzhou  510515, Guangdong Province, China
  • Received:2012-01-16 Revised:2012-02-22 Online:2012-05-20 Published:2012-05-20
  • Contact: Lu Guang-wen, Professor, Master’s supervisor, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, Guangdong Province, China gwlu@fimmu.com
  • About author:Liu Zhi-bin★, Studying for master’s degree, School of Biomedical Engineering, Southern Medical University, Guangzhou 510515, Guangdong Province, China lzbin2008@sina.com
  • Supported by:

     Key Projects for Science and Technology Development with integration of Production, Education and Research, Guangdong Province and Ministry of Education, No. 2010A090200003*; Special Fund of Zhuhai City for Science and Technology Development with integration of Production, Education and Research in 2010, No. 2010A0501006*

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Abstract:

BACKGROUND: The dialysate concentration directly determines the efficacy of dialysis during the process of hemodialysis.
OBJECTIVE: To design a measuring instrument of dialysate pH value and electrical conductivity and to test the performance of the measuring instrument through experiments.
METHODS: The variable frequency of bipolar interim pulse method was put forward to reduce polarization and capacitance effect on the conductivity measurement tremendously while simultaneously temperature compensation was selected for electrical conductivity. Two-point correction method was used for calibration test to improve the accuracy measurement of pH value.
RESULTS AND CONCLUSION: The trial manufactured carried experiment on the actual dialysate. The relative error between the calibration result and the accurate value for dialysate pH value was less than 1% and that of electrical conductivity was less than 0.5%. Besides, comparative experiments between variable frequency of bipolar interim exciting pulse and bipolar exciting pulse were carried out. The former was less measure error and could follow up the response closely. The results show that the measuring instrument can realize the accurate measurement and be widely used in hemodialysis machine.

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