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Forbidden indicators in flow measurement using the saline dilution method

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Abstract

When using the saline conductivity method for measuring flow, the concentration of the indicator (saline), with respect to the resistivity of the flowing fluid (e.g. blood), is an important consideration. Indicators with resistivities that are close to the resistivity of the flowing fluid yield incorrect flow measurements. This ‘forbidden indicator’ is one that has the same resistivity as the flowing fluid, and yields an infinite value for flow. Indicators having greater than ten times, or less than one tenth of, the resistivity of the flowing stream should be used to obtain accuracy.

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Authors and Affiliations

  1. Biomedical Engineering Centre, Purdue University, 47907, West Lafayette, IN, USA

    D. S. Worley & L. A. Geddes

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  1. D. S. Worley
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  2. L. A. Geddes
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Worley, D.S., Geddes, L.A. Forbidden indicators in flow measurement using the saline dilution method. Med. Biol. Eng. Comput. 20, 745–748 (1982). https://doi.org/10.1007/BF02442530

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  • DOI: https://doi.org/10.1007/BF02442530

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