Measurements of the electrical conductivity of water

Author

Jones, R.G.

Author_Institution

Nat. Phys. Lab., Teddington, UK

Volume

149

Issue

6

fYear

2002

Firstpage

320

Lastpage

322

Abstract

The electrical conductivity of water is used in many industries as an indication of the purity of the water. A system for the traceable measurement of the conductivity of water in the range 0.01 S/m to 1 S/m is described. The method is based on the measurement of the resistance of a column of water of accurately known dimensions. There is an electrode polarisation effect and the convention is to extrapolate the conductivity as a function of inverse frequency to find the value at zero inverse frequency. The temperature coefficient of the conductivity is 2% per Kelvin at 25°C and this limits the uncertainty of the measurement to about ±0.14% of value in the present system.

Keywords

calibration; electric resistance measurement; electrical conductivity measurement; electrodes; extrapolation; measurement standards; measurement uncertainty; polarisation; temperature control; water; 25 C; accurately known dimension water column; conductivity meter calibration applications; conductivity range; electrode polarisation effect; inverse frequency conductivity extrapolation; measurement uncertainty limits; temperature coefficient; traceable water electrical conductivity measurement; water column resistance measurement; water purity indicator; zero inverse frequency value;

fLanguage

English

Journal_Title

Science, Measurement and Technology, IEE Proceedings -

Publisher

iet

ISSN

1350-2344

Type

jour

DOI

10.1049/ip-smt:20020767

Filename

1176538