Conductivity Theory Guide

A Guide to On-line Conductivity Measurement

Conductivity and resistivity are widely used parameters for water purity analysis, monitoring of reverse osmosis, cleaning procedures, control of chemical processes and in industrial wastewater. Reliable results for these varied applications depend on choosing the right conductivity/resistivity sensor.

Electrical conductivity has been measured for more than 100 years and it is still an important parameter today. The high reliability, sensitivity, fast response, and relatively low cost of the equipment make conductivity a valuable, easy-to-use tool for quality control. In some applications, the same measurement is made as resistivity which is the inverse of conductivity and with reciprocal units.

This guide provides the basics for a good understanding of conductivity and resistivity determination. Important factors that influence measurements and possible sources of error are discussed. Both theoretical and practical aspects are covered to enable reliable calibration and measurement in various applications.

Recommended videos about conductivity in power plants from the Process Analytics channel:


Our complimentary 48 page guide is a comprehensive reference and training tool based on decades of industry leadership in this measurement.

Topics covered include:

  • What is conductivity?
  • What are the tools for conductivity measurement?
  • How do you select the correct conductivity sensor?
  • What can interfere with conductivity measurements?
  • How do you maintain and store conductivity sensors?
  • What method of conductivity measurement should be used for specialized industries?
  • And more…
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