What is Conductivity?

In chemistry, Conductivity is a fundamental measurement of the dissolved acids, bases, salts, and other dissolved solids in a liquid solution. Electrical conductivity is a good indication of the purity (or lack thereof) of the liquid. Conductivity probes are frequently deployed for assessing pure water quality to determine the presence of contaminants.

Conductivity is also a valuable tool for gauging acid or base concentration. The relationship between the concentration of an added acid or base to pure water is graphically represented by a conductivity-versus-concentration curve. Such measurements are crucial in formulating solutions like NaOH for clean-in-place applications.

Selection Help

2 pole conductivity probe

2-Pole Conductivity Probes

Ultrapure water to mid-range conductivity applications with clean liquids where corrosion or build-up is not a concern.
4-pole conductivity sensors

4-Pole Conductivity Probes

Designed for wide range of conductivity measurements found in chromatography, filtration, and chemical blending applications. 
Arc Module Cond-P SU for conductivity sensors

Single-Use Conductivity

Hamilton's single-use conductivity monitoring system comprises the reusable Arc Module and a single-use sensor patch.

What is a Conductivity Sensor?

A conductivity sensor, or conductivity probe, is often used to detect the ion concentration of a liquid solution. This includes testing water purity, the concentration of an acid or base, or whether a liquid contains contaminants. There are two types of conductivity probes, contacting and inductive, that each have their ideal use cases and measurement ranges.

Which conductivity probe style is right for me?

Selecting a conductivity probe is highly dependent on the application and measurement range. There are two main technologies currently available to choose from for conductivity sensors.

Conductivity Probe Technology Ranges Chart


Hamilton's knowledge base provides a range of explanatory articles, frequently asked questions, and document downloads.
  • Catalog - Process Analytics

    Download the Process Analytics sensor catalog to learn about the complete offering of Hamilton process sensors and accessories.
  • Brochure - BioPharma

    Innovative solutions for process analytics in biotechnological and pharmaceutical industries.
  • Flyer - Conducell UPW

    Overview of the features of the conductivity sensor Conducell UPW for Ultra pure water applications.
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