Know the Application of Half Cell Instrument

Half-cell instruments are crucial for the inspection of corrosion in concrete structures. Corrosion inspection is important to determine and evaluate the quality of steel within structures. It is a key task in ensuring proper corrosion control and the integrity of a structure. Laboratory evaluations and field data are occasionally obtained to make sure that information is up-to-date and to help the management make informed decisions on what they can do to slow down the corrosion process or to predict how long the structure can last before it gives its way. Using half-cell instruments can reduce the time it takes to accomplish the inspection.

The half-cell potential metre is one of the types of half-cell instruments that can test reinforcement steel, with the ability to analyse corrosion. Thus, it is considered one of the most advanced and comprehensive instruments for corrosion analysis. Reputable manufacturers have designed the half-cell potential metre to be durable, with a robust housing that can withstand the harshest testing environments. Hence, you can perform on-site testing without worrying about dust, moisture, heat, humidity, vibrations, and other environmental factors affecting the instrument.

Using the half-cell method, you can identify active corrosion of rebars according to the electro chemical properties of the reinforced concrete. Electrodes (wheel or rod) are based on a Cu/CuSO4 (copper/copper sulphate) half-cell. However, you have the option to use other reference electrodes, and that is why some advanced half-cell instruments offer a range of input options for other electrodes, like saturated calomel and silver/silver chloride. A standard cable is provided with the rod electrode and it can easily connect to almost all third party rod electrodes.


Technicians may use the electrical potentials technique to assess the likely regions of corrosion in the reinforcement steel. Copper sulphate half-cell is held against the surface of the concrete, a connection made to exposed rebar. A voltmeter measures the voltage difference, and the reference half-cell moves from one point to another across the surface. The half-cell instrument can perform a complete corrosion scan and provide statistical data on the results.

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