In a Wenner 4-pin configuration, how is the connection made to the pipe?

In a Wenner 4-pin configuration, the connection to the pipe is made perpendicularly. This configuration is designed to provide accurate measurements of soil resistivity around buried structures, such as pipelines. The perpendicular arrangement of the pins allows for a uniform current distribution and minimizes the potential gradient between the measurement electrodes.

In this setup, two outer pins are used to inject a current into the ground, while the two inner pins measure the resulting potential (voltage) caused by that current flow. The perpendicular orientation helps to ensure that the measurements reflect the resistivity of the soil surrounding the pipe rather than being influenced by stray currents or variations in the current path due to uneven soil composition.

Understanding this specific deployment method is crucial for obtaining reliable and consistent measurements in cathodic protection testing and soil resistivity assessments, which are essential for evaluating the effectiveness of corrosion control measures on pipelines and other metallic infrastructures.