The modern four-electrode conductivity cell contains two drive electrodes and two sensing electrodes. The sensing electrodes are positioned in a low-current area so that electrode fouling is minimized. An alternating current is used to drive the cell. This reduces errors caused by polarization resulting from the application of a direct current.

Two conductivity sensors are available, optimized for performance in different areas of the conductivity range.

Low-range sensor: 5 to 20,000 μS/cm ±0.5% or 2 μS/cm
High-range sensor: 150 to 112,000 μS/cm ±0.5% or 2 μS/cm