The new Model 410VP four-electrode conductivity sensor has a wide dynamic range (1 uS/cm to 1400 mS/cm), making it ideal for clean-in-place (CIP) monitoring. It is the first single four-electrode sensor that does complete CIP conductivity measurement, resulting in lower initial cost and reduced maintenance and training requirements. It is also used to monitor the conductivity of eluents in chromatographic separations and to detect liquid interfaces.