Ultrapure Water System Conductivity

Electrical conductivity is a measurement indicating the ability of a substance to conduct electric current. It is the reciprocal of the resistivity of the substance, and its unit is S/cm or μS/cm. The conductivity of an aqueous solution depends on the concentration of soluble ions within it. The conductivity of a water sample is an important indicator for measuring the salt content, ionic content, and impurity content of water. At a fixed temperature, the purer the water, the lower its conductivity and the higher its resistivity.

The conductivity of water is closely related to factors such as temperature, ion types, ion mobility, and ion concentration.

Water conductivity measurement methods belong to the total ion screening method. It detects the total trace ion content level and cannot identify specific ions. If specificity is required, atomic absorption or other methods can be used for detection. However, for pure water, such as purified water and water for injection, the lack of ion selectivity in conductivity measurement is not a disadvantage; its highly sensitive characteristics perfectly meet the process analysis requirements for inorganic ion concentration levels in pharmacopoeia-grade water.

Online conductivity detection can provide real-time feedback on the quality of pure water, enabling timely alarms and control actions. Its data can be automatically recorded and traced, ensuring the integrity and authenticity of the sampling and testing data. In addition, online conductivity detection can also eliminate deviations caused by the sampling process and sample transportation.