Determination of a conversion factor relating the conductivity and the hardness of water

摘要

Method and apparatus for determining the hardness of water. Water is separated into two portions. One portion is treated in an ion exchanger while the other portion bypasses the treatment unit. Both portions are mixed together again to obtain water of defined hardness. The conductivity of the water for different blending ratios is determined and the change of conductivity with the blending ratio is used to determine a conversion factor for the conversion of conductivity values into hardness values.