Patent ID: 8773149
Filing Date: 2014-07-08
Classification: B01J,C02F,G05D

Abstract:
1. A method for operating a water softening system having an ion exchange device, comprising: an ion exchange resin, a supply vessel for supplying a regenerating solution for regenerating the ion exchange resin, an admixing device, and at least one flow meter, wherein an influent volume flow V(t) wherein the ratio between the first and second partial volume flow in the effluent volume flow V(t) determining the conductivity of the raw water by means of a conductivity sensor, and determining therefrom the total hardness of the raw water using a calibration characteristic stored in an electric control unit, determining the first partial volume flow V(t) deriving a total hardness I of the raw water which is used for controlling the regeneration process of the ion exchange resin from the measured conductivity of the raw water by means of a first calibration characteristic, wherein the first calibration characteristic is used to control the regeneration process, deriving a total hardness II of the raw water used for controlling the admixing device from the measured conductivity of the raw water by means of a second calibration characteristic, wherein the second calibration characteristic is used to control the admixing device, wherein the second calibration characteristic is different from the first calibration characteristic and wherein the total hardness I derived from the first calibration characteristic is at least section-wise larger than the total hardness II derived from the second calibration characteristic.