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Water hardness is influenced by changes in raw water, flow, pressure and bypass valve. The continuous monitoring of the water hardness behind a blending system with Softcontrol V-UE is therefore of great importance. The device monitors the limit value of the water hardness of blended water on a water softener approx. Every 30 seconds. The limit value can be parameterized in the range between 18 ppm and 360 ppm. The data is shown on the display, saved on the USB stick and output via a 4 to 20 mA current loop. The integrated ion-selective sensor works without the use of an indicator. Installation is simple, the limit value can be parameterized and the sensor, as the only common spare part, reports that it is easy to replace if necessary.