DETERMINATION OF RAW WATER HARDNESS IN WATER TREATMENT UNIT USING ELECTRIC CONDUCTANCE OF SOFTENED OR MIXED WATER Russian patent published in 2015 - IPC C02F5/00 C02F1/42 B01J47/14 C02F103/04 

FIELD: instrumentation.

SUBSTANCE: inventions can be used during operation of water treatment units for water softening in water supply systems. The water treatment unit (1) comprises a softening device (4) containing ion-exchange resin (7), a conductivity sensor of (9), an electronic actuation device (13) with a memory (18) for implementation of the method of operation of the water treatment unit, automatically adjustable dilution device (11) for mixing the flow of mixed water V(t)_verschnitt from the first, softened partial flow V(t)_teil1weich, and the second, withdrawn from raw water, partial flow V(t)_teil2roh. The conductivity sensor (9) is installed in the area of softened water or mixed water, the conductivity LF_weich of softened water or conductivity LF_verschnitt of mixed water are experimentally determined and the conductivity LF_roh of raw water and/or total hardness of raw water are calculated using the approved formulas.

EFFECT: inventions provide cost-saving and long-term positive control of the water treatment unit.

12 cl, 3 dwg