The water flows into a transparent tank containing an agitator. A sensor allows measuring the conductivity of the water. It is displayed on a meter and transmitted as an electrical signal to a controller. The desired conductivity is preset as the reference variable in the controller. The controller influences the conductivity of the water by adding diluted caustic soda with a metering pump. The addition of caustic soda causes the pH value of the water to increase. It flows into a second transparent tank. A sensor provides measurement of the pH value. The desired pH value is set as a reference variable in the controller. The water is neutralized by adding diluted sulfuric acid with a metering pump. Another sensor in this tank is used to measure the oxygen concentration of the water. It is displayed on a meter and transmitted as an electrical signal to the controller. The controller influences the injection of compressed air, and therefore the oxygen concentration of the water, by means of a control valve. The water flows into a collection tank.

Code: RT 586