Cationic Exchanger

The application

In production processes in the automobile industry, a wide variety of secondary materials and additives are required. Among others, these include acids for regenerating cationic exchangers in waste water treatment plant. The secondary materials, for example 32-percent hydrochloric acid, are stored in several small storage tanks. Hydrochloric acid is extremely aggressive, and is made even more so by heating to 32 °C. Due to inaccuracies during dilution, the density and composition of the acid used can fluctuate.  For these reasons the choice of materials for parts that come into contact with the tank contents is severely limited.  Even special materials such as Hastelloy are not adequately resistant.

The process data

The solution

The acid is stored in several steel tanks containing 1000 to 2500 litres and up to 3 m high. To resist the aggressive substances they contain, all the containers are enamel-coated. Each storage tank is fitted with a VEGAFLEX 63 level sensor which continuously records the content or signals the refill quantity. These fully insulated sensors operate on the guided microwave principle. The PFA-insulated measurement probe is fully resistant to the medium. The rod probe is mechanically very robust, including against turbulence during filling operations. Level readings are transmitted to the downstream process control system for evaluation. Reliable measurements with the VEGAFLEX 63 enable precise control of filling levels, and so increase process stability. The system ensures optimum use of the available tank volume.

The advantages

	Reliable measurement regardless of density variations
	High process stability due to highest chemical resistance
	Minimum time and costs for installation due to simple commissioning without medium