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Derma Protect + Innovation GmbH
Division Metalworking

Siemensstrasse 6
88048 Friedrichshafen
Germany
Tel.: +49 (0)7541-591224
Fax: +49 (0)7541-591225

ISO 9001 farbe en

Quite simply said, tap water flows into a stainless-steel container containing a mixed bed of special resins, and deionized and demineralizes water flows out.
An ion exchange takes place inside, the higher the charge and the smaller the ionic radius, the more ions are bound to the ion exchange resins.

Ion exchange is the reversible process of replacing desired ions against unwanted ions between a solid and liquid material. In the case of applications for pure or ultrapure water, the solid material usually consists of styrene-divinylbenzene copolymer ion exchange resins and the liquid material is the water.

For example, when the sodium chloride-containing water flows over and through the ion exchange resins, the sodium is exchanged with hydrogen, while chlorides are exchanged with hydroxide ions. Then the hydrogen and hydroxide ions form the water molecule.

Ion exchanger set – Push/Pull

Easy to handle, reliable and environmentally friendly in operation, our devices produce fully demineralized water by means of ion exchange. The scope of delivery includes a conductivity meter, a hose connection set (3x) with quick couplings in the appropriate size as well as a filter cartridge. With this equipment, the process reliability can be guaranteed.

In order to obtain optimum performance parameters from a metalworking fluid of the new generation, a complete demineralization of the feedwater is essential. The desired parameters are, e.g. increased service life, reduced tool and seal wear, cleanliness as well as lime-free operation of the machining unit and the interior surfaces of the machine tool, clear view through its viewing window and prevention of corrosion by salts in the raw water.
There is no need to post-treat dpi coolants to prevent foaming. They could also work without raw water treatment, but they do not reach the maximum performance parameters as with demineralized water. Some corrosion phenomena caused by salting up (chlorides, fluorides, sulfates, phosphates, calcium, etc.) during the life of the solution and increased conductivity cannot be prevented without complete demineralization.

Our range of devices can cover the water requirement from 450 l to 3000 l of ultrapure water per hour. The used filter cartridges are regenerated by dpi Metalworking® in Friedrichshafen, checked and returned to our customers immediately.

Replacement filter – Push/Pull

The replacement cartridge, if one of the ion exchange cartridges is in regeneration. The cartridges are filled with a special mixed-bed resin, checked by the factory and immediately ready for use. Thanks to the push/pull connection technology the ion exchange cartridge can be replaced without tools.

Conductivity meter – standard

Measuring device for monitoring the conductivity (μS) in the raw water intake of the filter unit. The power supply is via a 220V / 50Hz safety plug line and a connection to the ion exchanger via a push / pull quick coupling (or 1 1/4" threaded connection). The device is completely pre-assembled and ready for connection and is checked for function on the factory side.

Conductivity meter with automatic cut-out

Wherever it can not be guaranteed that the existing conductivity indicator on the ion exchange cartridge is monitored and controlled by the operator, it is recommended to install a conductivity meter with an automatic shut-off device. This prevents the ion exchange cartridge from being "overrun", resulting in uncontrolled (salting) and thus corrosion on the machines and their tools.

Conductivity measuring device with automatic shut-off and 3/4 "(WATER-STOP) valve for raw water supply. The power supply is via a 220V / 50Hz safety plug line and a connection to the ion exchanger via a push / pull quick coupling. An interface to a fluid management unit is preinstalled. The device is completely pre-assembled and ready for connection and is checked for function on the factory side.

Regeneration filter cartidge

Replacement of used ion exchange resin, regeneration and factory-side function control. The used filter cartridge must be delivered free of charge to dpi Metalworking® in Friedrichshafen. The exchange is usually done within 1-2 working days.