METHOD AND DEVICE FOR BALANCING LIQUIDS

摘要

The invention relates to a method for balancing the amount of two liquids and a disposable based thereon for balanced conveyance of a filtrate and a substituent for a medical treatment device, consisting of two volumetric conveying units (roller pumps), which are alternately crossflown by the media to be balanced in a time symmetrical manner by means of appropriate control elements. The cyclic time symmetry makes it possible to totally eliminate all flow differences in both conduits in the sum. Both conveyed amounts are equal. In order to supress systematic errors, the pressure in the inlets and outlets of the volumetric conveying units is kept constant. A special switching regime Umschaltregime (mirror method) makes it possible to also eliminate time parameter changes in pump output as a balance error.