Automated system for the performance of potentiometric titrations on acids and bases. Up to 100 samples can be placed on the sample rack. The sample is pipetted out of the beaker into the external titration vessel, after which a completely automatic determination is carried out. The volume to be pipetted can vary between 0.5 and 9.0 mL. After the titration, the external vessel is cleaned thoroughly using the membrane pumps built into the Sample Processor. The control of this completely automatic analysis system takes place using the proven OMNIS software.