Chromatographic column system

Chromatographic column system comprising:

• a column connected to a fluid inlet and a fluid outlet and dimensioned to comprise an expandable filter bed between said fluid inlet and said fluid outlet;
• a top collector provided in said column adapted for collecting substance filtered by said filter bed;
• top collector actuator;
• a top stratum position detector is constructed and adapted to detect a top stratum position of the filter bed when in expanded state;
• and
• a controller is provided communicatively coupled to said top stratum position detector and said top collector actuator, for moving the top collector as a function of a detected top stratum position, characterized in that
• said top collector actuator and said top stratum position detector are provided as a single top collector actuator piece that is translatable along said column and, the collector actuator being arranged external of said column for axial actuation of the collector piece;
• the collector actuator comprising a magnetic element;
• and wherein said collector piece comprises a complementary magnetic element so as to be magnetically coupled to said collector actuator.