Device for separating a flowing medium comprising mixture into fractions, throughflow tank and method for manufacturing a plate separator device

A device for separating a flowing medium comprising a mixture into at least two fractions with differing mass density, comprising:

• a plurality of plates disposed substantially parallel to each other, and
• a frame engaging at least substantially round the plurality of plates,
• wherein the plurality of plates disposed substantially parallel to each other are provided with coupling openings, through which coupling openings is inserted at least one elongate coupling member which, in a direction perpendicularly of a longitudinal axis of the elongate coupling member, has an asymmetrical cross-section at positions located between the plurality of plates,
• wherein the elongate coupling member:
• A) is insertable through the coupling openings in an insert rotation position, and
• B) turned around the longitudinal axis relative to the insert rotation position to a distance keeping rotational position that determines the distance between the plurality of plates in fixed manner.