Disclosed is a fraction collector for dispensing liquids into plural receptacles (P1,P2) arranged in a two dimensional array. The fraction collector comprises a table (22) for supporting said receptacles, and an arm supported above the table, in tum supporting a liquid dispenser (35), the fraction collector arm is rotatable about an arm axis (C) and the liquid dispenser is movable along the arm on a carriage 34 (FIG. 2). Thereby, the dispenser is low cost and is repositionable simply above the receptacles as a result of said rotation and as a result of said movement along the arm, without occupying too much laboratory bench space.