Device for sampling and dispensing a predetermined quantity of liquid.

摘要

Device for abstracting and depositing a predetermined measured quantity of liquid; it comprises a pipette consisting of a stem (1) with a hollow end (4), mechanical means holding the hollow end in a filling position or in a depositing position, and mechanical means (3) driving the pipette in rotation about a vertical axis (2); it additionally comprises at least one leakage orifice (21) and an entry or exit chamber (9) for the liquid, oriented approximately radially in relation to the axis of rotation (2) so that a radial pressure gradient prevails in rotation between the entry and at the exit of the conduit. <IMAGE>