Device feeding liquid samples.

Feeding device (10) for liquid samples with an immersion container (20) in wastewater, a feed pump (16) and a feed duct (18) between the immersion container (20) and analysis equipment (28) arranged on the ground, characterized in that the feed pump (16) feeds pulsed mode and in that the feed pump (16) and the supply line (18) are configured such that the expansion volume of the conduit feeding (18) during the supply pulse is at most 50% of the pulse volume.