The present invention relates to a device (20) for collecting dialysate samples (42). The device (20) comprises an inlet (22) for receiving a flow of dialysate, a plurality of outlets (24) for providing a flow of saturated dialysate and means (26) for sequential selection of one of the outlets (24). The sequential selection means (26) are activated only by the flow of dialysate received from the inlet (22). The present invention further relates to a system for peritoneal dialysis comprising such device (20).