Pneumatic transport system

A conveying system for conveying samples, including at least one elongated item for holding the samples, a tube system having at least one tube connection with an internal cross-sectional dimension, at least one dispatch station for dispatching the at least one elongated item into a path, at least one receiver station for receiving the at least one elongated item dispatched into said path, and an air conveying device which is positioned for producing an airflow in the tube connection in a direction along said path from the dispatch station to to the at least one receiver station, where the inner cross-sectional area of the tube connection is of a size greater than the largest cross-sectional area of the at least one elongated item to be conveyed along said path measured transversely of the longitudinal direction of the item, and which is provided with at least twice the cross-sectional area compared with the largest cross-sectional area of the item, where the items have a length which is greater than the largest inner cross-sectional dimension, where the air conveying device includes at least one connection for supplying pressurized air to the at least one dispatch station, wherein said air conveying device also includes at least one connection for supplying pressurized air to a bypass duct, said bypass duct being configured and arranged extending around the at least one dispatch station from an upstream to a downstream side thereof for enabling a constant airflow to be conducted around the at least one dispatch station into said path by which items already underway along said path in the tube system remain moving during dispatching of an item into said path.