Verfahren zur Probenentnahme unter Verwendung von einem Deckel mit einem spiralenförmigen Gasdurchlass

摘要

A cap for fitting to a sampling device, the cap comprising a sleeve (14) and a cylindrical insert (24). One or other of the opposed surfaces of the sleeve and the insert is formed with at least one helical channel (26) such that, when the insert (24) is fitted into the sleeve (14), the or each helical channel (26) forms a respective passage through which gases may pass into and out of the device.