SHUTTLE ASSEMBLY FOR 2FNMR

A shuttle assembly (14) adapted for operation in a transfer device for shuttling an NMR sample container (12) between at least two coaxially arranged NMR magnet systems (11'; 11") of an NMR spectrometer (10), the transfer device comprising a guide tube (13) configured to be positioned in a central bore of the coaxial magnet systems, the shuttle assembly being arranged inside the guide tube for securely holding and shuttling the NMR sample container and a drive system such that the shuttle assembly can travel inside the guide tube between the coaxial magnet systems, wherein the sample container is mounted to the shuttle assembly in an operational state of the spectrometer, is characterized in that the shuttle assembly comprises a piston design being moveable along the common axis of the coaxial magnet systems under the influence of gas pressure generated by a pneumatic pressurizing arrangement being part of the transfer device. This compact mechanism can easily be integrated into an NMR spectrometer and is able to move the sample container precisely within milliseconds at high speed without negatively affecting the measurement by shocks, vibrations, heat input or contamination by foreign objects.