Transport apparatus for temperature-controlled nmr test samples having a double tube system

Transport apparatus for pneumatically conveying a nuclear magnetic resonance (NMR) test sample having an outer diameter Dr from and/or to a region outside an NMR spectrometer into and/or out of the NMR spectrometer, comprising:

• a tubular transport channel configured to convey the test sample,
• a device producing positive pressure in an end of the tubular transport channel that is remote from the NMR spectrometer,
• wherein the tubular transport channel comprises a tube system which comprises
• a gas-tight outer tube having an outer diameter Da and an inner diameter da and
• an inner tube, arranged coaxially with respect to the outer tube, having an outer diameter Di<da and an inner diameter di, wherein the inner diameter di of the inner tube is greater than or equal to the outer diameter DP of the NMR test sample, and
• wherein the inner tube comprises cross-holes that are mutually spaced in an axial direction of the inner tube and are configured as through-holes.