Bruker Switzerland Ag

Daniel Knecht

Roger Meister

Markus Mayer

An NMR spectrometer () with a permanent magnet device () with measurement volume () and bore () for inserting an NMR measurement sample contained in a sample tube (), and with an RF coil () outside a cylindrical temperature control pipe () with a continuous annular air gap () through which temperature control gas can be conducted through a gas inlet (), is characterized in that on the end opposite the gas inlet, a movable holding device () is installed which, in a first operating position, does not touch the sample tube, in a second operating position, holds the sample tube in its measuring position at its outer circumference in a force-fitting and/or form-fitting manner with an axially acting force or static friction F, and, in a third operating position, releases the sample tube for removal, and that in the second operating position F>F−F, where Fis the buoyancy force generated by the dynamic pressure of the temperature control gas flowing onto the sample tube and Fis the weight force of the sample tube. This enables the problems of known arrangements of the type in question with the dynamic pressure caused by the temperature control gas to be avoided.

Growing community of inventors

Volketswil, Switzerland

Daniel Knecht