814130 · 1995-09-15 — The tariff classification of a Cryostream Cooler System from England.
The Cryostream is a nitrogen gas flow cooler designed specifically for crystallographic applications. An open Dewar is used and liquid nitrogen is sucked out by an external pump through a vacuum jacketed flexible metal tube into the Cryostream coldhead. Here the liquid is vapourized and the resulting gas exits, passes through the pump and a flow controller, finally returning to the cryostream. The now warm nitrogen gas then flows through a heat exchanger whence it is recooled by the incoming liquid. This cold gas subsequently passes through a nozzle onto the crystal sample. Within the nozzle…