>> Bruker (Sweden) however tells us that the helium container must be at the
>> same level as the 800 MHz magnet. Is this correct?
>>
>
>We have installed a Bruker 600er (Shielded) just 6 months ago.
>The magnet is located in a hole (60 cm deep).
>
>We (and the BRUKER engeneer, too) fill definitly with helium/nitrogen
>vessels on normal base (outside of the hole)
>This question never arose.
>
>by the way: put the magnet not in the middle of the whole, because you
>can never reach the magnet top (for filling or changing the sample) from
>outside the hole (or you must use a large letter within the hole, or
>same temporary board walks, wodden made).
>
>
>Matthias Findeisen
>Universität Leipzig, Inst. of Analytical Chemisty
>D-04103 Leipzig, Linnéstr.3
>(Germany)
>
>Tel +49-341-9736053 /055 / 050
-----------------------------------------
>Dear Mr. Rise!
>
> First of all I am sorry for the misleading information You obviously
>received
>from Bruker personnel.
>
> There is no problem to fill any magnet with helium from a reservoir
>being 2-3m
>higher than the magnet. The standard transferline delivered with an 800
>MHz system
>is fully sufficient for this case. But let me take the opportunity to
>bring a few
>related problems to Your attention:
>
> - There must be an area (preferably close to the magnet) where You can
>insert the
> transferline into the supply vessel. This area could be small (~0.5 x
>1.0m) but
> the ceiling has to be approx. 3.5 - 3.7m above the regular floor level.
>Pls
> contact Your local helium supplier and ask him for the height of the
>entry port
> of his highest 250l vessel. Take his answer and add 1.70m for the
>transferline
> to find out Your minimum requirements.
>
> - Filling nitrogen out of a movable vessel from that hight is still no
>problem.
> Only if You should plan a fixed installation with a reservoir higher
>than the
> regular floor level, the pressure increase due to the hight difference
>must be
> considered.
>
> - Pls plan the pit for the magnet large enough to accommodate the cooling
>unit
> on the lower level 3.5 - 4.0m from the centre of the magnet. It would not
> last very long in fields >40 gauss.
>
>If You should have further questions, pls do not hesitate to contact us
>directly
>in Karlsruhe, as almost all 800 site planning is done from here. You could
>either
>address me, but as I am a service engineer installing those systems I
>could be on
>the road for longer periods, then the boss of the magnet producton
>
> Dr. G. Roth (e-mail: ro@bruker.de) would be the right person, or
>
> Karina Unting (e-mail: ut@bruker.de), Dr. Keller's secretary, could
>give You
>
>some general information or forward Your requests.
>
>Best regards
>
> Ralf Ruin
>--
>
>==================================================================
>
> ... ... Ralf Ruin
> . * . . NMR Service Department
> . . . . Bruker Analytische Messtechnik GmbH
> B R U K E R D-76287 Rheinstetten Germany
> . . . . Voice: +49 721-5161-147
> . * . . Fax: +49 721-5161-297
> ... ... E-mail: rr@bruker.de
>
>==================================================================
----------------------------------------------------
Frode Rise
Department of Chemistry
University of Oslo
P.O. Box 1033 Blindern
N-0315 Oslo
Norway
Voice: (+) 47 224 60741, (+) 47 224 61476, (+) 47 228 55514
Fax: (+) 47 228 55514
http://www.uio.no/~froderi/nmr/engelsk/