On our narrow-bore (52) 200MHZ AC (14 years old) we can run experiments at
unlocked field with duration some 2-3 days with no any field drift (there is not
distortions in the lineshape).
There was some increase of the He and N2 boil-off rates, but no noticeable
decrease of the field strenght through these years.
Spectrometer can be like a good building, which communications-interior-roof,
etc. needs repairment (like console), but which walls are lasting for a long
time (magnet) :-)
regards
Vahur
Dwaine Thomas wrote:
> Lazaros--
>
> We are still going strong with our 15-year old VXR-200 magnet which we will
> replace with a higher field magnet this summer. The Helium boil-off is just
> slightly higher than in years past, but the magnet is very stable. It has
> been moved several times and has been given elevator shoes to accommodate
> Bruker probes and a Bruker console, but it just keeps on going. If it
> works, keep it.
>
> good luck.
>
> Dwaine.
>
> ALCON RESEARCH, LTD.
> M/S: R-NMR
> 6201 South Freeway
> Fort Worth, Texas 76134-2099
>
> 817-551-8003
> FAX 817-568-7675
> dwaine.thomas_at_alconlabs.com
>
> -----Original Message-----
> From: Lazaros Kakalis [mailto:kakalis_at_andromeda.rutgers.edu]
> Sent: Tuesday, May 15, 2001 4:03 PM
> To: ammrl Posting
> Subject: Old Magnet
>
> Dear AMMRLers,
>
> We are thinking about replacing our 14-year old VXR-400. One scenario calls
> for replacing the console only while keeping the original widebore Oxford
> magnet.
>
> If we bring down the magnet, change o-rings, seals, gaskets etc refit and
> re-energize can we hope for a long living, healthy spectrometer or are we
> opting for trouble? Are there any major magnet components that need
> replacement?
>
> Please share your thoughts and experiences.
>
> Regards,
>
> Lazaros Kakalis
>
> Rutgers University at Newark
> Department of Chemistry
> 73 Warren Street
> Newark, NJ 07102-1811
>
> Tel: (973) 353-5040 (office, lab)
> Tel: (973) 353-5329 (secretary)
> Fax: (973) 353-1264
> Email: kakalis_at_andromeda.rutgers.edu <mailto:kakalis_at_andromeda.rutgers.edu>
>
>
>
Received on Fri May 18 2001 - 17:16:55 MST