Dwear Judy
sorry for the late response. ENC is on and it just makes it difficult to
keep up with things.
The thing with the different temperature ranges is relatively easy to
resolve. Time is really the factor that controls it all.
The probe range of -150 to +180 can fully be used. After a while at very
high temperature the probe will start warming up the shimsystem and
eventually reach it; smaximum temperature of 80 C. The the shims will
all shut down. The 0 to 50 range for the flange is becoming critical
when the hot shimsystem now starts affecting the bore. That sually does
not happen for many hours or even days.
The cooling ring is a simple device that allows you to blow down air
along the shim system. This usually keeps it cold enough to keep running
at 130 - 150 C for extended periods of time.
In other words if you only plan to run at over +150 degrees for a short
time (i.e. 2 - 3 hours) you should be ok.
There is a option somewhere in the BSMS tools that allows you to read
the shim temperature ( I thin kit is in BSMStools --> shim system
functions.)
I hope this helps
Clemens
jamburgey wrote:
> Colleagues,
>
> We are setting up some variable temperature experiments, and we're
> trying to determine a reasonable temp range. We have a Bruker AVANCE
> 400 MHz system, for which support advice from Bruker indicates:
>
> "The operating temperature range for both probes should be -150 to 180 C."
>
> "However, there are other limiting factors. The maximum temperature f
> the shim system is 80 C."
>
> "The allowed temperature range for where the magnet bore tube meets the
> magnet flange is 0 to 50 C. With that said you can purchase special
> rings that attach to the magnet flanges that allow you to flow cooling
> /warming air between the shim system and bore tube."
>
> We could play it safe and only use the 0 to 50 C range, but we would
> like to do some higher temp expts (60 C), as well as low temp acquisitions.
>
> Can you all share recommended ranges that you've used with standard
> equipment? I'll post a summary.
>
> Thanks for any help.
>
> Judy
>
>
>
>
> Judith C. Amburgey-Peters
> Associate Professor of Chemistry
> HHMI Undergraduate Award Program Director
> College of Wooster
> Department of Chemistry
> 943 College Mall
> Wooster, OH 44691
> 330-263-2014 voice
> 330-263-2386 fax
>
>
> A keen sense of humor helps us to
> overlook the unbecoming, understand the unconventional,
> tolerate the unpleasant, overcome the unexpected
> and outlast the unbearable.
>
>
--
======================================================================
Clemens Anklin Ph.D. Vice President
Bruker BioSpin NMR Applications & Training
15 Fortune Drive Phone: 978 667 9580 ext 5144
Billerica MA 01821 Fax: 978 667 2955
web: www.bruker-biospin.com e-mail: clemens.anklin_at_bruker-biospin.com
======================================================================
Received on Mon May 01 2006 - 14:47:06 MST