Dear Dr. Jessica Roberts,
Am Donnerstag, August 31, 2023 02:48 CEST, schrieb "Roberts, Jessica" <jroberts_at_ohio.edu>:
> Hi everyone,
>
> I am in the process of determining the most appropriate cryoprobe to purchase
> and one of the major driving forces is that of the operation/upkeep costs. I
> have a handful of biochemical users, as well as other advanced organic users,
> that would greatly benefit from a LHe cryoprobe and personally that is my preference.
> However, I was curious to see a few things from others that would help navigate this decision:
>
>
> 1. What are the yearly costs related to the upkeep of the LHe cryoprobe? If
> the cost can be broken down to compare between general upkeep and He costs, that
> would be super helpful!
You do not need liquid Helium for this purpose - only a 50 Litre cylinder Helium 6.0 gas.
This cylinder is used for the whole purpose - no Liquid stuff is here needed. This gas
is used to do the cool down the NMR probe - up to 30 Kelvin - with an Helium compressor
and a cold head from Sumitomo. The compressor needs a lot of current and Amperes
(three phases!) also the cryobay by Bruker. This is an extra equipment and there is
also the cold head inside.
The Coldbox has to be serviced - there is a rough vacuum pump inside, a turbo pumpe
and the cold head. After 10.000 hours you have to call the service by Bruker for
replacement and refurbishing some spare parts.
There is a small service and a bigger service in a cycle. These cost a bit
different - but if you but it for more years - its getting a bit cheaper.
If there is no leakage in the high pressure line between the cylinder and the
cryo bay - then you can keep the cylinder for some years.
Also If you don't change the probe too much often in the year!
> 2. I know that is going to depend on usage and operation temperatures,
> etc., but how much LHe do you feel your probe goes through yearly?
> 3. Is there a way to recover the He boil off from the probe? I am in the
> process of installing a He recovery hose to the NMR He stack already, not
> sure how that would work to recover from probe (I apologize if this is a
> silly question).
>
You can not recover the gas lost in this circle. Sorry!
Yours sincerely,
Ulrich Haunz
> Thanks!!!
> Jessica
>
> Dr. Jessica M. Roberts, Ph.D.
> Assistant Professor of Instruction
> NMR Facility Manager
> Department of Chemistry and Biochemistry
> Ohio University
> 245 Chemistry
> Athens, OH 45701
> 740.593.0038
> jroberts_at_ohio.edu<mailto:jroberts_at_ohio.edu>
> --
>
>
>
>
>
>
--
=========================
Ulrich Haunz, Dipl.-Ing. (FH)
NMR-Spektroskopie
Raum L 710, L 807
NMR-Center M520, M521, M527
Postfach M 715
Fachbereich Chemie
Universitaet Konstanz
78457 Konstanz
Tel.: +49 (0)7531 88-4261 -> M521 Bruker Avance NEO 800
Tel.: +49 (0)7531 88-4422 -> L807 JEOL Lambda 400
Tel.: +49 (0)7531 88-4955 -> L710 Bruker AVIII HD 400
Tel.: +49 (0)7531 88-4956 -> M520a Bruker AVIII 600
Tel.: +49 (0)7531 88-4957 -> M527 Bruker AVIII 400 Automation
Tel.: +49 (0)7531 88-4958 -> M520 Bruker AVIII 400 WB
Tel.: +49 (0)170 9153213
FAX : +49 (0)7531 88-3898
=========================
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Received on Fri Sep 01 2023 - 02:31:27 MST