Thanks Ken--did you have to warm up the system to do this?
Thusitha Jayasundera, Ph.D.
Director, Magnetic Resonance Center
Boston College
Merkert 105
2609 Beacon Street
Chestnut Hill MA 02467-3860
Tel: (617) 552-6984 (office)
Fax: (617) 552-2705 <617-552-2705>
On Wed, Jun 7, 2023 at 11:50 AM Kenneth Sharp-Knott <kknott_at_vt.edu> wrote:
> Sure! Ok, As I stated, During the refill of the LN2 dewar for a Prodigy
> probe I noticed that there was cold gas, if not liquid N2, coming out of
> the exhaust heater outlet on the probe - not supposed to happen. And I was
> observing cold gas blowing out of the front of the Prodigy unit. Also not
> supposed to happen.
>
> All of this suggested (I should have realized this on my own) that there
> was a blockage on the outlet port of the LN2 dewar during the refill.
>
> So I carefully removed the clamp from the LN2 dewar and lifted the top to
> expose the attached image. I used a very flexible pipe cleaner brush
> (something similar to the attached image) to probe the outlet tubing and
> indeed found it blocked. I was able to push out the blockage easily, but
> you could also use a heat gun to remove the blockage.
>
> I replaced the top with the clamp and resumed the refill process. No
> further issues.
>
> Best
>
> --
> Ken Sharp-Knott
> Manager of Analytical Services and the NMR Facility
> Department of Chemistry
> Virginia Tech
>
> (540)267-6502 (Cell)
> (540)231-0885 (Office)
>
>
>
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Received on Wed Jun 07 2023 - 09:13:36 MST