Hello Ken,
It should not take two hours after a regular fill for the system to be
operational again. There is definitely some kind of problem.
I have never seen that error pop-up message. It does suggest that there
is a leak, but it could be a red herring.
I have a few questions:
Do you see any condensation or other signs of cold spots on the nitrogen
transfer line going from the Dewar to the Prodigy?
Have you seen an increased rate of liquid nitrogen consumption?
Can you bring up the "logs" from the past several weeks? Have a look at
the operating temperature - but check other parameters as well,
especially last night when the long carbon experiments were running?
The fact that they were long carbon experiments shouldn't be a problem.
I'd be more concerned about long HSQC experiments with 13C-decoupling.
Good luck.
Bob.
On 2024-10-15 11:36 a.m., Kenneth Sharp-Knott via groups.io wrote:
>
> Has anyone ran across this error on their Prodigy instruments?
>
> I've had several people say they ran long carbons last night and had
> little to no signal. There did appear to be more Receiver Overflow
> errors than usual.
>
> The probe is still cold and a quick 16 scan carbon this morning shows
> strong signal.
>
> E2321: Rapid Buffer Vacuum Decay. Pumping Non-Stop.
>
> On a related note: We have had issues cooling down after refills for
> the last several months. Tightening the screws at the Fill and
> Exhaust ports on the Prodigy Dewar neck seemed to help, but the last
> time took almost two hours to go back to cool. Bruker suggests a
> leak, but I'm not sure where it is.
>
> Ken Sharp-Knott
> Manager of Analytical Services and the NMR Facility
> Department of Chemistry
> Virginia Tech
>
> (540)267-6502 (Cell)
> (540)231-0885 (Office)
>
--
Dr. Bob Berno
Manager, NMR Facility
McMaster University, ABB-156
1280 Main St. West
Hamilton, ON L8S 4M1
T: 905-525-9140 x24158 or x24686
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