Date: Thu, 31 Jul 2025 14:18:39 -0500
Replying to Bob:
Different transfer lines have different fittings. The tool I posted is for
the type of transfer line pictured below. For the ones with the KF fitting,
you can just remove the nut and clamp on to a vacuum line.
_____________________________________
Todd Rappe
Minnesota NMR Center <nmr.umn.edu>
612-625-9147 (office)
651-321-TODD (rings office and mobile)
612-624-8892 (magnet lab)
On Thu, Jul 31, 2025 at 1:38 PM Bob Berno via groups.io wrote:
> Hmm.
> I'm not sure that's the tool you mean.
> That looks like the valve you connect to the magnet vacuum port, either
> when you are installing the magnet, or if you have de-energized the magnet
> and want to break vacuum.
>
> On 2025-07-31 1:32 p.m., Todd Rappe via groups.io wrote:
>
>
> _____________________________________
> Todd Rappe
> Minnesota NMR Center <nmr.umn.edu>
> 612-625-9147 (office)
> 651-321-TODD (rings office and mobile)
> 612-624-8892 (magnet lab)
>
>
> On Thu, Jul 31, 2025 at 12:25 PM Alvaro Herrera via groups.io wrote:
>
>>
>> Anyone has picture of those "pieces" I would like to see if we have some.
>>
>> Thanks,
>>
>>
>> Alvaro Herrera Ph.D.
>> NMR Center Director
>> Chemistry & Biochemistry Department
>> Auburn University
>> ------------------------------
>> *From:* main_at_ammrl.groups.io <main_at_ammrl.groups.io> on behalf of Kenneth
>> Sharp-Knott via groups.io <kknott=vt.edu_at_groups.io>
>> *Sent:* Wednesday, July 30, 2025 11:26 AM
>> *To:* main_at_ammrl.groups.io <main_at_ammrl.groups.io>
>> *Subject:* Re: [AMMRL] Helium Transfer Lines - Refreshing vacuum.
>> #poll-notice
>>
>> Just to follow-up... The reason I ask is the engineer mentioned that most
>> people wait far too long. By the time you see evidence of it having gone
>> soft, you have likely been losing quite a bit of helium due to excessive
>> boiloff for some time.
>> Apparently most transfer lines also come with the necessary equipment to
>> pump it down. They were some of the bit and pieces lying around the lab
>> that I had no idea of the purpose.
>>
>
> -- 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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