Date: Wed, 21 Feb 2024 14:11:25 -0800
Hello All,
There is an adapter sold by Bruker that allows you to connect the silver
one-way-valves (Z58140) to KF-25 clamps -- see the photo below. They call
them:
Z52523 ADAPTER KF25 HE MANIFOLD D2XX
We paid with the shipping and taxes included approximately $150 for these a
few years ago.
Best,
Hasan
On Wed, Feb 21, 2024 at 10:09 AM Bob Berno <bberno_at_mcmaster.ca> wrote:
> Hello Karel,
>
> I can't comment on the main topic of your email, but I wanted to answer
> your questions about the one-way valve on your helium exhaust port.
> I don't know what the fittings look like at the top of your helium
> manifold, but from the photo you provided I suspect you have some sort
> of adapter that allows you to connect a piece of Tygon (or similar)
> tubing to the check valve you showed in your photo.
> Basically, you want to replace the adapter+small check valve with
> something like the silver one-way valve shown in the attached photo.
> Fortunately, this photo also shows the Bruker part number, for your
> ordering convenience. About four years ago it cost about $365.00 CDN.
>
> This silver one-way valve is what we have on all but one of our
> magnets. However, you might not be able to attach this directly to your
> existing manifold because it may be looking for something which has a
> KF-25 type fitting. Then, you would also need a KF 25 adapter that will
> allow you to screw one-way valve into place. Off hand I don't seem to
> have the part number for that.
>
> One other option would be to get a different one-way valve which already
> had the KF-25 fittings on both ends. A few years ago when Bruker was on
> site to re-energize an old magnet, the magnet engineer installed a
> one-way valve like the one in the photo shown in this link:
> https://mcloud.mcmaster.ca/s/SM6963SwWSof4WK
> It's a little hard to see, but it looks like it has Part Number: Z58140
> I have no idea what this costs.
>
> I hope this helps.
> Bob.
>
> On 2024-02-21 10:25 a.m., Karel Klika via groups.io wrote:
> >
> > Dear all,
> >
> > We have a problem with pulsecal, sometimes it works, sometimes
> more-or-less (i.e. poorly), sometimes really badly (10x or even 100x longer
> pulse width than it should be), and sometimes fails completely (“ no peak
> found in the area”). The results can vary widely on immediate consecutive
> runs of pulsecal, e.g. a good or near reasonable result to complete failure
> or a nonsense result. Pulsecal has been used for many years with no
> problems, now suddenly not. Attached are pics of the nutation when it fails
> completely. I have run ha for the amplifier and it seems fine, the pulse
> widths for proton (both hard and soft) and an X nucleus are fine, both
> decoupling and pre-saturation for proton are also working as per normal,
> and sensitivities for both proton and an X nucleus also seem fine. The
> probe is a 5-mm BBO (Z108618_0274) and the console is an Avance III
> (H03128OB). I have rebooted TopSpin (version 3.6.2 running under Windows 7)
> and the console multiple times, recompiled pulsecal, and used the pulse
> sequence pulsecal in place of pulsecal.2. Usually, pulsecal seems to work
> with just about any sample, but I have been testing on the standard sucrose
> in 90% H2O. What could be wrong and how to fix the problem ? Let me know
> please what I should try to diagnose the fault/fix the problem.
>
> I don’t know if this is related, but usually the nutation arrays (popt)
> that I run are fine, but this one result (pic attached) is very strange,
> and it was run immediately after a normal looking result on the same sample
> for the same pulse width determination (just run with smaller steps for
> finer evaluation). Subsequent runs on other samples were also normal
> looking. The strange result is not the result of too high an rg value as it
> was not changed. It even resembles what a double FT of the signals might
> look like ?
>
>
> Also,
> 1. Anyone know what is the heat output on the various low, medium, and
> high settings for a BCU-II ? It is listed as 2.4 kW, but would it be fair
> to assume that this is for the high setting and that for the low setting it
> is only 0.5 kW, i.e. the same as the BCU-I ?
> 2. Is it possible to fit a modern helium check valve to our 2010 vintage
> magnet ? (pics attached) When we do helium fills we take the current check
> valve off; in my previous post we left the more modern check valve in
> place. So can we do helium fills with the modern check valve in place on
> this magnet if we can replace it ? Anyone happen to know the part number
> for the more modern check valve ?
>
> Thank you very much in advance.
>
> Kind regards,
> Karel Klika
>
>
> --
> 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
>
> -------------------------------------------------------------------------
> This email contains CONFIDENTIAL information intended for the specific recipient(s).
> If you have an accommodation need for a planned meeting, please e-mail me directly and
> I will do my best to make appropriate arrangements.
> Should you require any materials sent via this e-mail address in an alternate/accessible
> format, please let me know.
>
> McMaster University sits on the traditional Territories of the Mississauga and
> Haudenosaunee Nations, and within the lands protected by the "Dish With One
> Spoon" wampum agreement.
>
>
--
_____________________________
Director, PMRC Core NMR Facility
College of Chemistry
University of California, Berkeley
227A Hildebrand Hall
Office: (510) 643-9829
Cell: (949) 732-8175
CONFIDENTIALITY NOTICE: This e-mail, including any attachments, is for the
sole use of the intended recipient and may contain information that is
confidential and privileged under state and federal privacy laws. If you
received this e-mail in error, be aware that any unauthorized use,
disclosure, copying or distribution is strictly prohibited. Please contact
the sender immediately and delete/destroy all copies of this message.
-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.
View/Reply Online (#1006): https://urldefense.com/v3/__https://ammrl.groups=
.io/g/main/message/1006__;!!PvDODwlR4mBZyAb0!Q8JqiWR-OwFFC7tYF0nn2OW9GX4qoV=
jIxGMYsxl3EFp4alhMaCtxFkBCKXK0lwXIiZYr1khlIVd_uqZ37gO4U-L3QD0Z$
Mute This Topic: https://urldefense.com/v3/__https://groups.io/mt/104493541=
/7559972__;!!PvDODwlR4mBZyAb0!Q8JqiWR-OwFFC7tYF0nn2OW9GX4qoVjIxGMYsxl3EFp4a=
lhMaCtxFkBCKXK0lwXIiZYr1khlIVd_uqZ37gO4U45BJHn1$
Group Owner: main+owner_at_ammrl.groups.io
-=-=-=-=-=-=-=-=-=-=-=-
(image/jpeg attachment: 20240221_134539.jpg)