Date: Wed, 21 Feb 2024 13:04:18 -0500
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 tryto 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
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(image/jpeg attachment: Silver_One_Way_Valve.jpg)