Hi Martha,
We had a Bronkhurst fail shut and cause the magnet to quench...
I did not replace it...
That magnet had a tendency to show a helium vibration at 30 Hz in
the lineshape. I could see Hurricane Erin when it was 300 miles away.
Low barometric pressure increased the peak substantially
Probably not an issue for most things nowadays. Especially solids...
Try running a few things and see if it's a problem.
Dan Plant
Univ Fla
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Eastman, Margaret via groups.io
> Sent: Tuesday, May 30, 2023 10:40 AM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] AMMRL : Questions about manostat
>
> Dear AMMRL Group:
> We have lost the manostat on our old Oxford (unshielded) 600 MHz magnet,
> since it is too old for the manufacturer Bronkhorst to repair. I am being
> asked to justify buying a new one. It seems that the manostat would be a
> better buffer interfacing with a helium recovery system than a back pressure
> regulator, which does not set an absolute pressure but varies with the
> atmospheric pressure. I must also answer the question of whether the manostat
> is required for successful spectroscopy. What effects show up in spectra if
> the manostat is not present for a 600 MHz or higher magnet? Are these effects
> not seen in rapidly obtained spectra, say taken in several minutes to one
> hour? Are the effects likely to be a problem when taking longer spectra of
> biomolecules with an indirect detection probe? Are the effects likely to be
> a problem, or not, when working with solid-state probes? We have several
> different probes on this system and want to be sure that capabilities are
> not lost or harmed.
> Margaret
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Received on Tue May 30 2023 - 08:16:09 MST