Hi Jessica,
It should be fine with a mini-split (which we have in use) in terms of
vibrations or whatever etc.
I echo the concerns about directing the flow directly towards the magnet
and the electronics, so siting can be problematic, as we have since it leads
to:
And the other integral component of the NMR system should not be neglected -
the users. Not just ridiculous to have to put on warm clothing to work, but
a hoodie to protect against the direct draft!...grrrr.
Depending on the humidity and selected Antarctic setting, a lot of condensation
can result with a mini-split so I would advise having a good and reliable pump
to drain away the condensation and a contingency in place in case of a pump
failure. After 4 floods in 2 years we are finally changing to a new pump system
and, hopefully, a back up in case of pump failure.
Regards,
K. Klika
________________________________________
>From: main_at_ammrl.groups.io on behalf of Spin-Doc
> Sent: 13 August 2025 10:08:05
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Question about Dehumidifiers/Mini-Splits
Hi,
Many NMR labs use these and they usually create no issues, but you should
try your best to not have its airflow point at the magnet which can induce
shim changes by cooling it on one side in an on/off fashion as these units
usually are regulated by the length of their on- vs. off-state.
You also should not point its airstream towards the console as the gain of
e.g. amplifiers may change a little bit (found everywhere throughout an NMR
console - synthesizer, transmitter, RF amp, preamps…). This can mess
up precise quantitative experiments.
Finally there is nothing more annoying for a n NMR user if there’s
cold air blowing into your neck, so also don’t let it blow at the
operator desk…
May be a bit tricky to find the best spot in the end!
Cheers
Bert
-> Sent via mobile <-
Spin-Doc
Magnetic resonance equipment, service, training & more
Dr. rer. nat. Bert Heise
Owner, applications scientist
Kiefernweg 13
58239 Schwerte
Germany
Web: http://www.spin-doc.net
Mail: bert.heise_at_spin-doc.net
Phone: +49-171-5135315
Representing MestreLab, Stelar & Barthel HF
Am 12.08.2025 um 22:21 schrieb Roberts, Jessica via groups.io:
Hi everyone,
I am currently in the process of talking to vendors regarding potentially
installing a dedicated dehumidifier system and/or mini-split into the NMR
facility. I was wondering what folks in particularly humid settings use for
environmental stability? My biggest concern is whether these methods will
introduce undesirable vibrational noise to spectra or have other non-ideal
consequences.
Thoughts? And thank you so much in advance!
Cheers,
Jessica
Dr. Jessica M. Roberts, Ph.D.
Assistant Professor of Instruction
Nuclear Magnetic Resonance Spectroscopy and Mass Spectrometry Facility Manager
Department of Chemistry and Biochemistry
Ohio University
245 Chemistry
Athens, OH 45701
740.593.0038
jroberts_at_ohio.edu
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