One other thing I've heard is that if you've got any sharp bends in the
flexlines between the compressor and the coldhead that those are noisier.
Though I'm not sure you can make a ton of changes with an already installed
system.
Cheers,Mike
On Thursday, April 2, 2026 at 12:23:13 PM MDT, Matthias Brandl via groups.io wrote:
Dear Xu,
...earplugs? (sorry, could not resist...)
More seriously: The main source of noise in GM cryocoolers is flow noise
through the metal hoses between the compressor and the cold head. I
can't quite make out the manufacturer of the compressor from the picures
on QT's website, but a while ago, we were visited by a Sumitomo
representative. He said that they are now offering special "low noise"
hose packs. Probably quite expensive, but if noise is a serious issue
for you, maybe worth the cost.
Also, use the shortest hoses possible for your application and siting.
Shorter hoses are much quieter.
Best,
Matthias
On 31/03/2026 21:23, Xu, Xu via groups.io wrote:
> Hi All,
> Anyone has complaints about the chirping noise from QT Helium Recovery
> System? How do you deal with this?
>
> Best,
> -Xu
>
--
Dr. rer. nat. Matthias Brandl (he/him or they/them)
Technical University of Munich
TUM School of Natural Sciences - BNMRZ
Chair of Biomolecular NMR Spectroscopy (Prof. Sattler)
Lichtenbergstr. 4 (postal)
Ernst-Otto-Fischer-Str. 2 (physical)
85748 Garching b. Muenchen
Phone +49 89 289-52617
matthias.brandl_at_tum.de
https://www.sattlerlab.de/
https://www.bnmrz.org/
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