Just a bit of additional info... Bruker gives you four options when it comes
to getting a Cryoprobe.
1) Outdoor air-cooled helium compressor
2) Indoor air-cooled helium compressor
3) Outdoor water-cooled helium compressor
4) Indoor water-cooled helium compressor
For the water cooled compressors, Ken has excellent advice, especially since a
lot of buildings' chilled water lines can often times be not up to the
task. Most folks I know who use water cooled compressors either have a really
good, reliable chilled water line, or use a higher end Neslab or Haskris cooler.
For the outdoor-based air cooled compressors, though, they don't need any extra
cooling. It's a good idea to keep the compressor coils cleaned off every few
months or so, if you're in a dusty area, since dirty coils will cause your system
to overheat and shut down.
For the indoor-based air cooled compressors (rare, but they do exist) you simply
need to make sure that the air conditioning in the room that houses the unit can
handle the heat.
When we first got our 600 MHz TCI Cryoprobe, we used an indoor-based air cooled
compressor, since it was impossible to get an outdoor unit installed while we
were stuck in the basement of a building that would have required some crazy
drilling, not to mention, impossibly long steel hoses for the helium lines.
We used it for 4 years, and it still looked pristine and clean after 4 years
of continual use.
Ronald Shin
University of Alabama at Birmingham
Central Alabama High Field NMR Facility
> From: main_at_ammrl.groups.io <main_at_ammrl.groups.io> On Behalf Of Kenneth Sharp-Knott via groups.io
> Sent: Thursday, August 31, 2023 11:21 AM
> To: main_at_ammrl.groups.io
> Subject: Re: [AMMRL] Question about LHe cryoprobe costs/He recovery
This is another major consideration for a Helium cryoprobe. You're going to
need a chiller for the compressor so either very good quality building chilled
water for an indoor chiller or an indoor/outdoor chiller which can be VERY
expensive to install.
--
Ken Sharp-Knott
Manager of Analytical Services and the NMR Facility
Department of Chemistry
Virginia Tech
(540)267-6502 (Cell)
(540)231-0885 (Office)
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Received on Thu Aug 31 2023 - 09:52:21 MST