Hi Fahu,
I think what you need is a desiccating air dryer that attaches to the air
compressor or the air feed line. If your building already has suitable
compressed air then all you need is an air dryer. This is the one we
purchased about 12 years ago.
https://www.govsci.com/product-detail/Parker--Hannifin/UDA-300/EA/
If you need a dedicated air compressor, please note that they can be quite
loud. Another issue is that you need a moisture trap because when you
compress the air, you compress the moisture too. We had an Atlas-Copco SF4
compressor attached to the above air dryer in my old lab and it worked out
great.
https://www.aircompressorsdirect.com/tools/atlas-copco-sf4-air-compressors.html
It's also a good idea to have a few extra filters in case water or oil
happens to get into the air line. Water getting into the spectrometer can
cause major damage.
Thanks,
Mark
On Fri, Feb 23, 2024 at 9:59 AM Xia, Youlin via groups.io <youlin.x=
ia=
stjude.org_at_groups.io> wrote:
> Dear all,
>
> We are considering purchasing an air compressor working for both 400 MHz
> (room temp probe with BCU1; ordered) and 700 MHz (cryoprobe with BCU2;
> currently working with a small air compressor temporarily). From Bruker’s
> manual, BCU1 requires a dew point of -50C for the compressed gas and BCU2
> requires -80C. Now the situation we are facing is the air compressor with
> dew point of -70C is much expensive and with several months lead time. The
> one with the dew point of -40C is available and cheaper. We hope to get the
> 400 MHz installed as early as possible and can’t wait the one with -70C
> ready.
>
> We really appreciate you can provide us your experience and advice on
> choosing the right air compressor.
>
> 1, Does the air compressor with dew point of -40C work well for your
> machines with BCU2?
>
> 2, Is a dryer a must have if you use the air compressor with dew point of
> -40C? If yes, could you please provide the details (brand, model, cost,
> reliability, etc.)?
>
> 3, Do you think it must use the air compressor with dew point of -70C for
> NMR machines with BCU2 (probable we only found one type with -70C)?
>
> 4, Could you please recommend the air compressor with dew point lower than
> -70C if we must to have?
>
> 5, Any other advice for the compressed air supply with such required
> quality for our case (equipped with BCU1 and BCU2)?
>
> Really appreciate your information!
>
> Thanks,
>
> Fahu
>
> Fahu.he_at_slu.edu
>
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