Hello Fahu!
Am Freitag, Februar 23, 2024 18:10 CET, schrieb "Xia, Youlin via groups.io":
> 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<mailto:Fahu.he_at_slu.edu>
>
There is NO lonely air compressor with -70 °C dew point on the market.
This unit compresses the air with the moisture inside. So there is always not
a low dew point to get from. Sorry.
You have always to get a second device behind the compressor for the air treatment.
This always depends on the pumping device - some are oiling the compressed air.
So you have to treat the compressed air - de-oiling and de-watering and de-dusting
the air behind the pump.
You can use a freezer or an adsorbing device to minimize the water in the air. Thats
all you need. But you can look on the capabilities of these devices. I have no idea what
suits for you best - I am in Europe.
I use an adsorber for drying my air. This jumps between two columns and produces
a spike in the air stream - so you have to compensate this with a ballast tank.
Yours sincerely,
Ulrich Haunz
>
> ________________________________
>
=========================
Ulrich Haunz, Dipl.-Ing. (FH)
NMR-Spektroskopie
Raum L 710, L 807
NMR-Center M520, M521, M527
Postfach M 715
Fachbereich Chemie
Universitaet Konstanz
78457 Konstanz
Tel.: +49 (0)7531 88-4261 -> M521 Bruker Avance NEO 800
Tel.: +49 (0)7531 88-4422 -> L807 JEOL Lambda 400
Tel.: +49 (0)7531 88-4955 -> L710 Bruker AVIII HD 400
Tel.: +49 (0)7531 88-4956 -> M520a Bruker AVIII 600
Tel.: +49 (0)7531 88-4957 -> M527 Bruker AVIII 400 Automation
Tel.: +49 (0)7531 88-4958 -> M520 Bruker AVIII 400 WB
Tel.: +49 (0)170 9153213
FAX : +49 (0)7531 88-3898
=========================
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Received on Fri Feb 23 2024 - 10:23:36 MST