HI,
We have a setup like the one described below and has been working fine.
When we want to run below -40C i switch over to nitrogen. There is a
ballast tank on the incoming line that supports the dryer. About 5 feet
tall. It is all enclosed in a sound proofed cabinet. The NMR has a
ballast tank in the console. Fortunately the service department just
installed a _centrifical_ compressor on the lines after burning out
several piston type. They got the message. It is a new type to me,
reminds me of the turbo pumps. But it is not noisy like the older piston
type. It never shuts off but changes its speed as necessary to keep a
constant pressure. But it delivers with lots of muscle. NO OIL. good
luck
Jim
"John W. Fowble" wrote:
>
> Exactly my experience and configuration too. And its nice to have the
> thing in a closet so you don't have to listen to the "blowout". Or,
> put it in the corridor and let it "surprise" passers-by ;-) !
> -Jack Fowble
> ------------------------------
> From: Michael Strain <strain_at_mango.uoregon.edu>
> Wed, 1 Mar 2000 10:31:42 -0800 (PST)
> To: Joseph <vaughn_at_pro.sb.fsu.edu>
> Cc: ammrl_at_wwitch.unl.edu
> Subject: Re: air dryers
>
> On Wed, 1 Mar 2000, Joseph wrote:
>
> > Colleagues
> > We are considering getting a Balston model 75-20 (-100F dewpoint)
> > compressed air dryer. Does any one out there have any comments (good or
> > bad) they are willing to share regarding these dryers? Do they need a
> > earlier stage (e.g. -40F dewpoint) to work properly?
> > Thanks for your input.
> >
>
> We have two of the Balston 75-20 units... they work fine but
> a ballast tank on the outlet is essential to even out pressure
> spikes when the unit cycles between the two columns. We use
> the Balston 72-012 "Receiver Tank".
>
> If your house air is particularly icky an extra trap is a good idea.
> Our house air is pretty oily.
>
> Each Balston 75-20 will support more than one NMR system.
> We have our 300 and 500 connected to one unit.
>
> --Mike
> -----------------------------------------------------------------------
> Michael Strain strain_at_mango.uoregon.edu
> Institute of Molecular Biology desk/voice-mail: 541-346-4605
> & Department of Chemistry FAX: 541-346-5891
> University of Oregon, Eugene, OR 97403
> -----------------------------------------------------------------------
> --------------------------
> John W. Fowble
> OSU College of Pharmacy
> 614-292-6838
> fowble.1_at_osu.edu
--
My personal web page is :
http://www.uvm.edu/~jbreeyea
Location:
University of Vermont
Chemistry Dept.
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Burlington, Vermont 05405
Tel: 802 656 0196
Fax: 802 656 8705
Received on Thu Mar 02 2000 - 09:00:06 MST