--
John Decatur, Ph. D.
Director of NMR Facility
Department of Chemistry
3000 Broadway, Mailcode 3179
Columbia University
New York, NY 10027
212-854-2155 (voice)
212-932-1289 (fax)
decatur_at_chem.columbia.edu
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: Tanja Pietrass [mailto:tanja_at_nmt.edu]
> Sent: Friday, August 01, 2003 9:01 AM
> To: Barthel-Rosa, Luis P.
> Subject: Re: Air filtration for Bruker MAS probes
Dear Luis,
in my experience, water is much more of a concern than particulates. I have
been using a Hankison drying tower with pre- and after-filter for about 7
years now. I don't do MAS on a regular basis though. The only problems I
had with the input air in the tower being too wet, and I ruined an MAS unit
this way and had to send my MAS probe for repair.
I use a Gast oilless compressor and a 60 ga vertical tank. Now I also use a
water separator before the air goes into the Hankison. That has been
working quite well. Living in NM, I poked a hole in the roof and am getting
my inlet air now from the outside which is dryer than inside the building.
I rigged a car air filter under a little "umbrella" for weather protection
to pre-clean the inlet air. I use a regular Nappa automotive hose to get
the air down to my compressor.
I'd be happy to send you more info on my Hankison. If I'm not mistaken, it
was about 1.5 k or even less. If I had the money, I would install a drying
system based on refrigeration, and use that as a prestage to the Hankison.
Those are more like 5k, I believe (that's why I haven't done it).
Cheers
Tanja
Dr. Tanja Pietraß ph. (505) 835-5586
Associate Professor fax (505) 835-5364
Department of Chemistry www.nmt.edu/~tanja
New Mexico Tech
Socorro, NM 87801
USA
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: Robert D Scott [mailto:scott_at_iastate.edu]
> Sent: Friday, August 01, 2003 9:34 AM
> To: Barthel-Rosa, Luis P.
> Subject: Re: Air filtration for Bruker MAS probes
Luis,
We have a MSL-300. The MAS probes seem to be happy with
a balstron 92A with a 100-12 element and a Schrader Bellows
super 99 filter. We only spin to 5k tho.
hth,
dave scott
iowa state university
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: Ian Marshall [mailto:Ian.Marshall_at_Scynexis.com]
> Sent: Friday, August 01, 2003 9:49 AM
> To: 'Barthel-Rosa, Luis P.'
> Subject: RE: Air filtration for Bruker MAS probes
Luis,
We use an Ultrafilter AG0006 with MF03/10 which has a 1u particle retention
of 99.9998% on the input to each of our NMR systems including an Avance400
with HR-MAS. These units were supplied by Bruker UK and to date we haven't
experienced any problems with any of them. Working on the principal that if
they are supplied by the manufacturer then you can't go far wrong I'd sugest
you check out price & availability - (www.ultafilter.com - specification
sheets available for download) or Ultrafilter inc, 3560 Engineering Drive,
Norcross, GA 30092
Tel: +1 770 448 3363, Fax: +1 770 448 3854, Tollfree: 800 543 3634, Email:
info_at_ultrafilter-us.com
Best Regards
Ian
Ian Marshall
Analytics Group , SCYNEXIS Europe Ltd.
www.scynexis.com
email: ian.marshall_at_scynexis.com
Tel: +44 (0)1277 367017 (Direct)
+44 (0)1277 367000 (Switchboard)
Fax: +44 (0)1277 367099
SCYNEXIS Europe Limited, Fyfield Business & Research Park, Fyfield Road,
Ongar, Essex, CM5 0GS.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: Bruce D. Ray [mailto:bray_at_iupui.edu]
> Sent: Friday, August 01, 2003 10:27 AM
> To: Barthel-Rosa, Luis P.
> Subject: Re: Air filtration for Bruker MAS probes
For all my air filtration, I use Balston filters from
Balston, Inc.
703 Massachusetts Ave., Box C
Lexington, MA 02173
phone no.: 800-343-4048
They have many different sizes and degrees of entrapment
available and can handle virtually any pressure and flow
rate combination.
Hope that helps.
Bruce D. Ray, Ph.D.
bray_at_iupui.edu
Associate Scientist,
Operations Director
NMR Center
IUPUI
Physics Dept.
402 N. Blackford St.
Indianapolis, IN 46202-3273
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: charlie dickinson [mailto:charlie_at_telemann.pse.umass.edu]
> Sent: Friday, August 01, 2003 11:02 AM
> To: Barthel-Rosa, Luis P.
> Subject: Re: Air filtration for Bruker MAS probes
At Umass we have operated our Bruker MAS spectrometers
for over 20 years with only the Balston dried/filtered air.
It is a Balston 75-20 with their 100-BX and -DX particle
filters, their normal wall mounted product. That has been
entirely sufficient... If your air is already dried, you
might look into their two stage filter cartridges. It will
cost you maybe about the same as the filter you found but
we have not had the clogging problem and change the
cheap inserts once a year.
C.Dickinson
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: Charles G. Fry [mailto:fry_at_chem.wisc.edu]
> Sent: Friday, August 01, 2003 12:28 PM
> To: Barthel-Rosa, Luis P.
> Subject: Re: Air filtration for Bruker MAS probes
Luis,
Bruker can tell you the specifics about using liquid N2 tanks for your
high-pressure air for MAS systems. If you get two of the LN2 dewars, you
can be changing one while using the other. I think one tank lasts about two
weeks, with typical usage. This might be a simpler option than getting a
fancy air filtration system.
Charlie
~~~~~~~~~~~~~~~~~~~~~~~
Charles G. Fry, Ph.D. Tel: (608)262-3182
Director, MR Facility Fax: (608)262-0381
Chem. Dept., 1101 University Ave, Univ. Wisconsin-Madison
Madison, WI 53706 USA email: fry_at_chem.wisc.edu
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> From: Lawrence B. Alemany [mailto:lalemany_at_rice.edu]
> Sent: Friday, August 01, 2003 3:43 PM
> To: Barthel-Rosa, Luis P.
> Subject: Re: Air filtration for Bruker MAS probes
Dear Luis,
To clean up our compressed air, we're using a Balston/Whatman Model
64-20 drier and Model 72-012 receiving (ballast) tank on a Bruker 200 and a
Model 76-40 (larger) and the same model ballast tank to supply both a
Bruker 400 and 500. Hope this helps.
Larry Alemany
NMR Manager, Senior Research Scientist,
and Lecturer
Department of Chemistry
Rice University
Houston, TX 77005
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
-----Original Message-----
> From: Barthel-Rosa, Luis P. [mailto:barthell_at_dpg.army.mil]
> Sent: Tuesday, July 29, 2003 11:49 AM
> To: AMMRL (E-mail)
> Subject: Air filtration for Bruker MAS probes
Dear AMMRL members,
Our site is about to receive and install a Bruker 300 AVANCE system
including a Level I Solids accessory upgrade. Our facility can supply
compressed air via oilless compressor and is already fitted with drying
towers. We do not have the ability to use nitrogen as instrument air.
According to the Site Planning Guide, for MAS probes we need to supply 8.0
cu.ft./min at 80-120 psig after drying. In addition for the MAS probe, we
need to remove particulates with 1 micron filters that retain 99.99% of
specified particles. I have only been able to locate one manufacturer
(Mykrolis, www.mykrolis.com) that can supply a filter that will operate at
the required pressures and flow rates. I contacted Millipore and they
directed me to Mykrolis. The product they recommended is a Wafergard Max
Bronze in-line Teflon gas filter, designed to be disposed of and replaced
when spent. However, this filter exceeds our requirements as greater than
99.9999999% retention of 0.003 micron particles. The filter costs $325 and
comes with a 1 year warranty. I'm a bit concerned about excessive plugging
and these filters are really designed for the semiconductor industry.
I'd like to know if any members out there with similar air flow
requirements or equipment are using this filter or other
brands/manufactures. Am I buying the right filter? Is there another type
of filter that will meet our requirements? Any advice, input is appreciated.
Regards, Luis
Luis P. Barthel-Rosa, Ph.D.
Project Scientist
Battelle Dugway Operations
U.S. Army Dugway Proving Ground
P.O. Box 217 or Bldg. 4239
Dugway, UT 84022
435-831-5836 (phone)
435-831-5922 (fax)
barthell_at_dpg.army.mil
barthel-rosal_at_battelle.org
Received on Fri Aug 22 2003 - 16:15:52 MST
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