I'd be very happy to learn about the design details for a pipette,
beeing a priory accurate to 5 digits. Can you please share these
information?
Thanks
Axel
(the next noble gas machine to build surely comes...)
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Axel Suckow
Isotope Hydrologist, Geochronologist
Isotope Hydrology Laboratory
International Atomic Energy Agency
Wagramer Strasse 5
A-1400 Vienna
Austria
Phone: 0043 1 2600 21759 (desk) or 26762 (mass spec)
email: [log in to unmask]
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
> -----Original Message-----
> From: Noble Gas Geochemistry Network
> [mailto:[log in to unmask]] On Behalf Of Paul Wigton
> Sent: Thursday, 12 November 2009 18:12
> To: [log in to unmask]
> Subject: Re: air pipette repair/construction
>
> When I was designing an extraction system at USGS a few years
> ago, I also designed a new air pipette that was accurate in
> its volume to 5 sig figs.
> I'm not sure if Mike Cosca used the design but if he did, he
> can tell you about it. AFAIK, Doerflingers are NLA and
> non-repairable. I search the world for one and could never find one.
>
> Paul H. Wigton II
> Manager, USGS-Denver Machine and Fabrication Shop
> 303-236-1223
> Denver Federal Center
> Building 20, MS 964-D
> Denver, Colorado 80225
>
>
>
> From:
> Ronny Friedrich <[log in to unmask]>
> To:
> [log in to unmask]
> Date:
> 11/12/2009 10:08 AM
> Subject:
> Re: air pipette repair/construction
> Sent by:
> Noble Gas Geochemistry Network <[log in to unmask]>
>
>
>
> Hi Joerg,
> I'd been working in Heidelberg as a PhD student and actually
> met Doerflinger there.
> I think that the guys in Heidelberg still have the knowledge
> to repair these pipettes, although I don't know if
> Doerflinger is still around.
>
> While I was still in Heidelberg we built a totally different
> designed pipette that might hold some advantages compared to
> the Doerflinger one and comes with a perfectly per-calibrated volume.
>
> Let me ask my colleagues there.
>
> I'll let you know.
> Ronny
>
> On Nov 12, 2009, at 7:18 AM, Joerg Pfaender wrote:
>
> Hi all,
>
> I just realized that our Doerflinger air pipette is damaged,
> i.e. the valve on our air inlet side is leaking since the
> recent bakeout. I suspect a damaged bellow as opening and
> closing the valve makes the problem worse.
> I'm
> now thinking about opening the Doerflinger to check out what
> the problem may be and whether it can be fixed or not. Does
> anyone have experiences in doing so, or has anyone ever
> repaired a Doerflinger?
>
> I'd appreciate also every hint on how to manufacture an own
> air inlet system, plans, ideas, whatever.
>
> Thanks,
>
> Joerg
>
> Dr. H. Ronny Friedrich
> Lamont-Doherty Earth Observatory
> Columbia University
> 61 Route 9W
> Palisades, New York 10964
> [log in to unmask]
>
>
>
>
>
>
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