Brian,

in brief:
- remove the capillaries from the bulkhead (where the sample gas enters the gasbench) and the Valco.
- open screws at both ends of the plastic liner with two wrenches. One holds the liner in place (larger) and the other opens the nut (smaller). For that I cut ("shortened”) the larger wrench so that you do not run into trouble with all the other stuff in your way inside the GB.
- pull out the entire thing (nafion with capillaries at both ends)
- You might use new capillaries (0.32ID, 0.44OD standard FS)
- cut a piece of nafion of about roughly the correct length (around 20cm, I guess). I use a razor blade.
- put in methanol and push over the ends of the capillaries for about 1cm or so. Wait.
- Put back into the plastic linder and fix the ferrule at one end
- Pull slightly on the other and fix other ferrule. Easier with 3 hands.
- reconnect to bulkhead and Valco.

I might have some photos somewhere...

Trouble you might observe:
- Ferrule does not get out of Valco or bulkhead
- you break other capillaries inside

regards,
Robert



> Am 13.10.2020 um 17:05 schrieb Giebel, Brian <[log in to unmask]>:
> 
> Hello List – 
>  
> My d18O values have started to get a bit chaotic while performing carbonate measurements in the gas bench, competitively d13C have remained steady.
>  
> It seems like the first nafion dryer may need to be replaced based on suggestions here and elsewhere. Aside from the methanol expansion, I am wondering if there are other suggestions/diagrams on how to go about this replacement? Nothing appears within the Thermo manual about doing so from what I can tell.
>  
> A suggestion here: https://list.uvm.edu/cgi-bin/wa?A2=ISOGEOCHEM;1b7dc65d.0806 – leads me to think the old wikipage may have had some additional context.
>  
> Thanks in advance,
> Brian
>  
>  
> Brian M. Giebel, Ph.D.
>  
> Assistant Research Professor, Environmental Sciences Initiative
> Core Fcility Director, Advanced Laboratory for Chemical & Isotopic Signatures
> CUNY Advanced Science Research Center
> 85 Saint Nicholas Terrace
> New York, NY 10031
>  
> phone: +1 212 413 3151

-- 
PD Dr. Robert van Geldern
Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) | GeoZentrum Nordbayern
Schlossgarten 5 | 91054 Erlangen | Germany 
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