Re: [APML] Dry Nitrogen & Pre purified Grade 5 same ??

["joe" <jmize@svic.net>]

Gerry;

     I thimk getting oil in commercial Dry N2 is remote as they should have
already been filtering it in the first place.  There is a concern about oil
though.  I once read a thread about being careful of some types of oil type
vaccum pumps because they can allow oil to pass and possibly affect film in
hyper chambers.  If the "New" Dry N2 is all they have you'll be okay and it
shouldn't be any more expensive...joe  :)


"May You Go Among The Imperishable Stars"

Joe Mize:         http://www.svic.net/jmize
29:24'33.4"N    82:51'37.7"W
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----- Original Message ----- 
From: "Gerry Cichocki" <gcichocki@hotmail.com>
To: <astro-photo@seds.org>
Sent: Saturday, May 31, 2003 8:53 AM
Subject: [APML] Dry Nitrogen & Pre purified Grade 5 same ??


> Good Morning group, trying to put together a nitrogen purge system on a
> Nikon F3. Got a lot of info  on here over a year ago & finally got the
> regulator &  low-flow meter.
> I called the gas supply store & they say "dry nitrogen" is "old school" &
> what they carry is Grade 5 pre-purified (grade 5.5 & 6 is the highest).
This
> is supposed to be much better  because the dry nitrogen was pumped in a
way
> that it was possible to get some oil in the tank. The pre-purified
> eliminates that.
> So can I use this pre-purified grade 5 stuff ? Any info on this subject is
> appreciated. Gerry
>
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