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*
I use glycerol (glycerine). It doesn't evaporate, and is water-soluble, making cleanup easy in
case of some dreadful suck-back catastrophe
cheers
Ritchie
On 2 Jun 2010 at 0:23, Michael M Cheatham wrote:
JEOL Probe Users Listserver
Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, University of
Minnesota
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*
Steve,
Sometimes knowing what not to buy helps. So along that line of reasoning...
When I set up our JEOL 8600 I installed a Sepelco Rotameter. The unit I
purchased was Cat # 23325. The description is:
"flow range: 0-110 mL/min, with needle valve"
I have found that at the flow rate I use for my two GFPC spectrometers, the
rotameter barely registers!
Perhaps Suplco´s 23324, which is a 0-33 mL/Min unit with needle valve, would
have been the better choice???
BTW, I use Pfeiffer TL 011 turbo pump oil in my bubble flow indicator at the
exit point of the P-10 gas in my system. The slight yellow tint of the oil makes
it very easy to see the bubbles, it does not evaporate away very quickly, and I
see no trace of it backstreaming towards my detectors.
Mike
On 6/1/10 6:06 AM, "Steven Cogswell" <[log in to unmask]> wrote:
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University of Minnesota
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* Hello;
I'd like to clarify my position in the question I asked yesterday.
I have no intention of getting rid of the bubble device, and I have no
intention of getting rid of P10. I use the system now with a regulator, a
needle valve, and the bubble meter. My needle valve is unmarked as to
range, and is really too coarse for fine control over the rate - with the
side effect that if you bump the needle valve knob the flow rate changes
a lot. My intention is to replace this with a finer control rotameter which
has the needle control valve and a visual sight gauge to let you know that
it's actually set correct. Since the JEOL spec doesn't actually say what
the flow rate is in l/min (or at least I can't find it) I figured I would ask
if anyone knew.
Have a nice day.
Best regards,
Steven Cogswell
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Michael M. Cheatham
312 Heroy Geology LaboratoryPhone (315)-443-1261
Syracuse UniversityFax (315)-443-3363
Syracuse, NY 13244-1070
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http://earthsciences.syr.edu
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