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June 2010

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Subject:
From:
Ritchie Sims <[log in to unmask]>
Reply To:
JEOL-Focused Probe Users List <[log in to unmask]>
Date:
Wed, 2 Jun 2010 07:51:25 +1200
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JEOL Probe Users Listserver

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Electron Microprobe Lab, University of Minnesota

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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:

    JEOL Probe Users Listserver
    
    Moderator: Ellery Frahm, [log in to unmask], Electron Microprobe Lab, 
    University of Minnesota
    
    Post a message: send your message to [log in to unmask]
    
    Unsubscribe: send "SIGNOFF PROBEUSERS" to [log in to unmask]
    
    On-line help and FAQ: http://probelab.geo.umn.edu/listserver.html
    
    * 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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