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 * 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 ******************************************************************** Michael M. Cheatham 312 Heroy Geology Laboratory Phone (315)-443-1261 Syracuse University Fax (315)-443-3363 Syracuse, NY 13244-1070 email:[log in to unmask] http://earthsciences.syr.edu owner of PLASMACHEM-L: http://listserv.syr.edu/archives/plasmachem-l.html owner of XRF-L: http://listserv.syr.edu/archives/xrf-l.html owner of TIMS-L: http://listserv.syr.edu/archives/tims-l.html ********************************************************************