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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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* 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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