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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