Hi all,
I suppose none of us are immune to spinner problems and we are no
exception. This latest one prompts me to write. In between probe changes
on our routine-use Varian INOVA 400, we performed our yearly upper barrel
(UB) cleaning (alcohol-wet kim wipes ramrodded through until clean, purge
with N2 gas for several min). After replacing everything, the sample would
not spin. We tried all the usual suspects: clean and use different
spinners, increase supply gas, reboot system, remove and reseat UB, insure
all connection were made, increase bearing flow and general fiddling to no
avail. Both Varian 4-nuc and Nalorac probes had same result. If I plug the
UB with my hand to momentarily build pressure on the UB and "pop" the
sample up slightly, the sample spins nicely in this "levitated" position.
You can remove the rotation air inlet at the top of the UB and the sample
remains spinning (suggesting the bearing supply is OK?). If the spinner is
turned off and hence the sample returns to the standard position in the
UB, spin stops and does not start. Is this a bearing gas problem or is
there some "duh" thing that I am missing?
Thanks for your time,
Joe
--
Joseph J Barchi, Jr, Ph.D.
National Cancer Institute, Frederick
376 Boyles Street, PO Box B
Bldg 376, Rm 209
Frederick, MD 21702
301-846-5905 (Voice)
301-846-6033 (FAX)
barchi_at_helix.nih.gov
Received on Mon Dec 13 2004 - 11:04:35 MST