This is a follow-up on the e-mail regarding spill from a broken tube
inside the magnet. Thanks to all those who sent replies.
Unfortunately, after looking at the extent of the spill, I have decided to
remove the autosampler, so I may clean the spinner housing. The
spinner housing itself shows evidence of the chemical spill, since
apparently the sample broke while inside the sample changer in a position
right over the magnet bore.
I took the spinner housing it apart and thoroughly cleaned it using
methanol and hexane since we were afraid to dissolve any rubber seals by
acetone or chloroform. The same solvent (methanol and hexane) were used
to clean the bore.
Luckily, I was able to re-assemble the autosampler and yesterday tested
that it works fine.
My only observation is that, after cleaning the bore, it is much harder to
push the probe into the magnet in the last few centimeters. Perhaps the
rubber o-rings on the probe need to be coated with grease? Are there
rubber o-rings up the room-temperature shim stack? We have Dow Corning
silicone stopcock grease here. Any recommendations?
-Edward
------------------------------------------------------------------------------
Edward T. Chainani Nuclear Magnetic Resonance Laboratory Manager
National Chemistry Instrumentation Center (NCIC)
Ateneo de Manila University phone: (632) 426-6001 loc. 5629
Loyola Heights, Quezon City e-mail: etch_at_ginto.chem.admu.edu.ph
Philippines FAX: (632) 426-1323
------------------------------------------------------------------------------
Received on Thu Jan 10 2002 - 11:30:13 MST