Hello,
many thanks for all responses.
The described event seems to be rather rare. It happened in a few cases. Maybe this depends on the environmental conditions.
I tried to measure the temperature inside the bore with shim system inside but without any current. The result is somewhat
Between 8 and 10 degree centigrade. That's inside the range of the dew point for average humidity. There seems
to be a dependence on the lab air conditioning.
Furthermore there are some changes made to avoid the effect. Here I am only able to present the changes for Bruker
spectrometers. No feedback from Agilent.
Since a few years there exists the possibility to blow dry air or nitrogen into the gap between shim system and
the magnet bore. The inlet is located on top of the shim system. A low flow is sufficient.
Shimsystem damaged by the corrosion get a better corrosion protection during the repair.
And finally there is a system called shim plug, but to be honest so far I have no idea, what this means.
Many thanks for all responses.
Rainer
Received on Thu Oct 04 2012 - 02:27:48 MST