We have a Spectrospin Bruker 300 MHz magnet which we (I and several
graduate students) have filled once every 6 months for the past 7 years.
It has been a carefree, robust magnet. After the last fill 19 days ago,
the He level is going down at twice the old rate. The He gas pushing
pressure was probably higher on this fill than ever because the transfer
time was the lowest ever. I don't know what this pressure is because I
have never measured it with a gauge. Did I cause the seals to go, or do
they generally give up after 7 years anyway? There is some information
in the archives but I thought I'd add this.
If you reply directly to me at
rhoneych_at_gmu.edu
I will summarize for the list. Thank you very much.
Bob Honeychuck
George Mason University
Received on Mon Oct 08 2001 - 16:38:00 MST