Greetings all,
Thank you all for your outpouring of answers. I have learned more about my system thanks to all of you. I appreciate your response. I was not aware of how the system collected its Helium data, so I appreciate this new knowledge. As an added point, we purchased the system with the DSPect computer upgrade, so it is not the original Bruker AC computer. The system is now reading 100%, so I believe the common thought of an ice blockage due to the helium fill is likely true and it melted off with the reading of level. As most of my knowledge on this instrument is being gained the old fashioned way of learning as I go, I appreciate any new knowledge that I can use and store.
To clarify some points for you. I do not recover the helium, so I know it was full as the helium plume upon the Dewar being full was very obvious with my current outdoor freezing temperatures. I had thought about thumping the magnet, but didn’t want to do it yet as it had just been filled. In about 6 weeks my system will be moving to its new permanent home in the recently finished addition to my chemistry building. As this will be done by an outside contractor, I will be watching closely as this happens. The system will be moving cold, but de-energized and I am curious to watch how this will be accomplished. I will keep in mind all of your assistance as I get closer to the move date.
Thank you again for all of your assistance and to settle my slightly rattled nerves about this rather expensive and sometimes touchy instrument.
Have a great day,
Margaret Smallbrock
Chemical and Instrumentation Specialist
Department of Chemistry
SD School of Mines
501 East St. Joseph Street
Rapid City, SD 57701
605-394-1236 - phone
605-394-1232 - fax
margaret.smallbrock_at_sdsmt.edu<mailto:margaret.smallbrock_at_sdsmt.edu>
From: Smallbrock, Margaret A. [mailto:Margaret.Smallbrock_at_sdsmt.edu]
Sent: Monday, November 22, 2010 3:20 PM
To: ammrl_at_ammrl.org
Subject: ammrl: Helium Fill Question
Greetings all,
I am the caretaker for a lone Bruker AC300 NMR. I filled it with liquid Helium this morning and the fill appeared to go fine. It was just like the previous 2 fills that I have done with this system. However, this is my question, the Helium percent level that the console gives as a number has not changed from the pre-fill value. Should I be concerned about this? My previous system often gave false numbers to me, but it was a QE 300 system and not a Bruker system.
This could be related, but our campus has been experiencing some power issues that do not seem to be affecting the NMR at this time. I have not noticed any problems with the system. This appears to be the only quirk with the system that I have noticed in the 1.5 years I have been watching over it.
Any comments are appreciated,
Thank you,
Margaret Smallbrock
Chemical and Instrumentation Specialist
Department of Chemistry
SD School of Mines
501 East St. Joseph Street
Rapid City, SD 57701
605-394-1236 - phone
605-394-1232 - fax
margaret.smallbrock_at_sdsmt.edu<mailto:margaret.smallbrock_at_sdsmt.edu>
Received on Tue Nov 23 2010 - 06:16:20 MST