Hi Friends,
I met a problem about Detecting Helium Level in our old Bruker 300 Solid State NMR. This helium level detection was still right before I filled Liquid Helium two weeks ago. After I filled LHe(two weeks ago), Helium Level still did not change(60%). I think that Helium level should be 100%, because I obviously saw the liquid drop from the outlet pipe and a large amount of white fog. Then I had to deice it several times, the helium Level shows 72%. During the past two weeks, the helium level gradually decreased from 72% to 66%. This means the sensor is not frozen. Whether the sensor need to be calibrated again? Or the helium level is true? Or other possibility?
Thanks for your help.
Best regards,
Qi Zhao
qzhao_at_tulane.edu
2005-06-20
Received on Tue Jun 21 2005 - 17:52:14 MST