Dear NMR Managers,
Recently, we started having problem with helium fill on our old (about 25 years)
500 MHz Inova. Transfer line precooling takes a little longer than before
(I think) but there is no water condensation on the line. However, from the
beginning of the transfer the pressure in the transport dewar (60 L) is high.
We try to keep it below 2 psi by setting low gas flow (about 2 L/min). I guess
because of that the fill takes very long time - about 1 hour to transfer 50-55 L.
Unfortunately, our Oxford helium level monitor does not work. We just fill-up
every 3 months.
I've been taking care of this magnet for more than 6 years and the fill was
always efficient (20-25 minutes) with gas flow set to 5 L/min (pressure 1.5-2 psi).
Transfer line vacuum was pumped last year.
Has anyone experienced such issue? Does this indicate transfer line or magnet
problem?
Thank you,
Piotr
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Received on Fri Jul 12 2024 - 09:21:13 MST