Hi Karel,
I echo everything Bob has said.
I've noticed that the boil off rate and the time takes to cool back down
after a refill will increase as you get closer to the 2-3 year mark between
services. Good reminder it's time to contact Bruker.
I fill the dewar weekly on regular magnet fill days, and I like to fill it
first. This gives the probe plenty of time to cool back down, often well
before I have even finished with the magnet, and I can release the system
back to impatient users ASAP.
Anne
________________________________
> From: main_at_ammrl.groups.io on behalf of Bob Berno via groups.io
> Sent: Friday, August 23, 2024 5:21 PM
> To: main_at_ammrl.groups.io <main_at_ammrl.groups.io>
> Subject: Re: [AMMRL] Prodigy probe
Hello Karel,
The consumption of liquid nitrogen by the Prodigy cryoprobe system will
degrade slowly over time. This is due to the fact that the transfer line
is always in use, transferring cold nitrogen gas to the cryoprobe. It is
normal to have the transfer line pumped down every 20,000 hours (about 27
months) when you have your regular 20,000 hour maintenance. After that
service, you will see the system is "good as new" and the consumption will
once again be greatly reduced.
To answer your specific questions:
What is the boil off rate for the Prodigy dewar ?
The Prodigy Dewar sits on a scale so that we can keep track of the mass of
liquid nitrogen in the Dewar. When full, we have about 79 kg. Typically,
after about a week we are down to about 30 kg. As I said before, you will
consume more on a weekly basis over time, but we have never seen the mass
get too low. In other words, I am confident that you could go 9-10 days
without too much trouble, but you could not go two weeks.
How often do you refill the dewar?
We refill the Prodigy Dewar every week. We fill many of the magnets weekly,
so it makes sense to fill the Prodigy on the same schedule.
Is weekly refilling recommended or can it go longer ?
I have already answered this above. But what I will add is that if you are
in a pinch (liquid nitrogen delivery is delayed, staff are sick or other
issues), you can certainly go an couple extra days, But this should be the
exception.
One last thing I will add: we have had a BBO Prodigy cryoprobe for about five
years now, and it has so far been performing marvellously.
For us, it is the workhorse probe that goes through the most numbers of samples,
and can do most of the general purpose experiments. When people need to do
specialized experiments, or want to do VT-NMR, then we direct them to another
spectrometer.
Cheers,
Bob.
-----Original Message-----
> From: main_at_ammrl.groups.io On Behalf Of Karel Klika via groups.io
> Sent: August 23, 2024 5:42 PM
> To: main_at_ammrl.groups.io
> Subject: [AMMRL] Prodigy probe
Dear all,
Some questions on the Prodigy probe:
What is the boil off rate for the Prodigy dewar ?
How often do you refill the dewar ?
Is weekly refilling recommended or can it go longer ?
Many thanks, will post a summary in due course.
K. Klika
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Received on Tue Aug 27 2024 - 03:42:51 MST