Dear All,
This might concern only those who have a Pumped Oxford Magnet. (we have
18.8T/2.2K/63mm bore magnet; with Edwards dual RV5 pump platform)
But I hope that those who do have similar system find some time to read
through this.
As I found out from my own experience it is nearly impossible to obtain
technical information and guidance from those few
engineers who know this system. And it is quite positively impossible to get
it in the timely manner.
So I think it would be great to establish a network for those of us who
maintain a system similar to this one.
About a month and a half ago we had a small but inconvinient incident:
One of the pumps backing the Helium fridge stopped running because of a
tripped cirquit breaker inside the pump control box.
That's a minor problem - just open the box and reset the breaker. Also there
is a second backup pump - so it's not a critical problem.
The issue was that (1) pump control box manual had no troubleshooting
section nor a cirquit diagram supplied -
provided documentation did not even explain how to turn the box off and
nothing useful about the breakers.
(2) oxford magnet manual gives identical instructions for opening and
closing needle valve - an obvious mistake.
also the manual warns of possible manget quench if valve is left at wrong
setting and strongly suggests to receive proper training
before adjusting the valve.
(3) according to the magnet manual I was supposed to temporarily close that
valve in order to replace pump and I had to reset the cirquit breaker.
It took five days for the manufacturer to find the cirquit diagram for the
pump box
and I've never heard anything back about the valve.
For all that time we had no emergency backup pump so we had to closely watch
the one that was on. Since I did not have instructions on using magnet
valves,
I did not want to risk stopping pumps by doing something wrong with the pump
control box (which as I already mentioned lacked the complete manual).
That's about it.
We still don't have any instructions on how to regulate the valve
- I had one suggestion to temporarily close the ball valve without touching
the needle valve when changing pumps
- but that is not what the directions in the magnet book say. One day we
might have to regulate the fridge valve
and by then we may not be able to get any instruction at all.
So perhaps if you have a similar setup we could exchange contact information
and stay in touch just in case.
Hopefully we can close the gaps in the documentation too.
Thank you.
Evgeny.
--
Evgeny Fadeev, Ph.D.
Director, BioMolecular Spectroscopy Facility
1212 Natural Sciences 1
University of California Irvine
Irvine, CA 92697
telephone: 949-824-5842
www.physics.uci.edu/~biomolenmr <http://www.physics.uci.edu/%7Ebiomolenmr>
nmrwiki.org
Received on Fri Apr 11 2008 - 18:12:12 MST