Gel drying pumps (was:Sequence gel fixing query..)
Dennis J. Templeton
djt2 at po.CWRU.Edu
Tue Jun 9 16:56:36 EST 1992
In a previous article, mcao at vthvax.tamu.edu () says:
>In article <1992Jun8.181537.11321 at usenet.ins.cwru.edu>, djt2 at po.CWRU.Edu (Dennis J. Templeton) writes:
>> this is the only gel dryer pump to consider. Trust me.
> We also used Savant's pump VP-100 for two more years and it gave us
>troubles sometimes due to the rusty inside the pump. You have to clean the
>pump regularly with their flush fluid to avoid the oil backs off from the pump
>into the tube. We also have the trap bottles broken several times without
>obvious reasons. They cost about 120$ apiece.
> Ming Cao
Major confusion here...
We were talking about Savants GelDrying pump (GP-100) that is teflon
lined and trouble free.
The VP-100 is a conventional high-vacuum pump that we use for a speed
vac and a make-shift lyophilizer. Overall, we have been happy with this
pump too, but if you dry gels with it you may have "conventional" problems too.
If you are getting oil back-up, I suspect a bad procedure... like shutting
off the vacuum before releasing vacuum. This can fill a speed-vac
full of oil as you return blithely to your bench.
We have not broken a trap bottle in two years of use.
Disclaimer: Savant promised to send me $20 if I wrote this ;=)
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