I have a couple of thoughts as well.
First, I think it’s already been mentioned, but there are several
(6-8) little holes in the blue spinner turbine on top of the shim coil that
provide the spinning gas. Make sure to poke a little piece of wire down those
to make sure they’re not blocked. If you don’t want to take
things apart to clean them out, sometimes it is sufficient to move the white
air hose over to the yellow port and turn on the sample lift—this may
blast enough air through those holes to blow any gunk out of them. After you
do that, put the hoses back where they should be.
If the assembly has been thoroughly cleaned and the sample still doesn’t
spin, sometimes the case is simply that things weren’t put together
tightly enough so there’s a gas leak. I would suggest a couple of
things:
First, disconnect the yellow gas line at the top of the BST and turn the sample
spinning on. You should feel some gas flowing from that hose. If that’s
missing, you might have to reboot the BSMS, or you might have a gas leak somewhere
in that hose. Those do get brittle after being exposed to light for a while so
breakage is not uncommon as they age.
If that’s all good, it is possible you just didn’t tighten the
shim assembly sufficiently. When you do this, make sure the lower collar on the
shim assembly (up under the bottom of the magnet, the red ring that clamps to
the bottom part of the shim coil) is loose enough that the shim coil can move
if needed. If those two rings are tight when you start tightening the screws
that connect the BST to the shim coil, it’s possible that things don’t
seal properly. If the pieces have the freedom to move you get a better seal.
With that clamping ring loosened, check that the 3 screws at the top of the BST are
tight. You don’t have to crank them down super hard because they’re
long screws and can snap—but you want to make sure you’re compressing
the o-rings that seal that connection so that the gas doesn’t just leak out.
It is also possible that one of the o-rings fell out while you had things disassembled
for cleaning. You could look around for a small red o-ring in your workspace. These
are glued in so they usually don’t come out, but sometimes the glue gets brittle.
If you’re feeling ambitious you could take the BST out again and check that
the o-rings are still where they should be.
That’s what I’ve got. I’ve cleaned spinner turbines multiple
times and frequently you don’t get them together exactly right the first time
so you have to tighten things down a bit more for the samples to spin consistently.
Cheers,
Mike
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Received on Tue Dec 12 2023 - 08:43:48 MST