Dear Paul,
On 13/02/11 00:02, paul swed wrote:
Well indeed Magnus the black stuff and silver blob were rb.
300 degrees F for 15 minutes made it all go away.
I was using a j thermocouple to measure the temp and right at the bulb.
The trick seems to be for a FRS c to get the blob to the lowest point of the
capsule thats observable. I did this with the normal RB power system heated
to 177 degrees. Gently tapped a few times to get it concentrated.
Then powered off and let it cool.
Next step hung the assembly from a lamp so the heat gun could be pointed
straight up to boil the RB off at 300 degrees for 10 minutes and let it go
for 5 more for good luck.
The dark area on the capsule is significantly reduced and no trace of the
silver blob.
I had mine go greyish on the first heat-up, but then I cleared it on the
second run.
During the heating I could actually see the silver blob shrink.
The RB lamp lights well and looks good.
Now to try reassembling everything. That will be a job.
Good news!
Eager to hear of lock-up results!
It seems like the normal temperature of the bulb is good for keeping it
lit, but you need to go further up for the clean-up operation. Maybe
this is why the grey rubidium-coating didn't rub off for others... they
didn't go high enough. Still, no extreme temperatures is needed to get
the job done.
Cheers,
Magnus
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