Hello, nice!
Are You sure the valve above the pump is vacuum tight? I guess it is ball
valve, I would look for the leaks here. Keep the rubber joints as short as
possible (try the glass tube almost touching the metal inside the hose),
that is because the rubber permits some amounts of gases inside through its
wall, search for vacuum permeability). But rubber is far better than
silicone. If You have a high vacuum grease, coat slightly the glass tube
and metal tube before joining. Did You try blanking the flanges for neon
and tube (only the pirani will be present), just to make sure the system is
leak tight?
Dalibor Farný
http://dalibor.farny.cz
sent from Samsung Galaxy Pad
Dne 28.10.2012 17:36 jb-electronics webmas...@jb-electronics.de
napsal(a):
Hi folks,
I received my needle valve yesterday and improved my vacuum system. It
works nicely: I can evacuate the system down to about 0.01 mbar and then
use the needle valve to let in well-defined amounts of Neon. I can easily
adjust the pressure inside the system in steps of 0.1mbar which is more
than sufficient. See my current setup here:
http://www.jb-electronics.de/**tmp/vacuum_system.jpghttp://www.jb-electronics.de/tmp/vacuum_system.jpg
But there are some minor leaks, mainly caused by the rubber hose
connectors that I use: I still have to figure out a proper way to connect
my 8.8mm tubing to the KF16 flange system; right now I am using an ordinary
rubber hose as seen in the picture. Does anyone know how to build or get a
proper pump union? Just like here, but with a flange adapter:
http://www.teralab.co.uk/**Glass_Blowing/Pump_Unions/**
Pump_Unions_Page1.htmhttp://www.teralab.co.uk/Glass_Blowing/Pump_Unions/Pump_Unions_Page1.htm
I do not have a lathe at my disposal. Also, the connection between the
pressure reducer and the needle valve is not optimal. Any suggestions?
Thanks
Jens
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