Electronics > Projects, Designs, and Technical Stuff
Limit switches and reed switches for use in vacuum
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i_am_fubar:
Are stray magnetic fields an issue? Is this electron / ion beam based experiment?
TimFox:
Also, for 10-9 Torr, you will need bakeout.  The solid-state Hall effect switch and permanent magnets may limit the bake out temperature.
GasperSB:
@i_am_fubar nop, stray magnetic fields shouldn't be a problem...
Kleinstein:
There is still the option to use a direct mechanical contract - kind of build your own switch, especially if the switch is for low power only.
A mechanical feed through is difficult at that vacuum level anyway.
i_am_fubar:
Bellow feedthroughs are good down to -10. But pretty costly.

And stray magnetics kill spot size on low energy charges, even if fat away. Magents in the chamber could magnetise lower grade stainless and be a problem in the future. Just be mindful and if you do go down the reed switch route, use lowest strength you can get away with.

Seconded the DIY route. Will try and get some sneaky pics of our solution on Monday.
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