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yeah that argon idea is solid, hell, you could just put the rig in a big glass bowl, and fill it with argon, itll be like filling a tub with water, only the argon will force the air out :)
no need to seal the box or get any crazy other expensive stuff :)
How long can you run on 50L of Ln2?
I am not sure but will the argon force the humidity out? It's not the air that hurts you, it's the humidity. Nah, never mind, Argon is heavier than H2O so I don't think there will be any problems. The idea should work...
FYI a big "bottle" of Argon (like the 6 feet metal ones in the hospitals that contain oxygen), filled with Argon 200bar pressure will set you back 150euros for the high purity one (99.999%). The normal one will be a lot cheaper, provided of course you return the metal canister, and you dont buy that too.