Does anyone use this older type of freezer? I am wondering if I can use a "normal" container with LN2 adjusted by steel cap etc. as a source of nitrogen for freezer, or if it is necessary to buy a special container with regulation of pressure inside it?
Yes, I have been rig several non pressurized tanks for use in the field when we did not have a pressurized nitrogen source. you will need something similar to this:
https://www.anthonyproducts.com/store/p-271-liquid-nitrogen-withdrawal-device.aspx
We attached a compressed air feed of 10 psi into the vent hose and fitted the output to the freezer via a cryohose. You need to have at least 10 psi to adequately cool the chamber when cooling steep freezing curves. but a WARNING you must have a pressure release valve as the tanks will EXPLODE if they cannot vent excess pressure. that being said a machinist can make something suitable fairly easily for a non-pressure tank
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