Nitrogen is denser then air, so you can have a float indicator at the rim of the unit, if the nitrogen dips to low you pump in more until the float… floats. All mechanical, no electronics needed!
Atmospheric air is mostly Nitrogen. Nitrogen from a bottle mixes readily with atmospheric air.
Sulfur hexafluoride would work a lot closer to what you are describing. Although assessing the safety of dissolving any gas into your food would require careful consideration. Also, sulfur hexafluoride is a very strong greenhouse gas, so that could easily negate any other benefits.
Nitrogen is denser then air, so you can have a float indicator at the rim of the unit, if the nitrogen dips to low you pump in more until the float… floats. All mechanical, no electronics needed!
Atmospheric air is mostly Nitrogen. Nitrogen from a bottle mixes readily with atmospheric air.
Sulfur hexafluoride would work a lot closer to what you are describing. Although assessing the safety of dissolving any gas into your food would require careful consideration. Also, sulfur hexafluoride is a very strong greenhouse gas, so that could easily negate any other benefits.