Nitrogen (N₂) at 97-99% purity is used to lower the oxygen concentration in cold storage rooms. Gas At Site offers two technologies to generate on-site N₂ gas, namely:
- Membrane separation
- Pressure Swing Adsorption (PSA)
Membrane technology is very robust in the lower N₂ purity range. However the industry trend is towards the use of PSA technology which is more energy efficient.