Like PSA on-site nitrogen systems oxygen generator has been used for a long time commercially. Standard models and custom designed systems are available to use for industry. Oxygen is a widely used from metal industry to glass industry, medical to wastewater treatment and fish farming. With on-site generators it is possible to produce desired amount and purity nitrogen with minimum cost without interruption. Fully automated systems can produce 90-95% purity from 1-1000 m3/h capacity even high pressures up to 200 bar.