... consumption, which is also more flexible for controlling PSA Twin-Oxygen concentrator set (medical purpose) Principles:It uses zeolite molecular sieve as ... PSA principle. Under certain pressure, zeolite molecular sieve has different oxygen/nitrogen adsorption capacity, i.e. much more nitrogen adsorption ... 100 bar, 120bar, 150bar, 200bar and 250 bar. Twin-Oxygen concentrator set (medical purpose)