Medical gases
Our specialty since 1977

The PSA process : a high technology we know perfectly

The oxygen generator is based on a patented implementation of the Pressure Swing Adsorption (PSA) which uses ambient air as raw material. 

Ambient air contains 21% oxygen, 78% nitrogen, 0.9% argon and 0.1% rare gases. The PSA process is a static separation of air gases via a specific molecular sieve designed to adsorb nitrogen under pressure, to produce oxygen-enriched air composed of 93% oxygen and above.

The oxygen generator is mainly composed of 2 separation vessels filled with molecular sieve adsorbers (zeolites), one complete pneumatic system (valves, filters, pressure regulator...) monitored by an automatic device, and an oxygen tank. 

PSA process 5 main stages  

  • 1. Compressed air (78% nitrogen, 21% oxygen, < 1% argon) is filtered, degreased and dried and the production pressure is automatically regulated.
  • 2. Air passes through the molecular sieves where nitrogen is adsorbed by the zeolite, increasing oxygen concentration up to 95%.
  • 3. Out of the molecular sieve, the oxygen produced is sent through the buffer tank via a mutifunction block. Nitrogen is released via a silent escape and forced back outside. 
  • 4.Part of the oxygen produced is used to help the nitrogen desorption of one vessel while the other ensures oxygen production (and vice versa). 
  • 5. An automatic and pneumatic vessels balance system ensure a continuous oxygen flow. 
NOVAIR S.A.S. 6, RUE PAUL LANGEVIN 93270 SEVRAN, FRANCE Tél : (+33) 01 43 84 94 83 Fax : (+33) 01 43 84 87 40