How does it works?

How does a PSA NIMOS generator work?

The new Nimos generatos can be seen as an evolution of traditional systems using the PSA principle (Pressure Swing Adsorption) which allows a constant production of Nitrogen from compressed air.
NIMOS generators are made of two or more modules with two columns. Each one is filled with high quality molecular sieves, characterized by a high porosity and therefore by an excellent selectivity.
The compressed air, which has been dried and filtered, will pass through one of the two columns ceding other gasses and water vapor to the oxygen sieves. After few seconds, before the sieves are completely saturated, the column will be depressurized in order to release the oxygen into the atmosphere.
At the same time, compressed air will be deflected to the other column, yielding oxygen until the next change.
The cycle, uninterrupted until reaching the filling of the tank, ensures a continuous nitrogen flow. When the tank reaches its maximum filling pressure, the generator, automatically, turns itself off, in standby mode, waiting for a new gas demand. 

Oxygen molecules are very small (0,28 mm), and often remain trapped in the cavities characterizing the surface of molecular sieves.
Nitrogen molecules instead, are larger (0,32 mm), and are not captured by the sieve's prorosity.