Nitrogen generator

nitrogen generator

Nitrogen generators produce nitrogen gas from compressed air and offer a cost-effective, reliable and safe alternative to traditional nitrogen gas supplies such as cylinder or liquid.

Nitrogen generators are available in 20 standard models with capacity in the range from 1 - 1800 Nm3/hour from 95% to 99.9995% purity. Oxywise PSA generators are designed for 24/7 operation. The touchscreen control has user friendly interface with automatic start/stop function based on gas consumption.

The Technology

Nitrogen Generator consist of two columns filled with carbon molecular sieve (CMS). Pre-treated compressed air enters the active column and follows up through the CMS. Oxygen and the other gases are being adsorbed while the nitrogen passes through. The active column is pressurized. When pressure is released, column becomes inactive and completely regenerate. In order to secure steady flow nitrogen generator is built from two columns; one is active while the other is inactive. At the end of cycle they switch roles.

Technical Specification

Flow rate:1 Nm3/h to 1800 Nm3/h
Purity:95% to 99.9995% (based on customer's requirements)
Dew point:less than -50°C
Operating temperature:5°C – 50°C


Standard features: 

  • Control system with SIEMENS colour touch operated panel
  • Automatic start/stop
  • Built in purity analyser for continues monitoring
  • Reliable – built for uninterrupted operation
  • Designed for dynamic pressure loading
  • Robust design, piping from Stainless Steel (AISI316)
  • Data-logging (saved on memory card)


  • Molecular sieve moisture protection 
  • GSM modem  (remote start/stop, status SMS, alarm warning SMS)
  • Flow meter with totalizer
  • Nitrogen dew point sensor
  • Temperature sensor
  • Purity and pressure control
  • Audio/visual alarm
  • Modbus TCP/IP connection
  • Remote control


Case stories

Oxywise News

An example of an indoor installation of oxygen filling station model O1FS

1. Air compressor with a build-in dryer and air tankHotter the air, the more capacity to hold water it has. Moisture deactivates the molecular sieve in the generator, therefore it has to be removed by refrigeration dryer and the drain system. The dryer is sized according to the maximum ambient temperature to make sure the pressure dew point is within the limit, +3°C or below.

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Oxywise News

What is the difference between Nm3 and Sm3?

Unfortunately neither Nm3 (normal cubic meter) or Sm3 (standard cubic meter) are complete definitions in themselves. It is essential to know the standard reference conditions of temperature and pressure to define the gas volume since there are various debates about what normal and standard should be.

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Oxywise News

What is PSA and how it works?

Generator columns are filled with molecular sieve. A product Gas is separated from clean&dry compressed air by PSA method (Pressure Swing Adsorbtion).

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