How does a nitrogen generator work?

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How does a nitrogen generator work?
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• A Nitrogen generator manufacturer does not
  produce nitrogen when it creates nitrogen gas.
  Instead, any extra molecules like oxygen, carbon
  dioxide, or water (moisture) are removed from the
  gas inside the generator, which purifies the
  nitrogen gas in the air (around 78 of the air is
  nitrogen). Nitrogen gas can be examined after
  being removed from these additional substances. 
• Nitrogen compressor technology, which supplies
  air to a nitrogen generator system to purify,
  makes this separation process possible for either
  a membrane and other filters or a Pressure Swing
  Adsorption (PSA) system and filters. This shows
  that a Nitrogen generator manufacturers powered
  by a compressor is a stand-alone option for
  laboratories. -used the phrase integrated later
  in this essay, a suitable term to characterize
  the product's compressors. 

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• At Trident Pneumatics, we recognize the need to
  have a steady, dependable gas supply available
  around the clock. In addition, since LC-MS
  instruments require the highest levels of purity
  and performance, we closely collaborate with
  global experts in compressor technology to
  provide best-in-class compressor efficiency. 
• Through a membrane nitrogen generator, which
  compresses the air while passing it through a
  membrane made of hollow fibres with pores just
  small enough to keep nitrogen from being pushed
  through with oxygen, nitrogen gas can be
  separated from the air using an internal
  compressor. As a result, the device is left with
  a residue of high-purity nitrogen gas that is
  prepared for supply. 
• Before nitrogen gas reaches the membrane, more
  sophisticated nitrogen generators include many
  filtration steps to eliminate dust or moisture.
  The PSA technique is a method that uses a
  nitrogen compressor.  Nitrogen gas generator
  systems draws nitrogen gas from atmospheric air
  using an air compressor like a membrane nitrogen
  generator. However, a PSA nitrogen generator then
  circulates nitrogen gas down a Carbon Molecular
  Sieve (CMS) column, whose surface is covered in
  densely packed carbon granules, allowing only
  oxygen molecules to bind to the carbon material.
  Instead, the nitrogen gas molecules are filtered
  by passing through the CMS. 

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• Two CMS columns are needed for a PSA nitrogen
  generator, one of which must be depressurized
  while the other pushes pressured air through the
  sieve. Before the air enters the CMS, dust and
  moisture are removed using a multistage
  pre-filtration process that is part of PSA
  nitrogen generators. Regular compressor
  maintenance is strongly advised for systems that
  use nitrogen compressors. To maintain output
  purity and integrity, extend the generator's
  life, and ultimately safeguard a lab's
  investment, a compressor needs preventative
  maintenance once a year. To give your lab a quick
  response time in the uncommon case of a product
  issue, Peak Scientific offers industry-leading
  gas generator service plans for all Peak
  Scientific gas generators. With Trident
  Pneumatics spread out over the globe, you can be
  confident that help is always nearby and that the
  uptime of your gas generator is at its highest
  level.

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• The supply of nitrogen gas for laboratories has
  dramatically benefited from compressor-based
  generators. Nitrogen compressor-based generators
  offer labs access to nitrogen gas at a constant
  purity because membrane and PSA technologies are
  incorporated into a single generator system. 
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