Are there different types of generators?
There are two types of generator, Membranes and Pressure Swing Absorption (PSA). PSA generators These use carbon molecular sieve (CMS), which allows the smaller molecules in the input air (such as oxygen) to penetrate the CMS, whilst the larger molecules of nitrogen bypass the CMS to generate the output gas. A PSA generator consists of a pair of columns filled with CMS. PSA generators can achieve higher purity levels than membrane systems, up to 99.9995% Membrane Generators These use a bundle of hollow fibres which separate gases by the principle of selective permeation. A membrane generator consists of these hollow fibres, encased within an outer shell of GRP. The faster permeating gases diffuse quickly through the membrane wall, leaving an output of nitrogen up to 99.9% pure. These systems are very compact and robust.
