User guide

nano-porous systems Ltd
17-100-0100 7
2. Technical description
The n-psl dryer uses the pressure swing adsorption principle of drying
compressed air, utilising two identical columns each containing a hygroscopic
desiccant bed.
Wet air enters the dryer through the
inlet valve and is directed into one of
the columns.
• Each column contains a unique
(patented) desiccant cartridge.
• Bulk liquids and particles are
removed by the filtration stage
on the inlet to the cartridge.
• Water is retained in a collection
chamber until the column is
regenerated (Vented to
atmosphere as the column is
depressurised).
• Air then passes through the
desiccant bed where any
remaining moisture is adsorbed.
• The dry air passes out through
the final particulate
(<1micron/ISO8573.1 Class 2).
• Simultaneously, a small amount of dry filtered air is counter flowed down through
the other cartridge and exhausted to atmosphere. Removing the moisture and
regenerating the desiccant bed.
• The dryer controller periodically switches columns after top end repressurisation;
ensuring a continuous supply of dry air at constant pressure.
The dryer can also be controlled using a Zero Volt signal from the compressor.
This energy saving mode (eco) senses when the compressor is switched off and
stops the dryer operation until the compressor restarts.
Figure 2: Dryer section