Siemens ET8 Series Dokumentacja Pobierz pdf (Strona 39)

Figure 2-1.-Desiccant air dryer.

After the fluid separator, the air is passed through a

telltale oil filter, which removes oil through a

combination of mechanical means and absorption. The

oil that is removed mechanically drains into a dump trap

and is discharged into a waste line as in the fluid

separator.

The oil that is absorbed causes the absorbing

material to change color from pink to deep red, starting

at the bottom, as it becomes saturated. Since the

absorbing column is in a transparent plastic tube, the

color change is visible. Before the color change reaches

the red line on the column, the absorbing material is

discarded and new material is installed.

At this point, liquid oil, liquid water, and some oil

vapor have been removed from the air. The air is, in

most cases, still saturated with water vapor and still

contaminated with oil vapor.

After passing through a pressure regulator, which

reduces the air pressure and holds it constant, the wet air

passes through the most important unit of the

system—the purifier-dehydrator. The purifier-

dehydrator performs a cleaning step by a process known

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Siemens ET8 Series Dokumentacja Strona 39