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www.pfeiffer-vacuum.net<br />
Filters<br />
Within certain limits, filters and separators can protect the vacuum pump against wear and<br />
corrosion. Separators that are filled with paper filter inserts (STP), Raschig rings (STR) or<br />
additionally with cyclone (STZ) bind dust. Activated carbon filters (FAK) bind inorganic vapors,<br />
and Fuller‘s earth filters (FBL) can be connected upstream for absorption of organic vapors.<br />
The fillings are replaceable. Inflowing hydrocarbons (oil vapor) can be catalytically incinerated<br />
in the heated catalytic trap (URB), and zeolite traps adsorb various vapors. When saturated,<br />
they can be regenerated by baking them out. Condensates can be collected in the condensate<br />
separator (KAS) and drained manually. Chemical oil filters (OFC) clean the pump oil<br />
with the aid of the oil pump that is integrated in the rotary vane pump.<br />
At high gas throughputs and in connection with gas ballast operation, oil mist is entrained out<br />
of the pump. 4 ml of oil loss at a throughput of 1 bar . m³ gas can be assumed. The oil vapor<br />
can be separated in an oil mist separator (ONF) and returned to the pump’s oil circulation<br />
system by means of an additional return line.<br />
<strong>How</strong>ever if substances are also displaced that chemically attack the pump oil or that have<br />
such low vapor pressure that condensation in the pump cannot be avoided, in spite of gas<br />
ballast and the above-mentioned accessories, a different type of backing pump should be<br />
selected.<br />
2.2.3 Portfolio overview<br />
Pfeiffer <strong>Vacuum</strong> rotary vane pumps are available as single- and two-stage versions.<br />
Single-Stage<br />
HenaLine <br />
Ultimate pressure: Typically 0.1 mbar<br />
Pumping speeds: 25 to 1,000 m³ / h<br />
UnoLine Plus<br />
Ultimate pressure: Typically 6 . 10 - 2 mbar<br />
Pumping speeds: 250 and 500 m³ / h<br />
Figure 2.3: Pfeiffer <strong>Vacuum</strong> rotary vane pumps<br />
Rotary Vane Pumps<br />
Two-Stage<br />
PentaLine <br />
Ultimate pressure: Typically 5 . 10 -3 mbar<br />
Pumping speeds: 11, 22 und 34 m 3 / h<br />
DuoLine <br />
Ultimate pressure: Typically 5 . 10 -3 mbar<br />
Pumping speeds: 2.5 bis 250 m 3 / h<br />
Page 31<br />
<strong>Vacuum</strong><br />
<strong>Technology</strong>
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