Pfeiffer Vacuum UNO - 2 Understanding the Pumps; Main Features; Differences between the Pump Types

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2.1. Main Features
2. Understanding Pumps
2.2. Differences Between The Pump Types
Type Stage Nominal Attainable
flow rate Final Pressure
at 50 Hz (Total, without
Gasballast)
UNO 250 A one stage 267 m
3
/h < 5.0 • 10
-2
mbar
DUO 250 A two-stage 267 m
3
/h < 3.0 • 10
-3
mbar
The UNO 250 A is a single stage and the DUO 250 A is a two
stage rotary vane pump.
Special features:
– Pressurised oil lubrication
– Hydraulically controlled high vacuum safety valve
– Optional: Oil filter systems, Condensate separator,
Operational monitoring systems.
Proper Use
– Rotary Vane Vacuum Pumps may only be used to generate
vacuum.
– Installation, start-up, operating and maintenance
instructions must be observed.
– Accessories other than those named in this manual may
not be used without the agreement of Pfeiffer Vacuum.
Special Models
Helium tight model:
– Operating Fluid P3
– Leak rate < 1
• 10
-5
mbar l/s
– Additional radial shaft seal (total of 3) with sealing oil
chamber (oiler)
– Option: Special gas ballast valve for inert gas inlet (N
2
) to
prevent atmospheric air entering the system.
Korrosivgasausführung:
– Operating fluid F5
– Leak rate < 1
• 10
-5
mbar l/s
– Additional radial shaft seal (total of 3) with sealing oil
chamber (oiler)
– Vanes and sight glasses made from special materials.
– Option: Special gas ballast valve for inert gas inlet (N
2
) to
prevent atmospheric air entering the system.
Improper Use
The following are regarded as improper:
– The pumping of corrosive gases (except with corrosive
gas processes version).
– The pumping of gases which are contaminated with
particles, dust and condensate. Avoid condensation and
sublimation; take note to the vapour compatability.
– The pumping of explosive gases.
– Operating the pump in locations where there is an explosi-
on hazard.
– The Rotary Vane Vacuum Pumps may not be used for the
purpose of generating pressure.
– The pumping of liquids.
– Uses not covered above, and, in particular:
– Connection to pumps and units which is not permitted
according to their operating instructions.
– Connection to units which contain touchable and voltage
carrying parts.
Improper use will cause any rights regarding liability and
guarantees to be forfeited.
Rotary Vane Vacuum Pumps UNO 250 A, DUO 250 A
1 Vacuum flange,
2 Exhaust flange,
3 Motor,
5 Control voltage connection (for pump monitoring)
15 Casing
18 Baffle Plate
28 Support Stand
42 Operating fluid filler screw
43 Operating medium drain screw
44 Sight glass
45 Gas ballast valve, complete;
46 Screw plug
182 Pressure gauge
183 Cover for filter cleaning
205 Screw plug for adjusting the silencer
15 205 42 183 46 1 2 182 45
44 43 18 5 28 3