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4

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 m3/h

< 5.0 

10-2 mbar

DUO 250 A

two-stage

267 m3/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 (N2) 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 (N2) 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

Содержание DUO 250 A

Страница 1: ...Rotary Vane Pumps PD 0010 BE C 0511 UNO DUO 250 A Betriebsanleitung Operating Instructions...

Страница 2: ...10 4 2 Switching The Pump ON And OFF 11 4 3 Operating The Pump With Gas Ballast Valve 11 4 3 1 Standard Model 11 4 3 2 Corrosive Gas Model 11 4 4 Pumping Off Dry Gases 12 4 5 Pumping Off Vapours 12 5...

Страница 3: ...on the pump When returning the pump to us please note the shipping instructions in Section 7 1 1 For Your Orientation Instructions in the text Operating instructions Here you have to do something Symb...

Страница 4: ...s and sight glasses made from special materials Option Special gas ballast valve for inert gas inlet N2 to prevent atmospheric air entering the system Improper Use The following are regarded as improp...

Страница 5: ...For Installation Do not carry out any unauthorised conversions or modifications on the pump Fill up with operating fluid before operating the first time included in a separate pack in the delivery co...

Страница 6: ...eve strainer from vacuum flange 1 and exhaust flange 2 Switch on pump for a short time max 3 seconds Motor motor fan must turn clockwise see arrow P on motor fan cover If direction of rotation is inco...

Страница 7: ...Current Motor Circuit The three phase motor winding consists of three identical coils Delta Connection The three coils are connected in series with the connection point connected to the mains The vol...

Страница 8: ...69 Locking screw for connecting the gas ballast valve when no valve is fitted 45 169 122 132 133 135 126 128 118 134 136 168 138 Important The instructions in 4 1 2 must be observed when working with...

Страница 9: ...pecial gas ballast valve with dosing device and hose connection for flushing gas is available on request Corrosive Gas Models Corrosive gas models are manufactured with special materials The rotor sha...

Страница 10: ...switched on 4 Operations Rotary Vane Vacuum Pumps UNO DUO 250 A 1 Vacuum flange 2 Exhaust flange 3 Motor 5 Socket for control voltage 15 Casing 28 Support stand 42 Operating fluid filler screw 43 Ope...

Страница 11: ...e Gas Model Gas ballast valve 45 is fitted with a dosing device and a flushing gas connection It has a sliding sleeve which opens the valve when pushed towards the pump and shuts the valve when pushed...

Страница 12: ...Request repair by Pfeiffer Vacuum Service Pump doesn t start Ambient temperature 12 C Warm up pump Dirty pump stages Request cleaning by Pfeiffer Vacuum Service Damaged pump stages Request repair by P...

Страница 13: ...perating fluid should be changed every 8000 h at least once a year Replacing The Operating Fluid Switch off the pump Unscrew operating fluid drain screw 43 and drain operating fluid The operating flui...

Страница 14: ...pletely clockwise Slowly open the valve spindle 47 1 2 to a complete turn until the knocking noise is no longer audible Replace locking screw 46 or operating fluid filler screw 42 paying attention to...

Страница 15: ...is dusty Dismantling and assembling the Standard Model Unscrew valve housing 68 at hexagon nut take care with the O ring 31 if necessary proceed as follows Remove circlip 59 and pull off sleeve 61 in...

Страница 16: ...e gas models 13 Silencer 14 Non return valve 28 Support stand 31 O ring 34 Cover 47 Valve spindle 48 O ring 49 O ring 50 Valve housing 51 Plate spring 52 Screw 53 O ring 54 Screw 55 Insert 56 Screw 57...

Страница 17: ...n operating fluid drain screw 43 keep an eye on the position of the O ring Allow pump to run for about 10 seconds with open vacuum flange Drain off remaining operating fluid Fill up pump with fresh op...

Страница 18: ...ation work Units which are contaminated microbiologically explo sively or radioactively cannot be accepted as a matter of principle Fill Out The Contamination Declaration In every case the Contaminati...

Страница 19: ...ity 50 Hz g h 5100 4350 60 Hz g h 6000 5200 Emission sound pressure level without gas ballast dB A 75 75 Operating fluid amount l 30 23 Max admissible operating temperature 1 C 90 90 Nominal rotation...

Страница 20: ...the full part number When ordering spare parts please state additionally the unit type and unit number see rating plate Please use this list as an order form by taking a copy Pos Description Quantity...

Страница 21: ...he repair and or service of vacuum components will only be carried out if a correctly completed declaration has been submitted Non completion will result in delay The manufacturer could refuse to acce...

Страница 22: ...the product specified below is in accordance with the provision of EU Machinery Directive 98 37 EEC EU Electromagentic Compatibility Directive 89 336 EEC and EU Low Voltage Directive 73 23 EEC Produk...

Страница 23: ...23...

Страница 24: ...49 0 64 41 8 02 2 02 info pfeiffer vacuum de www pfeiffer vacuum net Vacuum is nothing but everything to us Turbo Pumps Rotary Vane Vacuum Pumps Roots Pumps Dry Vacuum Pumps Leak Test Units Valves Fl...

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