Pfeiffer Vacuum UNO 2.5 User manual

Translation of the original instructions
Operating Instructions
EN
PK 0152 BEN/P (1206)
UNO/DUO 2.5, DUO 2.5 C, UNO 5
Rotary Vane Pump

Table of contents
2
Table of contents
1 About this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Improper use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Transport and storage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Product description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.5 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.1 Before switching on the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.2 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4 Switching off the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.1 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7.2 Changing the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2 Re-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9.1 Rectifying malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11 Spare parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
13.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Declaration of conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

About this manual
3
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the functioning
of the designated product and provides the most important information for safe use of
the unit. The description follows applicable EU guidelines. All information provided in this
operating manual refer to the current state of the product's development. The documen-
tation remains valid as long as the customer does not make any changes to the product.
Up-to-date operating instructions can also be downloaded from www.pfeiffer-vacu-
um.com.
Applicable docu-
ments
*also available via www.pfeiffer-vacuum.com
For information about other certifications, if applicable, please see the signet on the prod-
uct or:
●www.tuvdotcom.com
●TUVdotCOM-ID 0000021320
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating instructions are the result of risk
evaluations and hazard analyses and are oriented on international certification stan-
dards as specified by UL, CSA, ANSI Z-535, SEMI S1, ISO 3864 and DIN 4844. In this
document, the following hazard levels and information are considered:
UNO/DUO 2.5, UNO 5, DUO 2.5 C Operating instructions
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
DANGER
Imminent danger
Indicates an imminent hazardous situation that will result in death or serious injury.
WARNING
Possibly imminent danger
Indicates an imminent hazardous situation that can result in death or serious injury.
CAUTION
Possibly imminent danger
Indicates an imminent hazardous situation that can result in minor or moderate injury.
NOTICE
Command or note
Command to perform an action or information about properties, the disregarding of
which may result in damage to the product.

4
About this manual
Pictograph
definitions
Instructions in the
text
Work instruction: here you have to do something.
Abbreviations used C version: Corrosive gas version
Symbols used The following symbols are used consistently throughout in all illustrations:
Vacuum flange
Exhaust flange
Gas ballast valve
Power connection
Prohibition of an action or activity in connection with a source of danger,
the disregarding of which may result in serious accidents
Warning of a displayed source of danger in connection with operation of
the unit or equipment
Command to perform an action or task associated with a source of dan-
ger, the disregarding of which may result in serious accidents
Important information about the product or this document
V
G

Safety
5
2 Safety
2.1 Safety precautions
●Do not expose any body parts to the vacuum.
●Observe the safety and accident prevention regulations.
●Check regularly that all safety precautions are being complied with.
●Do not carry out any unauthorised modifications or conversions to the pumps.
●Depending on the operating and ambient conditions, the surface temperature of the
pumps may rise above 70 °C. Use suitable finger guards if necessary.
●When returning the pumps to us please note the instructions in the Service section.
2.2 Proper use
●The vacuum pump may only be used to generate a vacuum.
●Installation, operating and maintenance regulations must be complied with.
●Other accessories, than those described in this manual, must not be used without the
agreement of Pfeiffer Vacuum.
2.3 Improper use
Improper use will cause all claims for liability and warranties to be forfeited. Improper use
is defined as usage for purposes deviating from those mentioned above, especially:
●pumping of corrosive gases (exception: pumps in C version)
●pumping of explosive media
●operation in potentially explosive areas
●pumping of gases containing impurities such as particles, dusts and condensate; note
the vapour compatibility levels of the pump
●pumping of substances that tend to sublime
●use of the vacuum pump to generate pressure
●pumping of liquids
●the use of operating fluids not specified by Pfeiffer Vacuum
Duty to inform
Each person involved in the installation, operation or maintenance of the vacuum pump
must read and observe the safety-related parts of these operating instructions.
The operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
Installation and operation of accessories
Pfeiffer Vacuum pumps can be equipped with a series of adapted accessories. The in-
stallation, operation and maintenance of connected devices are described in detail in
the operating instructions of the individual components.
For information on order numbers of components, see "Accessories".
Use original accessory parts only.
NOTICE
CE conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
Following installation into a plant and before commissioning, the operator must check
the entire system for compliance with the valid EU directives and reassess it accor-
dingly.

6
Transport and storage
●connection to pumps or units which are not suitable for this purpose according to their
operating instructions
●connection to units which have exposed voltage-carrying parts
3 Transport and storage
3.1 Transport
Transport instructions
Remove the locking cap from the vacuum and exhaust flange immediately before con-
necting!
– Check the cone strainer, paying attention to the O-ring.
Use only the handle on the top side of the pump to lift the pump.
Fig. 1: Transporting the pump
3.2 Storage
Check that all the openings on the pump are securely closed.
Store the pump in a cool, dry place; preferably at temperatures between -10 °C and
+40 °C.
– For a longer period of storage, seal the pump in a PE bag with drying agents en-
closed.
– For a period of storage longer than two years, it is recommended to change the op-
erating fluid before using the pump.
1
0

Product description
7
4 Product description
4.1 Product identification
To correctly identify the product when communicating with Pfeiffer Vacuum, always have
the information from the rating plate available.
●Pump model and model number
●Type and amount of operating fluid
●Date of manufacture
Please find the voltage range and motor-related data on the separately attached motor
rating plate.
Fig. 2: Product identification on the rating plate
Scope of delivery ●Pump with motor (power cord/power switch --> dependent on the motor type)
●Operating fluid P3 (for standard pump)
●Cone strainer and centering ring/centering ring with nozzle with O-rings
●Locking cap for vacuum and exhaust flange
●Operating instructions
Differences between
the pump versions
D-35641 Asslar
Mod.: DUO 2.5
Mod.-Nr.: PK D31 XXX D
Ser.- Nr.: 3454440
S : max. XX m /h
Oil : P3 X.X l
Mass : XX kg
n : XXXX 1/min
(N )
2
3
max.
Made in Germany 2005/01
Pump type Pump versions
UNO 5, UNO 2.5 Standard version of pump
●Centering ring at the exhaust flange
DUO 2.5 Standard version of pump
●Centering ring with nozzle at the exhaust flange
DUO 2.5 C C version of pump; differences from the standard version:
●Operating fluid F4
●Gas ballast valve with dosable flushing gas connection
●Vane material different
●Leak rate ≤1*10-5 hPa * l/s

8
Installation
4.2 Function
Vacuum pumps of the UNO/DUO series are oil-sealed, single-/two-stage rotary vane
vacuum pumps. The vacuum pumps are equipped with a high vacuum safety valve that
vacuum seals the vacuum chamber and vents the pump at the same time when the pump
is at standstill.
Fig. 3: UNO/DUO 2.5 Rotary Vane Pump
5Installation
5.1 Setting up the pump
Installation location Observe the following requirements when setting up the pump:
●Note the load-bearing capacity of the mounting surface
●Maximum angle of inclination 10° to each side
●Maximum erection height 2000 m N.N.
●Permissible ambient temperature: +12 ... +40°C
●Maximum relative humidity 85%
Fig. 4: Setting up
1 Vacuum flange
2 Exhaust flange
6 Motor
6.1 Power switch
7 Gas ballast valve
9Casing
13 Sight glass
48 O-ring
49 O-ring
86 Operating fluid drain screw
87 Operating fluid filler screw
1 2 6.148/87
49/86 13 9 7 6
V
G
max. 10˚
1
0
DN 16 ISO-KF

Installation
9
Fill up with operating fluid before operating the first time (see p. 9, chap. 5.2).
– Amount and type according to rating plate
Always place the pump on a firm, even surface.
Where stationary installation is involved, anchor the pump on site; if necessary, ex-
change the base for one with mounting holes (on request).
When installing the pump in a closed housing, ensure there is sufficient air circulation.
– Sight glass and gas ballast valve must be visible and readily accessible.
– Voltage and frequency information given on the motor rating plate must be visible.
5.2 Filling up the operating fluid
The type and amount of operating fluid should be visible on the pump's rating plate for
every rotary vane pump.
The delivery consignment for the standard pump contains sufficient operating fluid for
one filling. Pumps for special applications (e.g. for pumping corrosive gases) can be op-
erated with other operating fluids. These must be defined in accordance with Pfeiffer
Vacuum specifications before initial assembly and ordered separately.
Permissible operating fluids
●P3 (Standard operating fluid)
●F4 (Operating fluid for corrosive gas versions)
●D1 (for special applications and higher operating temperature)
– Final pressure of measurement, depending on the type of gas: < 5 ·10-2 hPa
Filling up the operat-
ing fluid
Unscrew operating fluid filler screw 87.
Fill up operating fluid;
– correct filling level during operations: within the markings at the sight glass frame.
Fig. 5: Filling up the operating fluid
Screw in operating fluid filler screw 87.
Check operating fluid level only when the pump is warm and running; close
– vacuum flange and gas ballast valve to do so,
– Check operating fluid daily in non-stop operation, otherwise whenever the pump is
switched on. Refilling is possible when the pump is in final vacuum operation.
NOTICE
Use approved operating fluids only!
The use of operating fluids that have not been approved by Pfeiffer Vacuum shall result
in a limited warranty. In such cases, it is not possible to guarantee that product-specific
performance data will be achieved.
Prior consultation is required before using other application-specific operating fluids.
max.
min.
13
87

10
Installation
5.3 Connecting the vacuum side
Remove locking cap from the vacuum flange;
– pay attention to the cone strainer and the respective O-ring in the intake port.
The connection between the pump and the vacuum chamber should be kept as short
as possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange con-
nections.
– Separators, filters etc. may be installed upstream to protect the pump (see acces-
sories). However, please observe the loss of pumping capacity due to the conduc-
tivity of the accessories.
5.4 Connecting the exhaust side
Before attaching the piping at the exhaust flange remove locking cap and insert cen-
tering ring/centering ring with nozzle with the respective O-rings.
Choose the cross-section of the exhaust line to be at least the size of the nominal
connection diameter of the vacuum pump's exhaust connection.
Piping to the pump must be suspended or supported.
– Physical forces from the piping system must not be allowed to act on vacuum
pumps.
WARNING
Toxic vapours!
Danger of poisoning when igniting and heating synthetic operating fluids (e.g. F4/F5)
above 300°C.
Observe the application instructions.
Do not allow operating fluid to make contact with tobacco products; observe safety
precautions when handling chemicals.
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
Install the line without shut-off valves on the exhaust side.
If there is danger of a build-up of excess pressure (> 1500 hPa abs.) in the lines, ob-
serve all official accident prevention safety regulations.
If the exhaust gases are being extracted, the exhaust pressure must be at least
250 hPa greater than the pressure at the intake side.
5 Cone strainer
32 Centering ring/Centering ring with nozzle
105 O-ring
107 O-ring
105
5
32
107

Installation
11
Lay piping from the pump sloping downward so that no condensate can flow back into
the pump; otherwise fit a condensate separator.
– If an air trap is created in the system, then a device for draining condensation water
must be provided at the lowest point.
5.5 Connecting to the mains power supply
Single phase motors The vacuum pumps are fitted with a built-in thermal protection switch. Depending on the
type of pump, different motor versions with a power cord are possible:
Fig. 6: Motor circuit diagram with switch
WARNING
Emission of toxic substances from the exhaust!
Danger of poisoning from emitted gases or vapours, which can be detrimental to health
and/or can pollute the environment, depending on the particular application.
Comply with the applicable regulations when working with toxic substances.
Only officially approved filter systems may be used to separate and remove these
substances.
NOTICE
Excess voltage!
Danger of destroying the motor.
Power connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and fre-
quency values.
To protect the motor and supply cable in case of malfunction, mains fuse protection
must be implemented.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
Secure the motor so that it cannot be switched on while any work is being performed
on the pump.
If necessary, dismantle the pump from the installation for inspection.

12
Installation
Changing the voltage range
Only valid for pumps with reversible motor:
The mains voltage must be determined on-site each time before the pump is installed
or moved to a different location.
Disconnect the pump from the power supply.
Set the desired voltage range on the voltage selector switch using a suitable screw-
driver.
Fuse protection
To protect the motor in case of malfunction, carry out fuse protection in accordance
with the regional regulations.
– Select a fuse with slow characteristics.
0
1
11 5
230
11 5
230
Switch position: "115" "230"
Voltage ranges: 115 V ±10%, 50/60 Hz, 230 V ±10%, 50/60 Hz
NOTICE
Overvoltage!
An incorrect voltage range setting can damage the motor.
Disconnect the pump from the power supply.
Only change the voltage range when the pump is disconnected from the power
mains.
Motor voltage
[V] Frequency [Hz] Nominal cur- rent [A] Recommended fuse, slow [A] Cable/plug version
95 ... 105
100 ... 115
50
60
3.2
3.8
6
6
with 2 m cable, Japanese plug und UL certificate (only for wind-
ing insulation)
100 ... 105
110 ... 130
50
60
3.2
3.6
6
6
with 2 m cable, USA plug and UL certificate (for motor)
190 ... 210
200 ... 220
50
60
1.6
2
4
4
with 2 m cable, without plug and UL certificate (for motor)
220 ... 240
220 ... 240
50
60
1.4
1.8
4
4
with 2 m cable and three-pin plug
115/230
115/230
50
60
2.8/1.4
3.6/1.8
6/4
6/4
with 2 m cable, without plug with UL certificate for motor (motor
switchable)

Operation
13
6 Operation
6.1 Before switching on the pump
Check the operating fluid level in the sight glass.
Compare the voltage and frequency information on the rating plate with the mains volt-
age and frequency values.
Check that the exhaust connection allows free flow (max. permissible pressure 150
kPa absolute).
– Activate the shut-off valves in such a way that they open before or at the same time
as the pump is started.
Protect the pump sufficiently from taking in contaminants by means of suitable precau-
tions (e.g. dust filters); if necessary, check operating fluid regularly or replace at short-
er intervals.
6.2 Switching on
The pump can be switched on in any pressure range between atmospheric and
ultimate pressure.
No special precautions are necessary when pumping dry gases. In order to attain the
lowest possible ultimate pressures, the gas ballast valve should be closed.
6.3 Pumping condensable vapours
Should the process gases contain condensable gases present at high percentages, the
rotary vane pump must be operated with gas ballast (i.e. with an open gas ballast valve).
Gas ballast valve,
standard version To avoid condensation in the pump when pumping condensable vapours, air is periodi-
cally fed into the working chamber at the beginning of the compression phase via the gas
ballast valve 7.
The gas ballast valve is closed when turning to the right to position 0 and open when turn-
ing to the left to position 1. Intermediate settings are not possible.
Fig. 7: Standard version of gas ballast valve
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient con-
ditions, the surface temperature of the pump may rise above 70 °C.
In this case, use suitable finger guards.
NOTICE
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibility
during operation without gas ballast or in case of insufficient supply of flushing gas.
Only pump vapours when the pump is warm and the gas ballast valve is open.
When the process has been completed, allow the pump to continue running for
about 30 minutes with the vacuum flange closed and the gas ballast open for ope-
rating fluid regeneration purposes.
1
1
1
0
0
0
1
0
geschlossen
closed
geöffnet
open

14
Operation
Gas ballast valve,
corrosive gas version If the pumping process requires the connection of flushing gas, the C version of the gas
ballast valve with the flushing gas connection must be used.
Fig. 8: Corrosive gas version of gas ballast valve
Connect flushing gas at the flushing gas connection 7.4.
Set flushing gas pressure; maximum pressure 120 kPa (absolute).
– Select the type and amount of flushing gas depending on the process; consult Pfei-
ffer Vacuum if necessary.
Use the proportioning screw 7.3 to set the desired amount of gas.
– Closed when fully turned to the right; open when fully turned to the left.
Gasballastvalve with
solenoid valve To control the flow of the flushing gas externally, an electromagnetic valve can also be
used as an alternative to the versions described above. The valve makes it easier to op-
erate the gas ballast and allows clean air or other gas to be let in in a process-controlled
manner.
7.1 O-ring
7.2 O-ring
7.3 Proportioning screw
7.4 Flushing gas connection (for DN 6 mm
hose)
7. 1
7. 3
7. 4
7. 2
NOTICE
Flushing gas pressure higher than allowed endangers the operational reliability
of the pump.
The power input of the pump, the temperature and the ejection of operating fluid will in-
crease.
Observe the maximum permissible flushing gas pressure of 150 kPa (absolute).
Set the amount of flushing gas on site; dosing is not possible when using a solenoid
valve!

Operation
15
Fig. 9: Assembling the solenoid valve at the gas ballast inlet
Performance data of the solenoid valve
2/2 way valve closed when disconnected
Supply voltage 24 VDC, +/- 10 %
Power input 4 W
Socket Type 2506
Threaded connection of flushing
gas
1/8" inside
Flushing gas pressure max. 150 kPa (absolute)
Amount of flushing gas max. 180 l/h

16
Maintenance
6.4 Switching off the pump
The pump can be switched off in any pressure range.
Rotary vane pumps have an integrated safety valve on the intake side. If the differential
pressure between the exhaust side and the intake side is ≥250 hPa, then the valve clos-
es automatically and vents the pump when the pump is switched off.
Switch the pump off at the mains switch or disconnect from the mains in a secure man-
ner.
Venting the vacuum
chamber
Maintaining the vac-
uum in the chamber
7 Maintenance
7.1 Precautions
NOTICE
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
Vent the vacuum chamber within 30 s, regardless of the chamber size.
For a longer venting process, use an additional shut-off valve and shut off the intake
line after switching off the pump.
NOTICE
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
Because the safety valve of the pump is not suitable for longer-term sealing, install
an additional shut-off valve in the intake line.
Shut off the intake line immediately after switching off the pump.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
Secure the motor so that it cannot be switched on while any work is being performed
on the pump.
If necessary, dismantle the pump from the installation for inspection.
WARNING
Pump parts may be contaminated from pumped media!
Danger of poisoning due to contact with harmful substances.
Decontaminate the pump before carrying out any maintenance work.
In the event of contamination, take suitable safety precautions to prevent your health
from being harmed by any dangerous substances.

Maintenance
17
Turn off the vacuum pump, vent to atmospheric pressure and allow to cool, if neces-
sary.
Disconnect the drive motor from the mains and secure it so that it cannot be switched
on.
Only dismantle the pump as far as necessary in order to repair defects.
Dispose of used operating fluid in compliance with local regulations.
When using synthetic operating fluids or working with toxic substances or substances
contaminated with corrosive gases, the relevant instructions governing their use must
be observed.
Use only alcohol or similar agents for cleaning pump parts.
Checklist for inspec-
tion, maintenance
and overhaul
Certain repair and overhaul work should only be performed by Pfeiffer Vacuum Service
(PV). Pfeiffer Vacuum will be released from all warranty and liability claims if the required
intervals for inspection, maintenance, or overhaul are exceeded or inspection, mainte-
nance, repair or overhaul procedures are not performed properly. This also applies if re-
placement parts other than Pfeiffer Vacuum OEM replacement parts are used.
Activity daily as required;
at least annu-
ally
as required;
at least ev-
ery 2 years
as required;
at least ev-
ery 4 years
Check operating fluid level X
Visual inspection (leak-tightness/oil leaks) X
Check filter insert of external oil mist filter (if
existent)
X
Change filter insert of external oil mist filter (if
existent)
X
Change operating fluid X
Change oil filter (if existent) X
Cleaning the pump and renew the seals X
Clean gas ballast valve and silencer X
Clean the motor fan cap X
Replace radial shaft seal X (PV)
Clean or change vacuum safety valve X (PV)
Clean or change exhaust valves X (PV)
Change vanes X (PV)
Check or change coupling X (PV)
Depending on the process, the required replacement intervals for the operating fluid and the intervals
for inspection, maintenance and overhaul may be shorter than the guide values specified in the table.
Consult Pfeiffer Vacuum Service, if necessary.

18
Maintenance
7.2 Changing the operating fluid
The changing interval for the operating fluid depends on the pump applications, but
should be carried out once a year.
The level of deterioration of operating fluid P3 can be determined for clean processes
with the colour scale (in accordance with DIN 51578); supplementary sheet PK 0219
BN on request or download it from the Internet.
Suck off operating fluid from the pump through the operating fluid filler opening.
Fill the specimen in a test tube or some similar vessel and test by holding against the
light.
Where discolouration is red brown (equivalent to 5 on the scale) change operating flu-
id.
Switch off the pump.
Unscrew operating fluid filler screw 87.
Unscrew operating fluid drain screw 86.
Fig. 10: Draining the operating fluid
Screw in operating fluid drain screw 86; pay attention to O-ring.
Screw in operating fluid filler screw 87.
Allow pump to run for a maximum of 5 seconds with the vacuum flange open.
Depending on the applications, Pfeiffer Vacuum recommends determining the ex-
act service life of the operating fluid during the first year of operation.
The replacement interval may vary from the guide value specified by Pfeiffer Vacuum
depending on the thermal and chemical loads, and the accumulation of suspended par-
ticles and condensation in the operating fluid.
86
87
WARNING
Hot operating fluid!
Danger of burns when draining due to contact with skin.
Wear suitable protective clothing.
Use a suitable collecting vessel.
WARNING
Operating fluid may contain toxic substances from the pumped media!
Danger of poisoning from the emission of harmful substances from the operating fluid.
Wear suitable protective clothing and respirators.
Dispose of operating fluid according to the local regulations

Maintenance
19
Drain off remaining operating fluid.
– In case of serious contamination, the operating fluid will have to be changed sev-
eral times (flushing):
Flushing Fill up with operating fluid to the middle of the sight glass.
Operate the pump with the gas ballast open until the pump has warmed up.
Drain the operating fluid again and check for contamination, flush again if necessary.
Screw the operating fluid drain screw back in.
Fill up with operating fluid and check the filling level (see p. 9, chap. 5.2).
Request safety data sheets for operating fluids and lubricants
from Pfeiffer Vacuum or download them from the Internet.
Dispose of operating fluid according to the local regulations.

20
Decommissioning
8 Decommissioning
8.1 Shutting down for longer periods
Before shutting down the pump, observe the following procedure and adequately protect
the pump system against corrosion:
Switch off pump.
Change operating fluid.
Start the pump and allow the pump to warm up.
Switch off the pump.
Fill up the pump with new operating fluid to the top edge of the sight glass.
Close vacuum flange and exhaust flange with locking caps.
Store the pump in a cool, dry place; preferably at temperatures between -10 °C and
+40 °C.
– For a longer period of storage, seal the pump in a PE bag with drying agents en-
closed.
– For a period of storage longer than two years, it is recommended to change the op-
erating fluid before using the pump.
Do not store pump in the vicinity of machines, lanes, etc., because strong vibrations
can damage the rotor bearings.
8.2 Re-starting
8.3 Disposal
Products or parts thereof (mechanical and electrical components, operating fluids, etc.)
may cause environmental burden.
Safely dispose of the materials according to the locally applicable regulations.
Emission of operating fluid!
Danger of the operating fluid being emitted at the exhaust flange if overfilled.
Drain the operating fluid to the normal level before restarting the pump.
NOTICE
Re-starting
The serviceability of the operating fluid without operation is a maximum of 2 years. Be-
fore restarting after a shut-down of 2 years or longer, carry out the following work.
Replace the operating fluid.
Replace the radial shaft sealing rings and further elastomer parts.
Replace bearings at pumps with anti-friction bearings.
Follow the maintenance instructions and inform Pfeiffer Vacuum.