Pfeiffer Vacuum UnoLine UNO 35 Quick guide

Betriebsanleitung • Operating Instructions
PK 0168 BE/I (0704)
UnoLine™
DuoLine™
Rotary Vane Pumps
UNO/DUO 35/65
UNO/DUO 35/65 M
DUO 35/65 C/MC
Translation of the Original Operating Instructions

2
Table of contents
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Transport and storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4 Product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1 Product identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Construction and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.1 Setting up the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.2 Connecting the vacuum side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.3 Connecting the exhaust side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . . 10
5.5 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.6 Operations monitoring (option) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.1 Before switching on the pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.3 Pumping condensable vapours. . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
6.4 Switching off the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1 Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.2 Changing the operating fluid. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.3 Cleaning the gas ballast valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.4 Cleaning and setting the silencer . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.5 Checking the oil level in the oiler (only for C version pumps) . . . . . 23
8 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.2 Restarting the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
12 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
13 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.1 Dimension diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

3
About this manual
1 About this manual
1.1 Validity
This operating manual is for customers of Pfeiffer Vacuum. It describes the func-
tioning of the designated product and provides the most important information for
safe use of the unit. The description follows applicable EU guidelines. All informa-
tion provided in this operating manual refer to the current state of the product's de-
velopment. The documentation 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-vacuum.net.
Applicable
documents
*also available via www.pfeiffer-vacuum.net
1.2 Conventions
Safety instructions The safety instructions in Pfeiffer Vacuum operating manuals are the result of risk
evaluations and hazard analyses and are oriented on international certification
standards 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 35/65 Operating instructions
Safety information for vacuum pumps "Safety Guide" PT 0300 BN*
Declaration of Conformity Part of this document
Operating instructions for accessories (order-specifically) see section "accessories"*
DANGER
Immediate danger
Death or very severe injuries occur.
WARNING
Possible danger
Death or injuries may occur.
CAUTION
Possible danger
Medium to slight injuries may occur.
NOTE
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
ÎWork instruction: here you have to do something.
Abbreviations used C version: Corrosive gas version
M version: Version with magnetic coupling
MC version: C-Version with magnetic coupling
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 danger, the disregarding of which may result in
serious accidents.
V
G

5
Safety
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 pump to us please note the instructions in the Service sec-
tion.
The following safety instructions are only valid for the disassembly of the drive
system for a vacuum pump with a magnetic coupling:
• When disassembling the drive system from the pump housing, the strong mag-
netic field may influence the function and operational reliability of electrical and
electronic devices.
• Persons with cardiac pacemakers must keep away from the magnetic coupling.
Danger to life!
• Disassembled magnetic couplings must be kept away from computers, data sto-
rage media and other electronic components.
• Keep the disassembled components of the magnetic coupling separate at all ti-
mes. Danger of crushing!
• Do not allow any magnetised parts into the vicinity of the magnetic coupling.
Danger of injury!
2.2 Proper use
• The vacuum pump may only be used to generate a vacuum.
• Installation, operating and maintenance regulations must be complied with.
• Using accessories not mentioned in this manual is not permitted without autho-
risation from Pfeiffer Vacuum.
NOTE
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.
ÎAbsolute observe the safety information for vacuum pumps (PT 0300 BN) !
ÎThe operator is obligated to make operating personnel aware of dangers originating
from the vacuum pump, the pumped medium and the entire system.
NOTE
CE conformity
The manufacturer's declaration of conformity becomes invalid if the operator modifies
the original product or installs additional components.
ÎFollowing installation into a plant and before commissioning, the operator must
check the entire system for compliance with the valid EU directives and reassess it
accordingly.

6
Transport and storage
2.3 Improper use
Improper use will cause all claims for liability and guarantees to be forfeited. Im-
proper use is deemed to be all use for purposes deviating from those mentioned
above, especially:
• Pumping of corrosive gases (with exception of corrosiv gas versions).
• Pumping of explosive media.
• Operation of the pump 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.
• Connection to pumps or units which are not suitable for this purpose according
to their operating instructions.
• Connection to units which have touchable and voltage carrying parts.
3 Transport and storage
3.1 Transport
Transport instructions
ÎRemove the locking cap from the vacuum and exhaust flange immediately be-
fore connecting!
– Check the cone strainer, paying attention to the o-ring.
ÎUse only the crane eye on the top side of the pump to lift the pump.
Fig. 1: Transporting the pump
3.2 Storage
ÎCheck that all the openings on the pump are securely closed.
ÎStore the pump in a cool, dry place; preferably at room temperature (approx.
20°C).
– For a longer period of storage, seal the pump in a PE bag with drying agents
enclosed.
– For a period of storage longer than one year, it is recommended to carry out
maintenance and change the operating fluid.

7
Product description
4 Product description
4.1 Product identification
To ensure reliable identification of the product, always keep all of the information
on the rating plate to hand, and use it when communicating with Pfeiffer Vacuum:
• Pump model and model number
• Serial number
• Type and quantity of the operating fluid
• Date of manufacture
For motor-specific data, please see the separately installed 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 with O-ring
• Locking cap for vacuum and exhaust flange
• Operating instructions
Differences between
the pump typ
D-35641 Asslar
Mod.: DUO 65
Mod.-Nr.: PK D46 xxx
Ser.- Nr.: 3454440
S : max. 62 m /h
Oil : P3 4.2 l
Mass : 65 kg
n : 1400 1/min
(N )
2
3
max.
Made in Germany 2005/01
Pump type Pump versions
UNO/DUO 35/65 Standard version of pump
DUO 35/65 C
C version of pump; differences from the standard version:
• Operating fluid F5
• Vane material changed
• Gas ballast valve with dosable flushing gas connection
• Leak rate ≤1*10-5 mbar * l/s
UNO/DUO 35/65 M
M version of pump; differences from the standard version:
• Magnetic coupling at the pump system
• Leak rate ≤1*10-5 mbar * l/s
DUO 35/65 MC
MC version of pump; differences from the standard version:
• Operating fluid F5
• Vane material changed
• Gas ballast valve with dosable flushing gas connection
• Magnetic coupling at the pump system
• Oiler for the shaft feed through
• Leckrate ≤1*10-5 mbar * l/s

8
Product description
4.2 Construction and function
The UnoLine™/DuoLine™ pumps are oil sealed, single-/two-stage rotary vane
pumps with air cooling and pressure oil lubrication and suitable for many coarse
and fine vacuum applications. The pumps are equipped with a vacuum safety
valve that vacuum seals the vacuum chamber and vents the pump at the same time
when the pump is at a standstill. The pump version with magnetic coupling is not
subject to any mechanical wear, and is thus maintenance-free.
Fig. 3: Rotary vane pump UNO/DUO 35/65
Fig. 4: Rotary vane pump DUO 35/65 C
1 Vacuum flange
2 Exhaust flange
4 Support stand
6Casing
74 Gas ballast valve
80 Sight glass
104 Base plate
140 Operating fluid filler
screw
142 Operating fluid filler
screw
234 O-ring
236 O-ring
250 Motor
74 Gas ballast valve with
flushing gas connection
110 Oiler
104 Base plate
142 Operating fluid drain screw
236 O-ring
250 1 2 140/ 74
234
4 104 6 80 142/236
110
74

9
Installation
5 Installation
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 installation altitude 2000 m (above mean sea level)
• Permissible ambient temperature: +12 ... +40°C
• Maximum relative humidity 85%
Fig. 5: Setting up
ÎFill up with operating fluid before operating the first time (see p. 13, chap. 5.5).
– Amount and type according to rating plate
ÎAlways place the pump on a firm, even surface.
– Where stationary installation is involved, anchor the pump on site.
ÎWhen installing the pump in a closed housing, ensure there is sufficient air cir-
culation.
– Sightglass 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 Connecting the vacuum side
ÎBefore attaching the piping at the vacuum flange remove locking cap and insert
protective strainer with the respective O-ring.
ÎThe connection between the pump and the recipient should be kept as short as
possible.
– Depending on the pump type, use metallic hoses or PVC hoses with flange
connections.
– Separators, filters etc. may be installed upstream to protect the pump (see ac-
cessories). However, please observe the loss of pumping capacity due to the
conductivity of the accessories.
If a protective strainer is inserted into the intake port, the suction capacity loss is
negligible.
max. 10
°
> 35 mm

10
Installation
5.3 Connecting the exhaust side
ÎChoose 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.
ÎPiping to the pump must be suspended or supported.
– Forces from the piping system must not be allowed to act on vacuum pumps.
ÎLay 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.
5.4 Connecting to the mains power supply
Depending on the pump type, different motor versions are possible:
• Three phase motor without switch and mains cable (with 3 PTC).
• Three phase motor with switch and mains cable (without 3 PTC).
CAUTION
High pressure in the exhaust line!
Danger of damage to the seals and danger of the pump bursting.
ÎInstall the line without shut-off valves on the exhaust side.
ÎIf there is danger of a build-up of excess pressure (> 1500 mbar abs.) in the lines,
observe all official accident prevention safety regulations.
ÎIf the exhaust gases are being extracted, the exhaust pressure must be at least
250 mbar greater than the pressure at the intake side.
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.
ÎComply with the applicable regulations when working with toxic substances.
ÎOnly officially approved filter systems may be used to separate out these
substances.
CAUTION
Excess voltage!
Danger of destroying the motor.
ÎPower connections must comply with local regulations. Voltage and frequency infor-
mation given on the motor rating plate must correspond to the mains voltage and
frequency values.
ÎTo 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.
ÎSecure the motor so that it cannot be switched on while any work is being performed
on the pump.
ÎIf necessary, dismantle the pump from the installation for inspection.

11
Installation
Three phase motor Inspection of the direction of rotation
With pumps with three-phase motors is it necessary to check the direction of rota-
tion!
ÎRemove the locking cap from the exhaust flange (if existing).
ÎSwitch the pump on briefly (from 2 to 3 sec.).
– The motor and motor fan must turn in a clockwise direction (see the arrow on
the support stand).
ÎIf the direction of rotation is incorrect: Swap two phase contacts at the connec-
ting cable.
ÎFill up the operating fluid.
Motor protection
Pump motors equipped with PTC temperature sensors (3PTC) in the stator wind-
ings can be connected to a PTC resistor tripping device for protection against over-
load.
Tripping devices store the shutdown event and need to be manually switched back
on again via the integrated RESET button or via the external RESET S3. Mains-ON
is detected as an automatic RESET. Other approved motor temperature monitoring
can be used also by the operator.
ÎSet up the connections so that the directional rotation indicated on the pump is
maintained, regardless of the representations in the current flow diagram.
Fig. 6: Connection example for a three-phase AC motor with PTC resistor tripping de-
vice
NOTE
The transmission power of the pump’s magnetic coupling is so great that there
is no overload protection for the motor.
CAUTION
Operating fluids may leak out!
If the direction of rotation is incorrect, there is a danger that operating fluids may leak
at the vacuum flange.
ÎAlways check the direction of rotation before filling in operating fluid.
USControl voltage
S1OFF button
S2ON button
S3RESET button, external
K1 Contactor
F1 ... F4 Fuses
T1... T3 PTC resistor sensor
H1 Tripping indicator
M Motor, 3-phase
1)Only for devices with two
relay outputs
2) Only for MSR type
3)Only for order no.:
P 4768 051 FQ
N
L1
M
3
L2
L3
F1 - F3
K1
10 11
AC 220 ... 240 V
Us F4
UVW
S1
S2
k1
K1
H1
S3
2)
A1 A2 T1 T2 Y2Y1 24 21 22 14 1211
2) 2) 1) 1) 1)
T1...T3
3)

12
Installation
On site fuse protection with current circuit-breaker
valid for motor version
without switch/with 3PTC
Depending on the process conditions and the intake pressure, the motor can be-
come overloaded, i.e. the power input can exceed IN. In cyclical operation, it is per-
missible for the current to temporarily exceed the rated current INby 15%, provided
that the motor temperature is monitored by means of a thermistor.
Fuse protection with preset circuit-breaker in terminal box
valid for motor version
with switch/without 3PTC
Operating conditions that exceed the rated current INfor longer periods can trigger
the current circuit-breaker. In this case monitoring with a PTC temperature sensor
(3PTC) is not possible.
The Three Phase Cur-
rent Motor Circuit
Delta Connection
The three coils are connected in series with the connection point connected to the
mains. The voltage of each coil is the same as the mains voltage whereas the mains
current is the cube root of the coil current. Delta connections are denoted by the
symbol ∆. The voltage between the mains supply lines is called mains voltage. The
mains current is the current which flows in the supply lines.
Fig. 7: Motor coil and connecting plate of Delta Connection
Star Connection
The ends of the three coils are connected at the star center. The terminal voltage is
the cube root of the coil voltage; the mains and the coil current are the same. Star
connections are denoted by the symbol Y. A star connection three phase motor for
400 V mains voltage has a coil voltage of 230 V.
Fig. 8: Motor coil and connecting plate of Star Connection
W2 U1
L1
V2 V1
W1 U2
L3 L2
W2 U2 V2
U1 V1 W1
L1 L2 L3
W2
U1
L1
V2
V1
W1
U2
L3 L2
W2 U2 V2
U1 V1 W1
L1 L2 L3

13
Installation
5.5 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 suffient operating flu-
id for one filling. Pumps for special applications (e.g. for pumping corrosive gases)
can be operated 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)
• F5 (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 mbar
Filling up the
operating fluid
ÎUnscrew operating fluid filler screw.
ÎFill up operating fluid.
– Correct filling level during operations: Within the markings at the sightglass
frame.
Fig. 9: Filling up the operating fluid
ÎScrew in operating fluid filler screw 140.
ÎCheck 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.
NOTE
Guarantees relating to attainment of final pressures and trouble free functioning
of the pump apply only providing one of the permissible operating fluids is used.
max.
min.
WARNING
Toxic vapours!
Danger of poisoning when igniting and heating synthetic operating fluids (e.g. F4/F5)
above 300°C.
ÎObserve the application instructions of the operating fluid manufacturer.
ÎDo not allow operating fluid to make contact with tobacco products; observe safety
precautions when handling chemicals.

14
Installation
5.6 Operations monitoring (option)
A pressure switch can be installed on the side of the support to monitor the oil
pressure of the rotary vane pump during operations. By pressure drop and when
the pump is at rest, the contact of the pressure switch opens. The signal can be
used to control external valves:
Fig. 10: Circuit diagram, pressure switch for operating fluid monitoring
Switching voltage: 5 ... 250 Volt (potential free)
Maximum current: 2 Amp.
Protection type: IP 55
1 + 2 NO switches = open without
pressure
1
2

15
Operation
6 Operation
6.1 Before switching on the pump
ÎCheck the operating fluid level in the sightglass.
ÎCompare the voltage and frequency information on the rating plate with the
mains voltage and frequency values.
ÎCheck that the exhaust connection allows free flow (max. permissible pressure
1.5 bar absolute).
– Activate the shut-off valves in such a way that they open before or at the same
time as the pump is started.
ÎProtect the pump sufficiently from taking in contaminants by means of suitable
precautions (e.g. dust filters); if necessary, check operating fluid regularly or re-
place at shorter intervals.
6.2 Switching on the pump
The pump can be switched on in any pressure range.
No special precautions are necessary when pumping dry gases. In order to attain
the lowest possible final 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 a gas ballast (i.e. with an open gas
ballast valve).
No special precautions are necessary when pumping dry gases, provided that the
correct pump version is used with the operating fluid specified for it.
Gas ballast valve,
standard version
To avoid condensation in the pump when pumping condensable vapours, ambient
air or alternatively inertgas is periodically fed into the working chamber at the be-
ginning of the compression phase via the gas ballast valve 74.
The gas ballast valve is closed when turning to the right to position 0 and open
when turning to the left to position 1. Intermediate settings are not possible.
CAUTION
Hot surface!
Danger of burns if hot parts are touched. Depending on the operating and ambient
conditions, the surface temperature of the pump may rise above 70 °C.
ÎIn this case, use suitable finger guards.
CAUTION
Bad final vacuum and damage to the pump!
Danger of condensation and corrosion due to exceeding the water vapour compatibi-
lity (see Technical data) during operation without a gas ballast or in case of insufficient
supply of flushing gas.
ÎOnly pump vapours when the pump is warm and the gas ballast valve is open.
ÎWhen 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.

16
Operation
Fig. 11: Standard version 74 of gas ballast valve
Gas ballast valve, cor-
rosive gas version
If the pumping process requires the connection of flushing gas, the C version of the
gas ballast with the flushing gas connection must be used.
Fig. 12: Gas ballast valve, corrosive gas version
ÎConnect flushing gas at the hose nozzle of the gas ballast valve.
ÎSet flushing gas pressure; maximum pressure 1.5 bar (absolute).
– Select the type and amount of flushing gas depending on the process; consult
Pfeiffer Vacuum if necessary.
C-Version
CAUTION
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
increase.
ÎObserve the maximum permissible flushing gas pressure.
ÎSet the maximum permissible flushing gas pressure via the spindle in the gas ballast
valve or on site!

17
Operation
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 differ-
ential pressure between the exhaust side and the intake side is ≥250 mbar, then
the valve closes automatically and vents the pump when the pump is switched off.
ÎSwitch the pump off at the mains switch or disconnect from the mains in a secu-
re manner.
Venting the vacuum
chamber
Maintaining the va-
cuum in the chamber
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
ÎVent the vacuum chamber within 30 s, regardless of the chamber size.
ÎFor a longer venting process, use an additional shut-off valve and shut off the intake
line after switching off the pump.
CAUTION
Danger of backflow of operating fluid into the intake line!
Contamination of the connected vacuum system!
ÎBecause the safety valve of the pump is not suitable for longer-term sealing, install
an additional shut-off valve in the intake line.
ÎShut off the intake line immediately after switching off the pump.

18
Maintenance
7 Maintenance
7. 1 P r e c a u t i o n s
ÎAllow the pump to cool to a safe temperature.
ÎOnly dismantle the pump as far as necessary in order to repair defects.
ÎDispose of used operating fluid in compliance with local regulations.
ÎWhen using synthetic operating fluids or working with toxic substances or sub-
stances contaminated with corrosive gases, the relevant instructions governing
their use must be observed.
ÎUse only alcohol or similar agents for cleaning pump parts.
WARNING
Danger of injury from moving parts!
After power failure or motor shutdown due to overheating, the motor may restart auto-
matically.
ÎSecure the motor so that it cannot be switched on while any work is being performed
on the pump.
ÎIf 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.
ÎDecontaminate the pump before carrying out any maintenance work.
ÎIn the event of contamination, take suitable safety precautions to prevent your health
from being harmed by any dangerous substances.

19
Maintenance
Checklist for inspection,
maintenance and over-
haul
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, maintenance, repair or overhaul procedures are not performed proper-
ly. This also applies if replacement parts other than Pfeiffer Vacuum OEM replace-
ment parts are used.
7.2 Changing the operating fluid
The changing interval for the operating fluid depends on the pump applications.
ÎChange the operating fluid at least once every year.
ÎThe level of deterioration of operating fluid P3 can be read off the colour scale
in accordance with DIN 51578; request the supplementary sheet PK 0219 BN or
download it from the Internet.
ÎFill the specimen in a test tube or some similar vessel and test by holding
against the light.
ÎWhere discolouration is dark yellow to red brown (equivalent to 4 ... 5 on the sca-
le) change operating fluid.
ÎSwitch off pump.
ÎUnscrew operating fluid drain screw 142 and drain operating fluid.
Activity daily as required;
at least
annually
as
required; at
least every
2 years
as
required; at
least every
4 years
Check operating fluid level X
Visual inspection (leak-tightness/oil
leaks) X
Check filter insert of external oil mist fil-
ter (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 lubricants and the intervals
for inspection, maintenance and overhaul may be shorter than the guide values specified in
the table.Consult with Pfeiffer Vacuum Service if necessary.
NOTE
Depending on the applications, Pfeiffer Vacuum recommends determining the
exact 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.

20
Maintenance
Fig. 13: Draining the operating fluid
ÎScrew in operating fluid drain screw 142; pay attention to o-ring.
ÎAllow pump to run for a maximum of 5 seconds with the vacuum flange open.
ÎDrain off remaining operating fluid.
– In case of serious contamination, the operating fluid will have to be changed
several times (flushing):
Flushing ÎFill up with operating fluid to the middle of the sight glass.
ÎOperate the pump with the gas ballast open until the pump has warmed up.
ÎDrain the operating fluid again and check for contamination, flush again if neces-
sary.
ÎScrew the operating fluid drain screw back in.
ÎFill up with operating fluid and check the filling level (see p. 13, chap. 5.5).
142
WARNING
Hot operating fluid!
Danger of burns when draining due to contact with skin.
ÎWear suitable protective clothing.
WARNING
Operating fluid may contain toxic substances from the pumped media!
Danger of poisoning from the emission of harmful substances (radioactive, toxic, etc.)
from the operating fluid.
ÎWear suitable protective clothing and respirators.
ÎDispose of operating fluid according to the local regulations
NOTE
Request safety data sheets for operating fluids and lubricants
from Pfeiffer Vacuum or download them from the Internet.
ÎDispose of operating fluid according to the local regulations.