Pfeiffer Vacuum UNO 20 User manual

Betriebsanleitung • Operating Instructions
PD0023BE/F (0809)
Rotary Vane Pumps
UNO 20
UNO 60/UNO 90

2
Table of contents
Table of contents
1 Preliminary remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 Design 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5.4 Connecting to the mains power supply . . . . . . . . . . . . . . . . . . . . . 10
5.5 Filling up the operating fluid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.1 Before switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6.2 Switching on the pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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 Changing the operating fluid filter . . . . . . . . . . . . . . . . . . . . . . . . . 21
7.4 Changing the exhaust filter in the operating fluid separator . . . . . . 21
7.5 Cleaning the operating fluid return line . . . . . . . . . . . . . . . . . . . . . 23
7.6 Changing the intake filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.7 Changing the gas ballast filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8 Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.1 Shutting down for longer periods . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.2 Re-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9 Malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9.1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10 Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
11 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
11.1 Spare parts packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
12 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
13 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
13.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Konformitätserklärung 34

3
Preliminary remarks
1 Preliminary remarks
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 docu-
ments
*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 20/60/90 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
Preliminary remarks
Pictograph definiti-
ons
Instructions in the
text
ÎWork instruction: here you have to do something.
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
2Safety
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 sec-
tion.
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 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.
• 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 exposed voltage-carrying parts.
• The operation of the devices in potentially radioactive areas.
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.
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
3 Transport and storage
3.1 Transport
Transport instructions
ÎRemove the locking cap from the vacuum flange immediately before connec-
ting!
– Check the protective strainer, paying attention to the o-ring.
ÎUse only the crane eye sideways at the operating fluid separator 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 correctly identify the product when communicating with Pfeiffer Vacuum, al-
ways have the information from the rating plate available and use it:
• Pump model and model number
• Serial 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.
Scope of delivery • Pump with motor and power cord (only for pumps with single phase motor)
• Operating fluid D1 (for standard pump)
• Centering ring with O-ring
• Locking cap for vacuum flange
• Operating instructions
Differences between
the pump type Pump type Pump versions
UNO 20 Standard version of pump
• Gasballast valve with hose connection
UNO 60 Standard version of pump
• Operating fluid return unit with float valve
UNO 90
Standard version of pumpg
• Operating fluid return unit with float valve
• Operating fluid cooler

8
Product description
4.2 Design and function
The UnoLine™ series pumps are oil-sealed, single stage operating rotary vane
pumps with air cooling and circulatory lubrication. A vacuum safety valve in the
intake flange closes the intake line automatically and prevents operating fluid back-
streaming when the pump is switched off. The outlet is via an operating fluid sep-
arator (ONF) with integrated oil mist filter. In addition there is a filter in the operat-
ing fluid separator, which cleans the operating fluid (dependent on the pump mod-
el).
The pumps can also be used for the purpose of generating centralized vacuum in
hospitals. The standard UnoLine™ pumps have been designed for non-stop or in-
termittent operations.
Fig. 2: UNO 20
Fig. 3: UNO 60 / UNO 90
1 Vacuum flange
2Exhaust
6 Pump casing
74 Gas ballast valve
75 Operating fluid separator
80 Sight glass
140 Operating fluid filler
screw
250 Motor
290 Operating fluid return
unit
1 Vacuum flange
2 Exhaust
6 Pump casing
74 Gas ballast valve
74.4 Gas ballast filter
75 Operating fluid separator
80 Sight glass
140 Operating fluid filler
screw
200 Manometer
250 Motor
270 Operating fluid cooler
(only for UNO 90)
290 Operating fluid return
unit
2 75 1 140 250
80 290 74 6
2 75 74 140 200 74.4 1 250
80 290 6 270

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%
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
ÎRemove locking cap from the vacuum flange;
– pay attention to the cone strainer and the respective O-ring in the intake port.
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.
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.
– Physical 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.
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.

10
Installation
5.4 Connecting to the mains power supply
Depending on the pump type, different motor versions are possible:
• Single phase motor for fixed voltage with a built-in thermal protection switch
and connecting cable.
• Three phase motor with a built-in thermal protection switch (without switch and
mains cable).
Single phase motors The single phase motors are fitted with a built-in thermal protection switch.
Fig. 4: Connection diagram with thermal protection switch (terminal box)
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 and remove 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.
3
2
1
Z
1
2
U
2
U
1
Z
1
~

11
Installation
Three-phase motors 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.
Diagram für star/delta connection
Fig. 5: Connection diagram with thermal protection switch (terminal box)
Thermal motor protection, provided by customer
The three-phase motors are fitted with a built-in thermal protection switch.
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.
1234
W
3
2U2V2
U1W1 V1
~
1234
W
3
2U2V2
U1W1 V1
~

12
Installation
Fig. 6: Thermal motor protection, provided by customer
Motor overload protection, provided by customer
Fig. 7: Motor overload protection, provided by customer
Nominal voltage:
250 V, 50/60 Hz
Nominal current:
2,5 A (cos ϕ=1)
1,6 A (cos ϕ=0,6)
(contact opens at excess temperature)
L
1
F
1
A
2
A
1
U
1
V
1
W
1
T
1
T
1
13 5
U
13
24 6 14
L
2
L
3
NPE
0
I
t
L1
U1V1W1T1T1
L2
L3
N
PE
t
I> I> I>

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 sufficient operating
fluid for one filling. The use of other operating fluids requires prior authorisation
from Pfeiffer Vacuum.
Permissible operating fluid
• D1 (standard operating fluid)
• Operating fluid for special applications on request
Filling up the opera-
ting fluid
ÎUnscrew operating fluid filler screw.
ÎFill up operating fluid.
– Correct filling level during operations: Middle of sight glass 80.
Fig. 8: 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 a permissible operating fluid is used.
140
80

14
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.
ÎSwitch on the pump with the vacuum flange closed and allow to warm up for 15
minutes.
Permissible Opera-
ting Conditions
Operating fluid return
via float valve at UNO
60 / UNO 90
The pumps are fitted with an automated operating fluid return system via intake
flange 1 as standard. If the fluid level in the operating fluid separator 75 reaches a
definite level, the float valve returns collected operating fluid to the pump via oil
return line 290 by means of differential pressure. As the float valve only opens tem-
porarily there is no important decline of the final pressure.
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.
Type / Version Intake pressure for contin-
uous operation
Intake pressure for intermit-
ted operation1
1. For interval evacuation and venting of a vessel, start the pump motor maximum
once per minute only.
UNO 20
Version with operating fluid
return line via the pum-
ping system
400 ... 1 mbar
unlimited
400 ... 1 mbar
unlimited
UNO 60
UNO 90
Version with operating fluid
return line via intake flange
< 600 mbar
unlimited < 600 mbar

15
Operation
Fig. 9: Float valve 190
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. In order to attain
the lowest possible final pressures, the gas ballast valve should be closed.
Gas ballast valve,
standard version
To avoid condensation in the pump when pumping condensable vapours, air is pe-
riodically fed into the working chamber at the beginning 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.
75 Operating fluid separator
190.1 Cover
190.2 Lever
190.3 Float valve
190.4 Seal I
190.5 Seal II
290 Operating fluid return line
290.3 Screw
190.3
75
190.2
190.5
290.3
190.4
290
190.1
NOTE
The oil return only works properly if the working pressure is in the following
range: < 400 mbar for UNO 20 and < 600 mbar for UNO 60/UNO 90.
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. 10: Gas ballast valve for UNO 60 UNO 90
Fig. 11: Gas ballast valve UNO 20
74Gas b all ast val ve
74.1 Operating fluid return line
74.2 Gas ballast casing
74.4 Gas ballast filter
74 Gas ballast valve
74.5 Gas ballast nozzle
74.2
74
"1"
"0" 74.4
74.1
"0"
"1"
74.5
74

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 Precautions
ÎSwitch off the pump, vent it to atmospheric pressure and let it cool down.
ÎDisconnect the drive motor from the mains and secure it so that it cannot be
switched on.
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.
NOTE
Service work should be carried out by qualified personal only!
Pfeiffer Vacuum is not liable for any damage to the pump resulting from work carried
out improperly.
ÎTake advantage of our service training programs; additional information at
www.pfeiffer-vacuum.net.
ÎPlease state all the information on the pump rating plate when ordering spare parts.

19
Maintenance
Check list für inspections, 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, 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,
but should be carried out once a year.
ÎSwitch off the pump.
ÎUnscrew operating fluid drain screw 142 and drain operating fluid.
– Assess the condition of the operating fluid by its colour. Fresh operating fluid
D1 is golden yellow, used operating fluid is dark brown down to black.
Activity daily as required; at least once every 6 months 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 the saturation of the exhaust air
filter (internal oil mist filter) X
Change operating fluid X
Change operating fluid filter X
Change the exhaust air filter X
Cleaning the pump and renew the o-
rings X
Clean gas ballast valve X
Clean the fan cap of the motor X
Replace the radial shaft seals1
1. Where unusually high levels of operating fluid are being lost it is necessary to carry
out a check of the radial shaft seals. If operating fluid leaks out from under the pump
between the pump casing and the motor or fan, the radial shaft seals should be
replaced. In this case please get in touch with your local Pfeiffer Vacuum Service.
X (PV)
Clean or replace discharge valves X (PV)
Replace vanes X (PV)
Replace vacuum safety valve 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. 12: 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 (siehe S. 13, Kap. 5.5).
142
WARNING
Hot operating fluid!
Danger of burns when draining due to contact with skin.
ÎWear suitable protective clothing.
ÎUse 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.
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.