Pfeiffer Vacuum DUO 11 ATEX User manual

OPERATING INSTRUCTIONS
EN
Translation of the Original
DUO 11 ATEX
Rotary vane pump

Dear Customer,
Thank you for choosing a Pfeiffer Vacuum product. Your new rotary vane pump is designed
to support you by its performance, its perfect operation and without interfering your individual
application. The name Pfeiffer Vacuum stands for high-quality vacuum technology, a
comprehensive and complete range of top-quality products and first-class service. With this
expertise, we have acquired a multitude of skills contributing to an efficient and secure
implementation of our product.
Knowing that our product must not interfere with your actual work, we are convinced that our
product offers you the solution that supports you in the effective and trouble-free execution of
your individual application.
Please read these operating instructions before putting your product into operation for the
first time. If you have any questions or suggestions, please feel free to contact info@pfeiffer-
vacuum.de.
Further operating instructions from Pfeiffer Vacuum can be found in the Download Center on
our website.
Disclaimer of liability
These operating instructions describe all models and variants of your product. Note that your
product may not be equipped with all features described in this document. Pfeiffer Vacuum
constantly adapts its products to the latest state of the art without prior notice. Please take
into account that online operating instructions can deviate from the printed operating
instructions supplied with your product.
Furthermore, Pfeiffer Vacuum assumes no responsibility or liability for damage resulting from
the use of the product that contradicts its proper use or is explicitly defined as foreseeable
misuse.
Copyright
This document is the intellectual property of Pfeiffer Vacuum and all contents of this
document are protected by copyright. They may not be copied, altered, reproduced or
published without the prior written permission of Pfeiffer Vacuum.
We reserve the right to make changes to the technical data and information in this document.
2/58

Table of contents
1 About this manual 7
1.1 Validity 7
1.1.1 Applicable documents 7
1.1.2 Variants 7
1.2 Target group 7
1.3 Conventions 7
1.3.1 Instructions in the text 7
1.3.2 Pictographs 8
1.3.3 Stickers on the product 8
1.3.4 Abbreviations 9
2 Safety 10
2.1 General safety information 10
2.2 Safety instructions 10
2.3 Safety precautions 15
2.4 ATEX classification and safety measures 15
2.4.1 Labeling of the vacuum pump 15
2.4.2 Potential hazards 16
2.4.3 Safety measures 17
2.5 Product usage limits 18
2.6 Proper use 18
2.7 Foreseeable improper use 19
2.8 Personnel qualification 19
2.8.1 Ensuring personnel qualification 19
2.8.2 Personnel qualification for maintenance and repair 20
2.8.3 Advanced training with Pfeiffer Vacuum 20
3 Product description 21
3.1 Function 21
3.2 Operating principle 22
3.3 Scope of delivery 22
3.4 Identifying the product 22
4 Transportation and Storage 23
4.1 Transporting the vacuum pump 23
4.2 Storing the vacuum pump 24
5 Installation 25
5.1 Installing the vacuum pump 25
5.2 Connecting the vacuum side 25
5.3 Connecting the exhaust side 26
5.4 Grounding the vacuum pump 27
5.5 Establishing mains connection 28
5.5.1 Choosing the cable bushing 29
5.5.2 Connect three phase motor with 6-pin terminal board 29
5.5.3 Selecting on-site fuse protection 30
5.5.4 Connecting the PTC thermistor tripping unit 30
5.5.5 Checking the direction of rotation 31
5.6 Filling the operating fluid 31
6 Operation 33
6.1 Putting the vacuum pump into operation 33
6.2 Switching on the vacuum pump 33
6.3 Operating the vacuum pump with inert gas 34
6.4 Refilling operating fluid 36
6.5 Switching off the vacuum pump 36
Table of contents
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7 Maintenance 38
7.1 Maintenance instructions 38
7.2 Checklist for inspection and maintenance 39
7.3 Changing the operating fluid 40
7.3.1 Determine degree of aging of P3 operating fluid 41
7.3.2 Draining the operating fluid 41
7.3.3 Rinsing and cleaning the rotary vane vacuum pump 42
7.4 Cleaning the inert gas valve 44
8 Decommissioning 45
8.1 Decommissioning the vacuum pump for longer periods 45
8.2 Recommissioning 45
9 Recycling and disposal 46
9.1 General disposal information 46
9.2 Dispose of rotary vane pump 46
10 Malfunctions 47
11 Service solutions by Pfeiffer Vacuum 49
12 Spare parts 51
12.1 Maintenance kit 1 – maintenance level 1 51
12.2 Maintenance kit 2 – maintenance level 2, cleaning and dismantling 52
12.3 Overhaul kit – Maintenance level 3 52
12.4 Coupling set for versions with magnetic coupling 52
12.5 Set of vanes 52
13 Accessories 53
13.1 Accessory information 53
13.2 Ordering accessories 53
14 Technical data and dimensions 54
14.1 General 54
14.2 Substances in contact with the media 54
14.3 Technical data 55
14.4 Dimensions 55
Declaration of conformity 57
Table of contents
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List of tables
Tbl. 1: Stickers on the product 8
Tbl. 2: Abbreviations used in this document 9
Tbl. 3: ATEX designations 16
Tbl. 4: Potential hazards 17
Tbl. 5: Measures and safety equipment 17
Tbl. 6: Permissible ambient and operating conditions 18
Tbl. 7: Current values for fuse layout 30
Tbl. 8: Maintenance intervals 40
Tbl. 9: Troubleshooting for rotary vane pumps 48
Tbl. 10: Spare parts pack Duo 11 ATEX 51
Tbl. 11: Content of maintenance kit 1 51
Tbl. 12: Ordering accessories 53
Tbl. 13: Consumables 53
Tbl. 14: Conversion table: Pressure units 54
Tbl. 15: Conversion table: Units for gas throughput 54
Tbl. 16: Materials that make contact with the process media 54
Tbl. 17: Technical data Duo 11 ATEX 55
List of tables
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List of figures
Fig. 1: Position of the labels on the product 9
Fig. 2: Design, construction 21
Fig. 3: Rotary vane vacuum pump functional principle 22
Fig. 4: Lifting and transporting the vacuum pump 24
Fig. 5: Minimum distances 25
Fig. 6: Vacuum connection with flange connection 26
Fig. 7: Exhaust connection with flange connection 27
Fig. 8: Connecting the grounding cable 28
Fig. 9: Delta connection for low voltage 29
Fig. 10: Star circuit for high voltage 29
Fig. 11: Connection example with PTC thermistor tripping unit 31
Fig. 12: Filling the operating fluid 32
Fig. 13: Gas ballast valve with inert gas connection 35
Fig. 14: Filling the operating fluid 36
Fig. 15: Draining the operating fluid 42
Fig. 16: Removing/fitting the cap 43
Fig. 17: Valve with inert gas connection 44
Fig. 18: Content of maintenance kit 1 – maintenance level 1 51
Fig. 19: Dimension diagram Duo 11 ATEX 56
List of figures
6/58

1 About this manual
IMPORTANT
Read carefully before use.
Keep the manual for future consultation.
1.1 Validity
This operating instructions is a customer document of Pfeiffer Vacuum. The operating instructions de-
scribe the functions of the named product and provide the most important information for the safe use of
the device. The description is written in accordance with the valid directives. The information in this op-
erating instructions refers to the product's current development status. The document shall remain valid
provided that the customer does not make any changes to the product.
1.1.1 Applicable documents
Designation Number
Declaration of conformity A component of these instructions
Operating instructions for the motor Refer to motor terminal box
Declaration of Conformity for the motor Motor supplier
Accessories operating instructions Refer to Accessories
1.1.2 Variants
Pump type Pump version
Duo 11 ATEX Version with magnetic coupling
1.2 Target group
These operating instructions are aimed at all persons performing the following activities on the product:
●Transportation
●Setup (Installation)
●Usage and operation
●Decommissioning
●Maintenance and cleaning
●Storage or disposal
The work described in this document is only permitted to be performed by persons with the appropriate
technical qualifications (expert personnel) or who have received the relevant training from Pfeiffer Vac-
uum.
1.3 Conventions
1.3.1 Instructions in the text
Usage instructions in the document follow a general structure that is complete in itself. The required ac-
tion is indicated by an individual step or multi-part action steps.
Individual action step
A horizontal, solid triangle indicates the only step in an action.
►This is an individual action step.
Sequence of multi-part action steps
The numerical list indicates an action with multiple necessary steps.
1. Step 1
2. Step 2
3. ...
About this manual
7/58

1.3.2 Pictographs
Pictographs used in the document indicate useful information.
Note
Tip
1.3.3 Stickers on the product
This section describes all the stickers on the product along with their meaning.
Mod. DUO 11 ATEX
P/N PK D59 905 C
S/N 23679713
Oil P3 0.5 l
S(N2) max. 10.5 m /h
n max. 3600 1/min
Mass 15.3 kg
3
Made in Germany 2019/02
D-35641 Asslar
VACUUM
II 3/3G Ex h IIC T4 Gc X
+12 °C T +40 °C
a
≤ ≤
Rating plate
The rating plate of the rotary vane pump is located on the front right-
hand side next to the sight glass.
Motor rating plate (not shown)
The motor rating plate is located on the respective motor.
ACHTUNG!
Vor dem Einfüllen des Öles Drehrichtung der
Pumpe prüfen!
ATTENTION!
Before filling in the oil check direction of
rotation of the pump!
ATTENTION!
Avant remplir l’huile vérifier le sense de rotation
de la pompe!
Sticker (yellow)
Attention! Check the direction of rotation of the rotary vane pump be-
fore filling with operating fluid.
Vor Inbetriebnahme Pumpe mit Öl
füllen
Fill the pump with oil before putting
into operation
Remplir la pompe d’huile avant la mise
en route
Sticker (red)
Fill the rotary vane pump with operating fluid before commissioning.
Arrow indicating direction of rotation
The direction of rotation arrow indicates the required motor rotation di-
rection.
warranty seal
Closure seal
The product is sealed ex-factory. Damaging or removing a closure seal
results in loss of the warranty.
Warning hot surface
This sticker warns of injuries caused by high temperatures in case of
touching without protection during operation.
Tbl. 1: Stickers on the product
About this manual
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6
7
1
23
45
Fig. 1: Position of the labels on the product
1 Rating plate of the rotary vane vacuum pump 5 Motor rating plate
2 Attention! Check the direction of rotation of the rotary vane pump
before filling with operating fluid 6 Arrow indicating direction of rotation
3 Fill rotary vane pump with operating fluid before commissioning 7 Closure seal
4 Hot surface warning sign
1.3.4 Abbreviations
Abbreviation Explanation
BA Operating instructions
DN Nominal diameter (from the French: diamètre nominal)
ISO International Organization for Standardization
abs. Absolute
DIN German Institute for Standardization (Deutsches Institut für Normung)
INRated (nominal) current
Imax Maximum current
FKM Fluoropolymer rubber
M version Version with magnetic coupling
PTC Temperature-dependent resistor (Positive Temperature Coefficient)
PE Earthed conductor (protective earth)
OME Oil mist filter (Oil Mist Eliminator)
ODK Oil return flow line (Oil Drain Kit)
WAF width across flats
MM Maintenance manual
Tbl. 2: Abbreviations used in this document
About this manual
9/58

2 Safety
2.1 General safety information
The following 4 risk levels and 1 information level are taken into account in this document.
DANGER
Immediately pending danger
Indicates an immediately pending danger that will result in death or serious injury if not observed.
►Instructions to avoid the danger situation
WARNING
Potential pending danger
Indicates a pending danger that could result in death or serious injury if not observed.
►Instructions to avoid the danger situation
CAUTION
Potential pending danger
Indicates a pending danger that could result in minor injuries if not observed.
►Instructions to avoid the danger situation
NOTICE
Danger of damage to property
Is used to highlight actions that are not associated with personal injury.
►Instructions to avoid damage to property
Notes, tips or examples indicate important information about the product or about this docu-
ment.
2.2 Safety instructions
All safety instructions in this document are based on the results of the risk assessment carried out in
accordance with Machinery Directive 2006/42/EC Annex I and EN ISO 12100 Section 5. Where applica-
ble, all life cycle phases of the product were taken into account.
Risks during transport
DANGER
Risk of explosion from electrostatic charging during transport
There is a risk of fatalities when transporting packaging material (foil) and plastic containers in poten-
tially explosive areas. Ignition can cause very serious injuries, and even fatalities.
►Only unpack the vacuum pump outside of potentially explosive areas.
DANGER
Risk of explosion when carrying out installation and maintenance work in potentially explo-
sive areas
There is a risk of explosion if unsuitable tools are used in potentially explosive areas. Ignition can
cause very serious injuries.
►Transport, installation and maintenance work may not be performed in potentially explosive at-
mospheres.
►Always shut down the vacuum pump before commencing any work.
Safety
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WARNING
Risk of serious injury from swinging, toppling or falling objects
During transport, there is a risk of crushing and impact on swinging, toppling or falling objects. There
is a risk of injuries to limbs, up to and including bone fractures and head injuries.
►Secure the danger zone if necessary.
►Pay attention to the center of gravity of the load during transport.
►Ensure even movements and moderate speeds.
►Observe safe handling of the transport devices.
►Avoid sloping attachment aids.
►Never stack products.
►Wear protective equipment, e.g. safety shoes.
Risks during installation
DANGER
Danger to life from electric shock
Touching exposed and voltage-bearing elements generates an electric shock. Incorrect connection of
the mains supply leads to the risk of live housing parts that can be touched. There is a risk to life.
►Before the installation, check that the connection leads are voltage-free.
►Make sure that electrical installations are only carried out by qualified electricians.
►Provide adequate grounding for the device.
►After connection work, carry out an earthed conductor check.
WARNING
Risk of fatalities due to escaping process media
The manufacturer has no influence on the media being supplied with the vacuum pump. Process me-
dia are often toxic, combustible, potentially explosive and/or reactive in other ways. There is a risk of
serious or even fatal injuries if these media are permitted to leak into the atmosphere.
►Refer to the corresponding local guidelines. This information can be obtained from the Depart-
ment of Health and Safety at Work of the user.
►Prevent zone entrainment.
►Connect the pump outlet to the suction system for hazardous media on the system.
►Perform regular inspections to ensure that there are no leaks at the connection between vacuum
pump and suction pipes.
WARNING
Risk of explosion at increased winding temperature in potentially explosive atmospheres
If the winding temperature of the motor is not monitored, the motor winding could potentially become
a source of ignition. There is a risk of explosion, and consequently the risk of sustaining serious inju-
ries.
►Always establish the connections directed into the motor terminal boxes with a corresponding
PTC thermistor tripping unit of an intrinsically safe electric circuit, suitable for the potentially ex-
plosive area.
–Otherwise, the tripping unit must be installed outside of the potentially explosive area.
CAUTION
Danger of injury from bursting as a result of high pressure in the exhaust line
Faulty or inadequate exhaust pipes lead to dangerous situations, e.g. increased exhaust pressure.
There is a danger of bursting. Injuries caused by flying fragments, the escaping of high pressure, and
damage to the unit cannot be excluded.
►Route the exhaust line without shut-off units.
►Observe the permissible pressures and pressure differentials for the product.
►Check the function of the exhaust line on a regular basis.
Safety
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CAUTION
Risk of injury from entrapment of body parts
During installation and maintenance, the motor may start up uncontrolled. There is a risk of minor in-
jury to fingers and hands (e.g. hematoma), from direct contact with the vacuum flange.
►Maintain sufficient distance to the vacuum flange during all work.
►Safely connect the motor to the mains during installation.
►Safely disconnect the motor from the mains prior to maintenance.
►Secure the motor against re-start.
CAUTION
Property damage from intake of solid particles
During commissioning, there is a risk of damage to the suction chamber from dirt from the system or
the pipes.
►Always use the cone sieve included in delivery in the intake flange.
►Ensure that the cone sieve is also installed at all times during installation.
Risks during operation
WARNING
Risk of explosion in the medium to be pumped as a result of increased pressure
With installation on the exhaust side, there is a risk of the exhaust pressure of the vacuum pump ex-
ceeding the atmospheric conditions. The ignition temperature of the medium to be pumped is lowered
in the suction chamber.
If the ignition temperature of the medium to be pumped falls below a temperature of +135 °C, there is
a risk of explosion, and consequently serious injury.
►Ensure that the ignition temperatures of the medium to be pumped is maintained above a tem-
perature of +135 °C at 2000 hPa abs.
WARNING
Danger of poisoning due to toxic process media escaping from the exhaust pipe
During operation with no exhaust line, the vacuum pump allows exhaust gases and vapors to escape
freely into the air. There is a risk of injury and fatality due to poisoning in processes with toxic process
media.
►Observe the pertinent regulations for handling toxic process media.
►Safely purge toxic process media via an exhaust line.
►Use appropriate filter equipment to separate toxic process media.
WARNING
Risk of injury from reactive, potentially explosive or otherwise hazardous gas/air mixtures
Uncontrolled gas inlet of air or gases containing oxygen may lead to the formation of potentially ex-
plosive gas/air mixtures in the vacuum system. Ignition can cause very serious injuries.
►Use inert gases only for the supply of ballast gas in order to prevent the formation of a potentially
explosive atmosphere.
►Ensure a closed inert gas system in order to avoid zone entrainment as a result of process gas
entering into the inert gas line.
WARNING
Risk of injury from reactive, potentially explosive or otherwise hazardous gas/air mixtures
Uncontrolled exchange of gases when opening the housing could potentially generate a potentially
explosive mixture of gas and air in the vacuum system or even outside of the vacuum pump. Ignition
can cause very serious injuries.
►Respect segregation of the zones when filling the operating fluid.
Safety
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WARNING
Danger of injury from impermissibly high inert gas pressure
Increased inert gas pressure compromises the operational reliability due to increasing power con-
sumption of the vacuum pump and potentially causes the temperature class threshold to be exceed-
ed. There is a danger of bursting if there is a potentially explosive atmosphere. This leads to injuries
caused by flying fragments, the escaping of high pressure, and damage to the unit.
►Observe the maximum permissible inert gas pressure of 1200 hPa (absolute).
►Dose the inert gas quantity with the dosing screw on the gas ballast valve or on site.
CAUTION
Risk of injury from entrapment of body parts
During installation and maintenance, the motor may start up uncontrolled. There is a risk of minor in-
jury to fingers and hands (e.g. hematoma), from direct contact with the vacuum flange.
►Maintain sufficient distance to the vacuum flange during all work.
►Safely connect the motor to the mains during installation.
►Safely disconnect the motor from the mains prior to maintenance.
►Secure the motor against re-start.
CAUTION
Danger of injury from bursting as a result of high pressure in the exhaust line
Faulty or inadequate exhaust pipes lead to dangerous situations, e.g. increased exhaust pressure.
There is a danger of bursting. Injuries caused by flying fragments, the escaping of high pressure, and
damage to the unit cannot be excluded.
►Route the exhaust line without shut-off units.
►Observe the permissible pressures and pressure differentials for the product.
►Check the function of the exhaust line on a regular basis.
CAUTION
Danger of burns on hot surfaces
Depending on the operating and ambient conditions, the surface temperature of the vacuum pump
can increase to above 70 °C.
►Provide suitable touch protection.
Risks during maintenance, decommissioning and in event of malfunctions
DANGER
Risk of explosion when carrying out installation and maintenance work in potentially explo-
sive areas
There is a risk of explosion if unsuitable tools are used in potentially explosive areas. Ignition can
cause very serious injuries.
►Transport, installation and maintenance work may not be performed in potentially explosive at-
mospheres.
►Always shut down the vacuum pump before commencing any work.
DANGER
Risk of explosion from electrostatic charging during transport
There is a risk of fatalities when transporting packaging material (foil) and plastic containers in poten-
tially explosive areas. Ignition can cause very serious injuries, and even fatalities.
►Only unpack the vacuum pump outside of potentially explosive areas.
Safety
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WARNING
Health hazard through poisoning from toxic contaminated components or devices
Toxic process media result in contamination of devices or parts of them. During maintenance work,
there is a risk to health from contact with these poisonous substances. Illegal disposal of toxic sub-
stances causes environmental damage.
►Take suitable safety precautions and prevent health hazards or environmental pollution by toxic
process media.
►Decontaminate affected parts before carrying out maintenance work.
►Wear protective equipment.
WARNING
Danger of injury from strong magnetic field
There is a risk of injury for people with pacemakers and medical implants.
►Make sure that such individuals do not enter the sphere of influence (≤ 2 m) of the magnetic field.
►Identify rooms in which magnetic couplings are openly accessible with the symbol: "No access
for people with pacemakers".
►Always keep disassembled couplings away from computers, data carriers, and other electronic
components.
WARNING
Health hazard and risk of environmental damage from toxic contaminated operating fluid
Toxic process media can cause operating fluid contamination. When changing the operating fluid,
there is a health hazard due to contact with poisonous substances. Illegal disposal of toxic substan-
ces causes environmental damage.
►Wear suitable personal protective equipment when handling these media.
►Dispose of the operating fluid according to locally applicable regulations.
CAUTION
Risk of injury from entrapment of body parts
During installation and maintenance, the motor may start up uncontrolled. There is a risk of minor in-
jury to fingers and hands (e.g. hematoma), from direct contact with the vacuum flange.
►Maintain sufficient distance to the vacuum flange during all work.
►Safely connect the motor to the mains during installation.
►Safely disconnect the motor from the mains prior to maintenance.
►Secure the motor against re-start.
CAUTION
Scalding from hot operating fluid
Danger of burns when draining operating fluid if it comes into contact with the skin.
►Wear protective equipment.
►Use a suitable collection vessel.
CAUTION
Danger of burns on hot surfaces
In the event of a fault, the surface temperature of the vacuum pump can increase to above 105 °C.
►Allow the vacuum pump to cool down before carrying out any work.
►Wear personal protective equipment if necessary.
Safety
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2.3 Safety precautions
Duty to provide information on potential dangers
The product holder or user is obliged to make all operating personnel aware of dangers
posed by this product.
Every person who is involved in the installation, operation or maintenance of the product
must read, understand and adhere to the safety-related parts of this document.
Infringement of conformity due to modifications to the product
The Declaration of Conformity from the manufacturer is no longer valid if the operator
changes the original product or installs additional equipment.
●Following the installation into a system, the operator is required to check and re-evalu-
ate the conformity of the overall system in the context of the relevant European Direc-
tives, before commissioning that system.
General safety precautions when handling the product
►Observe all applicable safety and accident prevention regulations.
►Check that all safety measures are observed at regular intervals.
►Do not expose body parts to the vacuum.
►Always ensure a secure connection to the earthed conductor (PE).
►Never disconnect plug connections during operation.
►Observe the above shutdown procedures.
►Keep lines and cables away from hot surfaces (> 70 °C).
►Never fill or operate the unit with cleaning agents or cleaning agent residues.
►Do not carry out your own conversions or modifications on the unit.
►Observe the unit protection class prior to installation or operation in other environments.
►Provide suitable touch protection, if the surface temperature exceeds 70 °C.
2.4 ATEX classification and safety measures
Vacuum pumps of the ATEX series are specially designed and manufactured to comply with the re-
quirements of Directive 2014/34/EU regarding the proper use of equipment and protective systems in
potentially explosive areas. The vacuum pumps are delivered with an ATEX-certified motor and are
designated as follows:
●II 3/3G Ex h IIC T4 Gc X +12 °C ≤ Ta ≤ +40 °C
2.4.1 Labeling of the vacuum pump
Classifica-
tion
Description
Device
group Devices which can be used for applications in potentially explosive atmospheres are divided into two groups:
Device group I: Devices for mines susceptible to firedamp (will not be discussed in
any more detail here)
Device group II: Devices for all other potentially explosive areas with the exception of
underground operations in mines and their surface installations which are susceptible
to hazardous firedamp and / or combustible dust.
Device cate-
gory Device group II is divided into three categories which vary in their respective degree of safety.
Devices of Device category 1 are designed to guarantee an extremely high degree
of safety. They must guarantee the necessary degree of safety even if malfunctions
occur only rarely on the device.
Devices of Device category 2 are designed to guarantee a high degree of safety.
They must guarantee the necessary degree of safety even with regular occurrences
of malfunctions or fault conditions which are generally to be expected.
Devices of Device category 3 are designed to guarantee a normal degree of safety.
They guarantee the necessary degree of safety for normal operation.
Safety
15/58

Classifica-
tion
Description
Combustible
materials G: Gases or vapors
D: Dust (will not be discussed in any more detail here)
Note: The device may only be used in atmospheres susceptible to explosion
due to gases or vapors. Operation in dust-charged, potentially explosive atmos-
pheres is not permitted.
Type of pro-
tection Identification code “Ex h” designated in the standard DIN EN ISO 80079-36 for non- electrical equipment. A protection type established for electrical equipment is not
used.
Explosion
groups Gases and vapors are divided into three Explosion groups based on their particular ignition capability (IIA, IIB and IIC). The ignition power in this regard decreases from
Explosion group IIA to IIC. (The higher Explosion group, e.g. IIC incorporates the re-
spectively lower IIB and IIA).
Temperature
class Classification of equipment depending on their maximum surface temperature, in ac- cordance with assignment as follows:
Temperature class --> Maximum surface temperature/gas temperature:
● T1 --> +450 °C
● T2 --> +300 °C
● T3 --> +200 °C
● T4 --> +135 °C
● T5 --> +100 °C
● T6 --> +85 °C
The temperature class and the actual maximum surface temperature of the equip-
ment includes a safety margin to the minimum ignition temperature of the potentially
explosive atmospheres as stipulated in DIN EN ISO 80079-36.
EPL accord-
ing to
EN 60079
Equipment protection level
EPL Ga: Equipment with “extremely high” protection level for use in potentially explo-
sive gas atmospheres in which no risk of ignition exists during normal operation, with
foreseeable or infrequent faults/malfunctions.
EPL Gb: Equipment with “high” protection level for use in potentially explosive gas at-
mospheres in which no risk of ignition exists during normal operation, with foreseea-
ble faults/malfunctions.
EPL Gc: Equipment with “extended” protection level for use in potentially explosive
gas atmospheres in which no risk of ignition exists during normal operation.
X Special operating conditions must be observed! Special conditions and notes in the
operating instructions apply.
Ta Permissible ambient temperature for operation of the vacuum pump prescribed on the
rating plate.
Tbl. 3: ATEX designations
2.4.2 Potential hazards
The ignition hazard assessment for the Duo 11 ATEX was performed in accordance with the harmon-
ized standard ISO 80079-36 (Non-electrical equipment for explosive atmospheres - Basic method and
requirements). This assessment includes the identification of hazards described as follows which will
not occur if the system is operated properly with the respective safety measures.
Potential
hazard
Occurrence due to Safety measures
Hot surfa-
ces Heat generated as a re- sult of friction and com-
pression in the pumping
system, and in particular
at increased intake pres-
sure
Operating fluid dissipates the heat which is produced in
the inside of the rotary vane pump on the components
cooled by convection. The installation conditions must be
observed.
Hot gases Compression of the re-
quired gases The gas temperatures were determined during tests car- ried out under permissible application conditions. Observe
the information in the operating manual.
Mechanical
sparks No mechanical sparks will be produced during
normal operation with
normal use of the system
Surfaces on the inside of the rotary vane pump are wetted
with operating fluid to cool them.
Safety
16/58

Potential
hazard
Occurrence due to Safety measures
Electrical
sparks Electric motor Application of an explosion-proof electric motor. Observe the labeling (refer to rating plate) of the electric motor and
the operating instructions.
Static elec-
tricity Rotary vane pump is not earthed Rotary vane pump is to be integrated in the equipotential bonding at the installation site. Static charging from insu-
lating coats of paint can be excluded as the rotary vane
pump is not painted.
Chemical
reaction Reaction between proc- ess gas and operating
fluid
To be assessed by the user.
Zone en-
trainment Leaking rotary vane pump/system Rotary vane pump undergoes a final inspection with heli- um leak test within the framework of a production control
(leakage rate < 1 × 10-8 Pa m3/s).
Tbl. 4: Potential hazards
2.4.3 Safety measures
The following information must be observed or appropriate measures implemented if reliable operation
of the rotary vane pump is to be guaranteed:
Measures/safety equipment Speci-
fica-
tion
We
recom-
mend
Oil pres-
sure Monitoring of oil pressure with oil pressure switch (optional):
● Falling below the switch-point will cause a malfunction of the
vacuum safety valve.
● Exceeding the switch-point could indicate an overload of the
magnetic coupling.
X
Exhaust
pressure Monitoring of the exhaust pressure with pressure switch (optional) to protect the rotary vane pump against overload. X
Operating
fluid tem-
perature
Monitoring of the operating fluid temperature with temperature sen-
sor (optional):
● A deviation from the normal value could be indicative of a fault.
X
Operating
fluid level Monitoring of the operating fluid level with level switch (optional):
● If the fill level falls below the "Min" mark, opening of the
change-over contact can be used as a signal to switch off the
rotary vane pump.
X
Motor wind-
ing temper-
ature
Connect the temperature sensor in the motor terminal box on the
PTC thermistor tripping unit (see chapter “Connecting the PTC
thermistor tripping unit”, page 30) as prescribed in the motor op-
erating instructions.
X
Tbl. 5: Measures and safety equipment
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2.5 Product usage limits
Parameter Duo 11 ATEX
Installation location ● Indoors, protected against:
─ dust deposits
─ falling objects
─ fire-fighting water
● Outdoors, protected against:
─ falling objects
─ direct influence of weather such as rain, splash water,
strong drafts and sunlight
─ fire-fighting water
─ lightning strike
Installation altitude max. 1000 m above sea level
At installation heights > 1000 m above sea level, the rated pow-
er of the motor must be reduced or the ambient temperature
limited due to increased heating of the vacuum pump.
Constant intake pressure ≤ 50 hPa
Tank size for pumping out atmos-
pheric pressure max. 100 liters
Cycle operation Operating duration > downtime, cycle > 20 mins
Exhaust pressure of the vacuum
pump ≤ 1500 hPa abs.
Exhaust pressure at OME max. atmospheric pressure
Ambient temperature +12 °C to +40 °C
Relative air humidity ≤ 85 %
Installation surface flatness Horizontal
Intake temperature of medium to
be pumped ≤ 40 °C
Operation with gas ballast Only permissible with inert gas: ≤ 1200 hPa abs.
Tbl. 6: Permissible ambient and operating conditions
WARNING
Risk of explosion in the medium to be pumped as a result of increased pressure
With installation on the exhaust side, there is a risk of the exhaust pressure of the vacuum pump ex-
ceeding the atmospheric conditions. The ignition temperature of the medium to be pumped is lowered
in the suction chamber.
If the ignition temperature of the medium to be pumped falls below a temperature of +135 °C, there is
a risk of explosion, and consequently serious injury.
►Ensure that the ignition temperatures of the medium to be pumped is maintained above a tem-
perature of +135 °C at 2000 hPa abs.
Inspection of media by the user
Testing with ambient air as the medium to be pumped has shown that if the aforementioned ambient
and operating conditions are maintained, the maximum surface and gas temperatures do not exceed a
value of +130 °C.
With the utilization of dry media being pumped, heating of the pump could become more intense. Ap-
propriate measures are to be implemented to prevent this heating, for example reducing the permanent
intake pressure.
1. Check whether the thermal behavior of the media being pumped deviates from the behavior of the
ambient air.
2. Ensure suitable countermeasures wherever the difference to the ignition temperature is reduced.
2.6 Proper use
►Use the vacuum pump for vacuum generation only.
►Adhere to the installation, commissioning, operating, and maintenance instructions.
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►Use only accessory parts recommended by Pfeiffer Vacuum.
►Use the vacuum pump to convey potentially explosive atmospheres in accordance with the label-
ing.
►Operate the vacuum pump within the application limits of the product (see chapter “Product usage
limits”, page 18) and in compliance with the technical data.
►Observe the corresponding safety measures (see chapter “Safety measures”, page 17).
2.7 Foreseeable improper use
Improper use of the product invalidates all warranty and liability claims. Any use that is counter to the
purpose of the product, whether intentional or unintentional, is regarded as improper use; in particular:
●pumping media which are corrosive to or too aggressive for the vacuum pump materials
●pumping media that introduce an ignition source to the suction chamber
●pumping pyrophoric or corrosive media, or media releasing FKM
●pumping media prone to spontaneous, specific exothermic reactions
●pumping media that contain impurities such as particles, dust, or condensate
●pumping media that can condense or cause adhering deposits to form in the suction chamber
●pumping media with a propensity to sublimation
●pumping pressurized media (> atmospheric pressure)
●pumping fluids
●pumping radioactive media
●using the vacuum pump outside the specified area of application
●using the vacuum pump in systems in which sporadic loads and vibrations or periodic forces act
on the unit
●using the vacuum pump in strong electrical, magnetic, or electromagnetic fields
●using for media being pumped for which the ignition temperature drops below a temperature limit
of T4, at pressures greater than atmospheric pressure
●using pipes to lift the vacuum pump
●using accessories or spare parts not listed in this manual
●using the vacuum pump as a climbing aid
●painting the vacuum pump, motor and accessories
●using operating fluids that have not been approved by Pfeiffer Vacuum
●using mineral-based operating fluids such as P3, with an oxygen concentration > 21 %.
Mineral-based operating fluids are combustible and ignite at high temperatures, and when they
come into contact with pure oxygen. These operating fluids oxidize heavily and thus lose their lu-
bricating capacity.
2.8 Personnel qualification
The work described in this document may only be carried out by persons who have appropriate profes-
sional qualifications and the necessary experience or who have completed the necessary training as
provided by Pfeiffer Vacuum.
Training people
1. Train the technical personnel on the product.
2. Only let personnel to be trained work with and on the product when under the supervision of
trained personnel.
3. Only allow trained technical personnel to work with the product.
4. Before starting work, make sure that the commissioned personnel have read and understood
these operating instructions and all applicable documents, in particular the safety, maintenance
and repair information.
2.8.1 Ensuring personnel qualification
Specialist for mechanical work
Only a trained specialist may carry out mechanical work. Within the meaning of this document, special-
ists are people responsible for construction, mechanical installation, troubleshooting and maintenance
of the product, and who have the following qualifications:
●Qualification in the mechanical field in accordance with nationally applicable regulations
●Knowledge of this documentation
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Specialist for electrotechnical work
Only a trained electrician may carry out electrical engineering work. Within the meaning of this docu-
ment, electricians are people responsible for electrical installation, commissioning, troubleshooting, and
maintenance of the product, and who have the following qualifications:
●Qualification in the electrical engineering field in accordance with nationally applicable regulations
●Knowledge of this documentation
In addition, these individuals must be familiar with applicable safety regulations and laws, as well as the
other standards, guidelines, and laws referred to in this documentation. The above individuals must
have an explicitly granted operational authorization to commission, program, configure, mark, and earth
devices, systems, and circuits in accordance with safety technology standards.
Trained individuals
Only adequately trained individuals may carry out all works in other transport, storage, operation and
disposal fields. Such training must ensure that individuals are capable of carrying out the required activi-
ties and work steps safely and properly.
2.8.2 Personnel qualification for maintenance and repair
Advanced training courses
Pfeiffer Vacuum offers advanced training courses to maintenance levels 2 and 3.
Adequately trained individuals are:
●Maintenance level 1
─Customer (trained specialist)
●Maintenance level 2
─Customer with technical education
─Pfeiffer Vacuum service technician
●Maintenance level 3
─Customer with Pfeiffer Vacuum service training
─Pfeiffer Vacuum service technician
2.8.3 Advanced training with Pfeiffer Vacuum
For optimal and trouble-free use of this product, Pfeiffer Vacuum offers a comprehensive range of
courses and technical trainings.
For more information, please contact Pfeiffer Vacuum technical training.
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