Pfeiffer Vacuum OKTA 4000 ATEX User manual

OPERATING INSTRUCTIONS
EN
Translation of the Original
OKTA 4000 ATEX
Roots pump

Dear Customer,
Thank you for choosing a Pfeiffer Vacuum product. Your new roots pump should support you
in your individual application with full performance and without malfunctions. The name
Pfeiffer Vacuum stands for high-quality vacuum technology, a comprehensive and complete
range of top-quality products and first-class service. From this extensive, practical experience
we have gained a large volume of information that can contribute to efficient deployment and
to your personal safety.
In the knowledge that our product must avoid consuming work output, we trust that our
product can offer you a solution that supports you in the effective and trouble-free
implementation 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.
2/62

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
1.4 Trademark proof 10
2 Safety 11
2.1 General safety information 11
2.2 Safety instructions 11
2.3 Safety precautions 15
2.4 ATEX classification and safety measures 15
2.4.1 Labeling of the vacuum pump 16
2.4.2 Potential hazards 17
2.4.3 Safety measures 17
2.5 Limits of use of the product 18
2.6 Proper use 19
2.7 Foreseeable improper use 19
3 Product description 21
3.1 Functional description 21
3.1.1 Design with overflow valve 21
3.1.2 Design with blocked overflow valve 22
3.2 Identifying product 22
3.3 Scope of delivery 23
4 Transportation and Storage 24
4.1 Transporting the vacuum pump 24
4.2 Storing vacuum pump 25
5 Installation 26
5.1 Preparatory work 26
5.2 Setting up vacuum pump 26
5.3 Filling with lubricant 27
5.4 Connecting vacuum side 28
5.5 Connecting the fore-vacuum side 29
5.6 Setting and checking the temperature monitoring 30
5.6.1 Check thermometer installation dimension 30
5.6.2 Arrange a signal evaluation for the thermometer 31
5.7 Connect to mains power supply 31
5.7.1 Connecting three phase motor with 6-pin terminal board 32
5.7.2 Checking the direction of rotation 33
5.7.3 Connecting the PTC thermistor tripping unit 33
5.8 Observing the motor torque 34
6 Operation 35
6.1 Putting the vacuum pump into operation 35
6.2 Operation with frequency converter 35
6.2.1 Observe the voltage slew rate 35
6.2.2 Observe the mechanical resonance 35
6.3 Switching on vacuum pump 36
6.4 Adjusting the sealing gas amount 36
Table of contents
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6.5 Checking the power input 37
6.6 Vibration monitoring 38
6.6.1 Monitor the operating condition 39
6.6.2 Monitoring the bearing condition 39
6.6.3 Monitoring the motor condition 40
6.7 Switching off and venting the vacuum pump 40
7 Maintenance 42
7.1 Maintenance information 42
7.2 Checklist for inspection and maintenance 43
7.3 Changing lubricant 45
7.4 Cleaning the suction chamber 47
7.5 Cleaning the overflow valve 47
8 Decommissioning 49
8.1 Shutting down for longer periods 49
8.2 Recommissioning 49
9 Recycling and disposal 50
9.1 General disposal information 50
9.2 Dispose of Okta roots pumps 50
10 Malfunctions 51
11 Service solutions by Pfeiffer Vacuum 53
12 Spare parts 55
12.1 Ordering spare parts packs 55
13 Accessories 56
13.1 Accessory information 56
13.2 Ordering accessories 56
14 Technical data and dimensions 57
14.1 General 57
14.2 Technical data 57
14.3 Dimensions 58
Declaration of Conformity 60
Declaration of Conformity 61
Table of contents
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List of tables
Tbl. 1: Variants 7
Tbl. 2: Stickers on the product 9
Tbl. 3: Abbreviations used 10
Tbl. 4: ATEX designations 17
Tbl. 5: Potential hazards 17
Tbl. 6: Measures and safety equipment 18
Tbl. 7: Permissible ambient conditions 19
Tbl. 8: Maximum permissible forces and torques on the intake flange 29
Tbl. 9: Thermometer type 30
Tbl. 10: EPL (Equipment protection level) 31
Tbl. 11: Evaluated frequency ranges 39
Tbl. 12: Characteristic bearing damage frequencies of the roots pump 40
Tbl. 13: Characteristic frequencies of the roots pump 40
Tbl. 14: Relevant frequency range of the motor 40
Tbl. 15: Maintenance intervals 44
Tbl. 16: Overflow valve maintenance intervals 44
Tbl. 17: Troubleshooting 52
Tbl. 18: Accessories 56
Tbl. 19: Consumables 56
Tbl. 20: Conversion table: Pressure units 57
Tbl. 21: Conversion table: Units for gas throughput 57
Tbl. 22: Technical data Okta 4000 ATEX with lubricant P3 and H1 58
List of tables
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List of figures
Fig. 1: Position of the stickers on the product 9
Fig. 2: Okta 4000 ATEX design 21
Fig. 3: Okta ATEX | Overflow valve active 22
Fig. 4: Okta ATEX | overflow valve blocked 22
Fig. 5: Transporting the vacuum pump using a belt 25
Fig. 6: Dismantle the fittings to vent the vacuum pump 26
Fig. 7: Filling with lubricant 28
Fig. 8: Loading capacity of the connection flange 29
Fig. 9: Check temperature monitoring 30
Fig. 10: Delta connection for low voltage 32
Fig. 11: Star circuit for high voltage 33
Fig. 12: Checking the direction of rotation 33
Fig. 13: Connection example with PTC thermistor tripping unit 34
Fig. 14: Position of the vibration sensors 38
Fig. 15: Draining lubricant 46
Fig. 16: Filling with lubricant 46
Fig. 17: Overflow valve 48
Fig. 18: Okta 4000 ATEX 59
List of figures
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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
Document Number
Declaration of conformity for “Equipment category 2G” Part of this document
Declaration of conformity for “Equipment category 3G” Part of this document
Technical information for the thermometer Supplier document
Operating instructions for the motor Supplier document
Operating instructions for the coupling Supplier document
You can find these documents in the Pfeiffer Vacuum Download Center.
1.1.2 Variants
These instructions apply for different roots pump designs:
Permissible temperature range Lubricant type
+5°C ≤ Ta ≤ +40°C P3
-20°C ≤ Ta ≤ +40°C H1
Tbl. 1: Variants
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.
About this manual
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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. ...
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 meanings.
Mod.: Okta 4000 ATEX
Weight: 700 kg
3
D-35641 Asslar
Made in Germany
Mod.-No.: PP W73 ...
n: max. 3600 1/min Oil: P3 7,0 l
S(N): max. 5190 m /h
06/2019
II 3/3G Ex h IIB T3 Gc X
Ser. -No.: 1234567895
+ 5°C T + 40°C
a
=
<=
<
Rating plate (example)
The rating plate is located on the front side above the
sight glass
Motor rating plate (not shown)
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 roots pump with lubricant before commissioning
Achtung!
nur mit H1 befüllen
Attention!
only H1 to be used
Sticker – only in case of H1 lubricant:
● Caution: fill with H1 only
ATEX - Überströmventil
ATEX Overflow valve
D-35641 Asslar
Sticker - Overflow valve
Note: Pump design with overflow valve.
About this manual
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Warning hot surface
This sticker warns of injuries caused by high tempera-
tures as a result of contact without protection during op-
eration.
Magnetic field warning
This sticker warns of injuries to people with pacemak-
ers.
Tbl. 2: Stickers on the product
2
1
3
4
567
Fig. 1: Position of the stickers on the product
1 Rating plate 5 Note: Filling with lubricant
2 Note: ATEX overflow valve 6 Notice: Only fill with H1 (optional)
3 Magnetic field warning sign 7 Hot surface warning sign
4 Direction of rotation arrow (cast in pump housing)
1.3.4 Abbreviations
Abbreviation Explanation
ASSealing gas content at the operating gas flow
OI Operating instructions
DIN German Institute for Standardization (Deutsches Institut für Normung)
EPL Equipment Protection Level
ISO International Organization for Standardization
nRotation speed [Hz]
pIntake pressure [hPa]
PE Protective earth (earthed conductor)
p0Ambient pressure [hPa]
pVFore-vacuum pressure [hPa]
PN Nominal pressure stage (pressure nominal)
PWM Pulse width modulation
∆p Differential pressure max. [hPa]
QSSealing gas flow
SI Service instructions
SIL Safety Integrity Level in accordance with safety standard DIN EN 61508
SR Voltage slew rate
Sth Nominal pumping speed roots pump, theoretical
SVPumping speed backing pump
About this manual
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Abbreviation Explanation
WAF Width Across Flats
Ta Permissible ambient temperature
Tbl. 3: Abbreviations used
1.4 Trademark proof
●Loctite® is a trademark of HENKEL IP & HOLDING GMBH.
About this manual
10/62

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 causes an electric shock. Improper connection of
the mains supply leads to the risk of touchable live housing parts. 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
Danger of injury due to bearing damage
If the valid temperature range of the permissible lubricants is exceeded, insufficient lubrication can
lead to bearing damage. There is a risk of explosion due to causing an ignition hazard, and a risk of
serious injuries.
►Exclusively utilize the permissible lubricants for the intended temperature range.
►When filling, refilling, or changing the lubricant, always utilize the lubricant type specified on the
rating plate.
WARNING
Risk of fatal injury due to electric shock on account of incorrect installation
The device's power supply uses life-threatening voltages. Unsafe or improper installation can lead to
life-threatening situations from electric shocks obtained from working with or on the unit.
►Ensure safe integration into an emergency off safety circuit.
►Do not carry out your own conversions or modifications on the unit.
WARNING
Risk of crushing from rotating parts
Fingers and hands may be caught by rotating pistons within the connection flange. This results in se-
vere injuries.
►Keep limbs out of the reach of the roots pump.
WARNING
Risk of explosion when the ignition temperature of the pumped medium is reached
If the prescribed temperature monitoring is not in place, when the ignition temperature is reached in
the suction chamber this results in ignition.
►Always monitor the gas temperature in the fore-vacuum flange in order to safely comply with
temperature class T3.
►When a gas temperature of 180 °C is reached, switch the roots pump off (zero potential).
Safety
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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 injury from moving parts
After a power failure or a standstill as a result of overheating, the motor restarts automatically. There
is a risk of injury to fingers and hands if they enter the operating range of rotating parts.
►Safely disconnect motor from the mains.
►Secure the motor against reactivation.
►Dismantle the vacuum pump for inspection, away from the system if necessary.
Risks during operation
DANGER
Risk of injury due to the bearing bursting after overheating
During longer operation with defective bearings, there is a risk of explosion due to hot surfaces if
there is a potentially explosive atmosphere.
►Monitor the motor current of the roots pump so that in the event of a process-independent in-
crease of the motor current > 10 %, the roots pump is switched off.
►As an alternative, perform a vibration measurement at the defined measuring points with the pre-
scribed time intervals.
WARNING
Risk of crushing on rotating parts when reaching into the open flange
The pistons continue to run in the vacuum after switching off the motor, and can trap fingers and
hands within their reach.
►Wait until the vacuum pump comes to a complete standstill.
►Secure the vacuum pump against re-start.
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 other hazardous gas/air mixtures
Uncontrolled gas inlet of air or gases containing oxygen provides ideal conditions for the formation of
unexpected explosive gas/air mixtures in the vacuum system. This results in severe injuries.
►Use only inert gases for supplying the sealing gas supply in order to avoid a potential ignition.
Safety
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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 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.
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 to life from electric shock in the event of a fault
In the event of a fault, devices connected to the mains may be live. There is a danger to life from
electric shock when making contact with live components.
►Always keep the mains connection freely accessible so you can disconnect it at any time.
WARNING
Danger of injury due to bearing damage
If the valid temperature range of the permissible lubricants is exceeded, insufficient lubrication can
lead to bearing damage. There is a risk of explosion due to causing an ignition hazard, and a risk of
serious injuries.
►Exclusively utilize the permissible lubricants for the intended temperature range.
►When filling, refilling, or changing the lubricant, always utilize the lubricant type specified on the
rating plate.
WARNING
Risk of crushing from rotating parts
Fingers and hands may be caught by rotating pistons within the connection flange. This results in se-
vere injuries.
►Keep limbs out of the reach of the roots pump.
Safety
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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 environmental damage from toxic contaminated lubricant
Toxic process media can cause lubricant contamination. When changing the lubricant, there is a
health hazard due to contact with poisonous substances. Illegal disposal of toxic substances causes
environmental damage.
►Wear suitable personal protective equipment when handling these media.
►Dispose of the lubricant according to locally applicable regulations.
CAUTION
Scalding from hot lubricant
Danger of scalding when draining lubricant if it comes into contact with the skin.
►Wear protective equipment.
►Use a suitable collection receptacle.
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
►Do not expose body parts to the vacuum.
►Observe the safety and accident prevention regulations, if necessary wear personal protective
equipment.
►Check all safety measures at regular intervals.
►Always ensure a secure connection to the earthed conductor (PE), protection class I.
►During operation, make sure that plug-and-socket connections are securely fitted.
►Never operate the vacuum pump with open vacuum flange.
►Never make your own conversions or modifications to the vacuum pump.
►Before returning the vacuum pump, observe the notes in the chapter Service.
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
Safety
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potentially explosive areas. The vacuum pumps are delivered with an ATEX-certified motor and are
designated as follows:
Standard temperature range
●Ԑx II 2/2G Ex h IIB T3 Gb X +5 °C ≤ Ta ≤ +40 °C
Extended temperature range (with lubricant H1)
●Ԑx II 2/2G Ex h IIB T3 Gb X -20 °C ≤ Ta ≤ +40 °C
2.4.1 Labeling of the vacuum pump
Classification 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 excep-
tion of underground operations in mines and their surface installations which are
susceptible to hazardous firedamp and / or combustible dust.
Device category Device group II is divided into three categories which vary in their respective de-
gree of safety.
Devices of Device category 1 are designed to guarantee an extremely high de-
gree of safety. They must guarantee the necessary degree of safety even if mal-
functions occur only rarely on the device.
Devices of Device category 2 are designed to guarantee a high degree of safe-
ty. They must guarantee the necessary degree of safety even with regular occur-
rences 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.
Combustible ma-
terials 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 explo-
sion due to gases or vapors. Operation in dust-charged, potentially explo-
sive atmospheres is not permitted.
Type of protec-
tion 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 particu-
lar ignition capability (IIA, IIB and IIC). The ignition power in this regard decreas-
es from Explosion group IIA to IIC. (The higher Explosion group, e.g. IIC incorpo-
rates the respectively lower IIB and IIA).
Temperature
class Classification of equipment depending on their maximum surface temperature, in accordance 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 units
includes a safety margin to the minimum ignition temperature of a potentially ex-
plosive atmosphere, as stipulated in DIN EN ISO 80079-36.
EPL according to
DIN EN 60079 Equipment protection level
EPL Ga: Equipment with “extremely high” protection level for use in potentially
explosive gas atmospheres in which no risk of ignition exists during normal oper-
ation, with foreseeable or infrequent faults/malfunctions.
EPL Gb: Equipment with “high” protection level for use in potentially explosive
gas atmospheres in which no risk of ignition exists during normal operation, with
foreseeable faults/malfunctions.
EPL Gc: Equipment with “extended” protection level for use in potentially explo-
sive gas atmospheres in which no risk of ignition exists during normal operation.
Safety
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Classification Description
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. 4: ATEX designations
2.4.2 Potential hazards
The ignition hazard assessment for the roots pumps in the ATEX series was performed in accordance
with the harmonized standard ISO 80079-36 (Non-electrical equipment for explosive atmospheres - Ba-
sic method and requirements). This assessment includes the identification of hazards described as fol-
lows which will not occur if the system is operated properly with the respective safety measures.
Potential
hazard
Occurrence due to Safety measures
Hot surfaces Heating up of compo-
nents due to compression
work and friction
When used as intended, all surface temperatures are be-
low the measuring gas temperature in the exhaust chan-
nel.
Induction of eddy cur-
rents when the magnetic
coupling slips through
● Note the information to avoid this in the operating in-
structions.
Hot gases Compression of the re-
quired gases ● Measure the gas temperature in the exhaust channel using the supplied thermometer and evaluate the
temperatures.
● Note the information in the operating instructions of
the thermometer.
Mechanical
sparks Contact of the pistons in the suction chamber The air gaps for the maximum gas temperature are de- signed taking into account a safety factor.
Electrical
sparks Electric motor The use of an explosion-proof electric motor is prescri- bed.
● Observe the marking on the motor rating plate.
Static elec-
tricity Vacuum pump not earth- ed ● Integrate the vacuum pump in the equipotential bonding at the installation location.
Chemical re-
action Between the process gas and lubricant or between
the process gas and
components that are part
of the housing
● Evaluate the process and avoid hazardous process
conditions.
Zone en-
trainment due to leaky vacuum pump The vacuum pump underwent a final inspection with heli- um leak test within the framework of a production control
(leakage rate < 1 × 10-6 Pa m3/s).
Tbl. 5: Potential hazards
2.4.3 Safety measures
►Observe and implement the following safety measures for safe operation of the roots pump in ac-
cordance with the respective device category:
Safety
17/62

Place Measures/safety equipment Category 2 Category 3
Speci-
fica-
tion
We
rec-
om-
mend
Speci-
fica-
tion
We
rec-
om-
mend
Magnetic
coupling First switch on the roots pump when the back- ing pump can accept the required amount of
gas
x x
You must observe the volume flow ratio of
≤ 10:1 between the roots pump and backing
pump
x x
Only use the motors specified by Pfeiffer Vac-
uum. x x
Limitation of the motor torque by:
● frequency converter that limits the permis-
sible torque
or
● soft starter and continuous monitoring of
the power consumption
x x
Piston
bearing Check the power input of the motor to protect against bearing damage on the roots pump
(see chapter “Checking the power in-
put”, page 37)
Or:
Regular vibration measurement at the defined
measuring points and required time intervals
x x
Coaxiality
of the cen-
tering of
the flange
to the mo-
tor shaft
Check the coaxiality of the centering of the
flange to the shaft in accordance with standard
EN 50347: 2001, the table values reduced to
50 % are valid
Or:
Regular vibration measurement at the defined
measuring points and required time intervals
x x
Gas outlet
tempera-
ture
Monitor the gas outlet temperature with the
supplied thermometer (see chapter “Setting
and checking the temperature monitor-
ing”, page 30).
x x
Tbl. 6: Measures and safety equipment
2.5 Limits of use of the product
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 according to the motor used. Observe the motor manu-
facturer's operating instructions
Ambient temperature,
dependent on the pump design
+5°C to +40°C (for P3)
-20°C to +40°C (for H1)
Relative humidity of air max. 85 % (depending on the motor version)
Orientation Horizontal
Pumped medium intake temperature,
max. process-specific
Permanent intake pressure in circulation
mode < 1300 hPa (abs.)
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Max. speed in circulation mode 3600 rpm
Permanent intake pressure in vacuum
mode depending on max. pressure differential
Max. gas temperature, pressure side 180 ℃
Tbl. 7: Permissible ambient conditions
2.6 Proper use
►Only use the vacuum pump to create a vacuum in connection with a suitable backing pump.
►To protect the lubricant, use sealing gas if high boiling or corrosive media (e.g. solvents) are
pumped.
►Adhere to the installation, commissioning, operating, and maintenance instructions.
►Use only accessory parts recommended by Pfeiffer Vacuum.
►Use the vacuum pump to convey potentially explosive atmospheres in accordance with the label-
ing.
►Observe the corresponding safety measures (see chapter “Safety measures”, page 17).
►Operate the vacuum pump within the application limits of the product (see chapter “Limits of use
of the product”, page 18) and in compliance with the technical data.
–When operating the vacuum pump with frequency converter, make sure that the vacuum
pump never exceeds the max. permissible rotation speed, even in the event that the frequen-
cy converter malfunctions. Increased bearing wear is therefore avoided.
–When operating the vacuum pump with a rotation speed of less than 1500 min-1, as can be
the case in “windmilling” operation for example, you must ensure continuous vibration moni-
toring (see chapter “Vibration monitoring”, page 38). Therefore any bearing damage that is
caused by deficient lubrication can be detected in advance.
If this cannot be ensured, you must circumnavigate the vacuum pump by means of a bypass,
until it can be operated with the minimum rotation speed.
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 that can corrode or not be withstood by the vacuum pump materials
Components contained in the suction chamber are cast iron, steel, and stainless steel. Seals are
FPM (alternative seals available on request)
●Pumping media that introduce an ignition source to the suction chamber
●Pumping media that form adhesive deposits inside the suction chamber and cause the pistons to
touch or jam
●Pumping pressurized media (> atmospheric pressure)
●Pumping fluids – the use of fluids is permitted for cleaning purposes
●Pumping radioactive media
●Pumping media prone to spontaneous, specific exothermic reactions
●Use of the vacuum pump for cyclic evacuation procedures at and above atmospheric pressure
(load lock)
●Use of 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
●Use of the vacuum pump without blocking the overflow valve for pumps with blocked version
●Use of the vacuum pump with open vacuum and/or fore-vacuum flange open to the atmosphere
●Use of pipes to lift the vacuum pump
●Use of accessories or spare parts not listed in these instructions
●Use of the vacuum pump as a climbing aid
●Overcoating the vacuum pump whereby the permissible layer thicknesses in accordance with
DIN EN ISO 80079-36 are exceeded
●Use of operating lubricant other than that specified by Pfeiffer Vacuum
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●Use of the vacuum pump outside the temperature range stated on the rating plate
●Use of mineral-based lubricant, such as P3 with an oxygen concentration > 21%
Mineral-based lubricants are combustible and ignite at high temperatures, and when they come
into contact with pure oxygen. These lubricants oxidize heavily and thus lose their lubricating ca-
pacity.
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