Pfeiffer Vacuum OKTA 500 ATEX User manual

OPERATING INSTRUCTIONS
EN
Translation of the Original
OKTA 500 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.
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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 8
1.3 Conventions 8
1.3.1 Instructions in the text 8
1.3.2 Pictographs 9
1.3.3 Stickers on the product 9
1.3.4 Abbreviations 10
1.4 Trademark proof 10
2 Safety 11
2.1 General safety instructions 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 Product usage limits 18
2.6 Proper use 18
2.7 Foreseeable improper use 19
3 Product description 20
3.1 Functional description 20
3.2 Product identification 20
3.3 Scope of delivery 20
4 Transportation and Storage 22
4.1 Transporting the vacuum pump 22
4.2 Storing the vacuum pump 23
5 Installation 24
5.1 Preparatory work 24
5.2 Installing the vacuum pump 24
5.3 Filling with lubricant 25
5.4 Connecting the vacuum side 26
5.5 Connecting the fore-vacuum side 27
5.6 Setting and checking the temperature monitoring 28
5.6.1 Check thermometer installation dimension 28
5.6.2 Arrange a signal evaluation for the thermometer 29
5.7 Establishing mains connection 29
5.7.1 Connect three phase motor with 6-pin terminal board 30
5.7.2 Checking the direction of rotation 31
5.7.3 Connecting the PTC thermistor tripping unit 31
5.8 Observing the motor torque 32
6 Operation 33
6.1 Putting the vacuum pump into operation 33
6.2 Operation with frequency converter 33
6.2.1 Observe the voltage slew rate 33
6.2.2 Observe the mechanical resonance 33
6.3 Switching on the vacuum pump 34
6.4 Adjusting the sealing gas amount 34
6.5 Checking the power input 35
6.6 Vibration monitoring 36
Table of contents
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6.6.1 Condition monitoring of the vacuum pump 37
6.6.2 Monitoring the bearing condition 37
6.6.3 Monitoring the motor condition 38
6.7 Switching off and venting the vacuum pump 38
7 Maintenance 40
7.1 Maintenance information 40
7.2 Checklist for inspection and maintenance 41
7.3 Changing the lubricant 42
7.4 Cleaning the suction chamber 44
7.5 Cleaning the overflow valve 44
8 Decommissioning 46
8.1 Shutting down for longer periods 46
8.2 Recommissioning 46
8.3 Disposing of the vacuum pump 47
9 Malfunctions 48
10 Service solutions from Pfeiffer Vacuum 50
11 Spare parts 52
11.1 Ordering spare parts packs 52
12 Accessories 53
12.1 Accessory information 53
12.2 Ordering accessories 53
13 Technical data and dimensions 54
13.1 General 54
13.2 Technical data 54
13.3 Dimensions 56
Declaration of conformity 57
Declaration of conformity 58
Table of contents
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List of tables
Tbl. 1: Variants 8
Tbl. 2: Stickers on the product 9
Tbl. 3: Abbreviations used 10
Tbl. 4: ATEX designations 16
Tbl. 5: Potential hazards 17
Tbl. 6: Measures and safety equipment 18
Tbl. 7: Permissible ambient conditions 18
Tbl. 8: Maximum permissible forces and torques on the intake flange 27
Tbl. 9: Thermometer type 28
Tbl. 10: EPL (Equipment protection level) 29
Tbl. 11: Evaluated frequency ranges 37
Tbl. 12: Characteristic bearing damage frequencies of the roots pump 38
Tbl. 13: Characteristic frequencies of the roots pump 38
Tbl. 14: Evaluated frequency range of the motor 38
Tbl. 15: Maintenance intervals 41
Tbl. 16: Overflow valve maintenance intervals 42
Tbl. 17: Troubleshooting 49
Tbl. 18: Accessories 53
Tbl. 19: Consumables 53
Tbl. 20: Conversion table: Pressure units 54
Tbl. 21: Conversion table: Units for gas throughput 54
Tbl. 22: Technical data for category 3G 55
Tbl. 23: Technical data for category 2G 56
List of tables
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List of figures
Fig. 1: Position of the labels on the product 10
Fig. 2: Okta 500 ATEX design 20
Fig. 3: Transporting the vacuum pump using a belt 23
Fig. 4: Dismantle the fittings to vent the vacuum pump 24
Fig. 5: Filling with lubricant 26
Fig. 6: Loading capacity of the connection flange 27
Fig. 7: Check temperature monitoring 28
Fig. 8: Delta connection for low voltage 30
Fig. 9: Star circuit for high voltage 31
Fig. 10: Checking the direction of rotation 31
Fig. 11: Connection example with PTC thermistor tripping unit 32
Fig. 12: Position of the vibration sensors 36
Fig. 13: Drain the lubricant 43
Fig. 14: Filling with lubricant 43
Fig. 15: Overflow valve 45
Fig. 16: Okta 500 ATEX 56
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
These operating instructions are for customers of Pfeiffer Vacuum. They describe the function of the
designated product and provide the most important information for safe usage of the product. The de-
scriptions comply with applicable directives. All information provided in these operating instructions refer
to the current development status of the product. The documentation remains valid as long as the cus-
tomer does not modify the product in any way.
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 two different roots pump designs:
About this manual
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Variant Description
Overflow valve active In the design with overflow valve, the weight-loaded valve plate
opens in the overflow valve when the maximum pressure differential
is exceeded, and it allows, depending on the gas accumulation, a
more or less large part of the in-coming gas to flow back from the
pressure side to the intake side. This protects the roots pump
against overloading and allows it to be switched on in the high pres-
sure range at the start of evacuation. During the pump down proc-
ess, if the pressure difference is undershot by the weight force of the
valve plate, the overflow valve closes again.
The roots pump can be switched on directly after the backing pump.
Overflow valve blocked In the design with a blocked overflow valve, a drive with a frequency
converter can provide overload protection. If this is not present, the
roots vacuum pump must only be switched on when it has reached a
pressure at which the required gas quantity can be assumed by the
backing pump.
The blocking may not be canceled under any circumstances. As an
alternative, the optionally available ATEX-conform overflow valve
can be used.
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.
Individual action step
A horizontal, solid triangle indicates the only step in an action.
►This is an individual action step.
About this manual
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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 meaning.
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 D1 befüllen
Attention!
only D1 to be used
Sticker (blue) – special lubricant only
Attention! Fill the roots pump with D1 only
ATEX - Überströmventil
ATEX Overflow valve
D-35641 Asslar
Sticker - Overflow valve
Note: Pump design with overflow valve.
Warning hot surface
This sticker warns of injuries caused by high tempera-
tures in case of touching without protection during oper-
ation.
Magnetic field warning
This adhesive label warns of injuries to people with
pacemakers.
Tbl. 2: Stickers on the product
About this manual
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2
1
3
4
567
Fig. 1: Position of the labels on the product
1 Rating plate 5 Note: Filling with lubricant
2 Note: ATEX overflow valve 6 Note: Fill with lubricant (special model)
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
BA Operating instructions
DIN German Institute for Standardization (Deutsches Institut für Normung)
EPL Equipment Protection Level
ISO International Organization for Standardization
nRotation speed [Hz]
PE Earthed conductor (protective earth)
PN Nominal pressure stage (pressure nominal)
SI Service instructions
WAF width across flats
SIL Safety Integrity Level in accordance with safety standard DIN EN 61508
Tbl. 3: Abbreviations used
1.4 Trademark proof
●Loctite® is a trademark of HENKEL IP & HOLDING GMBH.
About this manual
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2 Safety
2.1 General safety instructions
This document includes the following 4 risk levels and 1 information level.
DANGER
Imminent danger
Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
►Instructions on avoiding the hazardous situation
WARNING
Possibly imminent danger
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
►Instructions on avoiding the hazardous situation
CAUTION
Possibly imminent danger
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
►Instructions on avoiding the hazardous situation
NOTICE
Danger of property damage
Notice is used to address practices not related to physical injury.
►Instructions on avoiding property damage
Notes, tips or examples indicate important information on the product or on this document.
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 sustaining injury from packaging material (foil) and plastic containers during trans-
port in potentially explosive atmospheres.
►The packaging should never be removed from the vacuum pump in potentially explosive atmos-
pheres.
DANGER
Risk of explosion when carrying out installation and maintenance work in potentially explo-
sive atmospheres
There is a risk of explosion if unsuitable tools are used in potentially explosive atmospheres.
►Transport, installation and maintenance work may not be performed in potentially explosive at-
mospheres.
►Always shut down the system before commencing any work on the system.
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
Contact with exposed and live elements generate 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, do a PE conductor check.
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.
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
The missing of the prescribed temperature monitoring leads to an ignition in the suction chamber,
once the ignition temperature is reached.
►Always monitor the gas temperature in the fore-vacuum flange in order to safely observe temper-
ature 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 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, explosive or other hazardous gas/air mixtures
Uncontrolled gas inlet of air or gases containing oxygen promotes 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.
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.
Safety
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Risks during maintenance, decommissioning and malfunctions
DANGER
Risk of explosion when carrying out installation and maintenance work in potentially explo-
sive atmospheres
There is a risk of explosion if unsuitable tools are used in potentially explosive atmospheres.
►Transport, installation and maintenance work may not be performed in potentially explosive at-
mospheres.
►Always shut down the system before commencing any work on the system.
DANGER
Risk of explosion from electrostatic charging during transport
There is a risk of sustaining injury from packaging material (foil) and plastic containers during trans-
port in potentially explosive atmospheres.
►The packaging should never be removed from the vacuum pump in potentially explosive atmos-
pheres.
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
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
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.
Safety
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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
1. Do not expose body parts to the vacuum.
2. Observe the safety and accident prevention regulations, if necessary wear personal protective
equipment.
3. Check all safety measures at regular intervals.
4. Always ensure a secure connection to the earthed conductor (PE), protection class I.
5. During operation, make sure that plug-and-socket connections are securely fitted.
6. Never operate the vacuum pump with open vacuum flange.
7. Never make your own conversions or modifications to the vacuum pump.
8. 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
potentially explosive areas. The vacuum pumps are delivered with an ATEX-certified motor and are
designated as follows:
●Ԑx II 3/3G Ex h IIB T3 Gc X +5 °C ≤ Ta ≤ +40 °C
●Ԑx II 2/2G Ex h IIB T3 Gb X +5 °C ≤ Ta ≤ +40 °C
Safety
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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.
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. 4: ATEX designations
Safety
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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:
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
Safety
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Place Measures/safety equipment Category 2 Category 3
Speci-
fica-
tion
We
rec-
om-
mend
Speci-
fica-
tion
We
rec-
om-
mend
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 35)
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 28).
x x
Tbl. 6: Measures and safety equipment
2.5 Product usage limits
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 wa-
ter, strong drafts and sunlight
─ fire-fighting water
─ lightning strike
Installation altitude according to the motor used. Observe the operating instruc-
tions of the motor manufacturer!
Ambient temperature +5 °C to +40 °C
Relative air humidity max. 85 % (depending on the motor version)
Orientation Horizontal
Pumped medium intake temperature,
max. process-specific
Permanent intake pressure in circu-
lation mode < 1300 hPa (abs.)
Max. speed in circulation mode 3600 rpm
Permanent intake pressure in vac-
uum mode depending on max. pressure differential
Max. gas temperature, pressure side 180 °C
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.
Safety
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►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 “Product usage
limits”, 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 36). 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 misuse, 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 above atmospheric pressure (load
lock)
●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 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
●Using lubricants not specified by Pfeiffer Vacuum
●Using pipes to lift the vacuum pump
●Use of accessories or spare parts that are not listed in these instructions
●Using 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 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.
Safety
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3 Product description
3.1 Functional description
The operating principle of the roots pump is based on 2 synchronous pistons that rotate in a housing
without touching. The pumping effects arise as a result of the opposing rotation of the 2 figure-of-eight
shaped rolling pistons. While suction chambers are formed between the rolling pistons and the housing,
the rolling pistons continuously form a mutual seal without touching each other or the housing. A pair of
gears positioned on the extended shaft ends, causes the opposing, synchronous running of the roots
pistons. Lubrication is limited to the two bearing and gear chambers which are arranged separately from
the suction chambers. Operation with a backing pump connected upstream enables compressing
against atmospheric pressure.
Roots pumps from the ATEX series are equipped with a magnetic coupling and a thermometer.
1 2 3 4
5
67910
11
12
8
Fig. 2: Okta 500 ATEX design
1 Blank flange (mounted on the vacuum flange) 7 Thermometer
2 Eye bolts 8 Fore-vacuum flange
3 Valve for inert gas filling (mounted on the measurement connection) 9 Drain screw
4 Motor (ATEX design) 10 Sight glass
5 Magnetic coupling (hidden by the lantern) 11 Filler screw
6 Sealing gas connections (4×) 12 Overflow valve
3.2 Product identification
To ensure for a clear identification of the product when communicating with Pfeiffer Vacuum, always
keep all of the information on the rating plate to hand.
The following information is shown on the rating plate:
●Pump model
●Model number
●Type and quantity of the lubricant
●Max. allowable pump rotation speed
●Date of manufacture
●Input voltage range
3.3 Scope of delivery
●Roots pump with motor / motor provided by the customer
●Connection flanges produced in accordance with PN 16
●Seal for the connection flange
●Protective cover for the connection flange
Product description
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