Oerlikon RUVAC WA User manual

Part Numbers
112 17/54
113 22/42
117 20/21/24/30/31/34/40/41/44
/50/51
118 31/41/51
128 38
155 008/011V
167 004/022
RUVAC WA / WAU
251/501/1001/2001
Roots vacuum pumps
ATEX Categories 3 i and 3 i/o
Installation and Operating Instructions GA03107_002_A4

Contents
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Page
0 Important Safety Information 5
0.1 Mechanical Hazards 5
0.2 Electrical Hazards 6
0.3 Thermal Hazards 7
0.4 Hazards Caused by Materials and Substances 7
0.5 Ignition Risk 8
0.6 Noise Hazard 8
0.7 Danger of Pump Damage 9
RUVAC Roots Pumps WA/WAU ATEX 10
Classification and Marking of the Pump 10
Explanation of the Symbols 11
Determining the Operating Range 13
Fitting the Pt 100 Temperature Sensor 16
Additional Installation Requirements “X” 21
Potential Ignition Sources 22
1 Description 25
1.1 Design and Function 25
1.1.1 Principle of Operation 25
1.1.2 Design 27
1.1.3 Pressure Balance Line 28
1.1.4 Lubricants 29
1.2 Standard Specification 29
1.3 Technical Data 30
1.3.1 Motor Data 32
1.4 Ordering data 33
2 Transport and Storage 35
3 Installation 36
3.1 Installation 36
3.1.1 Filling in of the oil 37
3.2 Conforming Utilisation 38
3.2.1 Non-conforming Utilisation 39
3.3 Electrical Connection 40
3.4 Connecting the Flanges 43

Contents
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Original installation and operating instructions.
3.5 Connecting the ATEX-Motor 44
3.5.1 General Installation Information 45
3.5.2 Fitting the Coupling 46
3.5.3 Fitting the Motor 47
3.5.4 Electrical Connection 47
4 Operation 48
4.1 Start-up 48
4.2 Operation 49
4.3 Shutdown and Storage 50
4.4 Changing from Vertical to Horizontal Flow 50
5 Maintenance 53
5.1 Safety Information 53
5.2 Exchanging the Oil / Bearing Chambers 54
5.3 Oil change / Shaft Seal Housing 55
5.4 Cleaning the Fan Cowl and the Cooling Fins 56
5.5 Cleaning the Intake Screen 56
5.6 Cleaning the Pumping Chamber 56
5.7 Cleaning the Valve of the Pressure Balance Line 57
5.8 Exchanging the Shaft Seals 58
5.8.1 Preparations 59
5.8.2 RUVAC WA/WAU 251, 501 59
5.8.3 RUVAC WA/WAU 1001, 2001 61
5.9 Exchanging the Bearings 62
5.10 Service at Oerlikon Leybold Vacuum 62
5.11 Maintenance Schedule 63
6 Troubleshooting 64
7 Wearing and Original Spare Parts 66
8 Waste Disposal 66
EC Declaration of Conformity 68
EC Incorporation Declaration 69

Safety Information
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Obligation to Provide Information
Before installing and commissioning the pumps, carefully read these
Operating Instructions and follow the information so as to ensure optimum
and safe working right from the start.
The Oerlikon Leybold Vacuum RUVAC WA/WAU has been designed for safe
and efficient operation when used properly and in accordance with these
Operating Instructions. It is the responsibility of the user to carefully read and
strictly observe all safety precautions described in this Section and throug-
hout the Operating Instructions. The pump must only be operated in the
proper condition and under the conditions described in the Operating
Instructions. It must be operated and maintained by trained personnel only.
Consult local, state, and national agencies regarding specific requirements
and regulations. Address any further safety, operation and/or maintenance
questions to our nearest office.
DANGER indicates an imminently hazardous situation which, if not avoid-
ed, will result in death or serious injury.
WARNING indicates a potentially hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION indicates a potentially hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE is used to notify users of installation, operation, programming or
maintenance information that is important, but not hazard related.
Figures
The references to diagrams, e.g. (4.1/2) consist of Section No., consecutive
fig. No. within the Section and the Item No. in the figure in that order.
We reserve the right to modify the design and the specified data. The illustra-
tions are not binding.
Retain the Operating Instructions for further use.
NOTICE
DANGER
WARNING
CAUTION
NOTICE

Safety Information
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0 Important Safety Information
0.1 Mechanical Hazards
1 Avoid exposing any part of the human body to the vacuum.
2 Even during standstill of the RUVAC it is dangerous to grasp into the
pump casing. Fingers can easily be squeezed between impellers due
to the high inertia of the parts. Please use caution when grasping into
the pump and make sure that the pump is secured against unwanted
rotation due to differential pressures.
3 The crane eyes of the RUVAC pumps must not be used to lift any
pump combinations (Roots + backing pump). Exceptions are allowed
only with approval from OLV. Secure the pump by the crane at the
intended eyes until a firm connection has been established with the
backing pump or a corresponding suspension has been installed.
4 Do not operate the pump with any of the covers removed. Serious
injury may result.
5 Never operate the RUVAC without connected intake line or blank
flange at the intake.
6 Make sure that the gas flow from the discharge port is not blocked or
restricted in any way.
7 It is recommended to always only operate the RUVAC with a suitable
discharge line which is properly connected.
8 If discharged gases must be collected or contained, do not allow the
discharge line to become pressurized.
9 When moving the RUVAC always use the allowed means.
Two crane eyes are provided on this pump as standard.
10 Do not allow the ingestion of any objects (screws, nuts, washers, piec-
es of wire, etc.) through the intake port of the pump. The use of the
intake screen is strongly recommended. In case the pump is operated
without intake screen the operator has to make sure that no objects
can enter the pump through the intake port. Objects falling into the
pump can cause severe damage including leaks to atmosphere.
11 Should malfunctions affect the pump, seized impellers in particular
owing to hard deposits or foreign objects, the occurrence of leaks
affecting the housing cannot be ruled out. When pumping hazardous
gases the operator must ensure that the possibility of such an incident
is excluded, respectively that leaks at the pump casing will not pose a
hazard.
12 In order to prevent the destruction of equipment and injuries to the
operating personnel, we urgently recommend to follow the installation
instructions given in these Operating Instructions.
WARNING

Safety Information
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13 The pumps must only be operated at the permitted speeds. Especially
when using frequency converters which have not been specifically
approved by Oerlikon Leybold Vacuum, you need to ensure an effec-
tive protection against overspeeding.
0.2 Electrical Hazards
1 Potentially lethal voltages are present at the mains connections.
Before beginning with any maintenance or service work on the
RUVAC, disconnect the pump from all power supplies (lockout/tagout).
2 The electrical connections must only be provided by a trained electri-
cian as specified, for example, by the regulations EN 50110-1. Note
the national regulations of the country in which the equipment is in
being operated.
3 Before initial commissioning install a suitable motor protection switch
for the electric motor. Please note the information given in these
Operating Instructions and on the electric motor (terminal diagram).
4 Before commissioning, check the junction box to ensure that it is
undamaged, perform a visual inspection on the seals.
5 Install add-on parts (pressure switches, for example) without any ten-
sions and protect these against damage by impacts, for example.
6 Lay the connecting lines so that they cannot be damaged. Protect the
lines against humidity and contact with water. Avoid thermally stressing
the lines due to unfavourable laying. Observe the required standards
when designing and laying the electrical connections.
7 Provide strain relief for the connecting lines so that the plugs and the
line connectors are not exposed to excessively high mechanical stress-
es.
8 Lay the electric lines so that there is no risk of tripping over these.
9 The RUVAC must be integrated in the system control arrangement so
that the pump can not run-up automatically after it has been shut
down due to overtemperature of the motor. This applies equally to
emergency shut-down arrangements. After having determined the fault
cause, the pump should be switched on manually again.
10 The following applies to pumps being operated with a frequency con-
verter: after a mains power failure the pump will automatically start up
again once the power returns.
WARNING

Safety Information
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0.3 Thermal Hazards
1 Hot surfaces, risk of suffering burns.
Under certain ambient conditions the pump may attain temperatures
over 80° C. There then exists the risk of suffering burns. Note the dan-
ger symbols on the pump and in the case of a hot pump wear the
required protection equipment.
If there is the risk of touching hot surfaces inadvertently, install corre-
sponding protection. When working on a pump which is still warm
from operation, always wear protective gloves.
2 The pump must only be operated at ambient temperatures between
12 and 40 °C. It needs to be ensured that the thermal radiation pro-
duced by the pump can be dissipated sufficiently. If the pump has to
be operated at higher ambient temperatures than 40 °C for any rea-
son, reduced max. differential pressures apply (derating). Please con-
sult OLV for further details.
3 Before any servicing and maintenance work always let the pump cool
down first.
4 Note the warning information on the housing surface. If these warning
notices have been removed, are covered or obstructed, include corre-
sponding additional warning information
0.4 Hazards Caused by Materials and Substances
1 The vacuum line must be leaktight. Hazardous process gases may
escape or the pumped gases can react with air or atmospheric humid-
ity. After installation of the pump and after servicing work on the vacu-
um system, a leak test will always be necessary.
When pumping hazardous gases we recommend a leak test on a reg-
ular basis. Leaks in the pump cannot be ruled out under all circum-
stances. When pumping hazardous gases, the operator must ensure
that leaks at the pump will not be a hazard.
2 Since not all application related hazards for vacuum systems can be
described in detail in these Operating Instructions, Oerlikon Leybold
Vacuum has available a separate document (Safety Booklet) in which
the hazards and general safety concepts for design, operation and
maintenance of vacuum systems are explained.
When planning to pump hazardous substances with this pump, read
the related chapters in the Safety Booklet and in these Operating
Instructions first. You can download the Safety Booklet from our
homepage.
3 Contaminated parts can be detrimental to health and environment.
Before beginning with any work, first find out whether any parts are
contaminated. Adhere to the relevant regulations and take the neces-
sary precautions when handling contaminated parts.
CAUTION
DANGER

Safety Information
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4 The user has to ensure that all appropriate safety codes and all safety
procedures are applied in case of pumping toxic, chemically reactive,
corrosive gases and/or pyrophoric substances. Before using the
RUVAC pumps with toxic and/or aggressive gases, it is imperative that
you consult your local Oerlikon Leybold Vacuum office.
5 Oerlikon Leybold Vacuum is not in a position to perform servicing
(repairs) and waste disposal of radioactively contaminated pumps.
Both needs to be ensured from the side of the user.
6 When pumping hazardous gases you must assume the presence of
corresponding residues in the pump.
7 When changing the oil, remove any escaped oil as otherwise there
exists the risk of slipping.
8 After having completed the installation work we recommend running of
a leak test on the complete installation at an absolute pressure of 1100
mbar. Otherwise the possibility of escaping of process gases cannot
be completely ruled out.
0.5 Ignition Risk
1 Basically the RUVAC pumps must not be used with flammable or
explosive gases and vapors. In particular cases the composition of the
substances may not be critical. In any case the user is obliged to ana-
lyse the situation carefully and to take appropriate precautions intro-
duced by competent experts.
2 Before pumping oxygen (or other highly reactive gases) at concentra-
tions exceeding the concentration in the atmosphere (> 21 % for oxy-
gen) it will be necessary to use a special pump. Such a pump will have
to be modified and degreased, and an inert special lubricant (like
PFPE) must be used.
3 Before commissioning the RUVAC, make sure that the media which
are to be pumped are compatible with each other so as to avoid haz-
ardous situations. All relevant safety standards and regulations must
be observed.
4 The standard version of the RUVAC is not suited for operation in
explosion hazard areas. Contact us before planning to use the pump
under such circumstances. Check based on the nameplates for which
zone the pump is suited. Motor and accessories when installed within
an explosion hazard zone must also be approved for this zone.
0.6 Noise Hazard
1 The noise level produced by the RUVAC is between 64 and 80 dB(A).
When operating the pump temporarily at pressures above 100 mbar
the noise level can be much higher. Make sure that suitable protection
measures are taken to protect your hearing.
2 When the pump is being started with open flanges, a noise level which
is detrimental to health will be produced. If such operation is unavoid-
able, then it is mandatory to wear hearing protectors (ear muffs).
CAUTION
CAUTION

Safety Information
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0.7 Danger of Pump Damage
1 Do not use the pump for applications that produce abrasive or adhe-
sive powders or condensable vapors that can leave adhesive or high
viscosity deposits. Please contact Oerlikon Leybold Vacuum Sales for
selecting the right separator.
2 Vapors which condense upon being compressed within the pump to
liquids must be avoided when their vapor pressure exceeds the vapor
tolerance of the pump.
3 Before pumping vapors, the RUVAC should have attained its operating
temperature. The pump will have attained its operating temperature
about 1 hour after starting the pump. During this time the pump
should be separated from the process by a valve in the intake line, for
example.
4 In order to prevent the transfer of vibrations from the RUVAC to other
parts of the system we recommend the use of corrugated hoses or
compensators on both the intake and the discharge sides.
5 Do not use the RUVAC pumps in combination with backing pumps
that have an ultimate pressure above 10 mbar. This prevents exces-
sively high temperatures of the RUVAC in idle mode operation.
6 In the case of wet processes we recommend the installation of liquid
separators upstream and downstream of the pump so as to avoid a
massive influx of liquid into the pump.
7 The discharge line should be laid so that it slopes down and away
from the pump so as to prevent condensate from backstreaming into
the pump.
8 The ingress of particles and liquids must be avoided under all circum-
stances.
9 Before installing, all flange covers must be removed.
10 The location where the RUVAC is installed must be selected such that
all controls are easily accessible.
11 In order to ensure an adequate supply of oil, the location at which the
RUVAC (including its accessories) is operated should be such that
angles over > 1° from the vertical are avoided.
NOTICE

ATEX
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RUVAC Roots Pumps WA/WAU ATEX
Category 3 (inside)
Category 3 (inside) and (outside)
Important information for operating the RUVAC WA/WAU
251/501/1001/2001 ATEX Category 3 Roots pumps in potentially
explosive atmospheres
The Roots pumps RUVAC WA/WAU 251/501/1001/2001 ATEX Category 3
(inside) respectively 3 (inside) and 3 (outside) have been designed and manu-
factured especially for the purpose of complying with the requirements of
Equipment Group II, Category 3 of the “ATEX Directive (Directive 94/9/EG) for
conforming utilisation of equipment and protection facilities in explosion haz-
ard areas”.
Classification and Marking of the Pump
The pumps RUVAC WA 251 to 2001 ATEX Category 3 (inside) and (outside)
fulfil both for the inside (process gas side) as well as also for the outside of
the pump the basic safety requirements laid down in the guideline.
These pumps are marked as follows:
(inside) 3G IIC TX1) (50 Hz)* (12 °C <Ta< 40 °C) X
II
respectively
(inside) 3G IIC TX1) (50 Hz)*
II (outside) 3G IIC T3/T4 - (12 °C <Ta< 40 °C) X
* The ATEX certification is valid only for operation at 50 Hz. The temperature class “outside” may
be subject to further restrictions due to the motor used.
1) TX refers to the temperature classes and depends on the specific usage conditions.
Explanations on this are given in the following text.

ATEX
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Explanation of the Symbols
II
Equipment Group II applies to all equipment for use in areas which can be
endangered by an explosive atmosphere except in underground mining oper-
ations and their related above ground systems which can be endangered by
mine gas and/or combustible dust.
Inside/outside
Specifies the category/conditions according to which the inside (i) (i.e. sec-
tions of the equipment in contact with the process gas flow) and the outside
(o) of the equipment are classified provided these differ.
3
Category 3 comprises equipment which is designed such that it can be oper-
ated in agreement with the characteristic quantities (operating parameters)
specified by the manufacturer and which ensure a normal level of protection.
Equipment belonging to this category is intended for use in areas where it
needs not to be expected that an explosive atmosphere occurs due to
gases, vapors, mists or raised dust but, in case such an atmosphere should
occur in spite of this then according to all probability only rarely and briefly.
Equipment belonging to this category ensures during normal operation the
required degree of safety.
G
For areas with an explosive atmosphere caused by gases, vapors or mists in
the air.
The pump is not suited for areas with an explosive atmosphere caused by
explosive dusts.
II, IIA, IIB or IIC
Explosion Groups: these are subdivisions for equipment belonging to Group II
which is employed in connection with some protection types. This subdivision
is based on the concept of the maximum permitted gap and the minimum
ignition current of the explosive mixture. Refer to Annex A of the European
Standard EN 50014. (EN 50014 electrical apparatus for potentially explosive
atmospheres — General requirements).
Equipment marked with IIB is suited for applications which require equipment
with the marking IIA. Correspondingly equipment marked with IIC is suited for
applications which require equipment belonging to Explosion Group IIA or IIB.
Equipment which is suited for all types of application can be marked by II or
not marked at all.

ATEX
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TX (Temperature Class 1 - 6)
Temperature class: Classification of equipment in classes depending on their
maximum surface temperature corresponding to the following table:
Temperature class Maximum surface temperature (°C)
T1 450
T2 300
T3 200
T4 135
T5 100
T6 85
Example: Pumps belonging to temperature class T3 must only be utilised to
pump gases which exhibit an ignition temperature of over 200 °C.
By design the gas temperatures in the case of the RUVAC are higher than
the surface temperatures.
The temperature class and the actual maximum surface temperature of the
equipment includes a safety margin with respect to the minimum ignition
temperature of the potentially explosive atmosphere as demanded in EN
13463-1.
50 Hz
The nominal frequency for operation as an ATEX pump is 50 Hz.
Ta
The permissible ambient temperature for operating the pump is
12 °C < Ta < 40 °C.
X
Special operating conditions need to be maintained! The special conditions
and notes given in the Operating Instructions and given in this chapter apply.
Usage Conditions
The operating temperature limits much depend on the application conditions.

ATEX
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Ignition Protection Type and Marking of the Electrical Compo-
nents of the RUVAC WA/WAU ATEX Kat. 3 (i) and 3 (i) / 3 (o)
a) Motor:
Ex e IIC T3 (200 °C) bzw. Ex de IIC T4 (135 °C)
b) Temperature sensor (only permissible for T3 operation)
In order to ensure that in any operating mode and in case the forevacuum
pump is affected by malfunctions, so that the machine does not exceed tem-
perature class T3, the use of a temperature sensor is required (not included
in the delivery). This temperature sensor measures the gas temperature at the
discharge flange of the RUVAC.
Ignition protection type, for example 1/2 G Ex ib IIC T6.
Determining the Operating Range
for TX in ATEX Zone 2 (i) and (o) X (Category 3 (i) and (o))
The possible operating range for temperature classification TX is based on
the effective pumping speed of the backing pump which is used (ScrewLine,
for example) and connected to the discharge port of the RUVAC and the
effective pumping speed of the RUVAC.
From this effective pumping speed there results the effective compression
ratio Keff. This is limited by the envelope K0 as maximum compression, and at
high pressures by the maximum permissible pressure difference.
Effective pumping speed RUVAC
Effective pumping speed of the backing pump at the discharge port RUVAC
keff =
pv = (compression pressure = pressure at the discharge side RUVAC)
pa = Operating pressure RUVAC (intake side)
keff =
keff = Effective compression ratio

ATEX
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Operation Keeping below Limit Temperatures
Basic diagram:
Kompression Keff
Verdichtungsdruck pvam Druckstutzen (mbar)
p
const, T3
0,01 0,1 110 100 1000
p
const, T4
T4 - Einsatzgrenze
T3 - Einsatzgrenze
k
0: maximal mögliche Kompression einer Rootspumpe
p
max - Grenze
Diagram 1
ko: Maximum possible compression of a Roots pump
T4 - operating limit
T3 - operating limit
∆pmax - limit
Compression Keff
Compression pressure pV at the discharge port (mbar)
Below a certain compression pressure pv ≤ pconst, TX the RUVAC WA/WAU ful-
fils at all times the requirements of temperature classification TX. When it is
ensured that this respective pressure is not exceeded and provided the back-
ing pump system is capable of supplying the specified pumping speed at all
times, then no temperature monitoring for the Roots pump will be necessary.
The intake pressure pa then results from the ATEX-specific forevacuum pres-
sures pconst, TX given in Table 2 and the effective compression ratio keff. If keff is
not known, it is recommended to use kth.
Nominal pumping speed RUVAC
Nominal pumping speed backing pump
kth =
kth = Theoretical compression ratio

ATEX
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Equation (1)
(1) pa, max. permissible = pconst, TX / kth
pa, max. permissible = maximum permissible operating pressure RUVAC
(intake side) for complying with TX
pconst, TX = Table value for TX (see table), pressure at Roots pump discharge side
kth = Theoretical compression ratio
Table 2: Maximum forevacuum pressures pconst for complying with
TX
Generally the following T2 T3 T4
applies to the max.
pressure difference
RUVAC ∆ pmax pconst, T2 pconst, T3 pconst, T4
[mbar] [mbar] [mbar] [mbar]
WA/WAU 251 80 ∆pmax / (kth-1)* 57 13
WA/WAU 501 80 ∆pmax / (kth-1)* 34 11
WA/WAU 1001 80 ∆pmax / (kth-1)* 23 7
WA/WAU 2001 50 25 12 3
∆pmax = Maximum permissible pressure difference for continuous operation: pv – pa
* The RUVAC WAU fulfils in every operating range the T2 limit. The pressure balance line limits
the pressure difference.
pconst, TX = Table value for TX (see table), pressure at RUVAC discharge port
kth = Theoretical compression ratio
pV = Compression pressure = Pressure at the RUVAC discharge side
pa = Operating pressure RUVAC (intake side)
For the operating range with higher pressures pv from pconst, TX the following
applies: The higher the ratio pumping speed Roots pump/pumping speed
backing pump (= keff) is, the higher the gas temperatures at the discharge
side of the Roots pump will be.
ATEX operation of the RUVAC WA and WAU above pconst, TX is only permissi-
ble after having asked Oerlikon Leybold Vacuum for a design rating.
Within this respective pressure range pv > pconst, TX the installation of the
temperature sensor which has been described is mandatory.
In the following cases the installation of a temperature sensor is mandatory
independently of the operating range:
■ The gas inlet temperature at the RUVAC exceeds 40 °C.
■ Thermally critical gases at high concentrations are being pumped
(at times) like, for example, argon, helium or other noble gases.
CAUTION

ATEX
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Equation (2):
(2) pa, max. permissible ≤ pv / keff, permissible ≤ ∆pmax / (kth-1)
If keff cannot be reliably determined, here too kth must be applied.
Generally the following applies to ATEX applications:
pE (cut-in pressure, see Section 4) = pa, max. permissible
Fitting the Pt 100 Temperature Sensor
∆p RUVAC WA
ps /pa
pv
pa = pv /kth
SV Roots
SV backing pump
Pt 100
Fig. 0.1 Temperature measurement with the temperature sensor Pt 100 for T3 operation
with kth =
The tip of the Pt 100 temperature sensor (P/N 155 010 - not included in the
delivery) measures the gas temperature in the middle of the RUVAC’s dis-
charge flange (see Fig. 0.1 and 0.2. Depending on the size of the RUVAC
pump respectively its flange, the Pt 100 sensor needs to be fitted at different
positions. The temperature sensor Pt 100 is equipped with three installation
marks (marks A,B,C, see Fig. 0.2). According to the information given in the
following table the Pt 100 must be inserted up to the respective mark into the
clamp fitting and secured reliably. In the enclosed installation instructions for
the clamp fitting, the required torque levels are stated. Before installing, the
transport protectors must be removed.
RUVAC WA/WAU
Pt 100
Fig. 0.2 Position of the temperature sensor at the discharge flange of the RUVAC WA/WAU
Motor
Protection tube with
installation marks (A/B/C)
Clamp fitting

ATEX
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Through the installation position and the measurement tolerances of the Pt
100, the shutdown temperatures listed in the table needed to be taken into
account. Proper operation of the monitoring facilities must be checked before
commissioning the equipment in accordance with prEN 13463-6, Section
10.2. The monitoring facility must fulfil the functional failure rate 1 (FFR1) of
prEN 13463-6. Here the requirements laid down in prEN 13463-6 must also
be taken into account.
Pt 100 signal processing
Exceeding the shutdown temperature of the sensor must reliably shut down
the Roots pump.
RUVAC WA/WAU 251 501 1001 2001
Installation position
Markings on the protection A A B C
tube (Fig. 0.2)
Shutdown temperature which
needs to be set up for T3 (200 °C) 100 °C 100 °C 100 °C 100 °C
Shutdown temperature which
needs to be set up for T4 (135 °C) Not permissible for T4 operation
Examples for Operation within Different Temperature Classes
T2
As can be seen from Table 2, the maximum pressure difference defines the limit
for the WA 251, WA 501 and WA 1001. For the WAU 251-2001, T2 is fulfilled at
all times. For operating the WA 2001 above the compression pressure pconst (25
mbar) and with required compliance with T2, please contact Oerlikon Leybold
Vacuum for rating information.
T3
WA/WAU 251 – 2001: For operation above the compression pressure pconst, T3
please contact Oerlikon Leybold Vacuum for rating information. When the
RUVAC WA is operated within this range, then the temperature sensor which
has been described must be installed.
T4
WA/WAU 251 – 2001: For operation above the compression pressure pconst, T4
please contact Oerlikon Leybold Vacuum for rating information.

ATEX
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Example for T3 without temperature monitoring
A RUVAC WA 501 ATEX Kat. 3 (i) / (o) is being operated together with a liquid
ring pump and a steam ejector pump. The liquid ring pump and the steam ejec-
tor pump generate a pumping speed of approximately150 m3 / h.
ATEX requirement: The WA 501 must not exceed the temperature T3 (200 °C).
The nominal pumping speed of the WA 501 is 505 m3 / h.
kth = Nominal pumping speed RUVAC / nominal pumping speed backing
pump = 505 m3 / h / 150 m3 / h = 3.36
According to equation (1): pa = pconst / kth
pconst (T3) = 34 mbar (see table)
Thus it follows that: pa = 34 mbar / 3.36 = 9.2 mbar
Result
Under these conditions the WA 501 may be switched on at an inlet pressure (=
process pressure) of 9.2 mbar and continuously operated. Here the require-
ments of temperature classification T3 are fulfilled at all times.
Example for T3 with temperature monitoring
Under these conditions the WA 501 may be switched on at an inlet pressure (=
process pressure) of 9.2 mbar and continuously operated. Here the require-
ments of temperature classification T3 are fulfilled at all times.
A RUVAC WA 501 ATEX Kat. 3 (i) / (o) is being operated together with a liquid
ring pump and a steam ejector pump. The liquid ring pump and the steam ejec-
tor pump generate a pumping speed of approximately150 m3 / h.
ATEX requirement: The WA 501 must not exceed the temperature T3 (200 °C).
However, the process pressure (pa) is limited from the side of the system to
20mbar.
For pa, max. permissible the following value was determined (see above):
pa = 34 mbar / 3.36 = 9.2 mbar
The maximum operating pressure for T3 is at 9.2 mbar thus below the given
process pressure of pa = 20 mbar. For this reason the operator must contact
Leybold before commissioning so as to clarify the possibility of T3 operation
under these conditions. Temperature monitoring with the PT100 (Kat-Nr. 155
010) will in any case be necessary above pa = 9.2 mbar.
In order to determine whether T3 compliance can be maintained at this process
pressure, please contact the Leybold Vacuum for a review and rating informa-
tion. For this, information on the pumping speed characteristic of your backing
vacuum pump system as well as the lengths and diameters of the connecting
lines is required.

ATEX
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Example for calculating pE and pa for a T2 application
A RUVAC WA 501 is being operated together with a backing pump at a pump-
ing speed of approximately 150 m3 / h. Compliance with temperature classifica-
tion T2 is required. This will be the case for the WA 501 in all operating modes
(see normal operation).
The nominal pumping speed of the WA 501 is 505 m3 / h.
kth = Nominal pumping speed RUVAC /Nominal pumping speed vacuum pump
= 505 m3 / h / 150 m3 / h = 3.36
According to equation (2): pS = pE ≤ ∆pmax / (kth – 1)
∆pmax (WA 501) = 80 mbar (see Table)
Thus it follows that: pS ≤ pE = 80 mbar / (3.36 – 1) = 34 mbar approx.
Result:
Under these conditions the WA 501 may be switched on at an inlet pressure (=
process pressure) of 34 mbar max. and continuously operated. Here the
requirements of temperature classification T2 are fulfilled at all times.
Related Electrical Equipment
Provided the pump is approved for operation in explosion hazard areas, all
electrical equipment supplied together with the pump like, for example,
valves, sensors, is also approved for operation in such areas. The same con-
ditions which apply to operation of the pump apply also to the accessories.
Related Accessories
The Oerlikon Leybold Vacuum accessories available for this pump are also
suited for operation in explosion hazard areas. The same conditions which
apply to operation of the pump apply also to the accessories. When using
other accessories with this pump, it needs to be ensured that such accesso-
ries are suited for operation in explosion hazard areas.
Areas of Application
The inside (the process gas side) of this vacuum pump is so designed and
rated that the occurrence of foreseeable ignition sources can be excluded
during normal operation. Provided the pump is operated within the limits of
the parameters specified in the Operating Instructions, the pump will offer a
normal degree of protection. It is therefore suited for operation under condi-
tions under which it is unlikely that explosive atmospheres are caused by
gases, vapors or mists in the air or should these occur then only rarely and
for a short period of time (i.e. Zone 2). The same conditions apply to outside
components of the pumps which have been certified.

ATEX
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If only the inside of the pump (process side) has been certified for use in
explosive atmospheres, then the pump itself must not be installed and
operated within explosion hazard areas.
Outside of the pump: Zone definitions
Areas in which explosive atmospheres (gases, vapors or mists) in the air can
occur are classified in three zones according to the frequency and the dura-
tion of the occurrence of an explosive atmosphere. These zones are desig-
nated as Zone 0, 1 and 2.
The definitions for these zones are described in the Annex I of the «Atex
Directives (Directive 99/92/EG) for the improvement of health protection and
safety of staff which might be endangered by explosive atmospheres».
Notes relating to the definitions for the three zones relating to areas with
explosive atmospheres are given in the Directive 99/92/EG and the corre-
sponding guide (COM (2003) 515), together with the European standard EN
60079-10 (Electrical apparatus for explosive gas atmospheres. - Part 10
Classification of hazardous areas). Additionally further information on the
avoid ance of explosions and on the topic of explosion protection can be
found in the Directive 99/92/EG and the corresponding guide.
This information can be downloaded from the EU Internet site.
Ignition Temperatures of Gases/Vapors
The pumps are suited only for applications in which potentially explosive gas
or vapor mixtures have an ignition temperature of over 200 °C (T3) or 135 °C
for T4.
The ignition temperatures of gases or vapors, sometimes also termed auto-
ignition temperature can be taken from the material safety data sheets.
The pump is not suited for operation in potentially explosive gas mixtures in
which the oxygen concentration is over 21% or if reactive, aggressive or cor-
rosive gases are present.
CAUTION