Oerlikon Leybold Vacuum TRIVAC NT16 User manual

TRIVAC NT16 / NT25
Rotary Vane Vacuum Pump
Operating Instructions 130002780_002_A0
®
In the case of an attached explosion hazard rated motor (category 3 i/o), the information
provided in the enclosed Operating Instructions for the electric motor must be observed!
Part Numbers
140 220
140 221
140 222
140 223
140 224
140 225
140 226
140 227
140 231
140 232
140 233
140 234
140 235
140 241
140 330
140 331
140 332
140 333
140 334
140 335
140 336
140 337
140 338
140 339
140 340
140 341
140 346
140 347

Important Safety Information 5
ATEX Directive and Flammable Gases Dilution 8
TRIVAC B ATEX - Categories 3 i and 3 i/o Vacuum Pump 9
1 Description 13
1.1 Design and Function 15
1.1.1 Operating Agents 17
1.2 Supplied Equipment 18
1.3 Technical Data 19
1.3.1 Motor Related Data 20
1.4 Ordering Data 22
1.5 Accessories 23
2 Transportation and Storage 24
3 Installation 25
3.1 Placement 25
3.2 Conforming Utilization 26
3.3 Connection to the System 28
3.4 Electrical Connections 30
4 Operation 32
4.1 ATEX Directive and Flammable Gases Dilution 32
4.2 Media Compatibility 33
4.3 Start Up 33
4.4 Operation 34
4.4.1 Pumping of Non-Condensable Gases and Vapours 34
4.4.2 Pumping of Condensable Gases and Vapours 34
4.4.3 Operating Temperature 35
4.5 Shutdown 35
Contents
2
Page

5 Maintenance 37
5.1 Oerlikon Leybold Vacuum Service 37
5.2 Maintenance Plan (Recommendation) 38
5.3 Checking the Oil 39
5.4 Oil Change 40
5.5 Cleaning the Inlet Screen 42
5.6 Checking the Coupling 42
5.7 Replacing the Outer Shaft Seal 42
6 Troubleshooting 45
7 Wearing and Original Parts 47
8 Waste Disposal 48
EC Declaration of Conformity 49
EC Manufacturer’s Declaration 50
Contents
3
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Page

4130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Safety Information
We strongly recommend that you read and observe the information provi-
ded in these Operating Instructions before installing and commissioning
the TRIVAC NT with care so as to ensure optimum operation of the pump
right from the start.
The icon indicates procedures in these Operating Instructions that must
be strictly observed to prevent hazards to persons.
High electrical voltages! When touching parts at high-voltage there is the
risk of suffering severe injury by an electric shock!
Covers which are marked with this icon must only be removed by trained
electricians after having reliably disconnected the electric power source.
Indicates procedures that must strictly be observed to prevent damage to,
or destruction of the equipment.
Emphasises additional application information and other useful information
provided within these Operating Instructions.
The Oerlikon Leybold Vacuum TRIVAC NT 16 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
throughout the Operating Instructions. The TRIVAC must only be ope-
rated 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 regard-
ing specific requirements and regulations. Address any further safety, ope-
ration and/or maintenance questions to your nearest Oerlikon Leybold
Vacuum office.
Figures
The references to diagrams, e.g. (4/1/2) consist of Chapter No., consecutive
Fig. No. within the chapter and the Item No. in the figurein that order.
We reserve the right to modify the design and the specified data. The illustra-
tions arenot binding.
Caution
Warning
Note
Warning

5
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Important Safety Information
Failure to observe the following precautions could result in serious
personal injury!
■Before beginning with any maintenance or service work on the TRIVAC
NT, disconnect the pump from all power supplies (lockout/tagout).
■Do not operate the pump with any of the covers removed. Serious injury
may result.
■If exhaust gases must be collected or contained, do not allow the exhaust
line to become pressurised.
■Make sure that the gas flow from the exhaust port is not blocked or
restricted in any way.
■Only those pumps which are equipped with an Atex certified motor are
suited for operation in explosion hazard areas.
■The standard version of the TRIVAC NT is not suited for operation in
explosion hazard areas.
■Before starting up for the first time, the motor circuit must be equipped
with a suitable protective motor switch. Please take note of the informati-
on in these Operating Instructions and on the electric motor (wiring dia-
gram).
■When pumping toxic, chemical, radioactive and corrosive gases as well as
pyrophorous substances, the operating company is under the obligation
to comply with the national and international safety regulations and guide-
lines. Regarding the suitability of the TRIVAC NT pumps for special appli-
cations in which such gases, respectively substances shall be pumped,
Oerlikon Leybold Vacuum should be consulted first.
■The TRIVAC NT pumps including the accessories are fundamentally not
suited for pumping of combustible and explosive gases or vapours.
Mixtures of substances may, regarding the fire and explosion risk be criti-
cal or uncritical. The operating company is under the commitment to ana-
lyse this and rate the hazardpotential accordingly so as to therefrom deri-
ve the necessarysafety measures which must be introduced.
■If ignitable or pyrophorous substances are present in the equipment you
must ensure that:
■no air can enter into the equipment,
■the system is leak-tight,
■by means of purging with inertgas (for example through a nitrogen
purge) all ignitable gases or vapours which enter into the pump through
the pump’s inlet are diluted and/or by means of an inert gas purge the
concentration of ignitable gases in the pump and in the exhaust gas line is
reduced to less than a quarter of the lower explosion limit published for
the respective gases.
Safety Information
Warning

6130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
■Avoid exposing any part of the human body to the vacuum.
■Never operate the TRIVAC NT without a connected intake line or without
fitting a blank flange.
■The location at which the TRIVAC NT (including its accessories) is ope-
rated should be such that angles over 10° from the vertical are avoided.
■The location of the TRIVAC NT should be such that all controls are easily
accessible.
■Under certain ambient conditions the TRIVAC NT may attain a tempera-
ture of over 70 °C (158 °F). There then exists the danger of receiving
burns. Note the symbols on the pump pointing to the hazards, and in the
case of a hot pump wear the required protective clothing.
■All work on the pumps “at operating state temperature“ shall only be done
while wearing protective gloves. Always let the pump cool down before
any servicing and maintenance work.
■The noise level produced by the TRIVAC NT is 54 dB(A) max.
Suitable hearing protection measures must be introduced.
■Before pumping oxygen (or other highly reactive gases) at concentrations
exceeding the concentration in the atmosphere(> 21 % for oxygen) it will
be necessary to use a special pump. Such a pump will have to be modi-
fied and de-greased, and an inert special lubricant (like PFPE) must be
used.
■Before operating the TRIVAC NT check first compatibility with the pumped
media so as to avoid hazardous conditions during operation right from the
start. Observe all applicable safety standards and regulations.
■After a mains power failurethe pump will run up automatically again. This
also applies in the case of an emergency shutdown. In order to prevent
the pump from running up automatically again, the pump must be inte-
grated within a control arrangement such that it can only be switched on
manually again after the mains power has returned.
■When operating the pumps at gas throughput, it is urgently recommen-
ded to connect an exhaust filter or use a suitable exhaust line. Here, the
exhaust line must slope down and away from the pump.
■When moving the TRIVAC NT always use the allowed means. A lifting eye
is provided as standardon the pump.
■The pump when filled with oil must only be moved in its vertical position.
Spilled oil involves the risk of falling.
■PFPE:During thermal decomposition at temperatures over 290 °C toxic
and corrosive gases are released. When handling PFPE keep it way from
open fires. Do not smoke in the work area.
■DOT 4:When swallowing the operating agent there is the danger of being
poisoned.
■DOT pumps are not suited for operation in explosion hazard areas or for
pumping explosive substances.
Safety Information
Warning

Failure to observe the following precautions could result in damage to
the pump.
■Do not allow the ingestion of small objects (screws, nuts, washers, pieces
of wire, etc.) through the inlet port. Always use the inlet screen which is
supplied with every pump.
■Do n
no ot tuse the pump for applications that produce abrasive or adhesive
powders or condensable vapours that can leave adhesive or high viscosi-
ty deposits. Please contact our Sales or Service offices to select a suit-
able separator. Also please contact our Sales or Service when planning to
pump vapours other than water vapour.
■This pump is suited for pumping water vapour within the specified water
vapour tolerance limits.
■Avoid vapours that can condense into liquids upon compression inside
the pump, if these substances exceed the vapour tolerance of the pump.
■Before pumping vapours, the TRIVAC NT should have attained its opera-
ting temperature. The pump will have attained its operating temperature
about 30 minutes after starting the pump. During this time the pump
should be separated from the process, by a valve in the intake line, for
example.
■In the case of wet processes we recommend the installation of liquid
separators upstream and downstream of the pump as well as the use of
the gas ballast.
■The exhaust line should be laid so that it slopes down and away from the
pump so as to prevent condensate from backstreaming into the pump.
■The entry of particles and fluids must be avoided under all circumstances.
■Reactive or aggressive substances in the pump chamber may impair the
operating oil or modify it. In addition, such substances may be incompa-
tible with the materials of the pump (Viton, grey cast iron, aluminium,
steel, resins, glass etc.).
■Corrosion, deposits and cracking of oil within the pump are not allowed.
■Normal amounts of humidity within the range of the pump’s vapour tole-
rance will not significantly affect pump performance (when the gas ballast
is active).
■In the case of custom pumps (with part numbers deviating from those
stated in the EC Declaration of Conformity) please note the information
provided in the supplementary sheets.
■If mineral oil, PFPE and DOT come into contact they will emulsify. That’s
why the pumps must only be run with the type of lubricant specified for
the pump.
■Please note the change as to the ATEX temperature class in the case of
PFPE pumps. Suitability is restricted to T3 (gases and vapours with an
ignition temperature of over 200 °C).
Safety Information
7
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Caution

ATEX DIRECTIVE AND FLAMMABLE GASES DILUTION
The TRIVAC NT 16 and 25 Atex Category 3 pumps are designed according
to the requirements of Directive 94/9/EEC Group II, Category 3.
Depending on the respective catalogue number, these pumps are suited for
use under Atex category 3 conditions .
Never use a pump certified for Category 3 internal in an external potentially
explosive atmosphere, as the pump is not designed with respect to potential
ignition sources outside.
In the case of a potential external explosive atmosphere, use only pumps
certified for the ignition category 3 inside and outside.
During normal operation there is no potential source of ignition inside and
outside the pump but, according to the 94/9/EC directive, a rare malfunction
may occur with potential sources of ignition.
In normal operation, even if the pump is designed for flammable gases, the
operation procedure must ensure that the gases are not within their explosion
limits.
When flammable gases are pumped, the following safety measures must be
enforced:
■Prevent any atmospheric air from entering into the pump.
■Use an inert gas to dilute the flammable gas being pumped; the concen-
tration of flammable gas must not exceed 25% to 30% of the lower
explosion limit.
ATEX
8130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum

TRIVAC B ATEX - Categories 3 i and 3 i/o Vacuum Pump
Operating Instructions for Operation in Explosion Hazard Areas
The vacuum pumps from the line TRIVAC B Category 3 have been designed
and manufactured especially for the purpose of fulfilling the requirements of
Equipment Group II, Category 3 of the “ATEX Directive” (Directive 94/9/EG)
for conforming utilisation of equipment and protection systems in explosion
hazard areas”.
Classification and Marking of the Pump
In the case of the standard TRIVAC B the inside, i.e. the process gas side of
the pump fulfils the basic safety requirements of the EU Directive 94/9/EG.
The pump is supplied with an electric motor which is not ATEX certified and
has for this reason been marked as follows:
II (i) 3G IIC T4 (50 Hz / 60 Hz) X
This pump is not suited for being installed in explosion hazard areas.
Pumps where the inside and the outside of the pump fulfil the basic safety
requirements of the Directive, are supplied with an ATEX certified motor and
have been marked as follows:
II (i) 3G IIC T4 (50 Hz / 60 Hz) X
II (o) 3G IIC T3 (50 Hz / 60 Hz) X
Please note the change as to the ATEX temperature class in the case of
PFPE pumps. Suitability is restricted to T3 (gases and vapours with an
ignition temperature of over 200 °C).
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 operations and their related above ground systems which can
be endangered by mine gas and/or combustible dust.
(i)/(o) Specifies the category/conditions according to which the inside (i) (i.e.
sections of the equipment in contact with the process gas flow) and
the outside (o) of the equipment are classified provided these differ.
3Category 3 comprises equipment which is designed such that it can
be operated 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, vapours and mists but, in case such
an atmosphere should occur in spite of this then according to all pro-
bability only rarely and briefly. Equipment belonging to this category
ensures during normal operation the required degree of safety.
ATEX
9
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Note the ATEX temperature
class!

GFor areas with an explosive atmosphere caused by gases, vapours or
mists in the air.
The pump is not suited for utilisation in dusty areas.
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 require-
ments.
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
Exploding Group IIA or IIB.
T3, T4 Temperature class: classification of operating means depending on
their maximum surface temperature, in agreement with the following
table:
Temperature class Maximum surface
temperature (°C)
T1 450
T2 300
T3 200
T4 135
T5 100
T6 85
Pumps belonging to temperature class T4 (with 50 Hz electric motors)
must only be operated with gases or vapours which exhibit an ignition
temperature of over 135° C.
Pumps belonging to temperature class T3 (with 60 Hz electric motors)
must only be operated with gases or vapours which exhibit an ignition
temperature of over 200° C.
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 deman-
ded by EN 13463-1.
50 Hz
60 Hz Frequency of the electric motor – at a higher frequency the pump will
run faster and produce a higher surface temperature.
TaPermissible ambient temperature for operating the pump
12 °C < Ta < 40 °C.
XSpecial operating conditions need to be complied with! The special
conditions and notes provided in the Operating Instructions apply.
ATEX
10 130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum

Protective Measures
Hot Surfaces
During normal operation of the vacuum pump, compression of the gases
causes the surfaces to heat up resulting in hot surfaces. Tests have shown in
the case of conforming operation of the pump (in accordance with these
instructions) that at the inside of the pump which might come into contact
with a potentially explosive atmosphere attains during operation with a 50 Hz
motor a maximum temperature of less than 135° C and during operation with
a 60 Hz motor a maximum temperature of less than 200° C.
The maximum temperatures are attained during continuous operation at an
inlet pressure ranging between 300 and 500 mbar. The actually attained tem-
perature depends on the inlet pressure.
The outside of the pump may attain under these conditions a surface tempe-
rature of over 80° C. The maximum temperature is in the case of operation
with a 50 Hz motor less than 135° C and in the case of operation with a 60
Hz motor less than 200° C.
(These temperatures include safety margins in accordance with EN 13463-1.)
Higher maximum surface temperatures can occur when filling and operating
the pump with types of oil which differ from the Leybold oil N 62. This is due
to the frequently worse lubrication and cooling properties of such oil, PFPE in
particular.
Hot Exhaust Gases
Due to the compression of the gases, the pump will produce in the case of
normal operation hot exhaust gases. The exhaust gas temperatures do not
exceed the maximum surface temperatures stated for the pump.
For this reason the exhaust gases need to be disposed of through a suitable
exhaust gas system.
Mechanical Sparks
During normal operation no mechanically produced sparks occur since the
internal surfaces of the pump are covered with oil. The external fan and the
fan cover are so designed that a sufficient clearance is maintained thereby
excluding the possibility of a contact.
Sucking in of particles into the pump needs to be avoided so as to prevent
the formation of hot spots due to friction.
Electric Sparks
These can be caused by the electric motor and the accessories supplied
with the pump. If the pump has been approved for operation in areas with an
explosive atmosphere, then motor and supplied accessories have the same
classification as the pump. Motor and accessories need to be installed and
used in agreement with the enclosed manufacturer’s information.
ATEX
11
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Note
Note
Warning

Static Electricity
The pump needs to be sufficiently grounded so as to avoid any electrostatic
charging. This is attained when properly connecting the electric ground con-
ductor to the motor. During normal operation no hazardous generation of
charges will occur on the plastic coupling or the fan (for further information
relating to the hazards caused by static electricity, see CENELEC report
CLC/TR 50404: 2003 Electrostatics - Code of practice for the avoidance of
hazards due to static electricity).
Only original Leybold oil filters and gas inlet filters must be used since these
have been designed such that proper connection to ground is ensured. Dust
on the surfaces must only be removed using a moist piece of cloth so as to
exclude the possibility of generating sparks.
Chemical Reactions
The pump must not be used in connection with reactive or corrosive gases,
which might result in an exothermal chemical reaction.
Additional Safety Measures
Overheating the pump can give rise to temperatures which exceed the maxi-
mum permitted surface temperature.
In order to prevent overheating, installation and maintenance need to be
done in accordance with the information provided in these Operating
Instructions. Especially the correct oil level needs to be maintained.
The oil must be exchanged within the recommended interval or earlier if con-
taminated by the process gas.
Additional Maintenance Requirements
In those cases where dust can deposit itself on the pump or the motor surfa-
ces, measures must be introduced which ensure that such deposits are
removed on a regular basis.
In order to ensure that the defined safety level is complied with, use only ori-
ginal Leybold spare parts.
In addition to the maintenance work described in the Operating Instructions
every 15.000 operating hours or every three years a complete refurbishment
of the pump including a replacement of the bearings and the couplings
should be scheduled.
ATEX
12 130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum

13
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Description
1 Description
The TRIVAC NT pumps are oil sealed vacuum pumps of the rotary vane type.
The TRIVAC NT 16 ATEX and NT 25 ATEX are two-stage pumps. The num-
ber in the type designation (16 or 25) indicates the pumping speed of the
pump in m3· h-1.
The vacuum pumps from the line TRIVAC NT Category 3 have been desi-
gned and manufactured especially for the purpose of fulfilling the require-
ments of Equipment Group II, Category 3 of the “ATEX Directive” (Directive
94/9/EG) for conforming utilisation of equipment and protection systems in
explosion hazard areas”
TRIVAC NT pumps are capable of pumping gases and vapours and evacua-
ting vessels or vacuum systems down into with the medium vacuum range.
The standard versions of the pump are not suited for pumping of oxygen
exceeding the concentration as found in the atmosphere, and are also not
suited for pumping of hazardous gases or extremely aggressive or corrosive
media.
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 conditi-
ons under which it is unlikely that explosive atmospheres are caused by
gases, vapours 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.
Fig. 1.1 TRIVAC NT with accessories
1 Oil filter OF 4-25
1a Adapter for oil filter
2Exhaust filter AF 16-25
2a Horizontal connection
3 Condensate trap AK 16-25
3a Horizontal connection
11a 3a 2a
Operating Principle
3 2

14 130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Description
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.
Areas in which explosive atmospheres (gases, vapours or mists) in the air can
occur are classified in three zones according to the frequency and the durati-
on of the occurrence of an explosive atmosphere.
These zones are designated 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 avoi-
dance 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:
www.europa.eu.int:
http://europa.eu.int/eur-lex/de/com/cnc/2003/com2003_0515de.html
http://europa.eu.int/eur-lex/en/com/cnc/2003/com2003_0515en.html
http://europa.eu.int/eur-lex/fr/com/cnc/2003/com2003_0515fr.html
Alternatively the guide of the EU commission on ATEX (reference number.
COM 2003 0515) can also be read by accessing the link
http://europa.eu.int/eur-lex/
Conforming utilisation of the Trivac pumps and compliance with the statutory
requirements of the ATEX operator directive (99/92/EG) is the responsibility of
the operator.
The drive motor of the TRIVAC B is directly flanged to the pump at the cou-
pling housing. The pump and motor shafts are directly connected by a fle-
xible coupling. The bearing points of the pump module are force lubricated
sliding bearings. All controls as well as the oil-level glass and the nameplate
are arranged on the front. All connections are to be found at the sides of the
pump. The oil-level glass is provided with prisms for better observation of the
oil level.
The pump module consists of assembly parts which are pin-fitted so as to
allow easy disassembly and reassembly. The pump module can be easily
removed without special tools.
Note
Zone 0, 1 and 2
Responsibility of the operator
Drive concept

15
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
1.1 Design and Function
The rotor (1.2/7), mounted eccentrically in the pump housing, has two radially
sliding vanes (1.2/5) which divide the pump chamber into several compart-
ments. The volume of each compartment changes periodically with the rotati-
on of the rotor.
As a result, gas is sucked in at the intake port (1.2/1). The gas passes
through the dirt trap sieve (1.2/2), flows past the open anti-suckback valve
(1.2/3) and then enters the pump chamber (1.2/6). In the pump chamber, the
gas is passed on and compressed, after the inlet aperture is closed by the
vane.
The oil injected into the pump chamber is used for sealing and lubricating.
The slap noise of the oil in the pump which usually occurs when attaining the
ultimate pressure is prevented by admitting a very small amount of air into the
pump chamber.
The compressed gas in the pump chamber is ejected through the exhaust
valve (1.2/10). The oil entrained in the gas is coarsely trapped in the internal
demister (1.2/11); there the oil is also freed of mechanical impurities. The gas
leaves the TRIVAC NT through the exhaust port.
During compression, a controlled amount of air - the so-called gas ballast -
can be allowed to enter the pump chamber by opening the gas ballast valve
Description
Fig. 1.2 Sectional drawing of the TRIVAC NT
1 Intake port
2 Inlet screen
3 Anti-suckback valve
4 Intake channel
5Vane
6 Pump chamber
7 Rotor
8Connection for inert gas ballast
9 Exhaust channel
10 Exhaust valve
11 Internal demister
12 Spring buckles
13 Cover plate, connection for oil filter

16 130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Description
(position I). The gas ballast stops condensation of vapours in the pump
chamber up to the limit of water vapour tolerance as specified in the techni-
cal data for the pump.
The gas ballast valve is opened and closed in two steps by turning the gas
ballast knob (3.1/5) on the top.
To enable the TRIVAC NT to be used at intake pressures as high as 1,000
mbar, a special lubricating system was developed featuring force-lubrication
of the sliding bearings.
An oil pump (1.3/6) pumps the oil from the oil reservoir (1.3/5) into a pressu-
re-lubrication system which supplies oil to all bearing points (1.3/2). From
there the oil enters the pump chamber area (1.2/6) of the vacuum pump.
The oil pump is fitted in the front end plate on the coupling side of the pump
module. The oil suction line is placed low, resulting in a large usable oil reser-
voir.
The oil is separated from the gas in the TRIVAC NT in two steps as described
above. First, small droplets are coalesced into large drops in the internal
demister (1.2/11) fitted above the exhaust valve (1.2/10). Then, the large
drops fall into the oil reservoir as the exhaust gas is diverted by the inner
walls of the oil case. Thus a low loss of oil is obtained. This and the large
usable oil reservoir ensure long intervals between oil changes even at high
intake pressures.
The vacuum is maintained by the TRIVAC NT by an integrated hydropneuma-
tic anti-suckback valve (1.2/3) which is controlled via the oil pressure.
During operation of the TRIVAC NT the control piston (1.4/3) remains sealed
against a spring (1.4/2) by the oil pressure. The valve disc (1.4/6) of the anti-
suckback valve is held at the lower position by its own weight (valve open).
When the pump stops (because it has been switched off or because of a fail-
ure), the oil pressure drops and the spring (1.4/2) presses the control piston
(1.4/3) up. Thus a connection is provided between the oil case or the oil
reservoir (1.4/1) and the piston (1.4/4) of the anti-suckback valve. Due to the
pressure difference between the oil case and the intake port the oil presses
the piston (1.4/4) up and the valve plate (1.4/6) against the valve seat (1.4/5).
The quantity of oil in the oil reservoir (1.4/1) prevents the entry of air into the
intake port (1.2/1) at the beginning of this process.
After the oil has flowed out from the reservoir and when the valve plate rests
on the valve seat, air follows in, which vents the pump chamber and forces
the valve disc (1.4/6) against its seat. This effectively prevents backstreaming
of oil. The anti-suckback valve (1.2/3) operates independently of the opera-
ting mode of the pump, i.e. also with gas ballast.

17
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
1.1.1 Operating Agents
The standard TRIVAC NT pumps are either ready for operation with mineral
oil, diester oil, the operating agent DOT 4 (brake fluid) or with the special
lubricant, perfluoropolyther (PFPE).
If mineral oil, PFPE and DOT come into contact they will emulsify. That’s why
the pumps must only be run with the type of lubricant specified for the pump.
If you want to change the type of lubricant Oerlikon Leybold Vacuum should
do the change.
When handling PFPE you should observe the following:
Please note the change as to the ATEX temperature class in the case of
PFPE pumps. Suitability is restricted to T3 (gases and vapours with an
ignition temperature of over 200 °C).
During thermal decomposition at temperatures over 290 °C toxic and cor-
rosive gases are released. When handling PFPE keep it way from open
fires. Do not smoke in the work area.
Touch the inner sections of the pumps only while wearing clean gloves, and
use clean tools;
Do the necessary work in clean and dry rooms;
After having removed the pump from its packaging, start it up as quickly as
possible;
While working on the pump, do not eat, drink or smoke.
As cleaning agents solvents based on hydrofluorether compounds may be
used.
Information on the pump’s operating agent DOT 4
The pumps are equipped with special seals which are capable of resisting
exposure to brake fluids. These pumps must only be operated with brake
fluids in accordance with DOT 3 and DOT 4 or alternative operating agents
which have been approved by Oerlikon Leybold Vacuum.
Description
Fig. 1.3 Schematic of the lubricating system
1 Accessories
2Bearings
3 Non-return valve
4 Pump chamber of the TRIVAC
5 Oil reservoir
6 Oil pump
Warning

18 130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Description
Store the operating agent only in its original container in a clean and dry
place. Keep the container firmly sealed.
DOT pumps are not suited for operation in explosion hazard areas or for
pumping explosive substances.
Any contamination by dirt, water, crude oil products or other materials may
result in damage to the pump.
Operating agent which has been used must never be re-used.
The operating agent will attack (dissolve) paint.
When swallowing the operating agent there is the danger of being
poisoned.
Always keep the operating agent in a sealed container and out of reach of
children.
1.2 Supplied Equipment
The equipment supplied with the TRIVAC NT pump includes:
Pump with motor, including initial filling of oil
1 centering ring,
1 centering ring with dirt trap,
2 clamping rings DN 25 KF.
As protection during shipment, the connection ports are each blanked off by
rubber diaphragms and supporting rings.
TRIVAC NT pumps with single-phase AC motor are supplied with switch,
built-in thermal motor protection switch and plug for the mains cable.
For TRIVAC NT pumps with three-phase AC motor, the switch, motor protec-
tion switch, mains cable etc. are not included.
Fig. 1.4 Hydropneumatic anti-suckback valve
1 Oil reservoir 5 Valve seat
2 Spring 6 Valve disk
3 Control piston 7 Gas inlet
4 Anti-suckback piston
Warning
Warning

19
130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Description
1.3 Technical Data
TRIVAC NT 16 TRIVAC NT 16
Nominal pumping speed 1) m3·h-1 18.9 29.5
Pumping speed 1)m3· h-116.5 25.7
Ultimate partial pressure without gas ballast 1)
with mineral oil mbar 10-4
with PFPE mbar 8 · 10-4
Ultimate total pressure without gas ballast 1)
with mineral oil mbar < 2 · 10-3
with DOT mbar 0.6
Ultimate total pressure with gas ballast 1)
with mineral oil mbar 5 · 10-3
with PFPE mbar 5 · 10-3
with DOT mbar 0.9
Water vapor tolerance 1)mbar 25
Water vapor capacity g · h-1 305 476
Oil filling, min./max. l 0.7 / 1.0 1.1 / 1.5
Noise level to DIN 45 635, dB (A) < 54
(without gas ballast at 50 Hz)
Admissible ambient temperature °C 12 - 40
Motor rating W 550/660
Nominal speed min-1 1500
Type of protection IP 44 for single-phase motor / 55 for 3-phase motor
Weight 3 ph / 1 ph motor kg 35 / 40 41 / 46
Connections, intake and exhaust side DN 25 KF
1) To DIN 28 400 ff
We can only guarantee that the pump will meet its specifications when
using the type of lubricant which has been specified by us.
Note

20 130002780_002_A0 - 12/2008 - © Oerlikon Leybold Vacuum
Description
1.3.1 Motor Related Data
Part No. LN-No. 1 ph or 3 ph Nominal voltage (V) Frequency Voltage Power (kW) Nominal (A) Size Region
(Hz) ± 5% range (V) current
140 220 E 110 002 715 95-120 / 190-252 50/60 +/- 5% 0.55 13.0 / 7.5 90 World
1 ph 95-120 / 190-242 0.66 10.0 / 5.0
140 231,
140 232, 140 233, E 110 002 716 218-242 50/60 +/- 5% 0.45/0.55 5.0 / 5.5 90 Euro
140 234, 140 235 1 ph
140 241 E 110 002 717 95-105 50 +/- 5% 0.55 9.5 90 Japan/US
1 ph 95-120 60 +/- 5% 0.66 10.0
140 221,
140 222, 140 223, E 110 002 712 200-240 / 380-415 50 +/- 10% 0.55 3.1-4.0 /1.5-1.6 90 World
140 224, 140 225 3ph 200-240 / 380-460 60 +/- 10% 0.66 3.1 /1.6
If the pump has been approved for use in explosion hazard areas, then all
electrical equipment like motor, valves, sensors, for example, is approved for
operation in these areas (the same conditions as for the pump apply).
Compliance with the enclosed operating information provided by the manu-
facturer of the electric motor needs to be ensured. When using other
motors, these must be rated as follows:
Pumping speed / m316 / 25 16 / 25
Frequency / Hz 50 60
Speed / min 1500 1800
Power / W 750 750
Related electrical equipment