vacuubrand MZ 2C EX User manual

page 1 of 75
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Chemistry diaphragm pumps
with
ATEX conformity
MZ 2C EX
MD 4C EX
MV 10C EX
MZ 2C EX + AK + EK
MZ 2C EX + IK + EK
MD 4C EX + AK + EK
MV 10C EX + AK + EK
Technology for Vacuum Systems
Instructions for use

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Dear customer,
Your VACUUBRAND diaphragm pump shall support you at your work for a long time without any trouble
and with full load output. Thanks to our large practical experience we attained much information how you
could add to an efcient application and to personal safety. Please read these instructions for use prior
to the initial start-up of your pump.
VACUUBRAND diaphragm pumps are the result of many years of experience in construction and practi-
cal operation of these pumps combined with the latest results in material and manufacturing technol-
ogy.
Our quality maxim is the ”zero fault principle”:
Every delivered diaphragm pump is tested extensively including an endurance run of 14 hours. Due to
this endurance run, also faults, which occur rarely, are reported an can be corrected. Every single dia-
phragm pump is tested on achievement of the specication after the endurance run.
Every VACUUBRAND pump leaving our factory achieves the specication. We feel obliged to
this high quality standard.
We are aware that the vacuum pump should not draw a part of the real work and we hope to contribute
with our products to an effective and trouble-free realisation of your work.
Yours
VACUUBRAND GMBH + CO KG
After sales service: Contact your local dealer or call [phone].
Attention: This manual is not available in all languages of the
EU. The user must not operate the device if he does not under-
stand this manual. In this case a technically correct translation
of the complete manual has to be available. The manual must
be completely read and understood before operation of the de-
vice and all required measures must be applied.
Trademark index:
VACUU•LAN® (US-Reg.No 3,704,401), VACUU•BUS®, VACUU•CONTROLTM, chemistry-HYBRIDTM,
Peltronic®, TURBO•MODETM, VARIO® (US-Reg.No 3,833,788), VARIO-SPTM, VACUUBRAND®(US-
Reg.No 3,733,388) and also the shown company logos are trademarks of VACUUBRAND GMBH + CO
KG in Germany and/or other countries.

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Contents
Safety information! .....................................................................................................6
General information............................................................................................................................6
Intended use.......................................................................................................................................6
Setting up and installing the equipment .............................................................................................6
Ambient conditions ...........................................................................................................................10
Operating conditions ........................................................................................................................10
Safety during operation ....................................................................................................................12
Maintenance and repair....................................................................................................................13
Notes regarding devices with ATEX conformity ....................................................14
Technical data ...........................................................................................................16
Wetted parts ....................................................................................................................................18
Pump parts ......................................................................................................................................18
Use and operation ....................................................................................................23
Installing in a vacuum system ..........................................................................................................23
During operation...............................................................................................................................28
Shutdown .........................................................................................................................................30
Troubleshooting .......................................................................................................31
Replacing diaphragms and valves..........................................................................32
Inspecting the overpressure safety valve .............................................................51
Notes on return to the factory .................................................................................53
Health and safety clearance form ...........................................................................54
EC Declaration of Conformity of the Machinery .......................................................71
➨DANGER indicates a hazardous situation which, if not avoided, will re-
sult in death or serious injury.
☞WARNING indicates a hazardous situation which, if not avoided, could
result in death or serious injury.
• CAUTION indicates a hazardous situation which, if not avoided, could
result in minor or moderate injury.
NOTICE is used to address practices not related to personal injury.
Caution! Hot surface!
Isolate equipment from mains before removing the cover.
NOTICE

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Safety information!
General information
☞Read and comply with this manual before installing or operating the equip-
ment.
☞Transport the pump at the provided handle.
Remove all packing material, remove the product from its packing-box, remove the
protective covers from the inlet and outlet ports and keep, inspect the equipment.
If the equipment is damaged, notify the supplier and the carrier in writing within three
days; state the item number of the product together with the order number and the
supplier’s invoice number. Retain all packing material for inspection.
Do not use the equipment if it is damaged.
If the equipment is not used immediately, replace the protective covers. Store the
equipment in suitable conditions.
Intended use
☞Use the equipment for the intended use only according to the ATEX conformity, e.
g. for pumping gas atmosphere without aerosol in a range form 0.1 to 1000 mbar
and a maximum inlet pressure (dynamic pressure) and outlet pressure of 1100
mbar (absolute).
☞The pump and all system parts must not be used on humans or animals.
☞ Prevent any part of the human body from coming into contact with vacuum.
☞Ensure that the individual components are only connected, combined and oper-
ated according to their design and as indicated in the instructions for use.
☞Comply with notes on correct vacuum and electrical connections, see section
”Use and operation”.
The pumps are marked with ”X” (according to EN 13463-1), i. e. restrictions of the
operation conditions:
• The pumps are designated for a low degree of mechanical stress and have to be
installed in a way so that they can not be damaged from outside.
Pumping units have to be installed protected against shocks from the outside and
against glass splinters in the event of breaking (implosion).
• The pumps are designated for an ambient and gas inlet temperature during oper-
ation of +10 to +40°C. Never exceed these ambient and gas inlet temperatures.
Use the equipment for the intended use only, i.e. for generation of vacuum in ves-
sels designed for that purpose.
Setting up and installing the equipment
Before system start-up of the pump or the complete system the user has to evaluate
in its entirety the explosion risks and takes adequate measures in application of the
principle of risk assessment.
The evaluation and the measures have to be laid down in an explosion protection
document before system start-up.
The pump/system must not be operated until operation without danger in explosive
atmosphere is ensured. Provide suitable control, protection and warning systems
even in the event of failure.
NOTICE
NOTICE
NOTICE

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The inner (pumped media) and outer part of the pump have to be evaluated
separately because of their different conformity (see also section ”Technical
data” and ”Notes regarding devices with ATEX conformity”).
The pumps are not suitable for pumping dust and have no approval for operation
below ground.
The pumps are not suitable for pumping self inammable substances, for substanc-
es which are inammable without air and explosive substances.
☞ Electrical and vacuum components might require a separate approval.
☞Include the components in the recurrent tests of tightness for pressure vessels, in
the case of hits and beats an intermediate leak test is required.
☞Due to the high compression ratio of the pumps, pressure at the outlet port might
be generated being higher than the max. permitted pressure compatible with the
mechanical stability of the system.
☞Always provide a free and pressureless exhaust pipeline.
☞Do not permit any uncontrolled pressurizing (e.g. make sure that the exhaust
pipeline cannot become blocked). If there is an exhaust isolation valve, make sure
that you cannot operate the equipment with the valve closed. Risk of bursting!
• Secure coolant hoses at the hose nozzles (e.g. with hose clip) to prevent their
accidental slipping.
• Comply with maximum permissible pressures at inlet and outlet and pressure
differences, see section ”Technical data”. Do not operate the pump with overpres-
sure at the inlet.
• Attention: Flexible elements tend to shrink when evacuated.
Provide a rm level platform for the equipment and check that the system to be
evacuated is mechanically stable and that all ttings are secure. Ensure a stable po-
sition of the pump without any mechanical contact except of the pump feet. Comply
with all applicable safety regulations.
Pumping units (pumps with vapour condenser) have to be installed protected
against hits from outside and protected against splinters (against implosion).
Adopt suitable measures prior to the rst use.
Obey all relevant requirements (regulations and guidelines) and adopt suitable safe-
ty measures.
☞ Pay attention to the max. permitted ambient temperature and make sure
ventilation is adequate especially if pump is installed in a housing or if
ambient temperature is elevated, install an external automatic ventilation
system if necessary.
If pumping hot process gases make sure that the maximum permitted gas inlet
temperature is not exceeded.
☞If the equipment is brought from cold environment into a room for operation,
allow the equipment to warm up (pay attention to water condensation on cold
surfaces).
☞The work clothing of the user must not lead to electrostatic discharge which may
ignite the explosive atmosphere.
NOTICE

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Inlet
☞Connection lines at the pump inlet have to be performed conductive grounded
and gas tight (designation of the pump connections see gures).
☞The diameter of the inlet pipeline should be at the least as large as the diameter
of the pump connection pipelines.
☞Obey max. inlet pressure (see ”Technical data”).
☞If there is a risk of ignition of gases or gas mixtures before or behind the pump the
user has to provide suitable safety devices against incoming of ames according
to EN 12874. The user must ensure the suitability concerning gas ow, chemical
resistance and safeness against clogging prior to use.
Outlet
☞ Connection lines at the pump outlet (small ange) have to be performed conduc-
tive grounded and gas tight (designation of the pump connections see gures).
☞The diameter of the inlet pipeline should be at the least as large as the diameter
of the pump connection pipelines.
☞Obey max. inlet pressure (see ”Technical data”).
Due to the high compression ratio of the pumps, pressure at the outlet port might
be generated being higher than the max. permitted pressure compatible with the
mechanical stability of the system.
☞Obey maximum permitted pressures and pressure differences, see section ”Tech-
nical data”. Do not operate the pump with overpressure at the inlet.
☞ Do not permit any uncontrolled pressurizing (e. g. make sure that the exhaust
pipeline cannot become blocked). If you have an exhaust-isolation valve, make
sure that you cannot operate the equipment with the valve closed. Risk of burst-
ing!
☞Ensure that the system design does not allow the exhaust pipeline to become
blocked. Lead away exhaust gas or condensate at the outlet of the pump and the
overpressure safety valve under consideration of all applicable safety measures.
Avoid backow of gases or condensate denitely.
☞Ensure that the system design does not allow the coolant outlet pipeline to be-
come blocked.
☞ Escaped and/or intentional or unintentional released inammable gases or va-
pours which may lead to danger of explosion have to be lead away safely or lead
to an appropriate place. If not possible enclose the gasses, vapours or mist safely
or dispose in an other way. In case of mixtures or different gases the measures
must consider the highest risk.
☞If there is a risk of ignition of gases or gas mixtures before or behind the pump the
user has to provide suitable safety devices against incoming of ames according
to EN 12874. The user must ensure the suitability concerning gas ow, chemical
resistance and safeness against clogging prior to use.
Check the overpressure safety valve at the outlet regularly.
☞Attention: If the exhaust pipeline is blocked the pumped gases may escape into
the environment through the overpressure safety valve. If necessary take appro-
priate measures.
If pumping dangerous gases install a second completely independent exhaust
pipeline instead of the overpressure safety valve. If necessary assemble a hose
nozzle instead of the overpressure safety valve to lead away the gases through
a second exhaust pipeline. Attention: Never combine the exhaust pipelines, i. e.
provide a sperate line for each exhaust.

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☞To control the faultless function of the diaphragm it could be recommendable
install a gas specic detector at the outlet of the inert gas purge. A signal from
the detector indicates a diaphragm crack. Switch off the pump immediately and
check diaphragms.
☞It is possible to leave out the inert gas purge if the surrounding of the pump is
zone 2 or not an explosive atmosphere.
☞ Without inert gas purge the pump outer part has the specication II 3G IIB T4 X.
Gas ballast
☞Use only inert gas for gas ballast.
☞We recommend the use of gas ballast when pumping condensable media.
☞Gas ballast connection lines (inlet and outlet) have to be performed conductive
grounded and gas tight (designation of the pump connections see gures).
☞Connect the inert gas connections at the gas ballast and the crankcase not serial
but parallel.
☞ Provide an external pressure limitation to a pressure of 1.1 bar absolute if inert
gas is connected to the pump or at an air admittance valve. The inert gas has
to be dry and pure. It could be recommendable to provide an appropriate control
system to supervise the inert gas ow which switches off the pump in case of
failure (e. g. absence of inert gas) if necessary.
Pumping at high inlet pressure may lead to overpressure at the gas ballast valve.
☞ Pumped gases or condensate might be pushed out in case the valve is open.
☞ The inert gas lines have to be chemical resistent due to possible backow.
Electrical connection
☞Electrical connection of the pump must be performed only by a suitable trained
and supervised personnel.
☞The motor cable for pumps in 230V version contains wires colour coded as fol-
lows: green or green and yellow: earth; blue or white: neutral; brown or black:
live.
☞ Provide a fuse for the mains cable (L and N) according to the current draw of the
motor, see ”Technical data”.
☞The earth connection of the device (potential equalization) has to be performed
only using the green or green/yellow earth connection wire. Connect the earth
connection wire of the device to the earth connection of the power supply line and
the potential equalization point of the environment of the device.
☞When using pumps with two motors absolutely connect both motors as described
above. Ensure that always both motors are running.
Inert gas purge
☞The user must take suitable precautions to prevent any formation of explosive
mixtures in the expansion chamber using inert gas to purge the housing. Other-
wise in case of a diaphragm crack, mechanically generated sparks, hot surfaces
or static electricity may ignite these mixtures.
☞Inert gas connection lines (inlet and outlet) have to be performed conductive
grounded and gas tight (designation of the pump connections see gures).
☞Connect the inert gas connections at the crankcase not serial but parallel.
☞ We recommend an inert gas purge of ≥ 1 l per minute.
☞ Provide an external pressure limitation to a pressure of 1.1 bar absolute if inert
gas is connected to the pump or at an air admittance valve. The inert gas has
to be dry and pure. It could be recommendable to provide an appropriate control
system to supervise the inert gas ow which switches off the pump in case of
failure (e. g. absence of inert gas) if necessary.

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The motor is protected by a thermal cutout with manual reset combined with an
overcurrent protection.
☞Avoid reliable high heat supply (e. g. due to hot process gases). Maximum per-
mitted gas and ambient temperature se ”Technical data”.
☞Make sure ventilation is adequate especially if pump is installed in a housing or if
ambient temperature is elevated, install an external automatic ventilation system
if necessary.
☞Ensure that in case of pumps with two motors both motors are switched on at
the same time, if not possible switch on the motor of the pump at the outlet rst.
Ambient conditions
To the best of our knowledge the equipment is in compliance with the requirements
of the applicable EC-directives and harmonized standards (see ”Declaration of con-
formity”) with regard to design, type and model, especially directive EN 61010-1.
This directive gives in detail conditions, under which the equipment can be operated
safely (see also IP degree of protection).
Adopt suitable measures in case of differences, e. g. using the equipment outdoors,
installation in altitudes of more than 1000 m above mean sea level, conductive pol-
lution or dewiness.
Pay attention to the permissible maximum ambient and gas inlet temperatures
(see ”Technical data”).
Operating conditions
The pumps have a conformity according to their specication to be installed in areas
and to pump out of areas which contain under normal operation conditions occasion-
ally a potential explosive atmosphere as a mixture of air with inammable gases or
vapours (category 2). Class of ignition and temperature see ”Technical data”.
The specication for category 2 for the outer part of the pump is only val-
id when purging the crankcase with inert gas. Without inert gas purging the
pump has the specication II 3G IIB T4 X for the outer part.
Ensure that the materials of the wetted parts are compatible with the pumped sub-
stances, see section ”Technical data”.
Attention: Never use the antistatic connection at the housing of the device to
connect the device to ground, use only the green or green and yellow connection
wire of the motor. Use the antistatic connection at the housing only to perform an
antistatic connection of other non-electronic devices and components, e. g. inlet
and outlet vacuum hoses or something similar. Never lead away short-circuit cur-
rents using this connection. External electric devices have to be connected at the
potential equalization point of the environment separately and independent of this
device.
☞Equipment must be connected only to a suitable fused and protected electrical
supply and a suitable earth point by suitable trained personnel. Failure to connect
the motor to ground may result in deadly electrical shock.
☞Check that mains voltage and current conform with the equipment (see rating
plate).
☞Obey notes regarding the motor in section ”Instructions manual: Explosion
proof motors”, see below.

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Electronic equipment is never 100% fail-safe. This may lead to an indenite status of
the equipment. Provide protective measures against malfunction and failure.
☞Operating the pump, stand still of the pump or operating the air admittance valve
must not lead to a critical dangerous situation under any circumstances.
Ensure that in case of failure the pump and the vacuum system always will turn into
a safe status.
☞In case of leaks in the manifold or diaphragm cracks pumped substances might
be released into the environment or into the pump housing. To reduce the risk of
leaks, ask for a diaphragm pump with additional safety diaphragm.
☞Obey especially notes on operation and use and maintenance.
☞Failure of the pump (e. g. by power failure) or connected components, parts of
the supply (e. g. coolant) or change of parameters (e. g. increase of pressure
in the coolant system) must not lead to a critical dangerous situation under any
circumstances.
☞Adopt suitable measures to prevent the release of dangerous, explosive, corro-
sive or polluting uids.
☞If pumping different substances, it is recommended to purge the pump with air
or inert gas prior to changing the pumped media in order to pump out residues
and to avoid reactions of the pumped substances with each other and with the
pump materials.
Take into consideration interactions and chemical reactions of the pumped
media. Ensure that the materials of the wetted parts are compatible with the
pumped substances, see section ”Technical data”.
☞The valves and the diaphragms are wear parts. Replace the diaphragms and
valves at the latest at 90% of the typical lifetime or immediately at higher noise
level. The typical lifetime of a diaphragm is 15000 operation hours when pumping
non-corrosive or non-condensable gases, if necessary provide an operation time
counter.
☞Check the overpressure safety valve between the pump stages (only pumps with
four cylinders) regularly and replace at the latest at 90% of the typical lifetime
(typical lifetime: 15000 operation hours).
☞Take adequate precautions to protect people from the effects of dangerous sub-
stances (chemicals, thermal decomposition products of uoroelastomers), wear
appropriate safety-clothing and safety glasses.
☞Obey applicable regulations when disposing of chemicals. Take into considera-
tion that chemicals may be polluted.
☞Adopt suitable measures to prevent contamination of the pumped substances or
the environment.

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Use only genuine spare parts and accessories.
☞Otherwise safety and performance of the equipment as well as the electromag-
netic compatibility of the equipment might be reduced.
☞If not using genuine spare parts the ATEX conformity becomes invalid.
Do not start the pump if the pressure difference between inlet and outlet port ex-
ceeds 1.1 bar at maximum.
Prevent the backpressure of gases and the backow of condensates.
Never suck liquids or dust into the pump.
Ensure that in case of failure the pump and the vacuum system always will turn into
a safe status.
Provide appropriate protective measures (i.e. precautions which allow for the re-
quirements of the respective application) even for the case of failure and malfunc-
tion.
Failure of the pump (e.g. due to power failure) or of connected components, parts
of the supply or change of parameters must not lead to a critical dangerous situa-
tion under any circumstances. In case of diaphragm cracks or leaks in the manifold
pumped substances might be released into the environment or into the pump hous-
ing or motor. Comply especially with notes on operation and use and maintenance.
• Due to the residual leak rate of the equipment, there might be an exchange of
gas, albeit extremely slight, between the environment and the vacuum system.
Adopt suitable measures to prevent contamination of the pumped substances or
the environment.
Safety during operation
➨Adopt suitable measures to prevent the release of dangerous, toxic, explosive,
corrosive, noxious or polluting uids, vapours and gases. In case install an ap-
propriate collecting and disposal system and take protective action for pump and
environment.
➨ Prevent any part of the human body from coming into contact with vacuum.
➨ Potentially explosive mixtures at the outlet of the pump have to be drained ap-
propriately, sucked off or diluted with inert gas to non-explosive mixtures.
☞ Pay attention to the symbol ”hot surfaces” on the equipment. Adopt suitable
measures to prevent any danger arising from the formation of hot surfaces or
electric sparks. Provide a suitable protection against contact if necessary.
☞Always provide free and pressureless exhaust pipelines.
☞Ensure that the coolant outlet pipeline is always free and that it cannot get
blocked.
Check liquid level in both catchpots regularly and drain condensate in time.
☞ Pumping at high inlet pressure may lead to overpressure at the gas ballast
valve. Pumped gases or condensate might be pushed out in case the valve is
open. If an inert gas supply is connected, ensure that the inlet pipeline is not con-
taminated.
• Comply with applicable regulations when disposing of chemicals. Take into con-
sideration that chemicals may be polluted.
Take adequate precautions to protect people from the effects of dangerous sub-
stances (chemicals, thermal decomposition products of uoroelastomers), wear
appropriate safety-clothing and safety glasses.

page 13 of 75
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the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
Maintenance and repair
Wear parts have to be replaced regularly. In normal use, the lifetime of the dia-
phragms and valves is typically 15,000 operating hours. Bearings have a typical du-
rability of 40000 h.
• The motor capacitors have to be replaced after 200000 start/stop cycles at the
latest. If an overaged motor capacitor fails it might get hot and even melt and may
cause a ame to form which could be dangerous for persons and equipment
in the vicinity. The capacitors have to be replaced only at the factory.
Use only genuine spare parts and accessories.
☞Otherwise safety and performance of the equipment as well as the electromag-
netic compatibility of the equipment might be reduced.
☞If not using genuine spare parts the ATEX conformity becomes invalid.
Ensure that maintenance is done only by suitable trained and supervised techni-
cians.
➨Isolate equipment from mains and wait two minutes before starting mainte-
nance to allow the capacitors to discharge.
• Before starting maintenance vent the pump, isolate the pump and other compo-
nents from the vacuum system. Allow sufcient cooling of the pump. Drain con-
densate, if applicable.
☞Ensure that the pump cannot be operated accidentally. Never operate the
pump if covers or other parts of the pump are disassembled. Never operate
a defective or damaged pump.
☞Attention: The pump might be contaminated with process chemicals which have
been pumped during operation. Ensure that the pump is decontaminated before
maintenance and take adequate precautions to protect people from the effects of
dangerous substances if contamination has occurred.
☞Take adequate precautions to protect people from the effects of dangerous sub-
stances (chemicals, thermal decomposition products of uoroelastomers), wear
appropriate safety-clothing and safety glasses.
☞To avoid danger due to electrostatic ignition wipe the device or parts of the de-
vice only with a humid cloth.
In order to comply with law (occupational, health and safety regulations, safety at
work law and regulations for environmental protection) vacuum pumps, components
and measuring instruments returned to the manufacturer can be repaired only when
certain procedures (see section ”Notes on return to the factory”) are followed.

page 14 of 75
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This information sheet does not replace the instructions for use!
In directive 89/391/EWG the European Union has dened requirements for safety at work, which later
have been detailed for explosive atmospheres in the directive 1999/92/EG.
The requirements to equipment for operation in explosive atmospheres have been dened in the direc-
tive 94/9/EG (also known as ATEX 100a or ATEX 95). In 1996 this directive was implemented into Ger-
man law (11. Geräteschutzverordnung).
Concerning technology these directives only state general requirements. Technical details and test pro-
cedures are „recommended“ in European standards (e.g. for equipment with ATEX conformity: EN 1127,
E50014ff, EN 60079, EN 13463ff.).
Since July 1st 2003 equipment intended for use in potentially explosive atmospheres shall only be sold
if the equipment is in accordance with directive 94/9/EG (ATEX). This applies only to new equipment.
The repair of equipment sold prior to July 1st, 2003 is not affected. Pumps of prior design (pumps with
Ex-approved motor only) must not be brought to the market anymore.
Requirements to user and manufacturer of equipment according to ATEX:
The user of a system according to ATEX has to analyse the overall explosion risks according to direc-
tive 1999/92/EC and has to take adequate measures by means of a risk assessment. The evaluation
and validation of measures has to be documented in an explosion protection document, specifying
among other things the areas classied as potentially explosive (see below). The inner part of the pump
(pumped gases) and the environment of the pump (outer explosion protection) have to be evaluated
separately. Often the requirements will be different.
The responsibility for the classication of areas with potentially explosive atmospheres into
zones and for the specication of requirements to the equipment (category of equipment, class
of ignition, temperature class etc.) is accountable strictly to the operator of the system.
The equipment used has to comply with these requirements. VACUUBRAND does not advise
customers concerning requirements to the equipment under the specic aspects of the cus-
tomers applications.
Equipment with ATEX-conformity is to be used by appropriately instructed personnel only.
ATEX marking, intended use:
The marking of the equipment corresponding with the standards (see above) gives the areas in which
the equipment may be used according to its intended use.
Technical data, safety notes and intended use:
See instructions for use!
The equipment must only be used if the instructions for use are read, fully understood and
obeyed.
Clean, check and maintain equipment regularly.
Do never operate a defective equipment.
Notes regarding devices with ATEX conformity

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Electrical connection:
VACUUBRAND diaphragm pumps with ATEX-conformity are equipped with a 230 V / 50 Hz single-
phase motor and are protected by a thermal cutout with manual reset combined with an overcurrent
protection.
See instructions for use concerning notes on electrical connection
Where applicable the motors can be connected directly to an appropriate power supply by suitably
trained and authorised personnel (electrician). It is the responsibility of the user to meet the require-
ments of explosion protection in the power supply and connection area.
Vacuum and outlet connections:
See instructions for use: Make sure that all mechanical connections
are always gas tight and electrically conducting.
The exhaust pipeline must be designed in a way that it cannot become blocked.
If the exhaust pipeline becomes blocked, the overpressure safety device at the pump releases poten-
tially dangerous gases into the environment. Take appropriate safety measures (see instructions for
use).
Evaluate the risk of explosion for the release of pumped gases at the outlet of the pump.
Use and connection of inert gas supply:
For external ATEX equipment category 2G (e.g. for use in Ex-zone 1) the crank case of the pump has to
be ushed with inert gas (e.g. nitrogen). A ow of approx. 1 l/min (at atmospheric pressure) is sufcient.
If necessary the ow should be monitored using a ow meter. Without inert gas purge the pump has
external equipment category 3G. This means the pump has to be used in this case only in a surrounding
with Ex - zone 2 (or no Ex-zone).
It is recommended to install a gas detector (specic to the pumped gas) at the outlet of the inert gas tub-
ing. The maximum permitted overpressure at the inert gas outlet is 0.1 bar (Check the ow rate through
the gas detector!). A positive signal from the detector indicates a diaphragm failure. In this event switch
off the pump immediately and check the pump.
In the case of pumping condensable vapours, use gas ballast. Connect inert gas with maximum
overpressure of 0.1 bar to the gas ballast inlet (see instructions for use).
Inlet of air into the gas ballast must never lead to formation of an explosive mixture inside the
pump or at the outlet of the pump!

page 16 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
Technical data
Type
MZ 2C EX
MZ 2C EX
+ AK + EK
MZ 2C EX
+ IK + EK
MD 4C EX
MD 4C EX
+ AK + EK
MV 10C EX
MV 10C EX
+ AK + EK
ATEX approval
Inner part (pumped gases)
Outer part
Surrounding of the pump with inert gas purge
Surrounding of the pump without inert gas purge
Motor
II 2G IIC T3 X
II 2G IIB T4 X
II 3G IIB T4 X
see motor rating plate
Max. pumping speed* according to
ISO 21360 m3/h 1.9 3.7 8.1
Ultimate vacuum* (absolute) without
gas ballast mbar 12 3 2
Ultimate vacuum* (absolute) with
gas ballast mbar 18 10 10
Max. permitted pressure at the inlet
and the outlet (absolute) bar 1.1
Max. permitted pressure difference
between inlet and outlet bar 1.1
Max. permitted pressure at inert gas
connection (absolute) bar 1.1
Max. permitted ambient temperature
during operation °C +10 to +40
Max. permitted ambient temperature
during storage °C -10 to +60
Permitted gas inlet temperature °C +10 to +40
Max. surface temperature of the
pump (outer part) °C 110
Max. permitted atmospheric moisture
during operation
(no condensation)
%30 to 85
Degree of protection of the pump IEC 529
Pump
Pump + AK + EK / Pump + IK + EK
IP 54**
IP 52**
IP 54**
IP 54**
IP 54**
IP 54**
Nominal current draw A 1.2 2 2 x 2
Maximum start-up current /
Start-up duration
5.5 A /
125 ms
10.2 A /
125 ms
2 x 10.2 A /
125 ms
Max. permitted range of voltage sup-
ply / frequency 230V ± 10% / 50 Hz
Integral leak rate mbar*l/s 0.1
We reserve the right for technical modications without prior notice!
* Technical data according to EN 61010-1 and EN 1012-2 recommendation. The pump achieves its ultimate pumping speed and ultimate vacuum only at operating
temperature (after approx. 15 min.).
** Only when positioning the pump horizontal.

page 17 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
Type
MZ 2C EX
MZ 2C EX +
AK + EK
MZ 2C EX +
IK + EK
MD 4C EX
MD 4C EX +
AK + EK
MV 10C EX
MV 10C EX +
AK + EK
Motor power kW 0.15 0.25 2 x 0.25
No-load speed min-1 1500
A-weighted emission sound
pressure level***
(uncertainty KpA: 3 dB(A))
dB(A) 50 53 53
Inlet
Pump
Pump + IK + EK
KF 16
hose nozzle
DN 13 mm
KF 25
-
KF 25
-
Outlet
Pump
Pump + AK + EK / Pump + IK + EK
KF 16
hose nozzle 10 mm
Gas ballast connection hose nozzle 10 mm
Inert gas purge connection hose nozzle 8 mm
Recommended ow of inert gas l/min ≥ 1
Overall dimensions L x B x H,
approx.
Pump
Pump + AK + EK
Pump + IK + EK
mm
mm
340 x 290 x 250
357 x 308 x 470
357 x 308 x 470
440 x 265 x 305
600 x 365 x 420
-
560 x 430 x 410
on request
-
Mass, approx.
Pump
Pump + AK + EK
Pump + IK + EK
kg
kg
21.6
25.4
on request
29.3
37.4
-
63.2
on request
-
We reserve the right for technical modications without prior notice!
*** Measurement according to EN ISO 2151:2004 and EN ISO 3744:1995 at 230V/50Hz and ultimate vacuum with exhaust tube
at outlet.

page 18 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
Components Wetted parts
Inlet stainless steel*
Outlet
Pump
Pump + AK + EK
stainless steel**
PBT
Hoses PTFE, antistatic
Fittings ETFE / stainless steel*
Housing cover insert PTFE, carbon reinforced
Head cover ETFE, carbon reinforced
O-ring in head cover FPM
Diaphragm clamping disc ETFE, carbon reinforced
Valve FFKM or PTFE
Diaphragm PTFE
Overpressure safety relief device stainless steel***, PTFE, carbon reinforced,
FFKM
Separator cover plate PTFE, carbon reinforced
Catchpot, collecting ask,
vapour condenser borsilicate glass
* stainless steel 1.4404
** stainless steel 1.4541
*** stainless steel 1.4404 and 1.4310
Position Component
12 exhaust waste vapour condenser
13 coolant inlet
(hose nozzle 6 mm)
14 coolant outlet
(hose nozzle 6 mm)
15 catchpot
16 cover plate
17 collecting ask
18 immission condenser
Position Component
1 inlet (vacuum connection)
2 outlet (gas!)
3 on/off switch (0: off, 1: on)
4 rating plate
5 handle
6gas ballast connection
(only inert gas)
7 inlet inert gas purge
8 outlet inert gas purge
9 overpressure valve
10 antistatic connection
11 mains cable
Wetted parts
Pump parts
We reserve the right for technical modications without prior notice!

page 19 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
MZ 2C EX
1
6
4
2
5
7
8
9
3
10
11
MD 4C EX
1
6
4
2
5
7
8
9
3
10
11

page 20 of 75
Documents are only to be used and distributed completely and unchanged. It is strictly the users´ responsibility to check carefully
the validity of this document with respect to his product. manual-no.: 999128 / 29/04/2014
MV 10C EX
1
6
4
2
5
7
8
9
3
10
35
11
(2x !)
MZ 2C EX + AK + EK
16
2
12
13
14
15
1
5
8
7
Attention: Further designation of the pump components see gure MZ 2C EX