vacuubrand MZ 2C VARIO select User manual

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
Technology for Vacuum Systems
Instructions for use
MZ 2C VARIO
MD 4C VARIO
PC 2002 VARIO
PC 2003 VARIO
PC 2004 VARIO
Chemistry pumping units with speed control

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
Attention! Important notes!
Not permitted! Misuse may cause damage.
Caution! Hot surface!
Isolate equipment from mains.
Note.
Technische Beratung Gebiet Nord: Telefon: [phone]
Gebiet Mitte: Telefon: [phone]
Gebiet Süd: Telefon: [phone]
Kundendienst und Service: Telefon: [phone]
After sales service:Contact your local dealer or call (++49) 9342/808-193.

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
Contents
➨➨
➨➨
➨Safety information!
➨➨
➨➨
➨Technical data
➨➨
➨➨
➨Description
➨➨
➨➨
➨Use and operation
- Notes on operation
- Working with the controller
➨➨
➨➨
➨Accessories
➨➨
➨➨
➨Troubleshooting
➨➨
➨➨
➨Readjustment
➨➨
➨➨
➨Interface parameters
➨➨
➨➨
➨Replacing diaphragms and valves
➨➨
➨➨
➨Cleaning and assembling components
➨➨
➨➨
➨Notes on return to the factory
Repair - return - DKD calibration
➨➨
➨➨
➨Health and safety clearance form

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
Safety information!
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.
☞Read and obey this manual before installing or operating the equipment.
☞Transport the pump at the provided handles.
Use the equipment for the intended use only (for generation and measurement of
vacuum).
☞☞
☞☞
☞Prevent any part of the human body from coming in contact with the vacuum.
☞Obey notes on correct vacuum and electrical connections, see section ”Use and
operation”.
☞Make sure that the individual components are only connected, combined and op-
erated according to their design and as indicated in the instructions for use.
Obey national safety regulations and safety requirements concerning the use of
vacuum and electrical equipment.
☞The mains switch for the controller and the pump is at the rear side of the control-
ler.
☞After switching off the pump, wait 60 sec. minimum until next switching on.
☞Due to the high leakage current (> 3.5 mA), a too low rated frequency converter
safety switch may be activated, especially if several pumps are operated parallelly.
Attention: Make sure that a protective conductor connection is established be-
fore the equipment is connected to mains supply!
➨The pumping units MZ 2C VARIO, MD 4C VARIO, PC 2002 VARIO, PC 2003 VARIO
und PC 2004 VARIO are devices with double-pole cutoff and a symmetric capaci-
tive circuit.
☞If the leakage current is obtained by measuring the equivalent leakage current (ac-
cording to VDE 0701, September 2000, section 5.7), the measured value may be
devided by a factor of 2 in case the device is equipped with a double-pole cutoff and
a symmetric capacitive circuit.
☞The shock currents according to EN 61010 are below the limit of 3,5 mA.
☞Equipment must be connected only to a suitable fused and protected electrical
supply and a suitable earth point. Failure to connect the motor to ground may
result in deadly electrical shock.
☞The supply cable may be fitted with a moulded European IEC plug or a plug suit-
able for your local electrical supply. If the plug has been removed or has to be
removed, the cable will contain wires colour coded as follows: green or green and
yellow: earth; blue or white: neutral; brown or black: live.
☞Check that mains voltage and current conform with the equipment (see rating plate).
☞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).
☞Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated.
Obey all relevant safety requirements (regulations and guidelines) and adopt suitable
safety measures.

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
☞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 pipe-
line cannot become blocked). If you have an exhaust-isolation valve, make sure that
you cannot operate the equipment with the valve closed. Risk of bursting!
☞Ensure that the system design does not allow the exhaust pipeline to become
blocked.
☞Max. permitted pressure at the pressure transducer: 2 bar (absolute).
☞Ensure that the system design does not allow the coolant outlet pipeline to become
blocked.
☞Check the overpressure safety relief device at the exhaust waste vapour condenser
in appropriate intervals.
☞Avoid overpressure of more than 0.2 bar in case inert gas is connected.
☞The diameter of the inlet and outlet pipeline should be at the least as large as the
diameter of the pump connection pipelines.
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 conform-
ity”) with regard to design, type and model, especially directive IEC 1010. This direc-
tive 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 out-
doors, installation in altitudes of more than 1000 m above mean sea level, conduc-
tive pollution or dewiness.
Pay attention to symbol “hot surfaces“ on the equipment (according to IEC 1010 rec-
ommendation).
☞Adopt suitable measures to prevent any danger arising from the formation of hot
surfaces or electric sparks.
The pumps are not suitable to pump dangerous or explosive gases or explosive
or flammable mixtures. Ensure that the materials of the wetted parts are compatible
with the pumped substances, see section “Technical data”.
☞Adopt suitable measures to prevent the release of dangerous, explosive, corrosive
or polluting fluids.
☞Use inert gas for gas ballast or venting if necessary.
☞The user must take suitable precautions to prevent any formation of explosive
mixtures in the expansion chamber. In case of a diaphragm crack, mechanically
generated sparks, hot surfaces or static electricity may ignite these mixtures.
☞Take adequate precautions to protect people from the effects of dangerous sub-
stances (chemicals, thermal decomposition products of fluoroelastomers), wear
appropriate safety-clothing and safety glasses.
☞Obey applicable regulations when disposing of chemicals.Take into consideration
that chemicals may be polluted.
The motor is shut down by a thermal cutout in the winding.
☞Manual reset is necessary. Switch off the pump or isolate the equipment from mains.
Wait approx. five minutes before restarting the pump.
☞Provide a firm level platform for the equipment and check that the system to be
evacuated is mechanically stable and that all fittings are secure.
Attention: Flexible elements tend to shrink when evacuated.
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 mechani-
cal stability of the system.

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
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 contami-
nated.
The controller is equipped with a short circuit proof transformer with an integrated
overload protection (no fuses).
☞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 circum-
stances.
Electronic equipment is never 100% fail-safe. This may lead to an indefinite status of
the equipment. Provide protective measures against misfunction and failure.
☞Operating the pump with high or low frequency, 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 diaphragm cracks or leaks in the manifold 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.
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.
Ensure that maintenance is done only by suitably trained and supervised technicians.
Ensure that the maintenance technician is familiar with the safety procedures which
relate to the product processed by the vacuum system and that the equipment, if
necessary, is appropriately decontaminated before starting maintenance.
Obey local and national safety regulations.
Before starting maintenance vent the system, isolate the pump and other components
from the vacuum system and the electrical supply, drain condensate and allow suffi-
cient cooling of the pump.
Before starting maintenance, wait two minutes after isolating the equipment from mains
to allow the capacitors to discharge.
Never operate the pump if covers or other parts of the pump are disassembled.
Never operate a defective or damaged pump.
Repair of the gauge head VSK 5 is not possible.
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 cer-
tain procedures (see section “Notes on return to the factory“) are followed.
☞Avoid high heat supply (e. g. due to hot process gases).
☞Ensure sufficient air admittance if pump is installed in a housing.
Due to the residual leak rate of the equipment, there may 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.

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
Technical data
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/OIRAV
2002CP
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3002CP
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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
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.).
* Typical current draw draw in mode ”Continuous pumping” and frequency ”HI”.
We reserve the right for technical modification without prior notice!
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035x583x562
/532x042x543
035x583x562
035x583x562
.xorppassaMgk1.91/6.412.4
2/6.912.42
Technical data (ctd.)

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
* The actual pressure control range in your special application might be reduced due to ultimate vacuum of the pump, quantity of gas occurring etc.
* reg. trade mark Du Pont
We reserve the right for technical modification without prior notice!
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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
MZ 2C VARIO
MD 4C VARIO
inlet
gas ballast valve
rating plate
outlet
trip line and power supply of the
frequency converter
pressure transducer VSK 5
controller CVC 2000II
pump MZ 2C
with frequency converter
inlet
gas ballast valve
rating plate
outlet
trip line and power supply of
the frequency converter
pressure transducer VSK 5
controller CVC 2000II
pump MD 4C
with frequency converter

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
PC 2002 VARIO
PC 2003 VARIO / 2004 VARIO
exhaust waste
vapour condenser
with cover
overpressure safety
relief device at the
exhaust waste
vapour condenser
controller CVC 2000II
pump MZ 2C VARIO
with frequency converter
inlet (vacuum
connection)
pressure transducer VSK 5
round bottom flask to
collect condensate
exhaust waste
vapour condenser
with cover
overpressure safety
relief device at the
exhaust waste
vapour condenser
controller CVC 2000II
pump MD 4C VARIO or
MV 2C VARIO with
frequency converter
inlet (vacuum
connection)
pressure transducer VSK 5
round bottom flask to
collect condensate

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Description
General view display
The controller can be adapted to the specific application by choosing another mode
than ”Pressure control” (factory-set), see section ”General view modes”.
The status of the controller respectively of the connected accessories is displayed by
corresponding symbols on the LCD. After switching on the version of the software is
displayed, than the mode as well as the symbols “cooling water valve” and “air admit-
tance valve”, if the valves are preselected.
automatic mode
Pressure reading
selectable
pressure units
process control
active
warning (in combination with
other symbols)
setups cooling water valvepump symboltime
counter
air admittance valve
remote operation
setup pressure control
or continuous pumping
setup VACUU•LAN

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Keys
- pressure setting (only pressure control)
- adapting process pressure
- setting of frequency
- setting time for switch-off (only VACUU•LAN)
- switching (toggling) in setups
start or stop of process control or
confirmation of selected values or mode
operating air admittance valve
(only if valve is connected and
preselected)
MODE START
STOP VENT
CVC
2000II
p
Rear side CVC 2000II
- switch on/off automatic mode (only pressure control)
- special function (in combination with another key)
connection power
supply frequency
converter
mains switch
connection mains
cable
female connector to connect
trip line frequency converter
female connector to connect a cooling
water valve and/or an air admittance valve
serial interface
RS 232 C
female connector to connect
the gauge head VSK 5
thread M8 for stand rod
(included)

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Notes on operation
Installing in a vacuum system:
☞Avoid throttling losses by using connecting pipes with large diameter and keep
them as short as possible.
☞Reduce the transmission of vibration and prevent loading due to rigid pipelines.
Insert elastic hoses or flexible elements as couplings between the pump and rigid
pipes. Attention: Flexible elements tend to shrink when evacuated.
☞Use a suitable valve to isolate the pump from the vacuum system to allow the
pump to warm up before condensable vapours are pumped or to clean the pump
before it is switched off.
☞Connect the exhaust to a suitable treatment plant to prevent the discharge of dan-
gerous gases and vapours to the surrounding atmosphere. Use a catchpot to pre-
vent the drainage of contaminated condensate back into the pump.
Prior to use:
☞Max. ambient temperature: 40 °C
☞Make sure ventilation is adequate if pump is installed in a housing or if ambient
temperature is elevated. Keep a distance of min. 20 cm between fans and ambient
parts.
☞If pump is installed in altitudes of more than 1000 m above mean sea level check
compatibility with applicable safety requirements, e. g. DIN VDE 0530 (motor may
overheat due to insufficient cooling).
☞When assembling, ensure vacuum-tightness. After assembly, check the com-
plete system for leaks.
During operation:
Do not start pump if pressure difference between inlet and outlet port exceeds max.
1 bar. Attempts to start pump at higher difference may cause blockade and damage of
the motor.
☞Check compatibility with max. permitted pressure at outlet and max. pressure
difference between inlet and outlet ports.
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 me-
chanical stability of the system.
The pump achieves its pumping speed, ultimate total vacuum and vapour pumping
rate only at operating temperature (after approx. 15 minutes).
☞Prevent internal condensation, transfer of liquids or dust.The diaphragm and valves
will be damaged, if liquids are pumped in significant amounts.
☞Let the pump run with gas ballast to reduce condensation of pumped substances
(water vapour, solvents, ....) in the pump.
Motor is shut down by a thermal cutout in the winding.
☞Manual reset is necessary. Switch off the pump or isolate the equipment from
mains.Wait approx. five minutes before restarting the pump. Determinate cause of
failure and eliminate.
How to change the pressure units
+
mbar
Torr
hPa
(mains switch)
Press key p▲ or p▼during switching on.
☞The pressure units are displayed, the pressure unit as from
last operation is flashing.
➨Press key ▲ or ▼to change pressure unit. Press key stop
when controller displays the desired pressure unit to finish
the operation mode.
p

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The exhaust waste vapour condenser enables an efficient con-
densation of the pumped vapours at the outlet.
☞Next to 100% solvent recovery.
☞The cover protects against glass splinters in the event of
breaking, acts as thermal isolation to avoid the condensa-
tion of humidity and is intended to absorb shocks.
☞Install hoses for cooling water at the inlet and outlet (hose
nozzle 6 mm), check hose connection.
➨Ensure that the system design does not allow the coolant
outlet pipeline to become blocked.
☞Ensure that the system design does not allow the exhaust
pipeline to be blocked (hose nozzle 10 mm), do not permit
uncontrolled pressurizing.
☞Connect the exhaust to a suitable treatment plant to pre-
vent the discharge of dangerous gases and vapours to the
surrounding atmosphere.
Before operation MZ 2C VARIO / MD 4C VARIO:
Connect cable from the frequency converter of the pump to the controller (rear side): trip line and power
supply of the frequency converter.
coolant outlet
(hose nozzle 6 mm)
coolant inlet
(hose nozzle 6 mm)
outlet
(gas!; hose nozzle 10 mm)
Connect the cable of the gauge head to the female connector
at the rear side of the vacuum controller.
Connect the gauge head to the vacuum system by using a
small flange connection or a hose connection.
☞The device is adjusted together with the gauge head at the
factory. If the gauge head is replaced a readjustment is rec-
ommended.
➨Connect cable from the frequency converter of the pump to
the controller (rear side): trip line and power supply of the
frequency converter.
female connector
to connect gauge
head
VSK 5
Max. permitted pressure at the pressure transducer: 2 bar (ab-
solute).
☞The display flashes at a pressure higher than 1100 mbar.
☞Obey max. permitted pressure.
☞Inside a vacuum system where evaporation occurs, e. g.
rotary evaporator, the vacuum is not uniform, e. g. a con-
denser acts as pump or the vacuum in the pipeline is lower
than in the system. Therefore carefully choose position
where to connect the gauge head.
☞Condensate and deposits in the pressure transducer affect the measuring result.
☞In case of deposits, aggressive or condensable media, install a gas washing bottle before the pressure
transducer if necessary.
☞In order to avoid malfunction it is important to position the pressure transducer in the vacuum line so as
to avoid flow of condensate towards the pressure transducer.
☞Clean pressure transducer if necessary, see section “maintenance“.
☞Preselections at the controller, see section “Modes“.
☞Use and operation of the controller see section “How to operate the controller”.
☞Setting of interface parameters, see section “Interface“.
gauge
head
VSK 5
Before operation PC 2002 VARIO / PC 2003 VARIO / PC 2004 VARIO:

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
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For condensable vapours (water vapour, solvents, ...):
☞Do not pump vapour before pump has reached its operat-
ing temperature and with gas ballast valve closed.
☞Open gas ballast valve. Close gas ballast valve by turning
180°.
☞The gas ballast valve is open if the flash on the gas ballast
cap shows away from the pump (MZ 2C VARIO / MD 4C
VARIO / PC 2002 VARIO), respectively downwards (PC 2003
VARIO / PC 2004 VARIO).
☞With gas ballast valve open ultimate vacuum will be reduced,
pumping speed is decreased.
☞Use inert gas at the air inlet to avoid the formation of explo-
sive mixtures.
In case of low boiling solvents when the formation of conden-
sate is unlikely, the use of gas ballast might be unnecessary.
☞Operating the pump without gas ballast increases the sol-
vent recovery rates at the exhaust waste vapour condenser.
gas
ballast
Separation of condensate:
Both round bottom flasks are coated with a protective layer to
prevent disintegration in case of breakage or implosion.
☞Collecting flask at the outlet: Remove joint clip, remove flask
and drain condensate.
☞Separator at the inlet: Isolate or shut down the pump, admit
air or inert gas to atmospheric pressure. Remove joint clip,
remove flask and drain condensate.
Important: Obey applicable regulations when disposing sol-
vents. Reuse if possible, purify if contaminated.
Check overpressure safety relief device at the exhaust waste
vapour condenser regularly, replace if necessary.
☞Check especially for conglutination and cracks.
During operation PC 2002 VARIO / PC 2003 VARIO / PC 2004 VARIO:
overpressure
safety relief
device
catchpot at
the outlet
catchpot at
the inlet
Attention: Important notes regarding the use of gas ballast
☞Make sure that air/gas inlet through the gas ballast valve never leads to hazard-
ous, explosive or otherwise dangerous mixtures. If in doubt, use inert gas.
☞When using air rather than inert gas, risk of significant damage to equipment and/
or facilities, risk of personal injury or even loss of life exists due to the formation of
hazardous and/or explosive mixtures if air and pumped media react inside or at the
outlet of the pump.

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
Shutdown:
Short-term:
Has the pump been exposed to condensate?
☞Allow the pump to continue to run at atmospheric pressure for a few minutes (con-
tinuous pumping at a frequency of 60 Hz).
Has the pump been exposed to media which may damage the pump materials or
forms deposits?
☞Check and clean pump heads if necessary.
Has the pressure transducer been exposed to media which may form deposits?
☞Clean pressure transducer if necessary.
Long-term:
➨Take measures as described in section short-term shutdown.
➨Separate pump from the apparatus.
➨Close inlet and outlet port (e. g. with transport caps).
➨Store the pump in dry conditions.

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
CVC 2000II
setting pressure unit (mbar / Torr / hPa)
configuration of the cooling water valve if applicable
setting mode
ready to
start
mode ”pressure control” (factory set)
controller controls
- pump according to preset pressure value or in automatic mode
- cooling water valve (optional)
- air admittance valve (optional)
mode ”VACUU•LAN”
controller controls
- pump according to preset pressure and time values
- cooling water valve (optional)
- air admittance valve (optional)
General view modes
mode ”continuous pumping”
controller controls
- pump according to preset pumping speed
- cooling water valve (optional)
- air admittance valve (optional)
configuration of the air admittance valve if applicable

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49 pages. The instructions for use describe only the actual product. If the product is older or newer than the date of writing, it is strictly the users´ responsibility to check carefully
the validity of the document (if in doubt, order appropriate instructions for use). 99 90 34 / 12/09/2003
The controller CVC 2000II can be adapted to the specific application by choosing the
appropriate mode, pressure control with or without automatic, continuous pump-
ing with preset pumping speed or VACUU•LAN: The components of the chemistry
vacuum system (cooling water valve, air admittance valve) have to be preset once
only. The mode as from last operation and the preselected values (e. g. for pressure,
speed or time for switching off) are stored. In case of similar operation conditions it is
possible to start immediately, if the preselections are chosen appropriately.
Working with the controller
How to configurate the controller
Pressure control:
☞Position control on preset pressure value.
☞The pumping speed is adapted to the occurring gas/vapour,
so that the preset pressure value is kept constantly.
☞Operating in equilibrium by continuous adaption of the con-
troller, no abrupt switching of valves.
☞Vacuum supply according to the requirements for lock cham-
bers or pumping systems not compressing against atmos-
pheric pressure, e. g. wide range turbomolecular pumps or
cryo pumps.
Continuous pumping with preset pumping speed:
☞Simple suction, suck liquids by siphon, drying, sucking off
excess, etc.
☞Suction with regulated pumping speed.
☞Pumping down until the ultimate vacuum of the pump is
achieved (e. g. to dry a system).
☞System controlled by an interface: temporally variable pump-
ing speed to optimize the process conditions (e. g. to dry
sensitive substances).
☞Pumping with pressure selection ”HI”: Optimum pumping
speed at any pressure.
Pressure control in automatic mode:
☞Searching the boiling point and adjusting the set point auto-
matically if the boiling point changes (due to temperature
change, change of ingredients of solutions).
☞Adjusting the set point automatically after manual setting of
the boiling point (additional automatic mode in operation
mode pressure control).
☞Automatic switching off after complete evaporation of the
solvent if preselected.
In all modes:
☞If cooling water and/or air admittance valve have been con-
nected and preselected:
☞Process-adapted operation of the cooling water valve.
☞Key-driven venting or adjustment of the set point by venting
if process control is active.
The vacuum controller CVC 2000II offers three modes depending on
- the components of the VACUUBRAND chemistry vacuum system which are con-
nected to the system.
- the specific user and/or process requirements.

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VACUU•LAN:
☞Operation of the pump depending on actual pressure de-
mand.
☞The cooling water is switched off if no more pumping is re-
quired, switched on again if gas or vapour occur.
☞The mode for decentralized vacuum network systems (for
vacuum in laboratories, vacuum lines for weekend, night or
trainee operations). Continuous vacuum without continuous
pumping.
☞Additional extension of the lifetime of diaphragms and valves
(only as many diaphragm strokes as necessary).
Setting the mode
Starting the program:
➨Press key MODE while switching on the controller.
☞The mode “pressure control” (factory-set) is displayed on
the LCD by flashing symbols.
To change the mode:
➨Press key ▲or ▼ until the symbol of the desired mode is
flashing.
Only in mode pressure control:
☞“Set“, “Auto“ and ”yes” or ”no” are displayed.
➨Switching between ”yes” or ”no” is possible by pressing key
▲or ▼.
➨To preselect the automatic mode confirm ”yes” by pressing
key START/STOP.
➨If you do not wish to preselect the automatic mode confirm
”no” by pressing key START/STOP.
pressure control continuous pumping VACUU•LAN
☞The symbol of the air admittance valve is displayed and
”yes” or ”no”.
➨Switching between ”yes” or ”no” is possible by pressing key
▲or ▼.
➨Confirm the selection ”yes” or ”no” by pressing key START/
STOP.
After selecting the mode:
☞The symbol of the cooling water valve is displayed and
”yes” or ”no”.
➨Switching between ”yes” or ”no” is possible by pressing key
▲or ▼.
➨Confirm the selection ”yes” or ”no” by pressing key START/
STOP.
MODE +
(mains switch)
➨Press key START/STOP to confirm the selected mode.