KNF SC 920G User manual

KNF 121308-121311 07/18
Translation of original Operating Instructions, english
Operating Instructions
Read and observe this Operating Instructions!
Vacuum pump system
with wireless remote control
SC 920G
KNF Neuberger GmbH
Alter Weg 3
D-79112 Freiburg
Germany
Phone ++49 / (0)7664 / 5909-0
Fax ++49 / (0)7664 / 5909-99
E-Mail: inf[email protected]
www.knf.de

Translation of original Operating Instructions, english, KNF 121308-121311 07/18
Items including delivery:
Vacuum pump system including hand terminal (batteries
included)
Coated collection flasks (2 x)
Flask clamps (2 x)
Mains cable
USB cable for connecting vacuum pump system to PC
Power supply for hand terminal
Operating Instructions
Abbreviated instructions
CD with digital Operating Instructions and software for
operating the vacuum pump system with a PC
Allen key for transport fastener
Transport fastener
The hand terminal is fastened in place at the factory, to prevent
damage during transport.
To remove the hand terminal, it is first necessary to release the
transport fastener. For further details, see chapter
6
.Installation and connection.

Vacuum Pump System SC 920G Content
Translation of original Operating Instructions, english, KNF 121308-121311 07/18
Content Page
1. About this document 4
1.1. Using the Operating Instructions 4
1.2. Symbols and Markings 4
2. Use 5
2.1. Proper Use 5
2.2. Improper Use 5
3. Safety 6
4. Technical Data 8
4.1. Vacuum pump system 8
4.2. Vacuum pump system’s hand
terminal 10
4.3. Software 10
5. Design and Function 11
5.1. Vacuum pump system overwiew11
5.2. Vacuum pump system functions 13
5.3. Hand terminal 15
5.4. Pump 16
5.5. Gas ballast 16
6. Installation and connection 17
6.1. Installation 17
6.2. Connection 18
7. Operation 19
7.1. Start up 19
7.2. Taking system out of operation 22
8. Operating vacuum pump system 23
8.1. Hand terminal 23
8.1.1.General functions and displays 23
8.1.2.Operation 25
8.1.3.Changing batteries on the hand
terminal 31
8.2. Operation without hand terminal 32
8.3. Software 32
9. Servicing 33
9.1. Servicing Schedule 33
9.2. Cleaning 33
9.2.1.Flushing Vacuum pump system 33
9.2.2.Cleaning Vacuum pump system33
9.2.3.Emptying collection flask on the
suction and pressure sides 33
9.3. Changing Diaphragms and Valve
Plates 35
9.4. Replace overpressure valve on
high performance condenser 39
10. Troubleshooting 40
11. Ordering Information 45
12. Returns 47
13. Health and safety clearance and
decontamination form 48

About this document Vacuum Pump System SC 920G
4 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
1. About this document
1.1. Using the Operating Instructions
The Operating Instructions are part of the vacuum pump system.
Carefully study the Operating Instructions before using a
vacuum pump system.
Always keep the Operating Instructions handy in the work area.
Pass on the Operating Instructions to the next owner.
Customer-specific project systems (systems which begin with “PJ”
or “PM”) may differ from the Operating Instructions.
For project systems, also observe the agreed upon
specifications.
Compliance with the Operating Instructions is essential for the
safe and reliab
le operation of the vacuum pump system.
Failure to do so may result in damage or injury.
1.2. Symbols and Markings
Warning
WARNING
A danger warning is located here.
Possible consequences of a failure to observe the
warning are specified here.
The signal word, e.g.
Warning, indicates the danger level.

Measures for avoiding the danger and its
consequences are specified here.
Danger levels
Signal word
Meaning
Consequences if not observed
DANGER
warns of
immediate danger
Death or serious injuries
and/or serious damage are the
consequence.
WARNING
warns of possible
danger
Death or serious injuries
and/or serious damage are
possible.
CAUTION
warns of a possibly
dangerous
situation
Minor injuries or damage are
possible.
Tab. 1
Other information and symbols
An activity to be carried out (a step) is specified here.
1. The first step of an activity to be carried out is specified here.
Additional, consecutively numbered steps follow.
This symbol refers to important information.
Project systems

Vacuum Pump System SC 920G Use
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 5
2. Use
2.1. Proper Use
The SC 920G vacuum pump system is designed for use in
chemical, pharmaceutical, and biological laboratories. The vacuum
pump system is exclusively intended for transferring gases and
vapors.
Make sure that the installation location is dry and the pump/system
is protected against rain, splash, hose and drip water.
Vacuum pump system is solely for use in indoor areas.
Owner's responsibility
Only install and operate the vacuum pump system under the
operating parameters and conditions described in chapter 4,
Technical data.
Protect vacuum pump system against humidity.
Before using a medium, check the compatibility of the materials of
the pump head, diaphragm, valves, sealings and tubing with the
medium.
Before using a medium, check whether the medium can be trans-
ferred danger-free in the specific application case.
Only transfer gases which remain stable under the pressures and
temperatures occurring in the pump.
The high performance condenser must be installed on the outlet
side of the pump; if it is installed on the inlet side there is a danger
of implosion.
Observe the correct usage of the gas- and cooling liquid-
connections on the high performance condenser. Inlet and outlet
connections for the gas are not interchangeable.
Laboratory equipment or additional components connected to a
vacuum pump system have to be suitable for use with the pneu-
matic capabilities of the vacuum pump system (see chapter 4,
page 8).
2.2. Improper Use
The vacuum pump system may not be operated in an explosive
atmosphere.
The vacuum pump system is not suitable for transferring dusts.
The vacuum pump system is not suitable for transferring liquids.
The vacuum pump system must not be used if the entry of air or
gas into the vacuum pump system during venting (vent valve)
could result in the creation of reactive, explosive or otherwise
hazardous mixtures (e.g. with the medium).
The vacuum pump system must not be used to create vacuum and
overpressure simultaneously.
An overpressure must not be applied to the suction side of the
vacuum pump system.
Operating parameters and
conditions
Requirements for
transferred medium
High performance condenser
Accessories

Safety Vacuum Pump System SC 920G
6 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
3. Safety
The vacuum pump system is built according to the generally recog-
nized rules of technology and in accordance with the occupational
safety and accident prevention regulations. Nevertheless, dangers
can result during their use which lead to injuries to the user or
others, or to damage to the vacuum pump system or other property.
Only use the vacuum pump system when it is in a good technical
and proper working order, in accordance with its intended use,
observing the safety advice within the operating instructions, at all
times.
Make sure that only trained and instructed personnel or specially
trained personnel work on the vacuum pump system. This
especially applies to assembly, connection and servicing work.
Make sure that the personnel has read and understood the opera-
ting instructions, and in particular the "Safety" chapter.
Observe the accident prevention and safety regulations when per-
forming any work on the vacuum pump system and during opera-
tion.
Do not expose any part of your body to the vacuum.
Open housing parts with notice sticker (see fig. 1) only after sepa-
rating mains plug from power source.
Ensure that the employees check that the hand terminal is the right
one for this particular system before using a SC 920G vacuum
pump system. Vacuum pump systems are equipped with a paging
system for this purpose (see Actuating the vacuum pump system,
page 29).
When transferring dangerous media, observe the safety regula-
tions when handling these media.
Be aware that the vacuum pump system is not designed to be
explosion-proof.
Make sure the temperature of the medium is always sufficiently
below the ignition temperature of the medium, to avoid ignition or
explosion. This also applies for unusual operational situations.
Note that the temperature of the medium increases when the pump
compresses the medium.
Hence, make sure the temperature of the medium is sufficiently
below the ignition temperature of the medium, even when it is
compressed to the maximum permissible operating pressure of the
vacuum pump system. The maximum permissible operating pres-
sure of the vacuum pump system is stated in the technical speci-
fications (see chapter 4, page 8).
If necessary, consider any external sources of energy, such as
radiation, that may add heat to the medium.
In case of doubt, consult the KNF customer service.
Personnel
Working in a safety-
conscious manner
Fig. 1: Notice sticker
Correct match between hand
terminal and vacuum pump
system
Handling dangerous media
Handling flammable media

Vacuum Pump System SC 920G Safety
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 7
When ventilating the vacuum pump system with air or inert gas, be
sure to prevent formation of reactive or explosive media. The
maximum permissible operating pressure at the ventilation
connection (Fig 2/5, page 11) is 0.1 bar g.
Store all replacement parts in a protected manner and dispose of
them properly in accordance with the applicable environmental
protection regulations. Observe the respective national and inter-
national regulations. This especially applies to parts contaminated
with toxic substances.
The vacuum pump system SC 920G conforms to the Directive
2011/65/EU (RoHS2).
The vacuum pump system SC 920G conforms to the safety
regulations of the EC Directive 2014/30/EU concerning
Electromagnetic Compatibility and the EC Directive 2006/42/EC
concerning Machinery. The requirements of the following
harmonised standards are fulfilled:
DIN EN 61010-1
DIN EN 61326-1 – class A
DIN EN 50581
The pumps correspond to DIN EN 60664-1:
the overvoltage category II
the pollution degree 2
Only have repairs to the vacuum pump system carried out by the
KNF Customer Service responsible.
Only authorized personnel should open those parts of the housing
that contain live electrical parts.
Use only genuine parts from KNF for servicing work.
Ventilating the vacuum pump
system
Environmental protection
Standards
Customer service and
repairs

Technical Data Vacuum Pump System SC 920G
8 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
4. Technical Data
4.1. Vacuum pump system
Materials for parts contacting the medium
Pump head
PPS
Diaphragms
PTFE-coated
Valves
FFPM
Sealings
FPM
Hose connectors
PVDF
Tubing
Norprene®
Pressure sensor
Ceramics
Venting valve
FFPM
Valve block
PP
Gas ballast valve
PVDF
Pneumatic performance
Max. permissible operating
pressure [bar g]
0
Ultimate vacuum [mbar abs.]
≤ 2
≤ 5 with open gas ballast
Delivery rate at atm. pressure
[l/min]*
0-21 (controllable)
Max. permissible pressure at
inert gas connection [bar g]
0.1
Ambient and media temperature
Permissible
ambient temperature
+ 10 °C to + 40 °C
Permissible media temperature
+ 10 °C to + 40 °C
Other parameters
Vacuum connection and gas
outlet
For tube ID 10 mm
Ventilation connection
For tube ID 6 mm
Weight of vacuum pump
system, including hand
terminal [kg]
15.2
Dimensions:
width x height x length [mm]
366 x 423 x 294
Maximum permissible ambient
relative humidity
80 % for temperatures up to
31°C, decreasing linearly to
50 % at 40°C
Maximum altitude of site
[m above sea level]
2000
Tab. 2 (part 1) *Liters in standard state (1,013 mbar at 0 °C)

Vacuum Pump System SC 920G Technical Data
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 9
Operating parameters of coolant (high performance condenser)
Max. permissible pressure
[bar g]
3
Permissible temperature
- 15 °C to + 20 °C
Coolant connections on high-
peformance condenser
For tube ID 8 mm
Coolant-wetted surface [cm2]
Min. 460
Electrical data vacuum pump system
Voltage** [V]
100-240 +/- 10 %
Frequency [Hz]
50/60
Max. current consumption at
100 V / 115 V / 240 V [A]
1.7 / 1.5 / 0.8
Max. watt consumption [W]
135
Protection class
IP20
Fuse vacuum pump system [A]
2 x T2.5
Drive motor fusing
Electronic overcurrent protection
Tab. 2 (part 2) ** Automatic voltage selection

Technical Data Vacuum Pump System SC 920G
10 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
4.2. Vacuum pump system’s hand terminal
Dimensions:
width x height x length [mm]
90 x 205 x 55
Weight [kg]
0.51
Operating voltage
24 V DC
Current consumption
1 A
Wireless connection's
frequency band
2.4 GHz
Wireless range
About 50 m without obstacles,
about 10 m through walls
Power supply
Through integrated batteries or
power supply (in delivery
included)
DC charging socket
External diameter: 6.3 mm
Inside diameter: 2 mm
Chargeable batteries
4 x round AA 1.2 V max. 2600
mAh, rechargeable; see spare
parts list in chapter 11
Battery service life*
Up to 12 hours, depending on
number of entries and data
transmission
Charging time*
about 7 h
Tab. 3 * Applies to standard included batteries
When charging the hand terminals of the SC 920G vacuum
pump system, use only the original power supply from KNF.
Several different vacuum pump systems may be operated
simultaneously with their respective hand terminals within th
e
wireless connection range.
The wireless connection between hand terminal and vacuum
pump system is robustly resistant to operation of mobile
telephones and Bluetooth devices in the immediate area.
4.3. Software
The USB connection between the PC and the vacuum pump
system is operated as an RS232 interface. Accordingly, in the
operating system it is managed as an additional COM connection
and can be addressed with conventional terminal software. Please
see the delivered CD for information on operating the vacuum
pump system via software.

Vacuum Pump System SC 920G Design and Function
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 11
5. Design and Function
5.1. Vacuum pump system overwiew
1Carrying handle
2
Hand terminal (removable;
signals transmitted
wirelessly)
3
Set screw of transport
fastener
4
High-performance
condenser
5
Gas ballast switch
6
Ventilation connection
7
Vacuum chamber
connection (gas inlet)
8
Hexagonal gland
9
Pump
10
Base
1
1Flask clamp for 12
1
2Suction-side condensation
collection flask (coated)
13
Mains switch
14
Hand terminal dock
15
Pressure-side condensa-
tion collection flask (coated)
16
Flask clamp for 15
1
7Gas outlet
18
Pin of transport fastener
1
9Coolant connection on
high-performance
condenser (feed)
20
Coolant connection on
high-performance
condenser (return)
Fig. 2: Vacuum pump system SC 920G

Design and Function Vacuum Pump System SC 920G
12 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
1USB port for connecting
vacuum pump system to
PC
2
Coolant valve connection
3
Mains plug connection
4
Fuse drawer
Fig. 3: Plug strip on rear of base (Fig. 2/10)
The vacuum pump system generates a vacuum that can be con-
trolled either through the hand terminal (see chapter 5.3, page 15)
or a PC.
Collection flask (Fig. 2/12) collects on the suction side of the pump
particles and drops that were, contrary to the requirements of the
pump, suctioned from the vacuum chamber. The collection flask is
coated (implosion protection) and fastened to the vacuum pump
system via a flask clip.
The high-performance condenser at the pump outlet once again
recollects solvents from the pumped gas instead of allowing it exit
into the environment or fume hood. The high-performance con-
denser is surrounded by a shell for temperature insulation and
explosion protection.
Solvents deposited in the high-performance condenser are col-
lected in the coated (for explosion protection) collection flask (Fig.
2/15). A flask clip secures the glass flask to the condenser flange.
A recirculating cooler or continuously flowing cold water cools the
high-performance condenser to the condensation temperature.

Vacuum Pump System SC 920G Design and Function
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 13
5.2. Vacuum pump system functions
The vacuum pump system can be operated in four different modes:
Evacuate
The vacuum pump system evacuates a vacuum chamber with
adjustable pump capacity.
Pressure control
The vacuum pump system controls system pressure to the set-
point pressure value (constant pressure).
Automatic
The vacuum pump system independently finds the sample's
vapor pressure and adjusts process pressure accordingly.
Function
The vacuum pump system controls pressure according to the
entered pressure curve. Up to 10 different pressure curves can
be stored. The following process parameters can be entered:
−Setpoint pressure at various time points after starting the
process
−Coolant valve (accessory) ON and OFF with time point
after start of process
−Option "Jump" with time after the start of the process:
The system evacuates/ventilates to the required pressure
as quickly as possible.
−Option "Automatic" with time after the start of the process:
Automatic detection of the boiling pressure
If the set limit pressure is reached without a vapor
pressure, the program goes to the next function step.
−Option "Automatic Plus" with time after the start of the
process:
Automatic detection of the vapor pressure with subsequent
pressure reduction.
At any time during an active process, you can switch to manual
process control. Functions for Evacuate and Pressure control will
be available simultaneously. When activating manual process con-
trol, the current actual pressure will be adopted as the first setpoint
pressure. In other words, process pressure will be initially "frozen"
at the current value.
The operating modes can be combined in any way for the pur-
poses of intelligent process control. For example, after successful
boiling point detection in the automatic mode, the following opera-
ting modes are available for specific distilling off of the solvent
recovered:
Evacuation
(constant vaporization rate for optimum condenser capacity
utilization)
Function
(Following a preset pressure ramp provided in order to attain a
separation from components with higher boiling points)

Design and Function Vacuum Pump System SC 920G
14 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
Manual process control
(active control of the distillation using the setpoint pressure)
In order to change to another operating mode, the process is first
stopped and then restarted in the new operating mode.
The gas ballast switch (Fig. 2/5) can be used to open and close the
gas ballast valve on the vacuum pump system's pump (see
Chapter 5.5).
Gas ballast

Vacuum Pump System SC 920G Design and Function
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 15
5.3. Hand terminal
Basic elements
1 Upper grip
2
Touchscreen
3
I/O switch
4
DC input 24 V
5
Rotary/push knob for
adjusting pump speed
and setpoint pressure
switching to manual
operation
Fig. 4: Hand terminal
Function
The hand terminal is used to set process parameters with which
the vacuum pump system will control pressure.
Settings can be made on the hand terminal's touchscreen (2) and
with the rotary/push knob (5).
To operate the vacuum pump system remotely, remove the hand
terminal from the holder (see chapter 8.1.1, page 23) on the
vacuum pump system. This provides a convenient way to operate
the vacuum pump system when it is in a cabinet or under a closed
fume hood.
Whenever the hand terminal is located in the holder while the
vacuum pump system is turned on, the batteries in the hand
terminal will charge automatically. This happens even when hand
terminal is switched off. Alternatively, the batteries can be charged
through the hand terminal's power supply (see DC input (4)). As a
result, it is not necessary to place the vacuum pump system where
it is easily accessible for the user.
The power supply also makes it possible to supply the hand termi-
nal with electrical power directly from a mains connection.
An acoustic alarm sounds on the hand terminal when the battery
charge levels are low.

Design and Function Vacuum Pump System SC 920G
16 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
5.4. Pump
Design
1Outlet valve
2
Inlet valve
3
Transfer chamber
4
Diaphragm
5
Eccentric
6
Connecting rod
7
Pump drive
Fig. 5: Pump design
Function Diaphragm pump
Diaphragm pumps transfer, compress (depending on pump
version) and evacuate gases and vapors.
The elastic diaphragm (4) is moved up and down by the eccentric
(5) and the connecting rod (6). In the downward stroke it aspirates
the gas to be transferred via the inlet valve (2). In the upward
stroke, the diaphragm presses the medium out of the pump head
via the outlet valve (1). The transfer chamber (3) is hermetically
separated from the pump drive (7) by the diaphragm.
5.5. Gas ballast
WARNING
Personal injury caused by poisoning or explosion
and damage to the pump

Make sure that no reactive or explosive mixtures
will be produced when the gas ballast valve is
open.
When transferring vaporous media, opening the gas ballast
valve can minimize the formation of condensation in the pump
heads.
Opening the gas ballast valve deteriorates ultimate vacuum
performance.
The gas ballast valve is opened and closed via the gas ballast
switch (see Fig. 6).
Please contact KNF Service if you require an inert connection for
the gas ballast.
Fig. 6: Gas ballast switch

Vacuum Pump System SC 920G Installation and connection
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 17
6. Installation and connection
Only install the vacuum pump system under the operating
parameters and conditions described in chapter 4, Technical
data, page 8).
Observe the safety precautions (see chapter 3, page 6).
6.1. Installation
Before installation, store the vacuum pump system at the
installation location to bring it up to room temperature.
Install the vacuum pump system so that the motor fan of the
pump can intake sufficient cooling air.
Make sure that the installation location is dry and the vacuum
pump system is protected against rain, splash, hose and drip
water.
Choose a safe location (flat surface) for the vacuum pump
system.
Protect the vacuum pump system from dust.
Protect the vacuum pump system from vibrations and jolts.
Only connect components to the vacuum pump system which
are designed for the pneumatic data of the vacuum pump sys-
tem (see chapter 4, page 8).
A recirculating cooler or flowing cold water (or another cooling
medium) is needed to cool the high-performance condenser to the
condensation temperature.
The hand terminal is fastened in place at the factory, to prevent
damage during transport. To remove the hand terminal, it is
first necessary to release the transport fastener.
1. Loosen the set screw (Fig. 2/3, p. 11).
2. Pull out the pin of the transport fastener (Fig. 2/18, p. 11) as far
as the limit stop.
3. Tighten the set screw again.
The transport fastener can be reattached for any future
transport operations.
Cooling air supply
Installation location
Connected components
Coolant for high-performance
condenser
Removing the transport
fastener

Installation and connection Vacuum Pump System SC 920G
18 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
6.2. Connection
1. Connect the vacuum chamber to the gas inlet's hose connec-
tor (Fig. 2/7, page 11, for hose inside diameter of 10 mm). For
this, vacuum tubing must be used.
2. Connect hose to high-performance condenser in order to
discharge gas exhaust (Fig. 2/17, page 11).
CAUTION
Danger of high performance condenser bursting.
The high
-performance condenser is not pressure-
proof.

Do not reduce or regulate the quantity of gas at
the gas outlet, and do not install any compo-
nents that hinder the gas flow.
Safely discharge gas exhaust so that no gas can escape into
the ambient air.
Make sure that the high-performance condenser’s gas outlet is
not blocked (high
-performance condenser is not pressure-
proof).
3. Attach coolant feed and return to high-performance condenser
(Fig. 2/19 and 20, page 11).
Connect only the KNF coolant valve (see Chapter 11.2,
Acce
ssories) to the coolant valve connection (Fig. 3/2, page
12
). Consult with KNF before using any other valves.
4. If necessary: Connect inert gas supply to ventilation connec-
tion (Fig. 2/6, page 11). Observe the safety instructions in
chapter 3.
5. Insert the power cable plug into a properly installed shockproof
socket.

Vacuum Pump System SC 920G Operation
Translation of original Operating Instructions, English, KNF 121308-121311 07/18 19
7. Operation
7.1. Start up
Before switching on the vacuum pump system, observe the
following points:
Operational requirements

All hoses attached properly
Fan openings not blocked
Specifications of the power supply correspond with the data
on the vacuum pump system’s type plate.
Recirculating cooler or cold water connection ready on high-
performance condenser.
The high-performance condenser's gas outlet is not blocked
(high-performance condenser is not pressure-proof).
Vacuum pump system is at room temperature.
Vacuum pump system and hand terminal belong together.
No reactive, explosive or otherwise hazardous mixtures may
be produced when ventilating the vacuum system through the
air inlet (Fig. 2/6, page 11) (if necessary, use an inert gas)
When the gas ballast valve is open, no reactive, explosive, or
otherwise hazardous mixtures can form (otherwise, contact
KNF Service).
Tab. 4
Only operate the vacuum pump system under the operating
parameters and conditions described in chapter 4, Technical
data (page 8).
Make sure the vacuum pump system is used properly (see
chapter 2.1, page 5).
Make sure the vacuum pump system is not used improperly
(see chapter 2.2, page 5).
Observe the safety precautions (see chapter 3, page 6).

Operation Vacuum Pump System SC 920G
20 Translation of original Operating Instructions, English, KNF 121308-121311 07/18
DANGER
Uncontrolled operation may result in personal injury
and damage to the vacuum pump system.
When using several vacuum pump systems, there is
the danger of confu
sing them, which can result in
undesired interference into other processes:
The
transmission of commands from the wrong hand
terminal for the vacuum pump system may trigger an
uncontrolled response in the vacuum pump system
that the terminal controls
.

Every time a vacuum pump system is used with
a hand terminal, it is essential to ensure a
correct match between the two components. Use
the paging function for this purpose (see
Actuating the vaccum pump system, page 29).

Additionally it is possible to use color stickers to
indicate which hand terminal belongs to which
vacuum pump system (see chapter 11
. Ordering
information).
WARNING
Uncontrolled operation may result in personal injury
and damage to the vacuum pump system.
If the wireless connection between the hand terminal
and vacuum pump system is broken, the vacuum
pump system will continue to operate with the cur
-
rent settings.

Immediately determine and remove t
he cause of
the interruption between the hand terminal and
vacuum pump system (chapter 10, page 40).

If you are not able to reestablish wireless
contact, replace the hand terminal back to the
vacuum pump system (chapter 8.1.1, page 23).
The vacuum pump system can also be operated
directly and the ventilation valve and coolant
valve can be opened and closed directly
(chapter 8.2, page 32).
WARNING
Personal injury caused by poisoning or explosion
and damage to the vacuum pump system.

Make sure that no reactive or explosive mixtures
will be produced when ventilating the vacuum
pump system through the air inlet.