WELBA TW-31 User manual

1. Introduction
106104 –TW-31-E - V1.9 - 06.04.2021 Page 1
Tank monitor
TW-31
Quick start for the farmer
Measuring - Controlling - Regulating
All from the same source
Programmable via
configuration software
WELBA „KONSOFT"

1. Introduction
Page 2106104 –TW-31-E - V1.9 - 06.04.2021
1. Introduction................................................................................................................................................ 3
1.1 Information about this operating instructions................................................................................... 3
1.2 Device description............................................................................................................................ 3
1.3 Warning notices in these operating instructions.............................................................................. 4
1.4 Limitation of liability.......................................................................................................................... 4
1.5 Function power pack + regular exchange........................................................................................ 5
2. Operation................................................................................................................................................... 6
2.1 Setting the date and time................................................................................................................. 6
2.2 Operating and display elements ...................................................................................................... 7
2.2.1 Button functions .................................................................................................................. 7
2.2.2 Description of the LEDs ...................................................................................................... 8
2.3 Reading out the tank guard LOG file ............................................................................................... 9
3. Operation and fault handling................................................................................................................... 10
3.1 Description of tank monitor operation............................................................................................ 10
3.2 Optical presentation of alarms....................................................................................................... 11
3.3 Milk removal YES or NO................................................................................................................ 12
3.4 Handling multiple faults.................................................................................................................. 15
3.5 Display fault memory ..................................................................................................................... 15
3.6 Listing fault memory and description ............................................................................................. 16
3.6.1 Critical tank monitor alarms (red)...................................................................................... 16
3.6.2 Informative tank monitor alarms (green)........................................................................... 17
3.6.3 System alarms .................................................................................................................. 19
3.6.4 System alarms external sensors....................................................................................... 19
4. Cleaning instructions............................................................................................................................... 20
Publisher:
Welba GmbH
Electronic Control Engineering
Gewerbepark Siebenmorgen 6
D-53547 Breitscheid
Fon:
Fax:
+49 (0)2638 / 9320-0
+49 (0)2638 / 9320-20
[e-mail]
www.welba.de

1. Introduction
106104 –TW-31-E - V1.9 - 06.04.2021 Page 3
1. Introduction
1.1 Information about this operating instructions
This quick start is for the operator of the tank monitor. The document comprises all
instructions and information for the operation of the tank monitor.
Read this document carefully and follow the instructions provided to ensure a smooth
operation of the. In addition, the local accident prevention regulations and general
safety regulations for the application area of the tank monitor must be observed.
1.2 Device description
The tank monitor TW-31 fully automatically monitors all processes (cooling, storage
and cleaning processes) in milk cooling tanks. The objective here is to be able to
remedy problems with the milk storage early enough by early alerting in order to
prevent economic damage.
Automatic detection of the operating mode
The TW-31 detects independently the mode (cooling, cleaning or empty) of the con-
nected milk cooling tank. Depending on the mode it stores the temperature of the
tank at different intervals. If the temperatures are beyond the set limits, the farmer or
the tank driver is alerted visually as well as acoustically. The exact error cause can
be determined via the alarm code shown on the display.
Alarms
The TW-31 distinguishes between informative and critical alarms.
- The informative alarm (blinking green LED) signals to the farmer an improper
operation -> action required
- The critical alarm “DO NOT LOAD” (blinking red LED) addresses the driver of
the milk-collecting-truck. Together with the farmer the driver decides what to
do next.
In addition to the two warning LEDs, an external warning light, an audible signal
device or dialer can be connected.
You will find the description of the operation method in section 3.1.
Function monitoring
In addition to the temperatures the proper functioning of all agitators and the proper
cleaning process of the milk tank are monitored. In case of errors the corresponding
alarms are also generated.
Power failure
With the integrated power pack the temperatures are monitored and stored even in
the case of a power failure. Thus the TW-31 can continue its work during a power
failure and activate an alarm.

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to section 1.2: Device description
Data storage/-evaluation
The determined data of the last 300 days (max.) temperatures, alarms, operating
mode changes, etc.) are stored in the CSV-format and can thus be opened in other
programs.
The data can be read out by simply inserting a standard USB-stick into the USB
socket - without further operation of the tank monitor.
EMAIL or SMS remote maintenance modems
By an optional Email or SMS remote maintenance modem error messages can be
sent via Email or SMS to inform the farmer at an early stage.
1.3 Warning notices in these operating instructions
Important safety information in these assembly instructions are identified by sym-
bols. These instructions on occupational safety must be adhered to and followed. In
these cases, behave particularly carefully in order to avoid accidents, personal injury
and property damage.
In addition to the information in these assembly instructions, the general and local
safety and accident prevention regulations must also be observed and instructed!
Nature and source of danger
This warning signs warns of an imminent danger to health and life of people. Failure
to comply with this warning will result in extremely serious injuries, including death.
Nature and source of danger
This warning signs warns of possible property damage.
Failure to observe this warning signs can lead to further damage to the system, loss
of data or damage to the milk.
Nature and source of danger
This warning signs warns of possible operating faults. Failure to observe these warn-
ing signs can lead to loss of data or damage to the milk.
Note
General notes contain application tips and particularly useful information, but no
warnings about dangers.
1.4 Limitation of liability
The proper function of the TW-31 depends on many external factors on
which the manufacturer has no influence. The manufacturer accepts no
liability for any damages on the milk cooling tank, the connected
components or the milk. The tank monitor supports only the control of
the milk quality and does neither absolve the farmer (as operator of the
milk tank) nor the driver of the milk collecting truck from the duty of
WARNING
WARNING
NOTICE
DANGER!
ATTENTION

1. Introduction
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care. Both parties have to ensure that the milk is transportable before
it is removed from the tank.
Access to the environment when connected must be restricted to spe-
cialised personnel.
The tank monitor may only be opened by an authorized electrician!
The setting or changing of parameters may only be carried out by the
system manufacturer or the service technician!
Important information on operation
The tank monitor must not be operated, when
- the housing is open or damaged
- the front foil is damaged (leaking)
- the time and date are not set correctly
If four bars appear in the display after a longer power failure, the time
setting is lost and must be set again! See section 2.1
No liquid may get inside the housing!
1.5 Function power pack + regular exchange
Charged (!) Batteries must be used at all times for the tank guard to
function properly!
The batteries are used to maintain the tank guard function in the event of a power
failure. During the power failure, the error code (F30) flashes in the display.
Fault message (F39)
If the fault message (F39) appears, the battery voltage is too low. The batteries can
be removed and recharged by a qualified electrician. Are the batteries older than two
years => replace!
IMPORTANT NOTICE ABOUT THE ACCUMULATORS
The life of the accumulators is limited. The built-in accumulators must
be replaced by new ones every two years at the latest.
Only (!) charged accumulators of the following specification may be
used: 1.2 V NiMh - size AA (min. 2.000 mAh)
Since the tank guard may not be opened by laypeople, the replacement
of the batteries may only be carried out by a qualified electrician
DO NOT USE BATTERIES !!! EXPLOSIVE !!!!!
DANGER!
ATTENTION
WARNING

2. Operation
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2. Operation
2.1 Setting the date and time
In the event of a power cut the date and time are retained for up to 5 days.
After that they must be re‑entered.
When the power is connected...
... there are two possible displays:
1) Time is lost: 4 dashes are shown:
The date and time must be re-entered. Proceed as follows:
Press one of the arrow keys: the year appears, flashing.
Set the time as described below.
2.) Time is still preserved:
During initialisation, 4 rotating bars are shown, then the current firmware appears
briefly, then the time is displayed. If it is not correct, adjust it as follows.
Setting the time during normal operation
Press the SET button: a time is displayed.
If the correct time is displayed, no further steps are necessary.
If the wrong time is displayed
Hold the SET button down until the year appears, flashing.
(in between, the tank temperature is shown briefly)
Use the arrow keys to set the correct year
Press the SET button: the month appears, flashing.
Use the arrow keys to set the correct month.
Press the SET button: the day appears, flashing.
Use the arrow keys to set the correct day.
Then set the hour and minute displays in the same way.
When finished press the SET button.
The setting is finished. Depending on the operation mode of the cooling tank the
display shows the current temperature in the tank or the time.
INFORMATION: Switching to summer- / winter time
The tank monitor can be configured for "automatic summer / winter time change-
over". Talk to your service technician.
Year
Date
Time
NOTICE

2. Operation
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2.2 Operating and display elements
2.2.1 Button functions
In case of a trouble-free working process the TW-31 does not require any handling
with the following exception:
- in case of setting the clock (see section 2.1)
- in case of reading and confirming error codes (see section 3.5).
„SET“ button
in case of normal operation =
brief pressing: Displays the current time,
hold 3 seconds: Set date and time
If the red LED is flashing =
display of the current error codes
See section 3.5
„ARROW BUTTONS“
for setting the time or adjusting parameters
Operation by the driver of the milk-truck
„RESET“ button
Confirmation of the message “Do not load”. See section 3.3
Function test "Do-Not-Load LED" and "external alarm light":
Press reset button for 5 seconds: the alarm will go off for 10 seconds.

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2.2.2 Description of the LEDs
Display of the modes
“TANK EMPTY” detected
After a successful cleaning the tank can be filled with milk.
Operating mode “COOLING” detected
Cooling operation is active
Operating mode “CLEANING” detected
The cleaning operation is active
All LEDs off
Check the tank content
Tank monitor
LED (green) ”MILK COLLECTION OK”
permanent
blinking
off
everything is ok –milk can be loaded
informative alarm
a) if red LED is flashing or blinking
b) after the confirmation of an informative alarm
LED (red) ”DO NOT LOAD!”
blinking
permanent
critical alarm
critical alarm –has already been confirmed
Data transfer
LED (blue) "Data”
blinking
permanent flashing
and goes off after 5 sec.
off
USB-stick inserted: Data are transferred
USB-stick inserted:
Data transfer successfully completed
No USB-stick inserted
For the procedure for reading out the LOG files, see next page.

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2.3 Reading out the tank guard LOG file
Proceed as follows:
Insert a standard USB stick (FAT-32) into the USB socket of the tank monitor:
- The blue "DATA" LED begins to look slowly after a short time =>
The tank monitor LOG file is transferred to the USB stick!
Depending on the evaluation period [parameter h90], this transfer can take
several minutes.
- Has the data transfer been completed without faults:
The blue "DATA" LED lights up permanently for approx. 5 seconds and then
goes out.
- If the data transfer is faulty:
The blue "DATA" LED flashes quickly for approx. 5 seconds and then goes
out.
Try again or use a different USB stick.
If the LED has gone out: remove the USB stick and close the cover cap tightly.
File names of the tank monitor LOG files:
When reading out the tank monitor data on a USB stick, the tank monitor automati-
cally defines the file name of the data file:
DATA-000.CSV
If this file name is already on the stick, the next higher number is used:
DATA-001.CSV
The files on the USB stick can be displayed with the Welba KONSOFT.
NOTICE

3. Operation and fault handling
Page 10 106104 –TW-31-E - V1.9 - 06.04.2021
3. Operation and fault handling
3.1 Description of tank monitor operation
During the entire cooling and cleaning process the tank monitor checks the operation
of all processes to guarantee the perfect condition of the milk. Errors are displayed
flashing on the display via corresponding error codes. Depending on the type of
alarm two LEDs (red and green) flash or blink additionally.
In case of errors which may jeopardise the milk quality, the problem is indicated by
the red LED as a “critical alarm”. In this case milk must not be filled into the tank
unless a careful check has been carried out!
The tank monitor “knows” the following alarm types:
Critical tank monitor alarms (red LED + error code in the display)
During cooling mode:
- minimum and maximum milk temperature
- agitator function and stirring intervals
- duration of power failure
- milk temperature too high for a long period of time
During cleaning:
- cleaning temperatures
- cleaning time
Informative tank monitor alarms (green LED + error code in the display)
During cooling mode:
- milk temperature too high for a long period of time
- milk temperature too low
- malfunction agitator and agitator times
- maximum time until next cleaning
- duration of the power failure
During cleaning:
- cleaning temperatures
- detergent dosage and exposure time
Additional system-alarms (only error code on display)
(Depending on parameterization they can be both, critical or informative).
During cooling mode:
- cooling time first milking
- broken sensor
- short-circuit of sensor, etc.
During cleaning:
- monitoring of butterfly valve, rinsing pump,
cleaning pump etc.
- times for water intake and outlet
- heating times, etc.

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3.2 Optical presentation of alarms
No Alarm
Each alarm has its own displaycode (see section 6.5). Informative and critical alarms
are additionally displayed by LED as follows:
active informative alarm
(After RESET permanently green again)
active critical alarm
critical alarm after RESET
(Turns off when cleaning cycle runs for at least 10 minutes)
active critical + informative alarm
critical + informative alarm –1 x RESET
critical + informative alarm –multiple RESET
In case of several alarms, the RESET button has to be
pressed several times. See section 3.4)
(Turns off when cleaning cycle runs for at least 10 minutes)
is displayed only as a blinking display code
Informative alarm
Critical alarm
Informative and
critical alarm
System alarms

3. Operation and fault handling
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3.3 Milk removal YES or NO
Examples for the use of the tank monitor.
ATTENTION:
Do not simply confirm the alarms of the tank monitor.
It is essential to investigate and remedy the cause of the alarm in order
to avoid harmful effects on the milk!!!!!!
Even without an alarm message, the operator of the equipment has to
ensure the transportability of the milk!!!!!
No alarm –Milk may be drawn off.
The driver goes to the TW-31 and checks the tank monitor.
If the green LED is on, milk may be drawn off.
Once the milk has been taken, the driver starts the cleaning process.
Informative alarm - Milk may be drawn off.
The driver checks the LEDs at the tank monitor
The green LED is blinking –alarm horn sounds - error code on display.
Milk can be removed -> farmer has to be informed.
The farmer investigates ((and remedies) the cause of the error and presses
the button “RESET” -> the alarm horn stops.
The farmer presses button “RESET” once again -> the green LED flashes
permanently.
(The informative alarm is confirmed and deleted by the push button).
Once the milk has been removed, the driver starts the cleaning process.
Remark:
If the informative alarm is not reset, the green LED and the error code will con-
tinue to blink on the display -> even after the next cleaning cycle.
* if parametrized
Green = on
Red = off
no alarm
Green = flashing
Red = off
Informative alarm
(Press RESET button)
after RESET
Green = on
Red = off
Informative alarm
WARNING

3. Operation and fault handling
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to section 3.3: Milk removal YES or NO
Critical alarm - Milk must not be taken out.
The driver checks the LEDs at the tank monitor.
The red LED is blinking or flashing, an error code is displayed and an alarm
horn sounds.
The driver informs the farmer -> together they investigate the cause of the
critical alarm. (The critical alarm codes are retrieved from the display and
identified by means of the error table. See section 3.6).
Farmer and driver determine together whether the milk can be fed into the
tank, despite the alarm.
With the RESET-button the farmer confirms the alarm ->
the alarm horn stops –the red LED continuous to flash.
The farmer presses the RESET-button again ->
the red LED flashes permanently.
After emptying the tank the cleaning process has to be started.
Only when the cleaning cycle has been active for at least 10 minutes, the tank
monitor automatically resets all critical alarms.
Green = an
Red = flashing
critical alarm
(press RESET button)
after RESET
Green = off
Red = on
critical alarm

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to section 3.3: Milk removal YES or NO
Critical + informative alarm - Milk must not be taken out.
Der The driver checks the LEDs at the tank monitor.
Green and red LEDs are blinking, an error is displayed and an alarm horn
sounds.
The driver informs the farmer -> together they investigate the cause of the
critical and informative alarms. (The alarm codes are retrieved from the
display and identified by means of the error table. See section 3.6).
Farmer and driver determine together whether the milk can be fed into the
tank, despite the alarm.
With the RESET-button the farmer confirms the critical alarm at first -> the
alarm horn stops.
The farmer presses the RESET-button again -> the red LED flashes
permanently.
Afterwards the farmer confirms the informative alarm -> the green LED turns
off.
After emptying the tank the cleaning process has to be started.
Only when the cleaning cycle has been active for at least 10 minutes, the tank
monitor resets automatically all critical alarms.
Green = flashing
Red = flashing
critical + informative alarm
(press RESET button)
after RESET
Green = flashing
Red = on
critical + informative alarm
(press RESET button)
after second RESET
Green = off
Red = on
critical + informative alarm
OK
ALARM

3. Operation and fault handling
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3.4 Handling multiple faults
For every alarm - whether informative (green) or critical (red) –an error code blinks
in the display.
If several faults occur simultaneously, the code for the most recently occurring fault
blinks in the display.
If both informative and critical faults occur, priority is always given to the critical error
code (in the example this would be fault F10)
Exception in cooling mode: sensor faults flash alternately with critical or informative
alarms.
Cancelling faults: (both LEDs flash alternately)
The most recently occurring fault (example F10) blinks in the display.
Press RESET button -> The horn switches off, the most recently occurring fault
(example F10) continues to blink in the display.
Identify the fault using the list of faults -> Press RESET button -> the red LED
continues to flash in order to indicate that there are further critical faults.
The next fault (in the example F11) blinks in the display:
Identify the fault using the list of faults -> Press RESET button -> etc.:
When the last critical fault (example F02) has been reset:
(red LED permanently lit)
The first informative fault (example F34) blinks in the display:
Identify the fault using the list of faults -> Press RESET button ->
The green LED continues to flash in order to indicate that there are further
informative faults.
The next informative fault (example F20) flashes in the display...
When the last informative fault has been reset the green LED goes out while
the red LED stays on permanently.
It is only when the cleaning cycle is active for at least 10 minutes that the tank monitor
resets all critical alarms.
3.5 Display fault memory
If the red LED of the tank monitor flashes permanently it means that critical errors
have already been confirmed, but still exist. These error codes are registered in the
internal error memory of the unit. They can be read out as follows:
Display of the last 5 critical errors from the fault memory
Press SET-button: The display indicates the code of the first critical error
(in the example above F02).
Press SET-button again: the next error code (in example F05) is indicated..
If no button is pressed for 3 seconds the display switches back to temperature and
time.
Only when the cleaning cycle has been active for at least 10 minutes, the tank
monitor resets automatically all critical alarms.
Cancelled critical faults are
transferred to the device's in-
ternal fault memory and can be
consulted at any time.
Informative
alarm
Critical
alarm
NOTICE

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Page 16 106104 –TW-31-E - V1.9 - 06.04.2021
3.6 Listing fault memory and description
3.6.1 Critical tank monitor alarms (red)
F1
Milk temperature too high for too long 1
The milk temperature is monitored throughout the complete cooling cycle.
A stopwatch runs whenever the milk temperature is above the pre-set limit
temperature "1". If the total time the temperature was exceeded reaches
the maximum permitted duration, the alarm F1 is displayed. There is an
acute risk that the milk will be sour.
EXAMPLE: Milk temperature was above 13°C for a total of more than 10
hours.
F2
Milk temperature too high for too long 2
as F1, but based on limit temperature "2"
EXAMPLE:
Milk temperature was above 16°C for a total of more than 6 hours.
F3
Milk temperature too high for too long 3
as F1, but based on limit temperature "3"
EXAMPLE:
Milk temperature was above 28°C for a total of more than 5 hours.
F6
Power failure alarm
Alarm is only possible, if all power packs are charged!
The alarm is activated if a power failure lasts longer than the time set by
the fitter and at the same time the milk temperature is higher than the set
temperature limit.
EXAMPLE: A power failure lasted longer than 5 hours and the milk tem-
perature is above 7°C.
NOTE: The alarms F11 to F16 can also be configured as "INFORMATIVE
ALARMS" depending on the pre-setting!
F11
Minimum washing temperature not reached
Alarm is triggered if the minimum water temperature (e.g. 40°) has not
been reached during the main wash cycles.
F12
Minimum acting time not reached
Alarm is triggered if the minimum water temperature (e.g. 40 °) has not
been effective long enough (e.g. 2 minutes) within the main wash cycles.
F13
Cleaning time too short
Alarm is activated if the cleaning stops before the set minimum cleaning
time (e.g. 35 min.)
The display blinks to
indicate faults.
NOTICE

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F15
Agitator fault in cooling mode (no milk agitating)
Alarm is triggered after starting the cooling mode if no counter pressure
from the milk has been detected on the agitator after a certain period of
time.
F16
“No stirring” time exceeded
Alarm is triggered when a certain time has passed after the last agitator
operation without the agitator restarting - or the minimum running time has
not been reached.
3.6.2 Informative tank monitor alarms (green)
F17
Cooling not activated after “first milk comes into the tank” time 1
When the cleaning is finished, the tank monitor can detect that warm milk
is entering. If incoming milk is detected, the cooling must switch on within
the pre-set time "1". If this is not the case, alarm F17 is output.
F18
Cooling not activated after “first milk comes into the tank” time 2
like F17, but after the pre-set time "2" has elapsed.
F19
Cooling not activated after “first milk comes into the tank” time 3
like F17, but after the pre-set time "3" has elapsed
F20
Cooling time exceeded for first milking
Alarm is triggered if the pre-set milk temperature (e.g. 6°C) has not been
reached within the pre-set time (e.g. 3 hours).
The time starts when cooling of the first milking starts.
F21
Cooling time exceeded
Alarm is triggered if, after the detection of "first milk comes into the tank",
the pre-set milk temperature (e.g. 8°C) has not been reached within the
pre-set time (e.g. 3.5 hours).
F22
Forgotten to switch on the cooling
Alarm is triggered if the cooling was not switched on at the pre-set milking
times.
F23
Milk temperature too high for too long
Same functionality as error F1 - F3.
Here a shorter time interval can be entered to warn the farmer ahead of
time.
This alarm serves as a pre-alarm to avoid "red alarms".
F25
Excess temperature directly
Alarm is triggered if the temperature rises above a second limit value (e.g.
25°C) again after the target temperature has fallen below the target tem-
perature (e.g. 6°C) for the first time.
F27
Milk temperature too low for too long
Alarm is triggered if the milk temperature is too long (e.g. 2 hours) too low
(e.g. 2°C). The timer restarts each time the temperature is exceeded.
F29
Low temperature directly
The alarm is triggered as soon as the milk temperature falls below the
pre-set temperature. (Ice protection)
F30
Power cut directly
An alarm is activated in the event of a power failure.
The alarm can only occur when the accumulators are charged.

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to section 3.6: Listing fault memory and description
F31
Max. cooling interruption or cleaning not started
Safety function! (This is to prevent that after manual interruption of the
cooling mode is forgotten, to reactivate it or to start the cleaning after the
milk removal.)
Alarm is triggered if, after switching off the cooling, a new cooling or
cleaning mode is not recognized within a pre-set time.
F32
Max. time without
(Timer starts after cleaning is finished or after power ON)
Safety function! (This is to prevent people from forgetting to start cooling
mode after cleaning has finished.)
The timer starts as soon as the cleaning mode is ended. Alarm is trig-
gered if a new cooling or cleaning mode is not started within a preset time
F33
Min. cleaning interval
Timer starts after detection of “cleaning finished”. Alarm is activated if
within a pre-set time a new cleaning start is not detected.
F34
Time / date not set
The alarm is triggered if the date and time are lost.
F35
Detergent “empty” alkaline
Alarm is activated only during the cleaning if the float switch detects “de-
tergent alkaline empty”.
F36
Detergent “empty” acidic
Alarm is activated only during the cleaning if the float switch detects “de-
tergent acidic empty”.
F38
Exceeding of temperature difference, monitoring sensor
The alarm can function only if the optional monitoring sensor is installed
and parameters set.
As soon as the temperatures differ by the set value, the alarm is triggered.
F39
Battery voltage too low
The alarm is triggered if the battery charge is no longer sufficient.
See section 1.5

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to section 3.6: Listing fault memory and description
3.6.3 System alarms
F45
Water in the tank after cleaning end
- washing completed
- level electrode reports water in the cleaning line
- the red LED “FAULT” flashes
At the end of the draining phase there is still water in the tank.
Possible cause of fault:
- Water valve has not closed / is faulty
- Draining phase set too short
F53
Thermal protection compressor
The motor protection switch for the compressor contactor of the tank and
the ice water preparer is activated.
F56*
Broken sensor
The control unit is not receiving any signals from the sensor.
Possible cause of fault:
- Temperature sensor faulty
- Sensor cable damaged
F57*
Sensor short circuit
as F56, but fault code F57 is displayed.
F58*
Sensor range exceeded
Sensor reports upward or downward exceeding of measuring range
as F56, but fault code F58 is displayed.
F59*
Signal error mode detection
If the tank monitor receives different signals for the mode detection (trig-
ger signal for cooling and cleaning at the same time), error F59 is dis-
played.
3.6.4 System alarms external sensors
F60*
Erroneous communication with agitator monitoring module
and phase error (only for ESVAW-003).
F61*
Erroneous communication with GSM-module
F85*
Phase error
Error is displayed when the power module ESVAW-003 (if available) de-
tects a phase error.
* Call a service technician.

4. Cleaning instructions
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4. Cleaning instructions
The enclosure front (front foil) can be cleaned with usual detergents.
ATTENTION: The enclosure front is not resistant to aggressive acids
and alkalis, abrasive cleaners and cleaning with high-pressure clean-
ers.
The use of these cleaners and cleaning methods may lead to damages!
WARNING