KERN EOB Series User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Servicemanual
Platform/floor scales
KERN EOB / EOE / EOS
Typ EOB_B
Typ EOE_B
Typ EOS_B
Version 1.1
08/2019
GB
EOB-B_EOE-B_EOS-B-SH-e-1911
Importør:
Impex Produkter AS
Gamle Drammensvei 107
1363 Høvik
www.impex.no
[email protected]
Tel.: [phone]

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GB
KERN EOB-B / EOE-B / EOS-B
Version 1.1 08/2019
Servicemanual
Contents
Basic Information...........................................................................................- 3 -
Introdution......................................................................................................- 3 -
Overview of display .......................................................................................- 4 -
Keyboard overview................................................................................................................- 4 -
Basic Information (General)..........................................................................- 5 -
Proper use..............................................................................................................................- 5 -
Improper Use..........................................................................................................................- 5 -
Warranty .................................................................................................................................- 5 -
Monitoring of Test Resources..............................................................................................- 6 -
Basic Safety Precautions ..............................................................................- 6 -
Pay attention to the instructions in the Operation Manual ...............................................- 6 -
Personnel training .................................................................................................................- 6 -
1Transport and storage...................................................................................- 6 -
Testing upon acceptance .....................................................................................................- 6 -
Packaging / return transport ................................................................................................- 6 -
Unpacking, Setup and Commissioning........................................................- 7 -
Installation Site, Location of Use.........................................................................................- 7 -
Unpacking and placing .........................................................................................................- 7 -
Scope of delivery / serial accessories.......................................................................... - 8 -
Battery operation...................................................................................................................- 8 -
Initial Commissioning ...........................................................................................................- 8 -
Adjustment .....................................................................................................- 9 -
Operation......................................................................................................- 10 -
Start-up.................................................................................................................................- 10 -
Switching Off........................................................................................................................- 10 -
Taring....................................................................................................................................- 11 -
Hold function (animal weighing function).........................................................................- 11 -
Menu..............................................................................................................- 12 -
Navigation in the menu.......................................................................................................- 12 -
Menu overview.....................................................................................................................- 12 -
Service menu ............................................................................................- 14 -
LF 1 Weight Calibration : ....................................................................................................- 14 -
LF 2 Spec calibration ..........................................................................................................- 16 -
Servicing, maintenance, disposal ...........................................................- 19 -
Cleaning................................................................................................................................- 19 -
Servicing, maintenance ......................................................................................................- 19 -
Disposal................................................................................................................................- 19 -
Error messages, troubleshooting guide.................................................- 19 -

EOB-B_EOE-B_EOS-B-SH-e-1911 - 3 -
Basic Information
The device must be repaired only by trained specialist staff or personnel with professional formation
(such as a repair-specialist accredited by law concerning verification). The service manual is obligatory
for repair work. After repair, original conditions of the device have to be restored. Only original spare
parts should be used.
Instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval. A violation of this
specification will result in a loss of the type approval! After successful repair the balance will have to
be reverified before it can be used again in a statutorily regulated field.
Detailed instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval. A violation of this
specification will result in a loss of the type approval!
After successful repair the balance will have to be reverified before it can be used again in a statutorily
regulated field.
Introdution
This service manual covers the EOB / EOE / EOS series and is edited for the authorized servicing
personnel.
Note all rights are reserved. Copying any part of this manual is prohibited without our permission.
.

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Overview of display
Example EOB:
Nr.
Description
1
Balance zero display:
Should the balance not display exactly zero despite empty scale pan, press the TARE
button. The balance will be set to zero after a short standby time.
2
Stability display:
If the display shows the stability display [0] the balance is in a stable status. If the status
is instable the [0] display disappears.
3
Stored tare value, see chap. 8.3 „Taring“
4
Gross weight display:
If the gross weight [Gross] appears in the display, the gross weight of the object and
weighing container are displayed.
5
Hold/animal weighing function active, see chap. 8.4
6
Weighing unit [kg lb]
Keyboard overview
Button
Function
Turn on/off balance
Hold/ animal weighing function
Tare balance
Switch-over weighing unit
Back to weighing mode, or to menu

EOB-B_EOE-B_EOS-B-SH-e-1911 - 5 -
Basic Information (General)
Proper use
The balance you purchased is intended to determine the weighing value of material to be
weighed. It is intended to be used as a “non-automatic balance”, i.e. the material to be weighed
is manuallyand carefullyplaced in thecentre ofthe weighing pan.As soon as a stable weighing
value is reached the weighing value can be read.
Improper Use
Do not use balance for dynamic add-on weighing procedures, if small amounts of goods to be
weighed are removed or added. The “stability compensation“ installed in the balance may
result in displaying an incorrect measuring value! (Example: Slowly draining fluids from a
container on the balance.)
Do not leave permanent load on the weighing pan. This may damage the measuring system.
Impacts and overloading exceeding the stated maximum load (max) of the balance, minus a
possibly existing tare load, must be strictly avoided. Balance may be damage by this.
Never operate balance in explosive environment. The serial version is not explosion protected.
The structure of the balance may not be modified. This may lead to incorrect weighing results,
safety-related faults and destruction of the balance.
The balance may only be used according to the described conditions. Other areas of use must
be released by KERN in writing.
Warranty
Warranty claims shall be voided in case
Our conditions in the operation manual are ignored
The appliance is used outside the described uses
The appliance is modified or opened
Mechanical damage or damage by media, liquids, natural wear and tear
The appliance is improperly set up or incorrectly electrically connected
The measuring system is overloaded

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Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the balance and, if
applicable, the testing weight, must be checked regularly. The responsible user must define a
suitable interval as well as type and scope of this test. Information is available on KERN’s
home page (www.kern-sohn.com) with regard to the monitoring of balance test substances
and the test weights required for this. In KERN's accredited DKD calibration laboratory test
weights and balances may be calibrated (return to the national standard) fast and at moderate
cost.
Basic Safety Precautions
Pay attention to the instructions in the Operation Manual
Carefully read this operation manual before setup and commissioning,
even if you are already familiar with KERN balances.
Personnel training
The appliance may only be operated and maintained by trained personnel.
1 Transport and storage
Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the appliance itself
when unpacking for possible visible damage.
Packaging / return transport
Keep all parts of the original packaging for a possibly required
return.
Only use original packaging for returning.
Prior to dispatch disconnect all cables and remove loose/mobile
parts.
Reattach possibly supplied transport securing devices.
Secure all parts such as the glass wind screen, the weighing pan,
power unit etc. against shifting and damage.

EOB-B_EOE-B_EOS-B-SH-e-1911 - 7 -
Unpacking, Setup and Commissioning
Installation Site, Location of Use
The balances are designed in a way that reliable weighing results are achieved in common
conditions of use.
You will work accurately and fast, if you select the right location for your balance.
Therefore, observe the following for the installation site:
Place the balance on a firm, level surface;
Avoid extreme heat as well as temperature fluctuation caused by installing next to a
radiator or in the direct sunlight;
Protect the balance against direct draughts due to open windows and doors;
Avoid jarring during weighing;
Protect the balance against high humidity, vapours and dust;
Do not expose the device to extreme dampness for longer periods of time. Non-
permitted condensation (condensation of air humidity on the appliance) may occur if a
cold appliance is taken to a considerably warmer environment. In this case,
acclimatize the disconnected appliance for ca. 2 hours at room temperature.
Avoid static charge of goods to be weighed or weighing container.
If electro-magnetic fields or static charge occur, or if the power supply is unstable major
deviations on the display (incorrect weighing results) are possible. In that case, the location
must be changed.
Unpacking and placing
Open package, take out the appliance and accessories. Verify that there has been no
damage and that all packing items are present.
The balance must be installed in a way that the weighing pan is exactly in horizontal position.
Mount the display unit in a way that facilitates operation and where it is easy to see.

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Scope of delivery / serial accessories
Platform and display unit, see chap. 2
4 x adjustable feet
4 x AA batteries
Wall fixture (with fixing screws)
Operating manual
Battery operation
On the rear side of the display unit remove the battery cover and connect 4 x 1.5V
mignon cells. Reinsert the battery cover.
In order to save the battery, the balance switches automatically off after 3 minutes
without weighing. Additional switch-off times can be set in the menu (function
"A.OFF").
If the batteries are depleted, the battery symbol is displayed.
Switch-off balance and replace batteries at once.
If the balance is not used for a longer time, take out the batteries and store them separately.
Leaking battery liquid could damage the balance.
Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have reached
the operating temperature (see warming up time chap. During this warming up time the
balance must be connected to the power supply (mains, accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
.

EOB-B_EOE-B_EOS-B-SH-e-1911 - 9 -
Adjustment
As the acceleration value due to gravity is not the same at every location on earth, each
balance must be coordinated - in compliance with the underlying physical weighing principle -
to the existing acceleration due to gravity at its place of location (only if the balance has not
already been adjusted to the location in the factory). This adjustment process must be
carried out for the first commissioning, after each change of location as well as in case of
fluctuating environment temperature. To receive accurate measuring values it is also
recommended to adjust the balance periodically in weighing operation.
Observe stable environmental conditions. A warming up time (see chapter 1) is required for
stabilization.
Press and at the same time in weighing mode.
[ECF 1] is displayed.
(The adjustment process can be exited at any time with . The balance returns then to
weighing mode.)
Confirm display of [ECF 1] with . [CAL Z] is displayed.
Acknowledge with . [--------] followed by [LOAdi] will be
displayed briefly. Then the display to input the recommended
adjustment weight is displayed
(see chap. 1 "Technical data")
The left digit flashes.
Enter the value of the adjustment weight as follows:
Switch to the next digit to the right with .
Increase number with .
Confirm the value entered with .
(example)

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The specified adjustment weight is displayed flashing.
(example)
Place the adjustment weight centrically on the weighing pan and
confirm with . "CAL Y" will flash briefly and a signalling
tone will sound. Adjustment will be performed. Then the balance
returns automatically into the weighing mode.
An error message will be displayed in the event of an adjustment error or incorrect
adjustment weight. Remove the adjustment weight and repeat the adjustment
process.
Keep the adjustment weight close to the balance. Daily control of the weighing
exactness is recommended for quality-relevant applications.
Operation
Start-up
Start balance by pressing .
The balance will carry out a self-test As soon as the weight
display appears, the balance is ready for weighing.
Should the balance not display exactly zero despite empty weighing pan, press the
button. The balance will be set to zero after a short standby time.
Switching Off
Switch off balance with , the display will go off.

EOB-B_EOE-B_EOS-B-SH-e-1911 - 11 -
Taring
Place an empty weighing container, the weight of the weighing
container will be displayed.
Press , the zero display appears. The indicator [NET] is
displayed. The tare weight is saved until it is deleted.
Weigh the material, the net weight will be indicated.
The taring process can be repeated any number of times,
e.g. when adding several components for a mixture
(adding). The limit is reached when the whole weighing
range is exhausted.
After removing the weighing container, the weight of the
weighing container appears as negative display.
The tare weight is saved until it is deleted.
Delete tare value:
Unload the balance and press , zero display will appear.
Hold function (animal weighing function)
The balance has an integrated animal weighing function (mean value calculation). Using this
function it is possible to weigh domestic or small animals exactly (min. load 1% of the max.
one), although they do not stand quiet on the weighing pan.
Place weighing goods and press . The display will be
blinking [-HOLD] and the indicator [hold] will be displayed.
During this time the balance takes up several measured values
and displays then the calculated mean value.
This value will be displayed until you press again. The
indicator [hold] turns off, the balance will return to the normal
weighing mode.
By pressing again, this function can be repeated any
number of times.
(example)

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There is no average value calculation in the event of too much movement (heavy
display oscillation).
Menu
Navigation in the menu
Press and at the same time in weighing mode. [UF 1] is displayed.
Press as often as necessary until the required function is displayed.
Confirm selected function by . The current setting will be displayed. Select the
desired parameter with . Return to menu by .
Press to exit the menu. The balance returns automatically into weighing mode.
Menu overview
(example)
Internal value
not documented
*
Auto-Off
Automatic shutdown function
Can be set between 1-99 minutes
Display background illumination
Adjustable:
Background lighting on
Background lighting off
*
Backlight automatically off

EOB-B_EOE-B_EOS-B-SH-e-1911 - 13 -
Hold function (animal weighing function)
Adjustable:
Average value is calculated for unstable weighing
conditions from approx. 20 d
Average value is calculated for unstable weighing
conditions from approx. 5 d
*
Average value is calculated for unstable weighing
conditions from approx. 10 d
Auto Zero
Adjustable:
ZP 0 *
Auto Zero: Off
ZP 1
0.5 d/s
ZP 2
1 d/s
ZP 3
2 d/s
ZP 4
3 d/s
ZP 5
5 d/s
*
G-value (value of the local gravitational
acceleration)
Adjustable
Factory settings are marked by *.

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Service menu
Turn on the scale and press and hold the until the countdown sequence, then
release the and the scale will show
LF 1 Weight calibration
LF 2 Spec Calibration
LF 3 Gravtational (G value) pRe-Calibration
CAL switch hs to be on
Password is required to use when CAL switch is OFF
LF 1 Weight Calibration :
Calibration can be done with any weight, but the weight should not be less than 1/100 of the max.
capacity and not to exceed the max. capacity
Enter the weight calibration will show the last time the weight calibration value, The following are
two sections of the calibration and single calibration of the operation steps
Two sections of the calibration:
Press to enter
Confirm display of [ECF 1] with . [CAL Z] is displayed.
Acknowledge with. [--------] followed by [LOAdii] will be displayed
briefly. Then the display to input the recommended adjustment
weight is displayed
The left digit flashes.
Enter the value of the adjustment weight as follows:
Switch to the next digit to the right with .
Increase number with .
Confirm the value entered with .
(example)
Place the required weight mass onto the scale as indicated on
display and press the ↵key to calibrate the scale
(Press the ESC key to back to menu LF 1)
(example)
Show stop for 2 seconds

EOB-B_EOE-B_EOS-B-SH-e-1911 - 15 -
Use ▶﹑▲ and then ↵key to enter the high weight to be
calibrated
(Press the ESC key to back to menu LF 1)
Place the required weight mass onto the scale as indicated
on display and press the ↵key to calibrate the scale
(Press the ESC key to back to menu LF 1)
Calibration procedure completed and the scale will return
back to weighing mode automatically
Single sections of the calibration
Press to enter
Confirm display of [ECF 1] with . [CAL Z] is displayed.
Acknowledge with. [--------] followed by [LOAdiii] will be displayed
briefly. Then the display to input the recommended adjustment
weight is displayed
The left digit flashes.
Enter the value of the adjustment weight as follows:
Switch to the next digit to the right with .
Increase number with .
Switch to the next digit to the right with .
Increase number with .
Place the required weight mass onto the scale as indicated
on display and press the key to calibrate the scale

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Calibration procedure completed and the scale will return
back to weighing mode automatically
LF 2 Spec calibration
Press to enter
Confirm display of [ECF 1] with . [CAL Z] is displayed.
Internal value
Press to confirm
A : Metric Units 0 : None 1 : kg
B : American Units 0 : None 1 : lb
C : Fixed to 0
D : PCS 0 : Off 1 : On
E : Duo range 0 : Off 1 : Multi interval
F : Calibration Unit
1 : Metric units as calibration unit, single calibration
2 : American units as calibration unit, single calibration
3 : Metric units as calibration unit, two sections calibration
4 : American units as calibration unit, two sections calibration
※The scale will not allow to continue to the next setup step
if an error has occurred during the programming
A B C D E F
Press to confirm
Switch to the next digit to the right with .
Increase number with .
Press to confirm

EOB-B_EOE-B_EOS-B-SH-e-1911 - 17 -
Full range
Flashing 2 seconds
Put in the full range
Switch to the next digit to the right with .
Increase number with .
Press to confirm
Input high division
Switch to the next digit to the right with .
Increase number with .
Only if two point calibration is chosen before
Input low range
Flashing for 2 seconds
Put in the full range
Switch to the next digit to the right with .
Increase number with .
Input high division
Switch to the next digit to the right with .

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Increase number with .
After entering LF 2, the scale will display the last saved setup.
All steps have to be completed to save the changes, otherwise
the scale will keep the last setup
Proceed with Weight Calibration after LF2 Spec Calibration
LF 3 Gravitational (G value) Pre-Calibration:
Sender G value: Set it before Weight Calibration
The G value will be denied when the value is greater than
9.83217 (Polar G value) or less than 9.78031 (Equator G
value)
Factory Default: 9.79423
Switch to the next digit to the right with .
Increase number with .
Press to confirm

EOB-B_EOE-B_EOS-B-SH-e-1911 - 19 -
Servicing, maintenance, disposal
Cleaning
Before cleaning, disconnect the appliance from the operating voltage.
Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth
dampened with mild soap suds. Take care that the device is not penetrated by fluids and
polish it with a dry soft cloth.
Loose residue sample/powder can be removed carefully with a brush or manual vacuum
cleaner.
Spilled weighing goods must be removed immediately.
Servicing, maintenance
The appliance may only be opened by trained service technicians who are authorized by
KERN.
Before opening, disconnect from power supply.
Disposal
Disposal of packaging and appliance must be carried out by operator according to valid
national or regional law of the location where the appliance is used.
Error messages, troubleshooting guide
Error message
Function
hhhhhh
Overload
LLLLLL
Minimum weight under min. value
In case of an error in the program process, briefly turn off the balance and disconnect from
power supply. The weighing process must then be restarted from the beginning.
Help:
Fault
Possible cause
The balance is not switched on.

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The displayed weight does not glow.
The mains supply connection has been
interrupted (mains cable not plugged
in/faulty).
Power supply interrupted.
The displayed weight is permanently
changing
Draught/air movement
Table/floor vibrations
The weighing pan is in contact with foreign
matter.
Electromagnetic fields / static charging
(choose different location/switch off
interfering device if possible)
The weighing value is obviously
wrong
The display of the balance is not at zero
Adjustment is no longer correct.
The balance is on an uneven surface.
Great fluctuations in temperature.
Electromagnetic fields / static charging
(choose different location/switch off
interfering device if possible)
Should other error messagesoccur, switch balance off and then on again. If the errormessage
remains inform manufacturer.