KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Stainless steel table scales
KERN FOB
Type FOB-S
Type FOB NS
Type FOB-NL
Type FOB-LM
Type FOB
Version 2.0
2018-08
GB
FOB-BA-e-1820
2 FOB-BA-e-1820
GB
KERN FOB
Version 2.0 2018-08
Operating manual
Stainless steel table scales
Contents
1 Technical data ................................................................................................ 4
2 Declaration of conformity ........................................................................... 10
3 Appliance overview ..................................................................................... 11
3.1 Components ............................................................................................................................. 11
3.2 Keyboard overview ................................................................................................................... 13
3.3 Overview of display .................................................................................................................. 15
4 Basic Information (General ) ........................................................................ 18
4.1 Proper use ................................................................................................................................ 18
4.2 Improper Use ............................................................................................................................ 18
4.3 Warranty ................................................................................................................................... 18
4.4 Monitoring of Test Resources................................................................................................... 19
5 Basic Safety Precauti on s ............................................................................ 19
5.1 Pay attention to the instructions in the Operation Manual ........................................................ 19
5.2 Personnel training ..................................................................................................................... 19
6 Transport and storage ................................................................................. 19
6.1 Testing upon acceptance ......................................................................................................... 19
6.2 Packaging / return transport ..................................................................................................... 19
7 Unpacking, Setup and Commissioning ..................................................... 20
7.1 Installation Site, Location of Use .............................................................................................. 20
7.2 Unpacking ................................................................................................................................. 20
7.2.1 Placing ...................................................................................................................................... 21
7.2.2 Levelling (FOB models only) .................................................................................................... 21
7.2.3 Scope of delivery ...................................................................................................................... 21
7.3 Mains connection ...................................................................................................................... 21
7.3.1 Assembly or disassembly of the protection hood ..................................................................... 22
7.4 Battery operation ...................................................................................................................... 22
7.5 Initial Commissioning ................................................................................................................ 23
7.6 Adjustment ................................................................................................................................ 23
8 Verification (FOB-LM models only) ............................................................ 28
9 Operation ...................................................................................................... 29
9.1 Simple weighing ....................................................................................................................... 29
9.2 Taring ........................................................................................................................................ 30
9.3 Switch-over weighing unit ......................................................................................................... 30
9.4 Hold function (FOB, FOB-NL/-LM/ models only)) ..................................................................... 31
9.5 Display background illumination (FOB, FOB-NL/-LM/ models only) ........................................ 31
9.6 Weighing with tolerance range (FOB, FOB-LM models only) .................................................. 32
FOB-BA-e-1820 3
10 Menu ............................................................................................................. 35
10.1 Call up menu ............................................................................................................................ 35
10.2 Navigation in the menu ............................................................................................................. 35
10.3 Exit menu / return to weighing mode ........................................................................................ 35
10.4 Menu overview ......................................................................................................................... 36
10.4.1 Models FOB-S ...................................................................................................................... 36
10.4.2 Models FOB-NS ................................................................................................................... 36
10.4.3 Models FOB-NL.................................................................................................................... 37
10.4.4 Models FOB-LM ................................................................................................................... 37
10.4.5 Models FOB ......................................................................................................................... 39
10.5 Menu settings ........................................................................................................................... 40
10.5.1 Setting weighing units .......................................................................................................... 40
10.5.2 Automatic switch-off function „AUTO OFF“ in stand-by mode ............................................. 42
11 Error reports ................................................................................................. 44
12 Servicing, maintenance, disposal .............................................................. 45
12.1 Cleaning.................................................................................................................................... 45
12.2 Servicing, maintenance ............................................................................................................ 45
12.3 Disposal .................................................................................................................................... 45
13 Instant help ................................................................................................... 46
4 FOB-BA-e-1820
1 Technical data
KERN FOB-S, FOB-NS:
KERN FOB 500-1S FOB 5K1S
Readability (d) 0.1 g 1 g
Weighing range (max) 500 g 5000 g
Reproducibility 0.1g 1 g
Linearity ± 0.2 g ± 2 g
Weighing Units g, lb, oz, dwt, ozt
Recommended adjustment
weight, not added (class)
200 g / 500 g (M1) 2000 g / 5000 g (M1)
Warm-up time 10 min
Stabilization time (typical) 2 sec.
Operating temperature + 10° C .... + 40° C
Humidity of air 25% - 95% (non-condensing)
Housing stainless steel
(B x D x H) mm
170 x 150 x 40
Weighing plate, stainless steel
(mm)
120 x 150
Weight kg (net) 650 g
Auto off 2 min
Battery 9 V block
Service life 20 h
Input voltage Appliance 9 V / 100 mA
Input voltage Mains adapter 230 V / 50 Hz
FOB-BA-e-1820 5
KERN FOB 0.5K-4NS FOB 5K-3NS
Readability (d) 0.1 g 1 g
Weighing range (max) 500 g 5000 g
Reproducibility 0.1g 1 g
Linearity ± 0.2 g ± 2 g
Weighing Units g, lb, oz, ozt, dwt
Recommended adjustment
weight, not added (class)
500 g (M1) 5000 g (M1)
Warm-up time 10 min
Stabilization time (typical) 2 sec.
Operating temperature + 10° C .... + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing stainless steel
(B x D x H) mm
170 x 150 x 40
Weighing plate, stainless steel
(mm)
120 x 150 x 10
Weight kg (net) 650 g
Auto off Options: 2, 3, 4, 5, min; off
Battery 9 V block
Service life 24 h
Input voltage Appliance 9 V / 100 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP65
6 FOB-BA-e-1820
FOB-NL:
KERN FOB 3K-4NL FOB 7K-4NL
Item no./ Type TFOB 3K-4NL-A
Readability (d) 0,2 g 0.5 g / 1 g
Weighing range (max) 3 kg 5 kg / 7.5 kg
Reproducibility 0.5 g / 1 g 0.5 g / 1 g
Linearity ± 0.6 g ± 1.5 g / 3 g
Recommended adjustment
weight, not added (class)
3 kg (M1) 5 kg (M1)
Warm-up time 30 min 30 min
Weighing Units g, lb, oz g, lb, oz, ozt, dwt
Stabilization time (typical) 2 sec.
Operating temperature + 5° C …. + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing stainless steel
(B x D x H) mm
285 x 255 x 90
Weighing plate, stainless steel
(mm)
252 x 200 x 14
Weight kg (net) 3.8 kg
Auto off 2 min
Battery 4 x 1.5 V AA
Service life background illumination ON: 48 h
Service life background illumination OFF: 66 h
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP67
FOB-BA-e-1820 7
KERN FOB 10K-3NL FOB 30K-3NL
Readability (d) 1 g / 2 g 2 g / 5 g
Weighing range (max) 8 kg / 15 kg 16 kg / 30 kg
Reproducibility 1 g / 2 g 2 g / 5 g
Linearity ± 3 g / 6 g ± 6 g / 15 g
Recommended adjustment
weight, not added (class)
10 kg (M1) 30 kg (M1)
Warm-up time 30 min 30 min
Weighing Units g, lb, oz, ozt, dwt
Stabilization time (typical) 2 sec.
Operating temperature + 5° C …. + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing stainless steel
(B x D x H) mm
285 x 255 x 90
Weighing plate, stainless steel
(mm)
252 x 200 x 14
Weight kg (net) 3.8 kg
Auto off 2 min
Battery 4 x 1.5 V AA
Battery 4 x 1.5 V AA
Service life background illumination ON: 48 h
Service life background illumination OFF: 66 h
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP67
8 FOB-BA-e-1820
KERN FOB-LM:
KERN FOB 1K-4LM FOB 3K-3LM
Item no./ Type TFOB 1K-4LM-A TFOB 3K-3LM-A
Readability (d) 0.5 g 1 g
Weighing range (max) 1.5 kg 3 kg
Verification value (e) 0.5 g 1 g
Verification class III III
Minimum weight (min) 10 g 20 g
Reproducibility 0.5 g 1 g
Linearity ± 1.5 g ± 2 g
Recommended adjustment
weight, not added (class)
1.5 kg (M1) 3 kg (M1)
Warm-up time 10 min 10 min
Weighing unit g
Stabilization time (typical) 2 sec.
Operating temperature + 5° C …. + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing (B x D x H) mm 285 x 255 x 90
Weighing plate, stainless steel
(mm)
252 x 200 x 14
Weight kg (net) 3.8 kg
Auto off 2 min
Battery 4 x 1.5 V AA
Service life background illumination ON: 48 h
Service life background illumination OFF: 66 h
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP67
FOB-BA-e-1820 9
KERN FOB 6K-3LM FOB 10K-3LM
Item no./ Type TFOB 6K-3LM -A TFOB 10K-3LM-A
Readability (d) 2 g 5 g
Weighing range (max) 6 kg 15 kg
Verification value (e) 2 g 5 g
Verification class III III
Minimum weight (min) 40 g 100 g
Reproducibility 2 g 5 g
Linearity ± 4 g ± 10 g
Recommended adjustment
weight, not added (class)
6 kg (M1) 15 kg (M1)
Warm-up time 10 min 10 min
Weighing unit g
Stabilization time (typical) 2 sec.
Operating temperature + 5° C …. + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing (B x D x H) mm 285 x 255 x 90
Weighing plate, stainless steel
(mm)
252 x 200 x 14
Weight kg (net) 3.8 kg
Auto off 2 min
Battery 4 x 1.5 V AA
Service life background illumination ON: 48 h
Service life background illumination OFF: 66 h
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP67
10 FOB-BA-e-1820
KERN FOB:
KERN FOB 1K-4 FOB 3K-3 FOB 6K-3
Item no./ Type TFOB 1K-4-A TFOB 3K-3-A TFOB 6K-3-A
Readability (d) 0.5 g 1 g 2 g
Weighing range (max) 1.5 kg 3 kg 6 kg
Reproducibility 0.5 g 1 g 2 g
Linearity 1.5 g 3 g 6 g
Recommended adjustment
weight, not added (class)
1.5 kg (M1) 3 kg (M1) 6 kg (M1)
Warm-up time 10 min
Weighing Units g, lb, oz
Stabilization time (typical) 2 sec.
Operating temperature + 5° C …. + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing (B x D x H) mm 235 x 175 x 62
Weighing plate, stainless steel
(mm)
175 x 165 x 7
Weight kg (net) 1.8 kg
Auto off 2 min
Rechargeable battery Standard
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 100V - 240 V, 50 Hz
2 Declaration of conformity
The current EC/EU Conformity declaration can be found online in:
www.kern-sohn.com/ce
FOB-BA-e-1820 11
3 Appliance overview
3.1 Components
KERN FOB-S:
KERN FOB-NS:
KERN FOB-NL, FOB-LM:
12 FOB-BA-e-1820
KERN FOB:
Pos. Description
1 Weighing pan
2 Keyboard
3 Display
4 Rechargeable battery charge display
5 Levelling screw
6 Bubble level (below weighing pan)
1
3
2
5
6
FOB-BA-e-1820 13
3.2 Keyboard overview
Button Description Description
ON/OFF-button
• Tu rn on/off
TARE-key
• Taring
• Zeroing
• Taring
• Zeroing
• Switching the display background illumination
on/off (long key press)
UNIT-button
• Switch-over weighing unit
HOLD button
• Call up hold function
• Calling up tolerance weighing (FOB models only)
Models FOB-S:
Models FOB-NS:
14 FOB-BA-e-1820
Models FOB-NL:
Models FOB-LM:
Models FOB:
FOB-BA-e-1820 15
3.3 Overview of display
Models FOB-S / FOB-NS:
Models FOB-NL:
Display Description
g, lb, oz, ozt, dwt
Weighing units
Stability display
Display
Description
g, lb, oz, ozt, dwt
Weighing Units
Stability display
HOLD
Display hold function
NET
Display net weight
16 FOB-BA-e-1820
Models FOB-LM:
The next to the icon is displayed when:
HOLD
the data-hold function is active
NET
the weight value is a net weight value
the balance is in tolerance weighing mode
Display Description
g
Weighing unit
Stability display
Zero display
Battery charge display
When the display shows that the battery capacity
is exhausted, the balance will automatically switch off after
30 seconds.
LED lights up when the power adapter is connected
FOB-BA-e-1820 17
Models FOB:
The next to the icon is displayed when:
HOLD
the data-hold function is active
NET
the weight value is a net weight value
the balance is in tolerance weighing mode
Display Description
g
Weighing unit
Stability display
Zero display
Rechargeable battery charge display
Rechargeable battery charge display
• LED lights green when the rechargeable battery is fully
charged
• LED flashes green when rechargeable battery is being
charged
18 FOB-BA-e-1820
4 Basic Information (General)
4.1 Proper use
The balance you purchased is intended to determine the wei g hi ng value of mat eri al
to be weighed. It is intended to be used as a “non-automatic balance”, i.e. the
material to be weighed is manually and carefully placed in the centre of the weighing
pan. As soon as a stable weighing value is reached the weighing value can be read.
4.2 Improper Use
Do not use balance for dynamic weighing. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results can be
displayed due to the “stability compensation“. (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-rel ated faul ts and des tr uct ion 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.
4.3 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 and damage caused by media, liquids,
Natural wear and tear
• The appliance is improperly set up or incorrectly electrically connected
• The measuring system is overloaded
FOB-BA-e-1820 19
4.4 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.
5 Basic Safety Precautions
5.1 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.
All language versions contain a non-binding translation.
The original German document is binding.
5.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
6 T ransport and storage
6.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
6.2 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
platform, power unit etc. against shifting and damage.
20 FOB-BA-e-1820
7 Unpacking, Setup and Commis si oning
7.1 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 (co nd ens a ti on o f air humidi ty 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 weighed items or weighing container.
Major display deviations (incorrect weighing results) may be experienced should
electromagnetic fields (e.g. due to mobile phones or radio equipment), static
electricity accumulations or instable power supply occur. Change location or remove
source of interference.
7.2 Unpacking
Carefully remove the weighing balance from the packaging and install it at the
designated work place.
FOB-BA-e-1820 21
7.2.1 Placing
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.
7.2.2 Levelling (FOB models only)
Level balance with foot screws until the air bubble of the water balance is in the
prescribed circle.
Check levelling regularly.
7.2.3 Scope of delivery
Serial accessories:
• Balance
• Weighing pan
• Mains adapter (option KERN FOB-A01, all models except models FOB)
• Mains adapter (standard, FOB models only)
• Battery (all models except FOB models)
• Rechargeable battery (standard, FOB models only)
• Protective cover
• Operating manual
7.3 Mains connection
The balance may be operated via the optional mains adapter. The stated voltage
value must be the same as the local voltage. Only use original KERN mains
adapters. Using other makes requires consent by KERN.
Illustration example KERN FOB-LM
Illustration example KERN FOB
22 FOB-BA-e-1820
7.3.1 Assembly or disassembly of the protection hood
Unlock weighing pan in the
direction of the arrow
Remove or replace the protection
hood
7.4 Battery operation
Remove battery cover at the lower side of the housing. Insert Battery, see. Chap. 1
"Technical Data".
Put battery cover back in place and tighten it.
Illustration example :
FOB-NS
FOB-NL, FOB-LM
When you tighten the battery cover, make sure that not too much pressure
is put on the weighing plate. The load cell may be damaged.
FOB-BA-e-1820 23
In the menu you can activate the AUTO-OFF function (see chap. 10.5.2 “Automatic
switch-off function“). According to the selected settings, the balance switches
automatically off in order to spare the battery.
The empty battery is indicated on the display by „LobAt“. Press ON/OFF-key and
replace the battery/ies immediately.
If the balance is not used for a longer time, take out the battery/ies and store it/them
separately. Leaking battery liquid could damage the balance.
7.5 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. 1). During this
warming up time the balance must be connected to the power supply (mains or
battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
7.6 Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each balance must be coordina ted - 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.
The adjustment should be made with the recommended adjustment weights (see
chap. 1 "Technical data").
Procedure when adjusting:
Observe stable environmental conditions.
A warming up time (see chapter 1; Technical Data) is required for stabilization.
Ensure that there are no objects on the weighing plate.
24 FOB-BA-e-1820
Models FOB-S
Balance display Operation
Turn on balance by pressing the ON/OFF key
The balance carries out an autotest and changes
then into the weighing mode, the zero display „0.0“
appears
ò
ò
ô
(example)
ô
(example)
Press the UNIT-key for approx. 3 seconds, „CAL“
appears shortly, then „CAL 0“ and after that „LoAd“
is displayed alternately with the value of the first
adjustment weight.
Place the first adjustment weight in the middle of the
weighing plate.
After a short time the value of the second
adjustment weight is displayed alternately with
„LoAd“
Remove the first adjustment weight from the
weighing pan and place the second adjustment
weight centrically on the weighing pan.
Adjustment will be carried out automatically after
stability control.
„donE“ will be shortly displayed. Then the value of
the second adjustment weight will be displayed.
Adjustment has now been completed successfully.
The balance is now in weighing mode.
FOB-BA-e-1820 25
Models FOB-NS:
Balance display Operation
ò
(example)
• Switch off the balance
• Hold down the ON/OFF key, simultaneously press
the UNIT key 3 times, release the ON/OFF key - an
internal numerical value is displayed.
ò
(example)
Press the TARE key, "0" is displayed
Put adjustment weight centrically on the weighing
plate and press the TARE-key, "CAL" is displayed,
followed by the value of the put adjustment weight.
Take away adjustment weight
The balance changes into weighing mode.
Adjustment has now been completed successfully.
26 FOB-BA-e-1820
Models FOB-NL, FOB:
Balance display Operation
ò
(example)
• Switch off the balance
• Hold down the ON/OFF key, simultaneously press
the UNIT key 3 times, release the ON/OFF key - an
internal numerical value is displayed.
ò
(example)
Press the TARE key, "0" is displayed
Put adjustment weight in the centre of the weighing
plate, wait for stability display and press the TARE
key,
"CAL" is displayed, followed by the value of the
adjustment weight.
Take away adjustment weight
The balance changes into weighing mode.
Adjustment has now been completed successfully.
FOB-BA-e-1820 27
Models FOB-LM:
• The adjustment is locked for verified balances.
• To override the blocked access you will have to destroy the seal before
calling up the menu and to short-circuit the two contacts on the circuit
board, using a jumper, item see chap. 8).
• Ensure menu setting , see chap. 10.4.4
• After each adjustment, the internal counter (<Con x>) is incremented by
one.
Balance display Operation
ò
(example)
• Switch off the balance
• Hold down the ON/OFF key, simultaneously press
the UNIT key 3 times, release the ON/OFF key - an
internal numerical value is displayed.
ò
(example)
Press the TARE key, "0" is displayed
Put adjustment weight in the centre of the weighing
plate and press the TARE-key, "CAL" is displayed,
followed by the value of the put adjustment weight.
Take away adjustment weight
The balance changes into weighing mode.
Adjustment has now been completed successfully.
28 FOB-BA-e-1820
8 Verification (FOB-LM models only)
General introduction:
According to EU directive 2009/23/EC balances must be officially verified if they are
used as follows (legally controlled area):
a) For commercial transactions if the price of goods is determined by weighing.
b) For the production of medicines in pharmacies as well as for analyses in the
medical and pharmaceutical laboratory.
c) For official purposes
d) For manufacturing final packages
In cases of doubt, please contact your local trade in standard.
Verification notes:
An EU type approval exists for balances described in their technical data as
verifiable. If a balance is used where obligation to verify exists as described above, it
must be verified and re-verified at regular intervals.
Re-verification of a balance is carried out according to the respective national
regulations. The validity for verification of balances in Germany is e.g. 2 years.
The legal regulation of the country where the balance is used must be observed!
Verification of the balance is invalid without the seal.
The seal marks attached on balances with type approval point out that the
balance may only be opened and serviced by trained and authorised
specialist staff. If the seal mark is destroyed, verification looses its validity.
Please observe all national laws and legal regulations. In Germany a reverification will be necessary.
Jumper position:
FOB-BA-e-1820 29
9 Operation
9.1 Simple weighing
Balance display Operation
• Turn on balance by pressing the ON/OFF key.
The balance will carry out a self-test.
Await zero display
Should the balance not display exactly "0" despite
unloaded weighing pan, press the TARE key. The
balance returns to „0“
(example)
• Place weighed items on balance.
Wait until the stability display appears.
Read weighing result.
• To turn off the balance, press the ON/OFF-key
shortly.
30 FOB-BA-e-1820
9.2 Taring
The dead weight of any weighing container may be tared away by pressing a button,
so that the following weighing procedures show the net weight of the goods to be
weighed.
Balance display Operation
(example)
• Deposit weighing container.
The weight of the container is displayed.
Press the TARE button, the zero display
disappears.
The weight of the container is now internally saved.
(Example FOB-NS)
(Example FOB-NL)
Place weighed items in the weighing container.
The net weight of the weighed items is displayed.
For L models, a triangle appears below the NET
symbol.
9.3 Switch-over weighing unit
According to the requirements the balance can be switched over into different units.
These are set in the menu.
In the weighing mode, press the UNIT key to toggle to the selected weighing units.
The available weighing units depend on the model and verification of the
balance, see chap.1 "Technic al data".
When switc hing-
on the balance, the unit in which the balance has been
switched off, will be displayed.
FOB-BA-e-1820 31
9.4 Hold function (FOB, FOB-NL/-LM/ models only))
The balance has an integrated standstill function (mean value calculation).
With this it is possible to weigh unstable samples to be weighed exactly.
There are 2 possibilities:
Balance display
Operation
• Turn on balance by pressing the ON/OFF key.
The balance will carry out a self-test.
• Wait for „0“ display
(example)
Put the weighed item in place and press the HOLD
key; "HOLD" will appear and a small triangle
flashes. During this time, an average value is
recorded.
The triangle will stop flashing, the stability display
appears and the weight value obtained is displayed.
By pressing the HOLD button several times, the
balance returns to weighing mode. The triangle
disappears.
9.5 Display background illumination (FOB, FOB-NL/-LM/ models only)
The balance has the ability to turn the backlight of the display on or off.
Press the TARE key for approx. 3 sec.
32 FOB-BA-e-1820
9.6 Weighing with tolerance range (FOB, FOB-LM models only)
You can set an upper or lower limit when weighing with tolerance range and thus
ensure that the weighed load remains exactly within the set limits.
During tolerance tests such as dosing, portioning and sorting the unit will indicate
exceeded or undershot limits by emitting an optical or acoustic signal.
Displayed
triangle next to
Weight of the weighed
item
Acoustic signal
Optical signal /
background
illumination of the
display
Target weight within
tolerance range
2 short beeps
-
Target weight below lower
tolerance limit
no beep
+
Target weight above upper
tolerance limit
If <Err> is displayed, the
maximum load of the
balance is exceeded.
perpetual tone
FOB-BA-e-1820 33
Call function:
• Press and hold the HOLD key for three seconds in the weighing mode. The
tolerance weighing mode is displayed.
The display for entering the lower limit value appears, the first digit flashes. The
lower tolerance mark is displayed.
Set limit values:
• To change the flashing digit, press the TARE button repeatedly until the desired
value is displayed. Select the next digit with the UNIT key and set the value with
the TARE key.
• Repeat process for each digit.
• Confirm entry with the HOLD key. The display for entering the upper limit value
appears, the first digit flashes. The upp er tolerance mark is displayed. The
display lights red.
• To change the flashing digit, press the TARE button repeatedly until the desired
value is displayed. Select the next digit with the UNIT key and set the value with
the TARE key. Repeat process for each digit.
34 FOB-BA-e-1820
• Finish the input with the HOLD-key, from here, you can determine whether the
weighed item is within the two tolerance limits.
Tolerance weighing
Tare when using a weighing container.
Put on goods to be weighed, tolerance control is started. The visual and acoustic
signals indicate whether the weighed item is within the two tolerance limits.
Load below specified
tolerance
Load within specified
tolerance
Load exceeds specified
tolerance
The tolerance mark
next to "-" is displayed
The tolerance mark
next to "" is displayed
The tolerance mark
next to "+" is displayed
Return to weighing mode:
• Press and hold the HOLD key for three seconds to exit the tolerance weighing
mode
FOB-BA-e-1820 35
10 Menu
10.1 Call up menu
Models FOB-S/-NS
• In weighing mode, hold down the TARE key until <SET>
followed by <UNIT> is displayed.
Models FOB-NL/-LM
• Switch off the balance
• Press and hold the ON/OFF key. Press the TARE key 3
times simultaneously, then release both keys. <SET>
followed by <UNIT> is displayed.
Models FOB
• Switch off the balance.
• Press the ON/OFF and TARE buttons simultaneously
and for approx. 3 s until <SET> is displayed, then release
both keys.
10.2 Navigation in the menu
All models (except FOB):
Button Navigation Description
TARE-key
• Passing through menu items from top to
bottom
• Confirm selection
UNIT-button
• Passing through menu items from left to right
Models FOB:
Button Navigatio
n
Description
UNIT-button
• Passing through menu items from top to
bottom
TARE-key
• Confirm selection
• Passing through menu items from left to right
10.3 Exit menu / return to weighing mode
Select menu item <END> and confirm with the TARE key.
36 FOB-BA-e-1820
10.4 Me nu overvi ew
10.4.1 Models FOB-S
*Preset values may only be modified by trained and specialized personnel.
1
Model FOB 500-1S
2
Model FOB 5K1S
10.4.2 Models FOB-NS
*not documented
FOB-BA-e-1820 37
10.4.3 Models FOB-NL
10.4.4 Models FOB-LM
Verified:
Menu items relevant for verification are not available for verified balances.
Weighing mode
38 FOB-BA-e-1820
Not verified:
On non-verified balances, the contacts on the PCB must be short-circuited with
a jumper. All menu items are available.
FOB-BA-e-1820 39
10.4.5 Models FOB
40 FOB-BA-e-1820
10.5 Menu settings
10.5.1 Setting weighing units
Balance display Operation
ò
FOB-S / FOB-NS:
• In weighing mode, press and hold the TARE button
for approx. 3 seconds.
„SEt“, followed by „Unit“ is displayed
FOB-NL:
• Switch off the balance
Press and hold the ON/OFF key and simultaneously
press the TARE key 3 times and then release both
keys.
Press the TARE key again, the weighing unit "g" is
displayed
(example)
• Use to change to the desired unit
• Press the TARE key, "OFF" is displayed
(example)
• Press the UNIT key to change to "On
(example)
• Press the TARE key, the selected unit will be
displayed thus being set.
FOB-BA-e-1820 41
• Press the UNIT key until " Unit" is displayed
• Press the UNIT key, "A.Off" is displayed
• Press the UNIT key, "CAP." is displayed
• Press the UNIT key, "End" is displayed
• Press the TARE key, to return to the weighing
mode.
• Switch between the set units using the UNIT key
In order to switch off the units display, proceed as described above and
set the selected unit to „Off“.
42 FOB-BA-e-1820
10.5.2 Automatic switch-off function „AUTO OFF“ in stand-by mode
The balance offers the possibility of the automatic switch-off, when the balance is in
stand-by mode. The switch-off time may be selected as follows:
Balance display Operation
ò
FOB-S / FOB-NS:
• In weighing mode, press and hold the TARE button
for approx. 3 seconds.
„SEt“, followed by „Unit“ is displayed
FOB-NL:
• Switch off the balance
• Press and hold the ON/OFF key and
simultaneously press the TARE key 3 times and
then release both keys.
Press the UNIT key, "AOFF" is displayed
ò
ò
ò
ò
• Press the TARE-key, current setting appears.
• Press the UNIT key to select the desired setting:
120s = Auto off after 120 seconds
180s = Auto off after 180 seconds
240s = Auto off after 240 seconds
300s = Auto off after 300 seconds
OFF = Auto off switched off
FOB-BA-e-1820 43
• Press the TARE key to confirm your selection,
"AOFF" is displayed
• Press the UNIT key, "CAP" is displayed
• Press the UNIT key again, "End" is displayed
• To return to weighing mode, press the TARE- key.
The setting is saved.
The auto-off function is only possible in battery operation.
This function is deactivated duri ng mains operation.
44 FOB-BA-e-1820
11 Error reports
Battery empty
Insert new batteries or connect the
balance to the power supply using
the AC adapter.
Overload - The weight on
the weighing platform
exceeds the capacity of
the balance.
Reduce load
Underload
Increase the load, if the error
message remains, please contact
your retailer
Zero range when switching
on
Check that the weighing pan is
correctly seated
Zero setting range
exceeded at switch-on
Remove objects from the wei g hi ng
pan
Software error Contact your retailer
FOB-BA-e-1820 45
12 Ser vi c ing, maintenance, disposal
12.1 Cleaning
Before cleaning, please disconnect the appliance from the operating voltage.
Clean the stainless-steel parts with a soft cloth soaked with a cleaning agent
suitable for stainless steel.
For stainless steel parts do not use any cleaning agents which contain sodium
hydroxide solution, acetic, hydrochloric, sulphuric or citric acid.
Do not use metal brushes or cleaning sponges of steel wool, as this causes
superficial corrosion.
Spilled weighing goods must be removed immediately.
12.2 Servicing, maintenance
The appliance may only be opened by trained service technicians who are authorized
by KERN.
Before opening, disconnect from power supply.
12.3 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.
46 FOB-BA-e-1820
13 Inst a nt help
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 displayed weight does
not glow.
• The balance is not switched on.
• The mains supply connection has been interrupted
(mains cable not plugged in/ faul ty).
• Power supply interrupted.
•
(Rechargeable) batteries are inserted incorrectly or
empty
• No (rechargeable) batteries inserted.
The displayed weight is
permanently changing
• Draught/air movement
• Table/floor vibrations
• Weighing pan has contact with other objects.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
The weighing result is
obviously incorrect
• The display of the balance is not at zero
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Warm-up time was ignored.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
Should other error messages occur, switch balance off and then on again. If the er ror
message remains inform manufacturer.
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