KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating manual
Stainless steel table scales
KERN FOB
Type FOB-S
Version 2.3
2020-07
Type FOB NS
Type TFOB-NL-A
Type TFOB-LM-A
Type TFOB-A
D-72336 Balingen
Fax: +49-[0]7433-9933-149
GB
FOB-BA-e-2023
KERN FOB
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 (Gen eral) ........................................................................ 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 ons ............................................................................ 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 and FOB-LM 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 ...................................................................................................................... 23
7.5 Initial Commissioning ................................................................................................................ 24
7.6 Adjustment ................................................................................................................................ 24
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
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
2 FOB-BA-e-2023
GB
Version 2.3 2020-07
Operating manual
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
FOB-BA-e-2023 3
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)
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
Weighing plate, stainless steel
(mm)
Weight kg (net) 650 g
Auto off 2 min
Battery 9 V block
Input voltage Appliance 9 V / 100 mA
500 g (M1) 5000 g (M1)
170 x 150 x 40
120 x 150
Service life 20 h
Input voltage Mains adapter 230 V / 50 Hz
4 FOB-BA-e-2023
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)
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
Weighing plate, stainless steel
(mm)
Weight kg (net) 650 g
Auto off Options: 2, 3, 4, 5, min; off
Battery 9 V block
Input voltage Appliance 9 V / 100 mA
500 g (M1) 5000 g (M1)
170 x 150 x 40
120 x 150 x 10
Service life 24 h
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP65
FOB-BA-e-2023 5
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)
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
Weighing plate, stainless steel
(mm)
Weight kg (net) 3.8 kg
Auto off 2 min
Battery 4 x 1.5 V AA
3 kg (M1) 5 kg (M1)
285 x 255 x 90
252 x 200 x 14
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
6 FOB-BA-e-2023
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)
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
Weighing plate, stainless steel
(mm)
Weight kg (net) 3.8 kg
Auto off 2 min
Battery 4 x 1.5 V AA
Battery 4 x 1.5 V AA
10 kg (M1) 30 kg (M1)
285 x 255 x 90
252 x 200 x 14
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-2023 7
calibration weight (A/D converter
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)
Range for zero point adjustment
(A/D converter value)
Range for adjustment w i th
value)
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)
Weight kg (net) 3.8 kg
1 kg (M1) 2 kg (M1)
3000 - 120000 3000 - 120000
30000 – 50000 40000 – 65000
252 x 200 x 14
Auto off 2 min
Battery 4 x 1.5 V AA
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP67
8 FOB-BA-e-2023
Service life background illumination ON: 48 h
Service life background illumination OFF: 66 h
KERN FOB 6K-3LM FOB 10K-3LM
calibration weight (A/D converter
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)
Range for zero point adjustment
(A/D converter value)
Range for adjustment w i th
value)
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)
Weight kg (net) 3.8 kg
5 kg (M1) 10 kg (M1)
3000 - 120000 3000 - 10000
55000 – 80000 55000 – 80000
252 x 200 x 14
Auto off 2 min
Battery 4 x 1.5 V AA
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 230 V / 50 Hz
IP protection IP67
FOB-BA-e-2023 9
Service life background illumination ON: 48 h
Service life background illumination OFF: 66 h
KERN FOB:
KERN FOB 1.5K0.5 FOB 3K1 FOB 6K2
Item no./ Type TFOB 1K-4-A TFO B 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)
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)
Weight kg (net) 1.8 kg
Auto off 2 min
Rechargeable battery Standard
1.5 kg (M1) 3 kg (M1) 6 kg (M1)
175 x 165 x 7
Input voltage Appliance 12 V / 500 mA
Input voltage Mains adapter 100V - 240 V, 50 Hz
2 Declaration of conform ity
The current EC/EU Conformity declaration can be found online in:
www.kern-sohn.com/ce
10 FOB-BA-e-2023
3 Appliance overview
KERN FOB-NS:
KERN FOB-NL:
3.1 Components
KERN FOB-S:
FOB-BA-e-2023 11
KERN FOB:
1
3
2
5
6
KERN FOB-LM:
Pos. Description
1 Weighing pan
2 Keyboard
3 Display
4 Rechargeable battery charge display
5 Levelling screw
6 Bubble level (below weighing pan)
12 FOB-BA-e-2023
3.2 Keyboard overview
Button Description Description
ON/OFF-button
TARE-key
UNIT-button
• Turn on/off
• Taring
• Zeroing
• Taring
• Zeroing
• Switching the display background illumination
on/off (long key press)
• Taring
• Zeroing
• Switching the display background illumination
on/off (long key press)
• Switch-over weighing unit
HOLD button
Models FOB-S:
• Call up hold function
• Calling up tolerance weighing (FOB models only)
FOB-BA-e-2023 13
Models FOB-NS:
Models FOB-NL:
Models FOB-LM:
14 FOB-BA-e-2023
g, lb, oz, ozt, dwt
Weighing units
Display
Description
g, lb, oz, ozt, dwt
Models FOB:
3.3 Overview of display Models FOB-S / FOB-NS:
Display Description
Models FOB-NL:
HOLD
NET
Stability display
Weighing Units
Stability display
Display hold function
Display net weight
FOB-BA-e-2023 15
Models FOB-LM:
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
The next to the icon is displayed when:
HOLD
NET
the data-hold function is active
the weight value is a net weight value
the balance is in toleranc e weig hi ng m ode
16 FOB-BA-e-2023
Models FOB:
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
The next to the icon is displayed when:
HOLD
NET
the data-hold function is active
the weight value is a net weight value
the balance is in tolerance weighing mode
FOB-BA-e-2023 17
4 Basic Information (General)
4.1 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 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-related f ault s and des tr uc ti on o f the bala nce.
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
18 FOB-BA-e-2023
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
5.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
balances.
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.
FOB-BA-e-2023 19
7 Unpacking, Setup and Commi s 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 ndensation 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 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.
20 FOB-BA-e-2023
7.2.1 Placing
• Balance
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.
7.2.2 Levelling (FOB and FOB-LM 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:
• 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.
FOB-BA-e-2023 21
Illustration example KERN FOB-LM
Illustration example KERN FOB
Fasten the weighing plate support on the
7.3.1 Assembly or disassembly of the protection hood Models FOB-S, FOB-NS, FOB-NL, FOB
Unlock weighing pan in the
direction of the arrow
Remove or replace the protection
hood
Models FOB-LM:
balance with the help of the thre e
delivered screws.
After that attach the weighing plate.
22 FOB-BA-e-2023
FOB-NS
FOB-NL, FOB-LM
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 :
When you t ighten the battery cover, make sure that not too much pressure
is put on the weighing plate. The load cell may be damaged.
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.
FOB-BA-e-2023 23
7.5 Initial Commissioning
In order to obtain exact results with the electronic balances, your bala nc e 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 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.
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-2023
Models FOB-S, FOB-NS, FOB-NL, FOB::
Balance display Operation
ò
(example)
ò
• 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.
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.
(example)
Take away adjustment weight
The balance changes into weighing mode.
Adjustment has now been completed successfully.
FOB-BA-e-2023 25
x>) is
If the service menu is brought up after the password has been entered, the
entered, the verification is lost, as the value of the integrated counter
Models FOB-LM:
• For balances which need to be verified, the calibration function is blocked.
• Following each calibration, the integrated counter value (<Con
increased by one.
•
verification is lost, as the value of the integrated counter (<Con x>) is
increased by ‘1’.
Calibration procedure:
• If the calibration menu is brought up after the password has been
(<Con x>) is increased by ‘1’.
26 FOB-BA-e-2023
x value is
3 times. Then release the
, the numerical value will be
the decimal position
Press TARE to confirm, "00" will be displayed.
. Wait until the stabilisation indicator is displayed,
ion has been completed
Balance indication Operation
Switch the balance off.
Press the ON/OFF button and hold it down.
When the ON/OFF is held down and Con
displayed, press UNIT
ON/OFF button.
A "0000" password request will be displayed.
Enter "9810" or “9788”password.
When you press TARE
increased; when you press UNIT,
is changed.
To confirm the entered data, press ON/OFF button
The integrated counter value will be displayed.
Put on a calibration weight (see chapter. 1 Technical
data)
press TARE to confirm.
"CAL" will be displayed.
The balance will switch to the weighing mode.
Switch the balance off and then on again.
Con value will be increased by "1".
(example)
This means the calibrat
successfully.
FOB-BA-e-2023 27
8 Verification (FOB-LM models only)
General introduction:
According to EU directive 2014/31/EU 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.
28 FOB-BA-e-2023
9 Operation
9.1 Simple weighing Balance display Operation
• Turn on balance by pressing the ON/OFF key.
(example)
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“
• 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.
FOB-BA-e-2023 29
The available weighing units depend on the model and verification of the
on the balance, the unit in which the balance has been
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
• Deposit weighing container.
(example)
The weight of the container is displayed.
Press the TARE button, the zero display
disappears.
The weight of the container is now internally saved.
Place weighed items in the weighing container.
(Example FOB-NS)
(Example FOB-NL)
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 net weight of the weighed items is displayed.
For L models, a triangle appears below the NET
symbol.
balance, see chap. 1 "T echni c al data".
When swit ching-
switched off, will be displayed.
30 FOB-BA-e-2023
9.4 Hold function (FOB, FOB-NL/-LM/ models only))
Balance display
Operation
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:
• Turn on balance by pressing the ON/OFF key.
The balance will carry out a self-test.
• Wait for „0“ display
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
(example)
appears and the weight value obtained is displayed.
By pressing the HOLD button several times, the
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.
balance returns to weighing mode. The triangle
disappears.
Press the TARE key for approx. 3 sec.
FOB-BA-e-2023 31
Optical signal /
display
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
Target weight within
tolerance range
Target weight below lower
tolerance limit
Target weight above upper
tolerance limit
+
If <Err> is displayed, the
maximum load of the
balance is exceeded.
Acoustic signal
2 short beeps
no beep
perpetual tone
background
illumination of the
32 FOB-BA-e-2023
Call function:
Set limit values:
• 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.
• To change the flashing digit, press the TARE button repeatedly until the desi r ed
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 digi t flashes . T he upp er tolerance mark is displayed. The
display lights red.
• To change the flashing digit, press the TARE button repeatedly until the desi r ed
value is displayed. Select the next digit with the UNIT key and set the value with
the TARE key. Repeat process for each digit.
FOB-BA-e-2023 33
• 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
The tolerance mark
next to "-" is displayed
Load within specified
tolerance
The tolerance mark
next to "" is displayed
Load exceeds specified
tolerance
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
34 FOB-BA-e-2023
10 Menu
and for approx. 3 s until <SET> is displayed, then release
↓
→
10.1 Call up menu
Models FOB-S/-NS
Models FOB-NL/-LM
Models FOB
Models FOB-LM
10.2 Navigation in the menu
All models (except FOB):
• In weighing mode, hold down the TARE key until <SET>
• Switch off the balance
• Press and hold the ON/OFF key. Press the TARE key 3
• Switch off the balance.
• Press the ON/OFF and TARE buttons simultaneously
• In the weighing mode press and hold UNIT button until
followed by <UNIT> is displayed.
times simultaneously, then release both keys. <SET>
followed by <UNIT> is displayed.
both keys.
<SET> and then <Aoff> is displayed.
Button Navigation Description
• Passing through menu items from top to
TARE-key
UNIT-button
Models FOB:
Button Navigation Description
UNIT-button
TARE-key
10.3 Exit menu / return to weighing mode
↓
→
bottom
• Confirm selection
• Passing through menu items from left to right
• Passing through menu items from left to right
• Confirm selection
Select menu item <END> and confirm with the TARE key.
FOB-BA-e-2023 35
1
Model FOB 500-1S
2
Model FOB 5K1S
10.4 Menu o verview
10.4.1 Models FOB-S
*Preset values may only be modified by trained and specialized personnel.
10.4.2 Models FOB-NS
*not documented
36 FOB-BA-e-2023
10.4.3 Models FOB-NL
10.4.4 Models FOB-LM
Verified:
Menu items relevant for verification are not available for verified balances.
FOB-BA-e-2023 37
Not verified:
On non-verified balances, the contacts on the PCB must be short-circuited with
a jumper. All menu items are available.
38 FOB-BA-e-2023
10.4.5 Models FOB
FOB-BA-e-2023 39
(example)
10.5 Menu settings
10.5.1 Setting weighing units
Balance display Operation
FOB-S / FOB-NS:
ò
(example)
• 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
• Use to change to the desired uni t
• Press the TARE key, "OFF" is displayed
• Press the UNIT key to change to "On
(example)
• Press the TARE key, the selected unit will be
displayed thus being set.
40 FOB-BA-e-2023
• 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 k ey, "End" is displayed
• Press the TARE key, to return to the weighing
mode.
In order to switch off the units display, proceed as described above and
set the selected unit to „Off“.
• Switch between the set units using the UNIT key
FOB-BA-e-2023 41
then release both keys.
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
FOB-S / FOB-NS:
• In weighing mode, press and hold the TARE button
ò
for approx. 3 seconds.
„SEt“, followed by „Unit“ is displayed
ò
ò
ò
FOB-NL:
• Switch off the balance
• Press and hold the ON/OFF key and
simultaneously press the TARE key 3 times and
Press the UNIT key, "AOFF" is displayed
• 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
ò
42 FOB-BA-e-2023
• Press the TARE key to confirm your selection,
The auto-off function is only possible in battery operation.
This function is deactivat ed during mains operation.
"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.
FOB-BA-e-2023 43
11 Error reports
Battery empty
Overload - The weight on
the weighing platform
exceeds the capacity of
the balance.
Insert new batteries or connect the
balance to the power supply using
the AC adapter.
Reduce load
Underload
Zero range when switching
on
Zero setting range
exceeded at switch-on
Software error Contact your retailer
Increase the load, if the error
message remains, please contact
your retailer
Check that the weighing pan is
correctly seated
Remove objects from the w eighing
pan
44 FOB-BA-e-2023
12 Servicing, maintenance, di s pos al
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.
FOB-BA-e-2023 45
The displayed weight does
(Rechargeable) batteries are inserted incorrectly or
The displayed weight is
The weighing result is
13 Ins t a nt hel p
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
not glow.
permanently changing
obviously incorrect
• The balance is not switched on.
• The mains supply connection has been interrupted
(mains cable not plugged in/ faul ty).
• Power supply interrupted.
•
empty
• No (rechargeable) batteries inserted.
• 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 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 error
message remains inform manufacturer.
46 FOB-BA-e-2023
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