KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating manual
Compact balance
KERN FOB-N
Version 1.0
09/2014
GB
FOB-NS
FOB-NL
D-72336 Balingen
Fax: +49-[0]7433-9933-149
FOB-N-BA-e-1410
KERN FOB-N
Compact balance
GB
Version 1.0 09/2014
Operating manual
Contents
1 Technical data ................................................................................................ 4
2 Basic Information (Gen eral) .......................................................................... 6
2.1 Proper use .................................................................................................................................. 6
2.2 Improper Use .............................................................................................................................. 6
2.3 Warranty ..................................................................................................................................... 6
2.4 Monitoring of Test Resources..................................................................................................... 7
3 Basic Safety Precauti o ns .............................................................................. 7
3.1 Pay attention to the instructions in the Operation Manual .......................................................... 7
3.2 Personnel training ....................................................................................................................... 7
4 Transport and storage ................................................................................... 7
4.1 Testing upon acceptance ........................................................................................................... 7
4.2 Packaging / return transport ....................................................................................................... 7
5 Unpacking, Setup and Commissioning ....................................................... 8
5.1 Installation Site, Location of Use ................................................................................................ 8
5.2 Unpacking ................................................................................................................................... 8
5.2.1 Placing ........................................................................................................................................ 9
5.2.2 Scope of delivery ........................................................................................................................ 9
5.3 Mains connection (optional)........................................................................................................ 9
5.4 Battery operation ........................................................................................................................ 9
5.5 Initial Commissioning ................................................................................................................ 10
5.6 Adjustment ................................................................................................................................ 10
5.7 Adjustment ................................................................................................................................ 10
6 Operating elements ..................................................................................... 13
6.1 Keyboard overview ................................................................................................................... 13
6.1.1 Models FOB-NS: ...................................................................................................................... 13
6.1.2 Models FOB-NL: ....................................................................................................................... 14
6.2 Overview of display .................................................................................................................. 15
6.2.1 Models FOB-NS: ...................................................................................................................... 15
6.2.2 Models FOB-NL: ....................................................................................................................... 15
7 Operation ...................................................................................................... 16
7.1 Simple weighing ....................................................................................................................... 16
7.2 Taring ........................................................................................................................................ 17
7.3 Weighing units switch-over ....................................................................................................... 17
7.4 Hold function (only "L" models) ................................................................................................ 18
7.5 Backlight of the display (only "L" models) ................................................................................ 19
2 FOB-N-BA-e-1410
8 The menu ...................................................................................................... 20
8.1 Call up menu ............................................................................................................................ 20
8.2 Navigation in the menu ............................................................................................................. 20
8.3 Menu overview ......................................................................................................................... 21
8.3.1 Models FOB-NS: ...................................................................................................................... 21
8.3.2 Models FOB-NL: ....................................................................................................................... 21
8.4 Menu settings ........................................................................................................................... 22
8.4.1 Setting weighing units ............................................................................................................... 22
8.4.2 Automatic switch-off function „AUTO OFF“ in stand-by mode ................................................. 24
9 Error messages ............................................................................................ 26
10 Servicing, maintenance, disposal .............................................................. 26
10.1 Cleaning.................................................................................................................................... 26
10.2 Servicing, maintenance ............................................................................................................ 26
10.3 Disposal .................................................................................................................................... 26
11 Instant help ................................................................................................... 27
FOB-N-BA-e-1410 3
1 Technical data
Models „FOB-NS“:
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 (B x D x H) mm 170 x 150 x 40
Weighing plate, stainless steel
(mm)
Weight kg (net) 650 g
Auto off Options: 2, 3, 4, 5, min; off
Battery 9 V block
Secondary voltage powerpack 9 V / 100 mA
IP protection IP65
500 g (M1) 5000 g (M1)
120 x 150 x 10
4 FOB-N-BA-e-1410
Models „FOB-NL“:
KERN FOB 7K-4NL FOB 10K-3NL FOB 30K-3NL
Readability (d) 0.5 g / 1 g 1 g / 2 g 2 g / 5 g
Weighing range (max) 5 kg / 7.5 kg 8 kg / 15 kg 16 kg / 30 kg
Reproducibility 0.5 g / 1 g 1 g / 2 g 2 g / 5 g
Linearity ± 1.5 g / 3 g ± 3 g / 6 g ± 6 g / 15 g
Weighing Units g, lb, oz, ozt, dwt
Recommended adjustment
weight, not added (class)
Warm-up time 30 min 30 min 30 min
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) 3611 g
Auto off 2 min
Battery 4 x 1,5 V AA
Secondary voltage powerpack 9 V / 100 mA
IP protection IP67
5 kg (M1) 10 kg (M1) 30 kg (M1)
252 x 200 x 14
FOB-N-BA-e-1410 5
2 Basic Information (General)
2.1 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
plate. As soon as a stable weighing value is reached the weighing value can be read.
2.2 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 plate. This may damage the measuring
system.
Impacts and overloadi ng 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 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.
2.3 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
6 FOB-N-BA-e-1410
2.4 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.
3 Basic Safety Precautions
3.1 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 is binding.
3.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
4 T ransport and storage
4.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
4.2 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 plate,
power unit etc. against shifting and damage.
FOB-N-BA-e-1410 7
5 Unpacking, Setup and Commi s si oning
5.1 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 goods to be weighed 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.
5.2 Unpacking
Carefully remove the weighing balance from the packaging and install it at the
designated work place.
8 FOB-N-BA-e-1410
• Balance
FOB-NS
FOB-NL
5.2.1 Placing
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.
5.2.2 Scope of delivery Serial accessories:
• Weighing plate
• Mains adapter (optional)
• Protective cover
• Operating manual
5.3 Mains connection (optional)
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 adapter s . Using other makes requires consent by
KERN.
5.4 Battery operation
Unscrew battery cover on the bottom of the housing (see figure 1).
• 9 V block battery (FOB-NS) or
• 4 x 1.5V AA batteries (FOB-NL)
Put battery cover back in place and tighten it.
Fig. 1:
FOB-N-BA-e-1410 9
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.
In the menu you can activate the AUTO-OFF function (see chap. 8.4.2 “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 button and
change the battery/batteries 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.
5.5 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.
5.6 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 carri ed out for the fir st com mis si oni ng , 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.
5.7 Adjustment
The adjustment should be made with the recommended adjustment weights (see
chap. 1 "Technical data").
10 FOB-N-BA-e-1410
Balance display
Operation
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.
Models FOB-NS:
(example)
(example)
Switch off the balance
Press and hold , press 3x at the same
time, release - an internal value is displayed.
Press , "0" is displayed
Put adjustment weight in the centre of the weighing
plate and press , "CAL" is displayed, followed
by the value of the adjustment weight.
Take away adjustment weight
The balance changes into weighing mode.
FOB-N-BA-e-1410 11
Adjustment has now been completed successfully.
Balance display
Operation
Models FOB-NL:
(example)
(example)
Switch off the balance
Press and hold , press 3x at the same
time, release - an internal value is displayed.
Press , "0" is displayed
Put adjustment weight in the centre of the weighing
plate, wait for stability display and press ,
"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.
12 FOB-N-BA-e-1410
Button
Designation
Pressed once and released
6 Operating elements
6.1 Keyboard overview
6.1.1 Models FOB-NS:
[ON/OFF]
[TARE]
[UNIT]
• Turn on/off
• Call up adjustment (press and hold button)
In menu:
• Taring
• Weighing units
switching over
• Invoke adjustment
• Passing through menu
items from top to
bottom
• Passing through menu
items from left to right
FOB-N-BA-e-1410 13
Button
Designation
Pressed once and released
6.1.2 Models FOB-NL:
[ON/OFF]
[TARE]
[UNIT]
[HOLD]
• Turn on/off
• Call up adjustment (press and hold button)
• Taring
• Display bac k ligh t
(press button long
time)
• Weighing units
switching over
• Call up adjustment
(press shortly 3x)
• Call up hold function
In menu:
• Passing through menu
items from top to
bottom
• Passing through menu
items from left to right
14 FOB-N-BA-e-1410
Display
Description
Display
Description
6.2 Overview of display
6.2.1 Models FOB-NS:
g, lb, oz, ozt, dwt Display weighing units
Stability display
6.2.2 Models FOB-NL:
g, lb, oz, ozt, dwt Display weighing units
Stability display
HOLD Display hold function
NET Display net weight
FOB-N-BA-e-1410 15
Balance display
Operation
7 Operation
7.1 Simple weighing
Start balance by pressing .
The balance will carry out a self-test.
Wait for „0“ display
(example)
If the balance should not exactly display "0" despite
the relieved weighing pan, press
("L" models) or
("S" models).
The balance returns to „0“
Place goods to be weighed on balance.
Wait until the stability display appears.
Read weighing result.
To switch off the balance press shortly .
16 FOB-N-BA-e-1410
Balance display
Operation
7.2 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.
Deposit weighing vessel.
(example)
The weight of the container is displayed.
Press ("L" models) or
("S" models),
the zero display appears.
The weight of the container is now internally saved.
Place goods to be weighed in the weighing
(example FOB-NS)
container.
The net weight of the goods to be weighed is
displayed.
For L models, a triangle appears below the NET
symbol.
(example FOB-NL)
7.3 Weighing units switch-over
According to the requirements the balance can be switched over into different units.
These are set in the menu.
In weighing mode, use to change between t h e set units .
FOB-N-BA-e-1410 17
Balance display
Operation
7.4 Hold function (only "L" models)
The balance has an integrated standstill function (mean value calculation). With this it
is possible to weigh unstable samples to be weighed exactly. There ar e 2
possibilities:
1.
Start balance by pressing .
The balance will carry out a self-test.
Wait for „0“ display
(example)
Put sample to be weighed in place and press ;
"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 balance returns to weighing
mode. The triangle disappears.
18 FOB-N-BA-e-1410
Balance display
Operation
2.
Start balance by pressing .
The balance will carry out a self-test.
Wait for „0“ display
Press , "HOLD" will appear and a small
triangle flashes. During this time put samples to be
weighed in place.
The stability display will appear after a short time,
(example)
the triangle will stop flashing and the obtained
weight value is displayed.
By pressing the balance returns to weighing
mode. The triangle disappears.
7.5 Backlight of the display (only "L" models)
The balance has the ability to turn the backlight of the display on or off.
For this purpose press for approx. 3 sec.
FOB-N-BA-e-1410 19
Passing through menu items
8 The menu
8.1 Call up menu „L“-Models:
• Switch off the balance
• Press and hold and press 3x at the same time, then release both
buttons.
„S“-Models:
The menu is accessed by pressing in weighing mode for approx. 3 seconds.
8.2 Navigation in the menu Button Direction in the
(„L“-models)
(„S“-models)
menu
Description
• Passing through menu items
from top to bottom
• Confirm selection
•
from left to right
20 FOB-N-BA-e-1410
8.3 Menu overview
8.3.1 Models FOB-NS:
*not documented
8.3.2 Models FOB-NL:
FOB-N-BA-e-1410 21
Balance display
Operation
8.4 Menu settings
8.4.1 Setting weighing units
FOB-S:
In weighing mode press button for approx.
3 seconds.
(example)
„SEt“, followed by „Unit“ is displayed
FOB-L:
Switch off the balance
Press and hold and press 3x at the
same time, then release bo th but t ons .
Press or again, the weighing unit „g“ is
displayed
Use to change to the desired unit
Press or , "OFF" is displayed
22 FOB-N-BA-e-1410
(example)
(example)
Use to change to „On“
Press or , the selected unit is displayed
and set.
In order to switch off the units display, proceed as described above and
set the selected unit to „Off“.
Press repeatedly until „Unit“ is displayed
Press , „A.Off“ will be shown
Press , „CAP.“ is displayed
Press , „End“ is displayed
Press or to return to weighing mode
Use to change between the set units
FOB-N-BA-e-1410 23
Balance display
Operation
same time, then release both buttons.
8.4.2 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:
FOB-S:
In weighing mode press button for approx.
3 seconds.
„SEt“, followed by „Unit“ is displayed
FOB-L:
• Switch off the balance
• Press and hold and press 3x at the
Press , „AOFF“ is displayed
Press or , the current setting will be
displayed.
Select the desired setting by pressing :
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
24 FOB-N-BA-e-1410
Use or to adopt selection, „AOFF“ is
displayed
Press , „CAP“ is displayed
Press again, „End“ is displayed
Using or the balance returns to
weighing mode. The setting is saved.
The auto-off function is only possible in battery operation. In mains
operation this functi o n i s turned off.
FOB-N-BA-e-1410 25
Remove load and set balance
necessary
Increase the load, if the error
contact your retailer
9 Error messages
Battery empty
Weighing range
exceeded
Zeroing range not
reached
Software error Contact your retailer
Insert new battery or connect
the balance to power supply
to zero with or , if
message remains, ple ase
10 Servicing, mai nt enanc e , disposal
10.1 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.
10.2 Servicing, maintenance
The appliance may only be opened by trained service technicians who are authorized
by KERN.
Before opening, disconnect from power supply.
10.3 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.
26 FOB-N-BA-e-1410
The displayed weight does
(Rechargeable) batteries are inserted incorrectly or
The displayed weight is
The weighing result is
11 Instant 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
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 plate 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.
FOB-N-BA-e-1410 27
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