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 instructions
Compact balance
KERN FOB-S
Version 1.1
07/2013
GB
FOB-S-BA-e-1311
GB
KERN FOB-S
Version 1.1 07/2013
Operating instructions
Compact balance
Contents
1 Technical data ................................................................................................ 3
2 Basic Information (General) .......................................................................... 4
2.1 Proper use .................................................................................................................................. 4
2.2 Improper Use .............................................................................................................................. 4
2.3 Warranty ..................................................................................................................................... 4
2.4 Monitoring of Test Resources..................................................................................................... 5
3 Basic Safety Precautions .............................................................................. 5
3.1 Pay attention to the instructions in the Operation Manual .......................................................... 5
3.2 Personnel training ....................................................................................................................... 5
4 Transport and storage ................................................................................... 5
4.1 Testing upon acceptance ........................................................................................................... 5
4.2 Packaging / Return transport ...................................................................................................... 5
5 Unpacking, Setup and Commissioning ....................................................... 6
5.1 Installation Site, Location of Use ................................................................................................ 6
5.2 Unpacking ................................................................................................................................... 6
5.2.1 Placing ........................................................................................................................................ 7
5.2.2 Scope of delivery ........................................................................................................................ 7
5.3 Mains connection (optional)........................................................................................................ 7
5.4 Battery operation ........................................................................................................................ 7
5.5 Initial Commissioning .................................................................................................................. 8
5.6 Adjustment .................................................................................................................................. 8
5.7 Adjustment .................................................................................................................................. 8
6 Operating elements ..................................................................................... 10
6.1 Keyboard overview ................................................................................................................... 10
6.2 Overview of display .................................................................................................................. 10
7 Operation ...................................................................................................... 11
7.1 Simple weighing ....................................................................................................................... 11
7.2 Taring ........................................................................................................................................ 11
7.3 Weighing units switch-over ....................................................................................................... 12
8 The menu ...................................................................................................... 12
8.1 Call up menu ............................................................................................................................ 12
8.2 Navigation in the menu ............................................................................................................. 12
8.3 Menu overview ......................................................................................................................... 12
8.4 Menu settings ........................................................................................................................... 13
8.4.1 Setting weighing units ............................................................................................................... 13
8.4.2 Automatic switch-off function „AUTO OFF“ in stand-by mode ............................................... 14
9 Error messages ............................................................................................ 16
10 Service, maintenance, disposal .................................................................. 16
10.1 Cleaning.................................................................................................................................... 16
10.2 Service, maintenance ............................................................................................................... 16
10.3 Disposal .................................................................................................................................... 16
11 Instant help ................................................................................................... 17
FOB-S-BA-e-1311 2
KERN
FOB 500-1S
FOB 5K1S
Readability (d)
0.1 g
1 g
Weighing range (max)
500 g
5,000 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)
2,000 g /
5,000 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 (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
Secondary voltage powerpack
9 V / 100 mA
1 Technical data
3 FOB-S-BA-e-1311
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 balcance”, 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.
2.2 Improper Use
Do not use balance for dynamic weighings. 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 faults and destruction of the balance.
The balance may only be used according to the described conditions. Other areas of
use must be released by KERN in writing.
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
FOB-S-BA-e-1311 4
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.
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.
3.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
4 Transport 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
5 FOB-S-BA-e-1311
5 Unpacking, Setup and Commissioning
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 (condensation of air humidity on the appliance)
may occur if a cold appliance is taken to a considerably warmer environment.
In this case, acclimatize the disconnected appliance for ca. 2 hours at room
temperature.
Avoid static charge of goods to be weighed or weighing container.
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.
FOB-S-BA-e-1311 6
Balance
Weighing pan
Mains adapter (optional)
Protective working cover
Operating instructions
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:
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 adapters. Using other makes requires consent by
KERN.
5.4 Battery operation
Remove battery cover at the lower side of the casing. Insert 9 V block. Reinsert the
battery cover.
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
replace the batteries immediately.
If the balance is not used for a longer time, take out the battery and store it
separately. Leaking battery liquid could damage the balance.
7 FOB-S-BA-e-1311
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 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.
5.7 Adjustment
The adjustment should be made with the recommended adjustment weights (see
chap. 1 "Technical data").
FOB-S-BA-e-1311 8
Balance display
Operation
Start balance by pressing
The balance carries out an autotest and changes
then into the weighing mode, the zero display „0.0“
appears
(example)
(example)
Press 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 the first adjustment weight from the
weighing plate and place the second adjustment
weight in the middle of the weighing plate.
Adjustment occurs automatically after standstill
control.
„donE“ will be shortly displayed. Then the value of
the second adjustment weight will be displayed.
Adjustment process has been finished successfully.
The balance is now in weighing mode.
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.
9 FOB-S-BA-e-1311
Key
Description
Pressed once and released
[ON/OFF]
Turn on/off
[TARE]
Taring
In menu:
Passing through menu
items from top to
bottom
[UNIT]
Weighing units
switching over
Invoke adjustment
Passing through menu
items from left to right
Display
Description
g, lb, oz, dwt, ozt
Display weighing units
Stability display
6 Operating elements
6.1 Keyboard overview
Buttons specification:
6.2 Overview of display
FOB-S-BA-e-1311 10
Balance display
Operation
Start balance by pressing .
The balance will carry out a self-test.
„Wait for 0.0“ display
(example)
Should the balance not display exactly „0.0“ despite
empty weighing pan, press the button.
The balance returns to „0.0“
Place goods to be weighed on balance.
Wait until the stability display appears.
Read weighing result.
To switch off the balance press shortly .
Balance display
Operation
(example)
Deposit weighing vessel.
The weight of the container is displayed.
Press , the zero display appears.
The weight of the container is now internally saved.
(example)
Place goods to be weighed in the weighing
container.
The net weight of the goods to be weighed is
displayed.
7 Operation
7.1 Simple weighing
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.
11 FOB-S-BA-e-1311
Key
Direction in the
menu
Description
Passing through menu items from top to bottom
Confirm selection
Passing through menu items from left to right
1
Model FOB 500-1S
2
Model FOB 5K1S
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 (see chap. 8.4.1).
In weighing mode, use to change between the set units.
8 The menu
8.1 Call up menu
The menu is invoked by pressing the button for approx. 3 seconds in weighing
mode.
8.2 Navigation in the menu
8.3 Menu overview
*Preset values may only be modified by trained and specialized personnel.
FOB-S-BA-e-1311 12
Balance display
Operation
In weighing mode press button for approx. 3
seconds.
„SEt“, followed by „Unit“ is displayed
Press again, the weighing unit „g“ is displayed
(example)
Use to change to the desired unit
Press , „OFF“ will be shown.
(example)
Use to change to „On“
(example)
Press , the selected unit will be diplayed thus
being set.
Press repeatedly until „Unit“ is displayed
8.4 Menu settings
8.4.1 Setting weighing units
13 FOB-S-BA-e-1311
Press , „A.Off“ will be shown
Press , „CAP.“ is displayed
Press , „End“ is displayed
Use to return to weighing mode
(example)
Use to change between the set units
In order to switch off the units display, proceed as described above and
set the selected unit to „Off“.
Balance display
Operation
In weighing mode press button for approx. 3
seconds.
„SEt“, followed by „Unit“ is displayed
Press , „AOFF“ is displayed
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-BA-e-1311 14
Press , the current setting will be displayed.
Use 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
Use to take over the selected items, „AOFF“ is
displayed
Press , „CAP.“ is displayed
Press again , „End“ is displayed
Press , the balance will return into weighing
mode. The setting is saved.
The auto-off function is only possible in battery operation. In mains
operation this function is turned off.
15 FOB-S-BA-e-1311
Battery empty
Insert new battery or connect
the balance to power supply
Weighing range exceeded
Remove load and if necessary
press to reset balance to
zero
Zeroing range not reached
Increase the load, if the error
message remains, please
contact your retailer
Software error
Contact your retailer
9 Error messages
10 Service, maintenance, disposal
10.1 Cleaning
Before cleaning, please disconnect the appliance from the operating voltage.
Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth
dampened with mild soap suds. Ensure that no liquid penetrates into the device and
wipe with a dry soft cloth.
Loose residue sample/powder can be removed carefully with a brush or manual
vacuum cleaner.
Spilled weighing goods must be removed immediately.
10.2 Service, 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.
FOB-S-BA-e-1311 16
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/faulty).
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)
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:
Should other error messages occur, switch balance off and then on again. If the error
message remains inform manufacturer.
17 FOB-S-BA-e-1311
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