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
Compact balance
KERN FXN-N
Version 1.1
02/2015
GB
FXN-N-BA-e-1511
GB
KERN FXN-N
Version 1.1 02/2015
Operating manual
Compact balance
Contents
1 Technical data ............................................................................................ 3
1.1 Dimensions............................................................................................................................. 4
2 Appliance overview .................................................................................... 5
2.1 Overview of display ................................................................................................................ 5
2.1.1 Not verifiable models .............................................................................................................. 5
2.2 Keyboard overview ................................................................................................................. 6
3 Basic Information (General ) ...................................................................... 7
3.1 Proper use .............................................................................................................................. 7
3.2 Improper Use ......................................................................................................................... 7
3.3 Warranty ................................................................................................................................. 7
3.4 Monitoring of Test Resources ................................................................................................ 7
4 Basic Safety Precautions .......................................................................... 8
4.1 Pay attention to the instructions in the Operation Manual ..................................................... 8
4.2 Personnel training .................................................................................................................. 8
5 Transport and storage ............................................................................... 8
5.1 Testing upon acceptance ....................................................................................................... 8
5.2 Packaging / return transport ................................................................................................... 8
6 Unpacking, Setup and Commissioning .................................................... 9
6.1 Installation Site, Location of Use ............................................................................................ 9
6.2 Unpacking and placing ......................................................................................................... 10
6.2.1 Scope of delivery .................................................................................................................. 11
6.3 Battery operation .................................................................................................................. 11
6.4 Initial Commissioning ........................................................................................................... 13
7 Adjustment ............................................................................................... 13
7.1 Adjusting............................................................................................................................... 13
7.1.1 Adjustment ........................................................................................................................... 14
8 Operation .................................................................................................. 15
8.1 Weighing .............................................................................................................................. 15
8.2 Taring ................................................................................................................................... 15
9 The menu .................................................................................................. 17
9.1 Navigation in the menu ........................................................................................................ 17
9.2 Menu overview ..................................................................................................................... 18
9.3 Display background illum inatio n .......................................................................................... 19
9.4 Automatic switch-off function Auto-Off ................................................................................. 20
9.5 Checkweighing ..................................................................................................................... 21
9.6 Reset to factory setting ........................................................................................................ 23
9.7 Hold function ........................................................................................................................ 24
10 Error messages ........................................................................................ 25
11 Instant help ............................................................................................... 26
12 Servicing, maintenance, disposal ........................................................... 27
12.1 Cleaning ............................................................................................................................... 27
12.2 Servicing, maintenance ........................................................................................................ 27
12.3 Disposal................................................................................................................................ 27
2 FXN-N-BA-e-1511
1 Technical da ta
KERN
FXN
3K -3
FXN
6K -3
FXN
10K -3
FXN
30K -2
Weighing range (max) 3 kg 6 kg 15 kg 30 kg
Readability (d) 1 g 2 g 5 g 10 g
Reproducibility 1 g 2 g 5 g 10 g
Linearity 2 g 4 g 10 g 20 g
Recommended adjustment
weight, not added (class)
3 kg
(M3)
6 kg
(M3)
15 kg
(M3)
30 kg
(M3)
Stabilization time (typical) 2 sec.
Units g, kg, lb, oz,
Warm-up time 10 min.
Electric Supply Battery operation: 6 x 1.5V Size D
Auto-Off (rechargeable
battery)
15 min., 5 min., 3 min., off
Display type LCD, digit height 25 mm
Operating temperature 0° C …. + 40° C
Humidity of air 25 % - 95 % (non-condensing)
Dimensions of weighing
plate
(Stainless steel) (mm)
236 x 195
Casing dimensions 240 x 280 x 120
Dimensions, completely
assembled (mm)
240 x 280 x 120
Weight kg (net) 4.0
IP protection IP68 to DIN 60529
FXN-N-BA-e-1511 3
1.1 Dimensions
4 FXN-N-BA-e-1511
2 Appliance overview
2.1 Overview of display
2.1.1 Not verifiable models
Display Designation Description
Zeroing display Should the balance not display exactly zero
despite empty scale pan, press the
but
ton. The balance will be set to zero after a
short standby time.
Stability display Scales are in a steady state
Net weight display Net weight will be displayed
Capacity display
Battery
Full battery capacity
Display Weighing unit kg Displayed weight in kg
FXN-N-BA-e-1511 5
2.2 Keyboard overview
Button Designation Function
ON-button, zero button Switch-on, set to zero
OFF-button Switching Off
TARE button Tare balance
Unit button Switch-over units
Switch-over button
Switch-over gross weight / net
weight
6 FXN-N-BA-e-1511
3 Basic Information (General)
3.1 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.
3.2 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 faul ts and destruction of the balanc e.
The balance may only be used according to the described conditions. Other areas of
use must be released by KERN in writing.
3.3 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 or damage by media, liquids, natural wear and tear
The appliance is improperly set up or incorrectly electrically connected
The measuring system is overloaded
3.4 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.
FXN-N-BA-e-1511 7
4 Basic Safety Precautions
4.1 Pay att e nt ion to the instructions i n 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.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 Transport and storage
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possibl e v i si bl e damage.
5.2 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.
8 FXN-N-BA-e-1511
6 Unpacking, Setup and Commissioning
6.1 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 scales on a stable, even 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 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.
FXN-N-BA-e-1511 9
6.2 Unpacking and placing
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
Level balance with foot screws until the air bubble of
the water balance is in the prescribed circle.
Membrane for protection type IP68
Battery
compartment
Access to
membrane
Pressure compensation
10 FXN-N-BA-e-1511
6.2.1 Scope of delivery
Serial accessories:
Balance
Weighing pan
Operating manual
4 x 1.5V size D batteries
6.3 Battery operation
The operating time of the batteries with background illumination is 200 h, without
background illumination 250 h.
In menu you can activate the AUTO-OFF function, see chap. 9.3. According to menu
settings, the balance switches automatically off in order to spare the battery.
Insert rechargeable battery:
Open battery compartment.
Move both levers 90° to the left
FXN-N-BA-e-1511 11
Insert 4 x 1.5V size D batteries.
Close the battery compartment
cover.
Move both levers 90° to the right
Ensure that the cables are not
squeezed.
12 FXN-N-BA-e-1511
6.4 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).
For this warm-up period the scale must be connected to the power supply (batteries).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
7 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.
7.1 Adjusting
Carry out adjustment as close as possible to the maximum load of the scales )see
chap. 1 „Technical data“). The accuracy of the adjustment weight must correspond
approximately to or, if possible, be better than, the readability d of the balance.
Info about test weights can be found on t he In ter net at : http://www.kern-sohn.com
Procedure when adjusting:
Observe stable environmental conditions. A warming up time (see chapter 1) is
required for stabiliz at ion.
FXN-N-BA-e-1511 13
7.1.1 Adjustment
Operation
Start balance by pressing .
Press and at the same time in weighing mode.
01 FnC appears
Select 02 EC using button .
Co nfirm with button
The adjustment weight to be used appears.
Confirm by pressing the button (the displayed adjustment weight flashes)
Place the adjustment weight
Confirm by pressing the button
In case of successful adjustment the balance beeps 3 times.
Errors during adjustment or the use of an incorrect adjustment weight will result in an
error message. Repeat adjustment.
14 FXN-N-BA-e-1511
8 Operation
8.1 Weighing
Start balance by pressing .
The balance will carry out a self-test
As soon as the weight display shows „0.0“ and the triangle symbol above the
stability display appears, the scale is ready for weighing.
However, you can reset the weighing scale to zero by pressing
the button.
Switch off balance using .
The „0.0“ display disappears and the balance is switched off.
8.2 Taring
The tare weight of any preloads can be deducted by pressing a button so that the
actual weight of the weighed material is displayed in subsequent weighings.
Put on weighing receptacles and press .
The zero display appears, and above the reset symbol
the stability symbol and the net weight symbol the
triangle appears.
The weight of the container is now internally saved.
Place goods to be weighed in the weighing container.
The net weight of the goods to be weighed is displayed.
The weight of the weighing container will be displayed as a
minus number (=gross weight) after removing the weighing
container.
FXN-N-BA-e-1511 15
0.0
The tare weight is saved until it is deleted. Remove the load
from the balance and press . The zero display appears
and the triangle above the net weight symbol
vanishes.
Gross weight:
Press as long as the weighing container and the
object to be weighed are on the weighing plate.
Remove the object to be weighed as well as the weighing
container.
The gross weight is displayed as a negative value.
16 FXN-N-BA-e-1511
9 The menu
9.1 Navigation in the menu
Start balance by pressing
In weighing mode press the and the button at the same time.
01 FnC appears
Use the button to change between the main menu items.
Use the button to select the desired menu.
Enter the respective number for the required menu.
Use the button to change between the numeric values.
Use the button to increase the number.
Use the button to reduce the number.
Confirm by pressing the button
FXN-N-BA-e-1511 17
9.2 Menu overview
Menu item
Function
Access to the settings and functions of the balance.
Setting of background lighting
Setting Auto-off function
Hi / Lo / OK function. (Check weighing)
Reset to standard setting
Not documented
HOLD function
Not documented
External adjustment
18 FXN-N-BA-e-1511
9.3 Display background ill um ination
Start balance by
Press and at the same time in weighing mode.
01 FnC appears
Co nfirm with button
FnC 00 appears
Use the button to change between the numeric values.
Increase the number with button.
Decrease the number with button.
Now enter FnC 01
Co nfirm with button
bl on/ off appears (background illumination on/off)
Use button to carry out the required adjustment and confirm by button.
Switch balance off and on.
FXN-N-BA-e-1511 19
9.4 Automatic switch-off func t ion Auto-Off
Start balance by pressing
Press and at the same time in weighing mode.
01 FnC appears
Co nfirm with button
FnC 00 appears
Use the button to change between the numeric values.
Use the button to increase the number.
Use the button to reduce the number.
Now enter FnC 02
Confirm by pressing the button
Now select between the following values:
- 0: No Auto-off function
- 1: After one minute the balance switches off automatically.
- 2: After 2 minutes the balance switches off automatically.
- 9: After 9 minutes the balance switches off automatically.
Confirm by pressing the button
Now switch the balance off and on.
20 FXN-N-BA-e-1511
9.5 Checkweighing
In checkweighing an upper and a lower limit value can be established to ensure that
the weighed goods are exactly within the established tolerance limits.
Start balance by
Press and at the same time in weighing mode.
01 FnC appears
Co nfirm with button
FnC 00 appears
Use the button to change between the numeric values.
Increase the number with button.
Decrease the number with button.
Now enter FnC 03
Confirm by button
00000h appears flashing, enter upper limit value and confirm with
00000L appears, enter lower limit value and confirm with
01100b appears; here the acoustic signal is set (see tables below)
Enter required adjustment and confirm with
Switch balance off and again on and weigh the material.
FXN-N-BA-e-1511 21
0 0 0 0 0 b a b c
• a
1 = acoustic signal on
0 = acoustic signal off
• b
1 = acoustic signal at stable display
0 = acoustic signal at instable display
• c
1 = acoustic signal when the weighed material is between the upper and the
lower limit value
0 = acoustic signal when the weighed material is outside the both limit values
and
bigger than 10d
In the display the following symbols will appear:
1. Weighing material above upper limit value
2. Weighing material within both limit values
3. Weighing material below lower limit value
Delete limit values:
Set upper and lower value to 0
22 FXN-N-BA-e-1511
9.6 Reset to factory setting
This function resets all balance settings to factory settings.
Start balance by
Press and at the same time in weighing mode.
01 FnC appears
Co nfirm with button
FnC 00 appears
Use the button to change between the numeric values.
Increase the number with button.
Decrease the number with button.
Now enter FnC 04
Confirm by button
rEturn will appear
Confirm by button
Now switch the balance off and on, all settings are reset to the respective factory
setting.
FXN-N-BA-e-1511 23
9.7 Hold function
Start balance by
Press and at the same time in weighing mode.
01 FnC appears
Co nfirm with button
FnC 00 appears
Use the button to change between the numeric values.
Increase the number with button.
Decrease the number with button.
Now enter FnC 06
Co nfirm with button, hold 0 will appear flashing .
Enter required setting (see tables below)
Co nfirm with button
Switch balance off and on again.
0
Hold function switched off
1
Peak-Hold function
The maximum load value will be frozen and
displayed.
Delete value by pressing any button.
2
Hold 1
When the display is stable, the stable value is
displayed.
Delete value by pressing any button.
3
Hold 2
When the display is stable, the stable value is
displayed.
When the weighing plate is unloaded, the display
goes to zero, the Hold function will be left
automatically and the balance changes into the
weighing mode.
24 FXN-N-BA-e-1511
10 Error messages
Display Description Remedy
E1 Zero range exceeded Unload the balance
E2 Resetting range has not been
reached.
Check if the correct weighing
plate has been used.
oL Overload
Unload the balance and
adjust again
FXN-N-BA-e-1511 25
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.
Fault Possible cause
The displayed weight does not glow. The balance is not switched on.
Batteries are inserted incorrectly or empty
No batteries inserted.
The displayed weight is permanently
changing
Draught/air movement
Table/floor vibrations
Weighing pan has contact with other
objects.
Electromagnetic fiel ds / static char g i ng
(choose different location/switch off
interfering device if possible)
The weighing value is obviously
wrong
The display of the balance is not at zero
Adjustment is no longer correct.
Great fluctuations in temperature.
The balance is on an uneven surface.
Electromagnetic fiel ds / static char g i ng
(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.
26 FXN-N-BA-e-1511
12 Servicing, maintenance, disposal
12.1 Cleaning
Before cleaning, please remove batteries from the appliance
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.
12.2 Servici ng, m ai nt enance
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.
FXN-N-BA-e-1511 27
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