KERN FXN User manual

Operating manual
Compact balance
KERN FXN
Version 1.5
2018-08
GB
FXN-BA-e-1815

2 FXN-BA-e-1815
GB
KERN FXN
Version 1.52018-08
Operating manual Compact balance
Contents
1Technical data ............................................................................................ 3
1.1 Dimensions............................................................................................................................. 5
2Appliance overview.................................................................................... 6
2.1 Overview of display ................................................................................................................ 6
2.2 Keyboard overview................................................................................................................. 7
3Basic Information (General) ...................................................................... 8
3.1 Proper use.............................................................................................................................. 8
3.2 Improper Use ......................................................................................................................... 8
3.3 Warranty................................................................................................................................. 8
3.4 Monitoring of Test Resources ................................................................................................ 8
4Basic Safety Precautions .......................................................................... 9
4.1 Pay attention to the instructions in the Operation Manual ..................................................... 9
4.2 Personnel training .................................................................................................................. 9
5Transport and storage ............................................................................... 9
5.1 Testing upon acceptance ....................................................................................................... 9
5.2 Packaging / return transport................................................................................................... 9
6Unpacking, Setup and Commissioning.................................................. 10
6.1 Installation Site, Location of Use.......................................................................................... 10
6.2 Unpacking and placing......................................................................................................... 11
6.2.1 Scope of delivery.................................................................................................................. 12
6.3 Battery operation.................................................................................................................. 12
6.4 Initial Commissioning ........................................................................................................... 14
7Adjustment ............................................................................................... 14
7.1 Adjusting............................................................................................................................... 14
7.1.1 Adjustment ........................................................................................................................... 15
7.1.2 Verification............................................................................................................................ 16
8Operation .................................................................................................. 18
8.1 Weighing .............................................................................................................................. 18
8.2 Taring ................................................................................................................................... 18
8.3 Parts counting ...................................................................................................................... 19
9The menu .................................................................................................. 21
9.1 Navigation in the menu ........................................................................................................ 21
9.2 Menu overview ..................................................................................................................... 22
9.3 Display background illumination .......................................................................................... 23
9.4 Automatic switch-off function Auto-Off................................................................................. 24
9.5 Checkweighing ..................................................................................................................... 25
9.6 Reset to factory setting ........................................................................................................ 27
9.7 Hold function ........................................................................................................................ 28
10 Error messages ........................................................................................ 29
11 Instant help ............................................................................................... 29
12 Servicing, maintenance, disposal........................................................... 30
12.1 Cleaning ............................................................................................................................... 30
12.2 Servicing, maintenance........................................................................................................ 30
12.3 Disposal................................................................................................................................ 30
13 Declaration of Conformity ....................................................................... 30

FXN-BA-e-1815 3
1 Technical data
KERN FXN
3K-4N
FXN
6K-3N
FXN
10K-3N
FXN
30K-3N
Weighing range (max) 3 kg 6 kg 15 kg 30 kg
Readability (d) 0.5 g 1 g 5 g 5 g
Reproducibility 0.5 g 1 g 5 g 5 g
Linearity 5 g 2 g 10 g 10 g
Recommended adjustment
weight, not added (class)
3 kg
(M1)
6 kg
(M1)
15 kg
(M3)
30 kg
(M1)
Stabilization time (typical) 2 sec.
Units g, kg, lb, oz,
Warm-up time 10 min.
Electric Supply Battery operation: 4 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) 3.1
IP protection IP68 to DIN 60529

4 FXN-BA-e-1815
KERN FXN
3K-3M
FXN
6K-3M
FXN
10K-3M
FXN
30K-2M
Weighing range (max) 3 kg 6 kg 15 kg 30 kg
Readability (d) 1 g 2 g 5 g 10 g
Minimum load (Min) 20 g 40 g 100 g 200 g
Verification value (e) 1 g 2 g 5 g 10 g
Verification class III III III III
Reproducibility 1 g 2 g 5 g 10 g
Linearity 1 g 2 g 5 g 10 g
Recommended adjustment
weight, not added (class)
3 kg
(M1)
6 kg
(M1)
15 kg
(M1)
30 kg
(M1)
Stabilization time (typical) 2 sec.
Units g, kg, lb, oz,
Warm-up time 10 min.
Electric Supply Battery operation: 4 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 -10° 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) 3.1
IP protection IP68 to DIN 60529

FXN-BA-e-1815 5
1.1 Dimensions

6 FXN-BA-e-1815
2 Appliance overview
2.1 Overview of display
Display Designation Description
Zeroing display Should the balance not display exactly zero
despite empty scale pan, press the
button. 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-BA-e-1815 7
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

8 FXN-BA-e-1815
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 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.
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. The
test weights and balances can be quickly and cheaply calibrated in the KERN
calibration laboratory accredited by DKD (Deutsche Kalibrierdienst) (with reference to
the national standard).

FXN-BA-e-1815 9
4 Basic Safety Precautions
4.1 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.
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 possible visible 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.

10 FXN-BA-e-1815
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-BA-e-1815 11
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.
1. Access point to membrane
2. Pressure compensation (Goretex filter)
3. Battery compartment

12 FXN-BA-e-1815
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:
Example not verifiable models:
Open battery compartment.
Move both levers 90° to the left
Membrane for protection type IP68

FXN-BA-e-1815 13
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.

14 FXN-BA-e-1815
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 coordinated - in compliance with the underlying physical
weighing principle - to the existing acceleration due to gravity at its place of location
(unless the balance has been pre-adjusted in the target location).
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 the Internet at: http://www.kern-sohn.com
Procedure when adjusting:
Observe stable environmental conditions. A warming up time (see chapter 1) is
required for stabilization.

FXN-BA-e-1815 15
7.1.1 Adjustment
Operation
Turn off the balance and set the adjustment switch located on the bottom.
Start the balance by pressing .
Press and at the same time in weighing mode.
The 01 FnC indication appears.
Select 02 EC by pressing .
Confirm by pressing , the device displays CAL 00, the first digit is blinking.
Enter CAL 01 by pressing
, go to the next digit and increase it by 1 using the
key.
Confirm by pressing , the device displays the value of adjustment weight,
e.g. „015.0000 kg“.
Change the value by pressing and , and confirm by pressing ; or
Apply the displayed value and confirm by pressing .
For a while, the device will display CENTER
. During that time, the balance
determines the zero point.
Then it will display a blinking value of adjustment weight, as previously selected.
Place the appropriate adjustment weight and confirm by pressing .
You will hear a sound signal, and the indication will start blinking.
Remove the adjustment weight and press any key to complete the adjustment.
The device will display the CAL 01 indication. Enter CAL 00
and confirm by
pressing .
The balance will display the 02 CAL indication.
Swith over the adjustment switch.
Restart the balance. It will display the zero value. The balance is now in the
weighing mode.
In case of any adjustment error or using an incorrect adjustment weight, the balance
will display an error message. Repeat the adjustment.

16 FXN-BA-e-1815
7.1.2 Verification
General information:
Pursuant to Directive 2009/23/EC, balances must be verified if used in the following
manners (scope specified by law):
a) for trade, if the product price is determined by weighing;
b) for production of medicines in pahrmacies, and for analyses conducted at
medical and pharmaceutical laboratories;
c) for official purposes;
d) for production of ready-made packagings.
In case of doubts, refer to the local Measurement Authority.
Guidelines for verification:
Balances marked in the technical specifications as suitable for verification have type-
approval certificates pplicable in the European Union. If the balance is to be used in
one of the above-defined areas requiring verification, it must be verified and such
verification must be renewed on a regular basis. The balance shall be re-verified in
accordance with the national regulations. In Germany, the validity period of balance
verification is usually 2 years. You must comply with the legal provisions applicable in
the country of use!
Verification of a balance without seals is invalid.
For balances with type-approval certificates, the seals indicate that the
balance may be opened and maintained only by trained and authorised
professional personnel. Destruction oft he seals causes invalidity oft he
verification. You must comply with the national laws and regulations. In
Germany, re-verification is required.

FXN-BA-e-1815 17
Position of seals and adjustment switch
1. Wire of a verification seal
2. Seals
3. Adjustment switch

18 FXN-BA-e-1815
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-BA-e-1815 19
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.
8.3 Parts counting
Before the balance can count parts, it must know the average part weight (i.e.
reference). Proceed by putting on a certain number of the parts to be counted. The
balance determines the total weight and divides it by the number of parts, the so-
called reference quantity. Counting is then carried out on the basis of the calculated
average piece weight.
As a rule:
The higher the reference quantity the higher the counting exactness.

In weighing mode press until the message
< 0 Pcs >appears
Use to set the desired reference quantity (e.g. 100),
selectable 10, 20, 50, 100 or 200

Place as many parts to be counted (e.g. 100 items) as
required by the reference number of parts.
Acknowledge with . The weighing scales calculate the
reference weight. The current quantity (such as 100 items)
will be displayed.
0.0
0.0

20 FXN-BA-e-1815
Remove reference weight. The balance is from now in parts
counting mode counting all units on the weighing plate.
Back to Weighing mode by pressing the button
repeatedly.
By switching the scale off and then on again the scale starts in the parts
counting mode. The current reference weight remains stored until the
reference is set again or the power supply is interrupted.
The counting function is not active, if the weight is under 20d or if below
the minimum piece weight (< 0.2 D) is reached.
Automatic reference optimization
In order to improve the counting exactness, the reference can be
optimised by adding more pieces. At every reference optimisation, the
reference weight is calculated anew. As the additional pieces increase the
base for the calculation, the reference also becomes more exact.
While the automatic reference optimization function <FnC 07> is available
the number of placed parts are 5 pieces more than the reference and less
than double the reference, then balance will automatically re-sample the
unit weight.
Indicator [

] atop the symbol shows:
Number of parts placed on balance too small
Piece below minimum weight of piece
0.0