KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating Manual
Compact balance
KERN FWN
Version 1.1
04/2007
GB
FWN-BA-e-0711
GB
KERN FWN
Version 1.1 04/2007
Operating Manual
Compact balance
Table of Contents
1 Technical data__________________________________________________ 3
2 Declarations of conformity _______________________________________ 5
2.1 Electronic Compact Balance (verifiable)_________________________________ 6
3 Appliance overview _____________________________________________ 7
4 Description of parts _____________________________________________ 8
5 Basic Information (General)_______________________________________ 9
5.1 Proper use _______________________________________________________ 9
5.2 Improper Use _____________________________________________________ 9
5.3 Warranty_________________________________________________________ 9
5.4 Monitoring of Test Resources________________________________________ 10
6 Basic Safety Precautions________________________________________ 10
6.1 Pay attention to the instructions in the Operation Manual __________________ 10
6.2 Personnel training_________________________________________________ 10
7 Transport and storage __________________________________________ 10
7.1 Testing upon acceptance ___________________________________________ 10
7.2 Packaging_______________________________________________________ 10
8 Unpacking, Setup and Commissioning ____________________________ 11
8.1 Installation Site, Location of Use _____________________________________ 11
8.2 Unpacking_______________________________________________________ 12
8.3 Setup __________________________________________________________ 12
8.3.1 Scope of delivery _____________________________________________________ 12
8.4 Battery operation _________________________________________________ 12
8.5 Mains adapter (optional)____________________________________________ 13
8.6 Initial Commissioning ______________________________________________ 13
8.7 Adjustment ______________________________________________________ 14
8.7.1 Procedure when adjusting __________________________________________ 14
8.8 Verification ______________________________________________________ 15
8.9 Adjustment switch and seal _________________________________________ 16
9 Weighing _____________________________________________________ 17
9.1 Simple weighing __________________________________________________ 17
9.2 Taring __________________________________________________________ 17
10 Service, maintenance, disposal_________________________________ 18
10.1 Cleaning ________________________________________________________ 18
10.2 Service, maintenance______________________________________________ 18
10.3 Disposal ________________________________________________________ 18
11 Instant help _________________________________________________ 19
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1 Technical data
(non verifiable models)
KERN FWN 300-1IP FWN 1K0.5IP
Readability (d) 0.1 g 0.5 g
Weighing range (max) 300 g 1,000 g
Reproducibility 0.1 g 0.5 g
Linearity 0.2 g 1 g
Recommended adjusting
weight (not supplied) (class)
200 g + 100g (M2) 1000 g (M3)
Stabilization time (typical) 2 sec.
Operating temperature -10° C .... + 40° C
Warming up time (operating
temperature)
10 min.
Humidity of air
10 % - 95 %
(not condensing)
Weighing Units g
Housing (B x D x H) (mm) 170 x 220 x 63 170 x 220 x 63
Weighing plate, stainless
steel (mm)
128 x 128
Weight kg (net) 0.9
Battery operation 6 x AA 1.5 V
IP protection type
(only in battery operation)
IP65
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Verifiable model
KERN FWN 3K1IPM
Readability (d) 1 g
Weighing range (max) 3,000 g
Minimum load (Min) 20 g
Verification value (e) 1 g
Verification class III
Reproducibility 1 g
Linearity 2 g
Recommended adjusting
weight (not supplied) (class)
2000 g + 1000 g (M2)
Stabilization time (typical) 2 sec.
Operating temperature -10° C .... + 40° C
Warm-up time 10 min.
Humidity of air
10 % - 95 %
(not condensing)
Weighing Units g
Housing (B x D x H) (mm) 174 x 220 x 63
Weighing plate, stainless
steel (mm)
174 x 137
Weight kg (net) 1
Battery operation 6 x AA 1.5 V
IP protection type
(only in battery operation)
IP65
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2 Declarations of conformity
Declaration of conformity
Declaration of conformity for apparatus with CE mark
Konformitätserklärung für Geräte mit CE-Zeichen
Déclaration de conformité pour appareils portant la marque CE
Declaración de conformidad para aparatos con marca CE
Dichiarazione di conformità per apparecchi contrassegnati con la marcatura CE
English
We hereby declare that the product to which this declaration refers conforms to the
following standards.
Deutsch
Wir erklären hiermit, daß das Produkt, auf das sich diese Erklärung bezieht, mit den
nachstehenden Normen übereinstimmt.
Français
Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la présente
déclaration, est conforme aux normes citées ci-après.
Español
Manifestamos en la presente que el producto al que se refiere esta declaración está de
acuerdo con las normas siguientes
Italiano
Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si riferisce è
conforme alle norme di seguito citate.
Electronic Scale: KERN FWN
Mark applied EU Directive Standards
89/336/EEC
EMC
73/23/EEC
LVD
EN 61326
EN 60950
Date: 10.01.2007 Signature:
Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0,Fax +49-[0]7433/9933-149
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2.1 Electronic Compact Balance (verifiable)
Declarations of conformity
Declaration of conformity for apparatus with CE mark
Konformitätserklärung für Geräte mit CE-Zeichen
Déclaration de conformité pour appareils portant la marque CE
Declaración de conformidad para aparatos con marca CE
Dichiarazione di conformità per apparecchi contrassegnati con la marcatura CE
English
We hereby declare that the product to which this declaration refers conforms to the
following standards.
This declaration is only valid with the certificate of conformity by a notified body.
Deutsch
Wir erklären hiermit, daß das Produkt, auf das sich diese Erklärung bezieht, mit den
nachstehenden Normen übereinstimmt.
Diese Erklärung gilt nur in Verbindung mit der Konformitätsbescheinigung einer
benannten Stelle.
Français
Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la présente
déclaration, est conforme aux normes citées ci-après.
Cette déclaration est valide seulement avec un certificat de conformité dún
organisme notifié.
Español
Manifestamos en la presente que el producto al que se refiere esta declaración está de
acuerdo con las normas siguientes
Esta declaratión solo será válida acompañada del certificado de conformidad de
conformidad de la parte nominal.
Italiano
Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si riferisce è
conforme alle norme di seguito citate.
Questa dichiarazione sarà valida solo se accompagnata dal certificato di conformità
della parte nominale.
Electronic Scale: KERN FWN
Model: FWN 3K1IPM
EU Directive Standards
EC-type-approval
certificate no.
Issued by
90/384/EEC EN 45501 T7090
NMI
Date: 10.01.2007 Signature:
Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-07433/9933-0,Fax +49-074433/9933-149
FWN-BA-e-0711
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3 Appliance overview
Model FWN 3K1IPM (verifiable)
Models FWN 300-1IP, FWN 1K0.5IP (not verifiable)
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4 Description of parts
Display
ON/OFF key Weighing
plate
Bubble level
Taste RE-ZERO UNIT button
(hidden)
Four leveling feet
Models FWN 300-1IP, FWN 1K0.5IP
STABLE display
Indicates that the
weighed value is
stable.
Weighing unit, g
ZERO display
Indicates when the
balance is stable.
Model FWN 3K1IP
M
NET display
Shows when the net weight
appears. (tara function is
used)
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5 Basic Information (General)
5.1 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.
5.2 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“ in the balance. (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 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.
5.3 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
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5.4 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.
6 Basic Safety Precautions
6.1 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.
6.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
7 Tr ansport and storage
7.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
7.2 Packaging
Keep all parts of the original packaging in case you need to return the appliance.
Only use original packaging for returning.
Before sending, disconnect all connected cables and loose/movable parts.
Secure all parts, e.g. weighing plate, mains adapter etc., to prevent slipping and
damage.
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8 Unpacking, Setup and Commissioning
8.1 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 charging of the material to be weighed, weighing container and
windshield.
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.
Special protection against moisture:
The FWN in battery operation fulfills the requirements of the DIN EN 60529 for the
protection type IP65.
The FWN is suitable for a short-time contact with liquids. For cleaning use a wet
cloth. The FWN is sealed against dust in battery operation.
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8.2 Unpacking
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
8.3 Setup
Level balance with foot screws until the air bubble of the water balance is in the
prescribed circle.
Information: The non verifiable models bear the air bubble level under the weighing
plate.
8.3.1 Scope of delivery
Serial accessories:
KERN FWN
• Balance
• Weighing plate
• Batteries (6 x AA 1.5 V)
• Operating Manual
8.4 Battery operation
When changing the batteries do not press to heavy on the weighing plate. An
excessive pressure can damage the balance. Remove the battery cover and insert
six batteries (6 x AA 1.5 V) in the battery compartment, take special care of the
polarity plus and minus.
In order to save the battery, the balance switches automatically off after 5 minutes
without weighing.
Rubber cap
Battery compartment
cover
Connection of mains
adapter
(Batteries not
included in scope
of deliver
y)
Battery compartment
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8.5 Mains adapter (optional)
Power is supplied via the external mains adapter.
The stated voltage value of the mains adapter must be the same as the local voltage.
Only use original KERN mains adapter. Using other makes requires consent by
KERN.
Caution
When using a mains adapter, the balance does not more fulfill the requirements
according to IP65.
Power is supplied via the external 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.
Cable
Connector socket
8.6 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,
accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
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8.7 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
(only if the balance has not already been adjusted to the location in the factory). This
adjustment process must be carried out during the initial start-up, after change in
location and variation of surrounding 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 weight (see
chap. 1 "Technical data"). Adjustment is also possible with the weights of other
nominal values (see following table), but not the optimum for measuring technique.
Model Recommended
Adjustment weight
Other measurement-technically not
optimal nominal values for
adjustment
FWN 300-1IP
200 g + 100 g (M2) 200 g
FWN 1K0.5IP
1000 g (M3) 500 g
FWN 3K1IPM
2000 g + 1000 g (M2) 2000 g
Info about adjustment weights can be found on the Internet at: http://www.kern-
sohn.com
8.7.1 Procedure when adjusting
Check that the surrounding conditions are stable.
A short warm-up time (see chap. 1) is recommended for stabilisation.
Ö Model FWN 3K1IPM (verifiable)
Attention:
In the verified balances the adjustment is not possible (see chapter 8.9).
• Turn on balance by pressing the [ON/OFF] key
• Press adjustment switch (see chapter 8.9). CAL is displayed.
• Press the [TARE] button. CAL 0 is displayed..
• Wait for the stabilisation display and press then the [TARE] button. CAL F is
displayed.
• For an exact adjustment put the weight in the center of the weighing plate.
Wait for the stabilisation display and press then the [TARE] button.
• The display shows END. Remove adjustment weight and the balance returns
automatically into the weighing mode.
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Ö Model FWN 300-1IP, FWN 1K0.5IP (not verifiable)
• Press the [ON/OFF] key in order to switch off the power supply.
• Press as well the [TARE] button and the [UNITS] button and press at the
same time the [ON/OFF] key. CAL is displayed.
Position of the UNITS key to call-up the adjustment function (not visible)
UNITS key
• Press the [TARE] button. CAL 0 is displayed.
• Wait for the stabilisation display and press then the [TARE] button. CAL F is
displayed.
• For an exact calibration put the weight in the center of the weighing plate. Wait
for the stabilisation display and press then the [TARE] button.
• The display shows END. Remove adjustment weight and the balance returns
automatically into the weighing mode.
8.8 Verification
General introduction:
According to EU directive 90/384/EEC 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.
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Verification instructions
An EU type approval exists for balances described in their technical data as
verifyable. If a balance is used where obligation to verify exists as described above, it
must officially verified and re-verified in 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!
8.9 Adjustment sw itch and seal
After verification the balance is sealed at the indicated positions.
Verification of the balance is invalid without the "seal".
Position of the seal and the adjustment switch:
Seal of approval
Adjustment switch
(remove cover)
Balances with obligation to verify must be taken out of operation if:
- The weighing result of the balance is outside the error limit. Therefore,
in regular intervals load balance with known test weight (ca. 1/3 of the max.
load) and compare with displayed value.
- The reverification deadline has been exceeded.
.
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9 Weighing
Take care of the automatic switch-off function. When this equipment is switched
ON and the stabilisation display is active, after approx. 5 minutes the automatic
switch-off function will be activated. In order to deactivate this function, press
[ON/OFF] and [TARE] at the same time. P-XX is displayed, and the balance returns
to the weighing mode.
9.1 Simple weighing
• Turn on balance by pressing the [ON/OFF] key
• Your balance is ready to weigh as soon as the “0.000" display appears.
• Put on items to be weighed, weighed value is displayed.
• To turn off the balance press the ON/OFF key
9.2 Taring
The dead weight of any weighing container may be tared away by pressing a button,
so that the following weighings show the net weight of the goods to be weighed.
• Turn on balance by pressing the [ON/OFF] key
• Your balance is ready to weigh as soon as the “0.000" display appears.
• Put on container, weighed value is displayed.
• To start the taring process press the TARE key. The weight of the container is
now saved internally.
• Place the goods to be weighed into the tare container.
Read the weight of the goods on the display.
The taring process can be repeated any number of times, e.g. when adding several
components for a mixture (adding).
The limit is reached when the whole weighing range is exhausted.
After removing the taring container the total weight is displayed as negative display.
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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.
Note for equipments with protection type as per DIN EN 60529(IPxx) see chapter 7.1
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.
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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
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.
• The batteries are empty
The displayed weight is permanently
changing
• Draught/air movement
• Table/floor vibrations
• The weighing plate is in contact with
foreign matter.
• Electromagnetic fields / static charging
(choose different location/switch off
interfering device if possible)
The weighing value is obviously
• The display of the balance is not at zero
wrong
• Adjustment is no longer correct.
• Great fluctuations in temperature.
•
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.
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