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精密天平 KERN 442
KERN 442
Version 1.5
07/2003
GB
442-BA-e-0315
15/08/200713442-BA-e-0315 2
GB
KERN 442
Version 1.5 07/2003
Operating instructions
School balance
Tabel of contents:
1 Technical data__________________________________________________ 3
2 Declaration of conformty _________________________________________ 4
3 Fundamental information (general)_________________________________ 5
3.1 Intended use _____________________________________________________ 5
3.2 Inappropriate use _________________________________________________ 5
3.3 Guarantee _______________________________________________________ 5
3.4 Monitoring the test substances______________________________________ 6
4 Fundamental safety information ___________________________________ 6
4.1 Observe the information in the operating instructions___________________ 6
4.2 Staff training _____________________________________________________ 6
5 Transport and storage ___________________________________________ 6
5.1 Acceptance check ________________________________________________ 6
5.2 Packaging _______________________________________________________ 6
6 Unpacking, installation and commissioning _________________________ 7
6.1 Place of installation, place of use____________________________________ 7
6.2 Unpacking _______________________________________________________ 8
6.2.1 Installation ___________________________________________________________ 8
6.2.2 List of items supplied ___________________________________________________ 8
6.3 Mains supply_____________________________________________________ 8
6.4 Battery Operation _________________________________________________ 8
6.5 Initial start-up ____________________________________________________ 8
6.6 Adjustment ______________________________________________________ 9
6.7 Adjusting________________________________________________________ 9
7 Operation_____________________________________________________ 10
7.1 Overview of display ______________________________________________ 10
7.2 Operating elements ______________________________________________ 10
7.2.1 Weighing____________________________________________________________ 10
7.2.2 Taring ( key) _____________________________________________________ 10
7.2.3 Plus / Minus Weighings ________________________________________________ 11
7.2.4 Units _______________________________________________________________ 11
8 Maintenance, upkeep, disposal___________________________________ 12
8.1 Cleaning _______________________________________________________ 12
8.2 Maintenance, upkeep _____________________________________________ 12
8.3 Disposal________________________________________________________ 12
9 Troubleshooting _______________________________________________ 13
442-BA-e-0315 3
1 Technical data
KERN 442-43N 442-51N
Readout 0,1 g 1 g
Weighing range 400 g 4.000 g
Taring range (subtractive) 400 g 4.000 g
Reproducibility 0,1 g 1 g
Linearity ± 0,2 g ± 2 g
Adjusting weight (not included) Adjust-
ment tolerance class
200g (M2) 2000g (M2)
Stabilisation time (typical) 3 sec.
Units g / tol / tlt g / tol / tlt
Optimal temp. of operation + 10° C ... + 30° C
Humidity max. 80 % (non-condensing)
Casing (W x D x H) mm 145 x 185 x 55
Weighing pan mm ? 125
Weight kg (net) 0,5
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2 Declaration of conformty
KERN & Sohn GmbH
D-72322 Balingen-Frommern
Postfach 4052
: info@kern-sohn.de
0049-[0]7433- 9933-0
0049-[0]7433-9933-149
Internet: www.kern-sohn.de
Konformit?tserkl?rung
Declaration of conformity for apparatus with CE mark
Konformit?tserkl?rung für Ger?te mit CE-Zeichen
Déclaration de conformité pour appareils portant la marque CE
Declaración de conformidad para aparatos con disitintivo CE
Dichiarazione di cofnromitá per apparecchi contrassegnati con la marcatura CE
English We hereby declare that the product to which this declaration refers conforms with the fol-
lowing standards.
Deutsch Wir erkl?ren hiermit, da? das Produkt, auf das sich diese Erkl?rung bezieht, mit den nach-
stehenden Normen übereinstimmt.
Fran?ais Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la présente
déclaration, est conforme aux normes citées ci-après.
Espa?ol Manifestamos en la presente que el producto al que se refiere esta declaración est′′a de
acuerdo con las normas siguientes
Italiano Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si riferisce è confor-
me alle norme di seguito citate.
Electronic Scale: KERN 442_N
Mark applied EU Directive Standards
89/336EEC EMC EN 61000-6-3 : 2001
EN 61000-3-2 : 2000
EN 61000-3-3 : 1995+A1 : 2001
EN 61000-6-1 : 2001
Date: 01. July 2003 Signature:
Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, . +49-[0]7433/9933-0, +49-[0]7433/9933-149
442-BA-e-0315 5
3 Fundamental information (general)
3.1 Intended use
The balance you have acquired serves to determine the weighing value of the mate-
rial 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. The weighing value can be read off after a stable weighing value has been ob-
tained.
3.2 Inappropriate use
Do not use the 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“ in the balance. (Example: Slowly drain-
ing fluids from a container on the balance.)
Do not leave a permanent load on the weighing plate. This can damage the measur-
ing equipment.
Be sure to avoid impact shock and overloading the balance in excess of the pre-
scribed maximum load rating (max.), minus any possible tare weight that is already
present. This could cause damage to the balance.
Never operate the balance in hazardous locations. The series design is not explo-
sion-proof.
Structural alterations may not be made to the balance. This can lead to incorrect
weighing results, faults concerning safety regulations as well as to destruction of the
balance.
The balance may only be used in compliance with the described guidelines. Varying
areas of application/planned use must be approved by KERN in writing.
3.3 Guarantee
The guarantee is not valid following
- non-observation of our guidelines in the operating instructions
- use outside the described applications
- alteration to or opening of the device
- mechanical damage and damage caused by media, liquids
- natural wear and tear
- inappropriate erection or electric installation
- overloading of the measuring equipment
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3.4 Monitoring the test substances
The metrology features of the balance and any possible available adjusting weight
must be checked at regular intervals within the scope of quality assurance. For this
purpose, the answerable user must define a suitable interval as well as the nature
and scope of this check. 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. Test weights and balances can be adjusted quickly and at
a reasonable price in KERN’s accredited DKD calibration laboratory (return to na-
tional normal).
4 Fundamental safety information
4.1 Observe the information in the operating instructions
Please read the operating instructions carefully before erecting and commissioning,
even if you already have experience with KERN balances.
4.2 Staff training
The device may only be operated and looked after by trained members of staff.
5 Transport and storage
5.1 Acceptance check
Please check the packaging immediay upon delivery and the device during un-
packing for any visible signs of external damage.
5.2 Packaging
Please retain all parts of the original packaging in case it should be necessary to re-
turn items at any time.
Only the original packaging should be used for return consignments.
Before despatch, disconnect all attached cables and loose/movable parts.
Apply any intended transport security devices. Secure all parts, e.g. glass windshield,
weighing plate, power unit etc., to prevent slipping and damage.
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6 Unpacking, installation and commissioning
6.1 Place of installation, place of use
The balance is constructed in such a way that reliable weighing results can be
achieved under normal application conditions.
By selecting the correct location for your balance, you will be able to work quickly and
precisely.
Therefore please observe the following at the place of installation:
- 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. In-
admissible bedewing (condensation of air moisture on the device) can occur if
a cold device is taken into a significantly warmer environment. In this case,
please acclimatise the device for approx. 2 hours at room temperature after it
has been disconnected from the mains.
- Avoid static charging of the material to be weighed, weighing container and
windshield.
Major display deviations (incorrect weighing results) are possible if electromagnetic
fields occur as well as due to static charging, currents and instable power supply. It is
then necessary to change the location.
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6.2 Unpacking
Carefully remove the balance from its packaging, remove the plastic wrapping and
position the balance in its intended working location.
6.2.1 Installation
Install the balance in such a fashion that the weighing plate is absoluy horizonta
6.2.2 List of items supplied
Standard accessories:
? Balance
? Weighing pan
? Battery or mains adapter
? Operating instructions
6.3 Mains supply
Electric power supply is by means of the external mains supply circuit. The printed
voltage level must comply with the local voltage.
Only use original KERN mains supply circuits. The use of other makes is subject to
approval by Kern.
6.4 Battery Operation
Remove the battery cover from the bottom of the balance.
Connect 9 V block batteries.
Re-insert the battery cover.
Battery conservation through automatic power-off 1 - 2 minutes after the last weigh-
ing operation.
When the battery power is used up the display will show “LO“. Press the key and
change the batteries at once.
When the balance is not in use for a longer period of time remove batteries and keep
them separay. Leakage of battery liquid might damage the balance.
6.5 Initial start-up
A warm-up time of 1 minutes stabilises the measured values after switching on.
The accuracy of the balance depends on the local acceleration of the fall.
Please be sure to observe the information in the chapter on adjusting.
442-BA-e-0315 9
6.6 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 during the initial start-up, after change in lo-
cation and variation of surrounding temperature. It is also recommendable to adjust
the balance periodically during weighing operation in order to obtain exact measured
values.
6.7 Adjusting
Using a precision weight, the accuracy of the balance can be checked at any time
and adjusted.
Adjustment procedure:
Check that the surrounding conditions are stable.
A short warm-up time of about 1 minutes are recommended for stabilisation.
Press key approx. 3 seconds, "CAL 0" and then the exact weight of the adjusting
weight will appear the display.
Place the adjusting weight on the centre of the weighing plate.
Shortly after “CAL F“ appears, and then the balance switched off.
In case of an adjusting error or a wrong adjusting weight “ E" appears in the display,
and then turn off.
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7 Operation
7.1 Overview of display
7.2 Operating elements
7.2.1 Weighing
Switch the balance on by pressing the key.
The balance will show “8888“ for approx. 3 seconds and then change to “0“. Now it is
ready for use.
Important: If the display flashes or does not show “0“ press the key.
Only now (!) place object on the weighing pan. Make sure that the weighing object
does not stripe or touch the housing or base.
Now the weight will be indicated. After a successful stability control a small triangle
will appear on the far right at the bottom of the display.
If the object should be heavier than the weighing range allowance, the symbol “E“
(overload) will appear on the display.
7.2.2 Taring ( key)
Switch the balance on by pressing the key, then wait for the “0“ indication.
Place the tare cup on the weighing pan and press the key. Display again shows
“0“. Now the weight of the tare cup is memorised internally.
By pressing the key after a weighing procedure, “0“ will appear on the display
again.
The taring procedure can be repeated continuously, for instance when mixing several
components.
The limit is reached when the full weighing range is used.
After having removed the tare cup the total weight will appear as a negative value.
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7.2.3 Plus / Minus Weighings
For instance to control piece-weights, filling process control etc..
Switch the balance on by pressing the key, then wait until “0“ is indicated.
Place rated weight on the weighing pan and tare on “0“ by pressing the key.
Remove rated weight.
Place the objects on the weighing pan successively, the balance will show any devia-
tion from the rated weight.
According to the same procedure packages with the same weight, related to a rated
weight, can be produced.
Return to the weighing mode by pressing the key.
7.2.4 Units
Different foreign weighing units are integrated into the various balance models (de-
tails capture ? Technical data “).
Change the Units with the key.
Press an hold the key , few seconds later change the unit.
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8 Maintenance, upkeep, disposal
8.1 Cleaning
Please disconnect the device from the operating voltage before cleaning.
Only use a cloth dampened with mild suds and not aggressive cleaning agents (sol-
vents or similar). Please ensure that fluids are not able to get into the device and rub
off using a clean, soft cloth.
Loose sample residue/powder can be removed carefully using a brush or hand vac-
uum cleaner.
Remove any spilt material to be weighed immediay.
8.2 Maintenance, upkeep
The device may only be opened by trained service engineers authorised by KERN.
Disconnect from the mains supply before opening.
8.3 Disposal
The operating company shall dispose of the packaging and the device in compliance
with the valid national or regional law of the operating location.
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9 Troubleshooting
The balance should be switched off for a short time following an interruption in the
programme sequence and disconnected from the mains supply. It is then necessary
to repeat the weighing process from the beginning.
Help:
Interruption Possible cause
Weight display is not illuminated. ? 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 wrongly inserted, the
batteries are empty
? No batteries are attached
The weight display changes continu-
ally
? Draught/air movement
? Table/floor vibrations
? The weighing plate is in contact with for-
eign matter.
? Electromagnetic fields / static charging
(choose different location/switch off inter-
fering device if possible)
The weighing result is obviously in-
correct
? The balance display is not set to zero
? Adjustment is no longer correct.
? Great fluctuations in temperature.
? Electromagnetic fields / static charging
(choose different location/switch off inter-
fering device if possible)
Switch the balance off if other error messages should appear and then switch on
again. Contact the manufacturer if the error message does not disappear.