KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Operating instruction
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Platform scale
KERN ECB
Version 1.4
08/2011
GB
ECB-BA-e-1114
GB
KERN ECB
Version 1.4 08/2011
Operating instruction
Platform scale
Tabel of contents:
1 Technical data................................................................................................ 3
2 Fundamental information (general).............................................................. 4
2.1 Intended use ............................................................................................................................. 4
2.2 Inappropriate use ..................................................................................................................... 4
2.3 Guarantee..................................................................................................................................4
2.4 Monitoring the test substances.............................................................................................. 5
3 Fundamental safety information................................................................... 5
3.1 Observe the information in the operating instructions........................................................5
3.2 Staff training ............................................................................................................................. 5
4 Transport and storage................................................................................... 5
4.1 Acceptance check.................................................................................................................... 5
4.2 Packaging.................................................................................................................................. 5
5 Unpacking, installation and commissioning............................................... 6
5.1 Place of installation, place of use........................................................................................... 6
5.2 Unpacking the Balance............................................................................................................6
5.2.1 Installation .................................................................................................................................. 6
5.2.2 Package volume.........................................................................................................................7
5.3 Mains supply/ Battery operation............................................................................................. 7
5.3.1 Mains supply............................................................................................................................... 7
5.3.2 Battery operation........................................................................................................................ 7
5.4 Initial start-up............................................................................................................................9
5.5 Adjustment................................................................................................................................9
5.6 Adjusting................................................................................................................................... 9
6 Operation...................................................................................................... 10
6.1 Weighing ................................................................................................................................. 10
6.2 Taring....................................................................................................................................... 10
6.3 Rear illuminated display........................................................................................................11
6.4 Dosage und Zero-tracking.....................................................................................................12
6.5 AUTO-OFF function................................................................................................................ 13
6.6 Reset function......................................................................................................................... 14
7 Maintenance, upkeep, disposal.................................................................. 15
7.1 Cleaning .................................................................................................................................. 15
7.2 Maintenance, upkeep.............................................................................................................15
7.3 Disposal................................................................................................................................... 15
8 Troubleshooting........................................................................................... 16
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ECB-BA-e-1114
1 Technical data
KERN ECB10K5 ECB20K10 ECB50K20
Readout (d) 5 g 10 g 20 g
Weighing range (max) 10 kg 20 kg 50 kg
Taring range (subtractive) 10 kg 20 kg 50 kg
Reproducibility
Linearity
Recommended adjustment
weight, not added (class)
Stabilisation time (typical) 2 sec.
Operating temperature + 5°C ….+ 35°C
Humidity max. 80 % (non-condensing)
Size (W x D x H) mm 320 x 300 x 60
Weighing plate mm 320 x 260
Weight kg (net) 1,7
5 g 10 g 20 g
± 10 g ± 20 g ± 0,4 kg
5 kg
(M3)
10 kg
(M3)
20 kg
(M3)
ECB-BA-e-1114
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2 Fundamental information (general)
2.1 Intended use
The balance you have acquired serves to determine the weighing value of the 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. The weighing value can be read off after a stable weighing value has been obtained.
2.2 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 draining fluids from a container on the balance.)
Do not leave a permanent load on the weighing plate. This can damage the measuring equipment.
Be sure to avoid impact shock and overloading the balance in excess of the prescribed 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 explosion-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.
2.3 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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ECB-BA-e-1114
2.4 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 national normal).
3 Fundamental safety information
3.1 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.
3.2 Staff training
The device may only be operated and looked after by trained members of staff.
4 Transport and storage
4.1 Acceptance check
Please check the packaging immediately upon delivery and the device during unpacking for any visible signs of external damage.
4.2 Packaging
Please retain all parts of the original packaging in case it should be necessary to return items at any time.
Only the original packaging should be used for return consignments.
Before despatch, disconnect all attached cables and loose/movable parts.
Secure all parts, e.g. power unit etc., to prevent slipping and damage.
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5 Unpacking, installation and commissioning
5.1 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 and instable power supply. It is then necessary to change the location.
5.2 Unpacking the Balance
Carefully remove the balance from the packaging and out of the plastic covering,
then place the balance on the assigned position.
5.2.1 Installation
Install the balance in such a fashion that the weighing plate is absolutely horizontal.
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ECB-BA-e-1114
5.2.2 Package volume
Serial fittings:
KERN ECB
• Balance
• Operating manual
• Power adaptor
5.3 Mains supply/ Battery operation
5.3.1 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.
Mains adapter output voltage: 9V DC (polarity: inner terminal is negative)
5.3.2 Battery operation
Open the battery cover on the underside of the balance. Insert 6 x 1.5volt (AA) batteries.
Replace the battery cover. To preserve battery life, the balance switches off
automatically after 3 minutes if no weighing has taken place.
For battery operation the balance has an automatic switchoff function which can be
activated and deactivated in the menu (chap. 6.5).
When the battery power is used up the display will show “LO“. Press the ON/OFF
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 separately. Leakage of battery liquid might damage the balance.
The optionally supplied battery is charged with the supplied power supply.
The battery has a service life of c. 100 hours.
The charging period for total charge is c. 10 hours.
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7
Rechargeable Battery Installation:
1. Remove battery cover
2. Slide spacer to left or right, lever down on corner, then remove the
spacer
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3. Insert and connect rechargeable battery
ECB-BA-e-1114
5.4 Initial start-up
A warm-up time of 5 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.
5.5 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. It is also recommendable to adjust
the balance periodically during weighing operation in order to obtain exact measured
values.
5.6 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 5 minutes is recommended for stabilisation.
Operation Display
Turn balance on using ON/OFF button
Hold down TARE button for 3 seconds
The weight value for adjusting the scales will appear in the
display.
Place the required adjustment weight on the weighing plat-
form (see section 1, “Technical data“)
Shortly afterwards, this will appear:
If adjustment has not worked correctly or if the wrong ad-
justment weight was used then this will be displayed:
In this case switch the power off and on and repeat the
adjustment process.
Remove the weight from the weighing platform and the
display will automatically return to normal weighing mode.
Adjustment has been successfully completed.
0,00
10,00
F
E
0,00
ECB-BA-e-1114
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6 Operation
6.1 Weighing
• The balance is switched on by pressing the "ON/OFF" key.
• The balance performs auto-diagnostics (for 2 s) and then displays "0.00".
• If the weighing object is heavier than the weighing range the display indicates
"E" (=Overload).
• The balance is switched off by pressing the "ON/OFF" key once.
6.2 Taring
• Switch the balance with the “ON/OFF” key on and wait until display appears
as "0.00". Position the tare load and press the “TARE” key.
• The balance display becomes "0.00".
• The item to be weighed can now be placed in the tare container and the
weight can be read off.
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ECB-BA-e-1114
6.3 Rear illuminated display
To choose the backlight mode, please follow the below instruction for the setting:
Ö When the balance is switched off, press the TARE -key and keep it pressed
Ö Do not release the TARE -key. Press also the ON/OFF -key and keep it pressed
Ö Keep the ON/OFF -key pressed, however release the TARE -key
Ö Press TARE -key anew
Ö Keep both keys pressed until in the display “bl” appears
Ö Release both keys. The balance is situated in the menu.
Ö Press the ON/OFF -key until „bl“ appears
Ö Confirm with the TARE key
Ö Press the ON/OFF key to switch among the backlight modes:
Display Mode Function
„bl“ ON
„bl“ OFF
„bl“ CH
Ö Confirm with the TARE key. Wait until the balance automatically returns to weigh-
ing mode
Backlight on
Backlight off
Backlight switches automatically
off 10 sec after stable indication
Contrasting display which can
also be read in the dark.
Save the battery
Save the battery
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6.4 Dosage und Zero-tracking
When the Auto-Zero-function is activated, any slight changes of the zero readout are
automatically tared.
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.)
Having dosages with slight changes of weight it is recommended to deactivate this
function.
With switched off Zero-Tracking the display however is more unstably.
Activate/deactivate Zero-Tracking
Ö When the balance is switched off, press the TARE -key and keep it pressed
Ö Do not release the TARE -key. Press also the ON/OFF -key and keep it pressed
Ö Keep the ON/OFF -key pressed, however release the TARE -key
Ö Press TARE -key anew
Ö Keep both keys pressed until in the display “bl” appears
Ö Release both keys. The balance is situated in the menu.
Ö Press the ON/OFF -key until „tr“ appears
Ö Confirm with the TARE key
Ö Press the ON/OFF key to switch among the settings:
Display Mode
„tr“ ON
„tr“ OFF
Auto-Zero on
Auto-Zero off
Ö Confirm with the TARE key. Wait until the balance automatically returns to weigh-
ing mode
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ECB-BA-e-1114
6.5 AUTO-OFF function
For battery operation the balance has an automatic switch off function which can be
activated and deactivated in the menu.
Please follow the below instruction for the setting:
Ö When the balance is switched off, press the TARE -key and keep it pressed
Ö Do not release the TARE -key. Press also the ON/OFF -key and keep it pressed
Ö Keep the ON/OFF -key pressed, however release the TARE -key
Ö Press TARE -key anew
Ö Keep both keys pressed until in the display “bl” appears
Ö Release both keys. The balance is situated in the menu.
Ö Press the ON/OFF -key until „AF“ appears
Ö Confirm with the TARE key
Ö Press the ON/OFF key to switch among the settings:
Display Mode
„AF“ ON
„AF“ OFF
Ö Confirm with the TARE key. Wait until the balance automatically returns to weigh-
ing mode
Battery conservation through automatic
power-off 3 minutes after ending a
weighing operation.
AUTO-OFF function deactivated.
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6.6 Reset function
Factory setting reset.
Ö When the balance is switched off, press the TARE -key and keep it pressed
Ö Do not release the TARE -key. Press also the ON/OFF -key and keep it pressed
Ö Keep the ON/OFF -key pressed, however release the TARE -key
Ö Press TARE -key anew
Ö Keep both keys pressed until in the display “bl” appears
Ö Release both keys. The balance is situated in the menu.
Ö Press the ON/OFF -key until „rSt“ appears
Ö Confirm with the TARE key
Ö Press the ON/OFF key to switch among the settings:
Display Mode
„rst“ YES
„rst“ NO
Ö Confirm with the TARE key. Wait until the balance automatically returns to weigh-
ing mode
Factory setting reset
No factory setting reset
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ECB-BA-e-1114
7 Maintenance, upkeep, disposal
7.1 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 vacuum cleaner.
Remove any spilt material to be weighed immediately.
7.2 Maintenance, upkeep
The device may only be opened by trained service engineers authorised by KERN.
Disconnect from the mains supply before opening.
7.3 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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8 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 weight display changes continually
The weighing result is obviously incorrect
• The balance is not switched on.
• The mains supply connection has been
interrupted (mains cable not plugged
in/faulty).
• Power supply interrupted. .
• 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 interfering device if possible)
• The balance display is not set to zero
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.
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• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Electromagnetic fields / static charging
(choose different location/switch off interfering device if possible)
ECB-BA-e-1114
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