KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Operating instruction
Compact balance
KERN FOB
Version 1.8
01/2011
GB
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
FOB-BA-e-1118
GB
KERN FOB
Version 1.8 01/2011
Operation instruction
Compact balance
Tabel of contents:
1 Technical data................................................................................................ 4
1.1 Verifiable models...................................................................................................................... 4
1.2 Non verifiable models.............................................................................................................. 6
2 Fundamental information (general).............................................................. 8
2.1 Intended use ............................................................................................................................. 8
2.2 Inappropriate use ..................................................................................................................... 8
2.3 Guarantee..................................................................................................................................8
2.4 Monitoring the test substances.............................................................................................. 9
3 Fundamental safety information................................................................... 9
3.1 Observe the information in the operating instructions........................................................9
3.2 Staff training ............................................................................................................................. 9
4 Transport and storage................................................................................... 9
4.1 Acceptance check.................................................................................................................... 9
4.2 Packaging / return transport................................................................................................... 9
5 Unpacking, installation and commissioning............................................. 10
5.1 Place of installation, place of use......................................................................................... 10
5.2 Installation............................................................................................................................... 11
5.2.1 List of items supplied................................................................................................................11
5.3 Mains supply...........................................................................................................................11
5.4 Rechargeable battery operation (optional)..........................................................................11
5.5 Initial start-up..........................................................................................................................11
5.6 Adjustment..............................................................................................................................12
5.7 Adjusting................................................................................................................................. 12
5.7.1 Verifiable Models FOB 1K1M, FOB 2K2M, FOB 5K5M........................................................... 12
5.7.2 Verifiable Models FOB 6K2LM, FOB 15K5LM, FOB 30K10LM............................................... 12
5.7.3 Non-verifiable Models............................................................................................................... 13
5.7.4 Check software settings for verification of a balance............................................................... 13
5.7.5 Position adjust switch............................................................................................................... 15
5.8 Verification.............................................................................................................................. 15
5.8.1 Position of the „security marks“................................................................................................ 16
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6 Operation...................................................................................................... 17
6.1 Overview of display................................................................................................................ 17
6.1.1 Verifiable models......................................................................................................................17
6.1.2 Non-verifiable models............................................................................................................... 17
6.2 Weighing ................................................................................................................................. 18
6.3 Taring ( key) ..................................................................................................................... 18
6.4 Zeroing the balance ( ->verifiable balances)................................................................. 18
6.5 Plus/minus weighings............................................................................................................19
6.6 Net/gross weighings ..............................................................................................................19
6.7 Auto OFF mode....................................................................................................................... 19
6.8 Unit change............................................................................................................................. 19
7 Maintenance, upkeep, disposal.................................................................. 20
7.1 Cleaning .................................................................................................................................. 20
7.2 Maintenance, upkeep.............................................................................................................20
7.3 Disposal................................................................................................................................... 20
8 Troubleshooting........................................................................................... 21
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1 Technical data
1.1 Verifiable models
KERN FOB 1K1M FOB 2K2M FOB 5K5M
Readout (d) 1 g 2 g 5 g
Weighing range 1kg 2 kg 5 kg
Taring range (subtractive) 1kg 2 kg 5 kg
Adjustmentweight
(not included) (class)
Stabilization time
Operating temperature 0° C .... + 40° C
Air humidity 25 - 95 % (non-condensing)
Case (W x D x H) mm 175 x 235 x 60
Weighing plate (W x D)mm 175 x 160
Weight kg (net) 1,95
Rechargeable battery
(Option)
Mains adapter 15V/500mA
1000g (M1) 2000 g (M3) 5000 g (M3)
2 sec.
7.2 V; 1200 mAh;
Working life approx. 24 h / Loading time approx. 8h
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FOB-BA-e-1118
KERN FOB 6K2LM FOB 15K5LM FOB 30K10LM
Readout (d) 2 g 1 g 2 g
Weighing range (Max) 6 kg 15 kg 30 kg
Taring range (subtractive) 6 kg 15 kg 30 kg
Reproduzierbarkeit 2 g 5 g 10 g
Linearität ± 4 g ± 10 g ± 20 g
Adjustmentweight
(not included) (class)
Stabilization time
Operating temperature -10° C .... + 40° C
Air humidity 25- 95 % (non-condensing)
Case (W x D x H) mm 220 x 305 x 80
Weighing plate (W x D)mm 215 x 215
Weight kg (net) 3,3
Rechargeable battery
(Option)
Mains adapter 15V/500mA
5 kg (M3) 10 kg (M3) 20 kg (M3)
2 sec.
7.2 V; 1200 mAh;
Working life approx. 24 h / Loading time approx. 8h
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1.2 Non verifiable models
KERN
Readout (d) 0,5 g 1 g 2 g
Weighing range 1,5 kg 3 kg 6 kg
Taring range (subtractive) 1,5 kg 3 kg 6 kg
Reproducibility
Linearity
Adjustmentweight
(not included) (class)
Stabilization time
Operating temperature 0° C .... + 40° C
Air humidity 25 - 95 % (non-condensing)
Case (W x D x H) mm 175 x 235 x 60
FOB 1.5K0.5 FOB 3K1 FOB 6K2
0,5 g 1 g 2 g
± 1 g ± 2 g ± 4 g
1000 g (M2) 2.000 g (M3) 5.000 g (M2)
2 sec.
Weighing plate (W x D)mm 175 x 160
Weight kg (net) 1,95
Rechargeable battery
(Option)
Mains adapter 15V/500mA
Working life approx. 24 h / Loading time approx. 8h
7.2 V; 1200 mAh;
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FOB-BA-e-1118
KERN
Readout (d) 0,5 g 1 g 2 g
Weighing range 7,5 kg 15 kg 30 kg
Taring range (subtractive) 7,5 kg 15 kg 30 kg
Reproduzierbarkeit 0,5 g 1 g 2 g
Linearität ± 1,5 g ± 3 g ± 6 g
FOB 7.5K0.5L FOB 15K1L FOB 30K2L
Adjustmentweight
(not included) (class)
Stabilization time
Operating temperature 0° C .... + 40° C
Air humidity 25- 95 % (non-condensing)
Case (W x D x H) mm 220 x 305 x 80
Weighing plate (W x D)mm 215 x 215
Weight kg (net) 3,3
Rechargeable battery
(Option)
Mains adapter 15V/500mA
5 kg (M1) 10 kg (M1) 20 kg (M1)
2 sec.
7.2 V; 2000 mAh;
Working life approx. 30 h / Loading time approx. 14h
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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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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.kernsohn.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 / return transport
Ö Keep all parts of the original packaging for a possibly required return.
Ö Only use original packaging for returning.
Ö Prior to dispatch disconnect all cables and remove loose/mobile
parts.
Ö Reattach possibly supplied transport securing devices.
Ö Secure all parts such as glass wind screen, weighing platform, power
unit etc. against shifting 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.
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5.2 Installation
Use the foot screws to level the balance until the air bubble in the bubble level is in
the prescribed circle.
Notice : With non-verifiable models the air bubble is below the weighing plate.
5.2.1 List of items supplied Standard accessories:
- Balance
- Weighing pan
- Mains adapter (15V/500mA, inside negative, outside positive pol)
- Operating instructions
5.3 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.
5.4 Rechargeable battery operation (optional)
The balance may only be operated via an optional rechargeable battery.
If in the display „lobat“ appears, the rechargeable battery capacity is exhausted.
Battery will be re-loaded via mains adapter. To use the full performance of the rechargeable battery, the battery should be loaded at least 14 hrs. before its first use.
To save rechargeable battery life, the balance is equipped with an Auto OFF
function.
This switches off the balance after a time of approximately 120 seconds after the last
weighing or key operation.
5.5 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.
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5.6 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 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.
5.7 Adjusting
The accuracy of the balance can be checked and adjusted at any time with the help
of weights.
Please note:
In a calibrated balance this adjustment option is inactive.
(see chpt. 6.8 calibration).
Observe stable environment conditions. A short warming-up period of about 5 minutes for stabilization is useful.
5.7.1 Verifiable Models FOB 1K1M, FOB 2K2M, FOB 5K5M
Ö Switch the balance on using the
key.
Ö Press the adjust switch at the lower surface (see chap. 6.7.4) twice. A numeri-
cal value will appear on the display.
Ö Now press the key twice, “0” will appear on the display.
Ö Place adjusting weight (for nominal value see “Technical data” capture 1) in
the centre of the weighing plate and then press the
key. “CAL” will appear
on the display for approx. 2 seconds, followed by the nominal value of the adjusting weight.
Ö Remove the adjusting weight from the weighing plate to complete adjusting.
5.7.2 Verifiable Models FOB 6K2LM, FOB 15K5LM, FOB 30K10LM
Ö Switch the balance on using the
key.
Ö Press the adjustment switch on the bottom of the balance 4 times (see chap.
6.7.4), “CAL” is shown on the display.
Ö Now press the key, the word “Load” calibration weight will appear on the
display (for nominal value see “Tech. Data” on chapter 1),
Ö Place the weight on the middle of the weighing plate, then press the key.
Ö “CAL” will appear on the display for approx. 2 seconds, followed by the nomi-
nal value of the adjusting weight.
Ö Remove the adjusting weight from the weighing plate to complete adjusting.
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FOB-BA-e-1118
5.7.3 Non-verifiable Models FOB 1.5K0.5, FOB 3K1, FOB 6K2, FOB 7.5K0.5L, FOB 15K1L, FOB 30K2L
Ö Turn balance off and hold key, test procedure appears on the display, op-
erate the -key 3x times during this test procedure.
Ö Now let go of both keys. In the display appears “CAL”. Press key in dis-
play appears “Load”.
Ö Place the tare weight (nominal value, see “Techn. Specifications“ chapter 1) in
the centre of the weighing pan, then press the key . “CAL” will appear on
the display for approx. 2 seconds, followed by the nominal value of the adjusting weight.
Ö Remove the adjusting weight from the weighing plate to complete adjusting.
5.7.4 Check software settings for verification of a balance (only models FOB 1K1M, FOB 2K2M, FOB 5K5M):
For the adjustment function, the balance must be switched over to a service
mode. This service mode is activated by actuating the adjustment switch
twice.
In the service mode all parameters of the balance can be modified. There is a
special setting named „TRAD“.
The service parameters may not be modified, as this could damage the balance settings.
Especially the setting „TRAD“ is very important for a verification. This setting
activates and deactivates the verifiable settings of the balance.
Prior to a verification the setting „TRAD“ must be revised.
Press the
Press
graphic).
key and keep it pressed until „A_OFF“ appears on the display.
button repeatedly. The setting „Trad“ must not appear (see
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Overview of the possible software settings:
(there may be small differences referring to the model):
Navigation Menu
Press TARE 3sec
SET
Overload setting by
hardware option
CAPCAP
NET
GROSS
md-2md-1
OffOn
0.2g0.5g1g
0.5g1g2g
0
trAdtrAtEtrAnGrAvdivSA_OFF
End
OffOn
19200960048002400
2g5g
1.51.0
3.02.0 3.02.0
6.05.0
15.010.0
Off300240180120
1g
0.0020.0050.01
If the TRAD setting is OFF, this must be set to ON before a verification.
Reset into verifiable setting:
Press the
Press
Now press
Now press the
Then press subsequently
The balance is now ready for verification.
In order to check the settings, repeat the process.
key and keep it pressed until „A_OFF“ appears on the display.
key repeatedly until „TRAD“ appears.
key, in the display appears “OFF”.
key, „ON“ appears.
, , .
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FOB-BA-e-1118
5.7.5 Position adjust switch
Adjust switch at the lower surface
(depending on the model, on the right
or the left side)
5.8 Verification
General:
According to the EU guideline 90/384/EEC balances must be verified if they are to be
used as follows (legally regulated area):
a) For commercial transactions if the price of goods is determined by weighing
b) For the production of medines in pharmacies as well as for analyses in the
medical and pharmaceutical laboratory
c) For official purposes
d) For the production of finished packages
In case of doubt, please contact your local office of weights and measures.
Verification information
An EU qualification approval is available for those balances marked as appropriate
for verification in the technical data. In the event that the balance is applied in an
area subject to verification as described above, it must be verified and re-verified at
regular intervals.
Re-verification of a balance is carried out in compliance with the respective legal provisions of the states. The term of verification validity for balances in Germany, for
example, is normally 2 years.
The legal provisions of the country of use are to be observed.
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5.8.1 Position of the „security marks“
The adjustment switch is inside the balance. After the verification process the
balance is sealed on the marked positions.
The verification of the balance is not valid without the security mark.
Position of the „security marks“:
Security marks (depending on the model)
Balances that are subject to compulsory verification must be taken out of
operation if:
- The weighing result of the balance is outside the error limit. Therefore,
apply a known test weight (approx. 1/3 of the nominal load) to the balance at
regular intervals and compare with the display value.
- The reverification deadline has been exceeded.
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6 Operation
6.1 Overview of display
6.1.1 Verifiable models
FOB 1K1M, FOB 2K2M, FOB 5K5M:
FOB 6K2LM; FOB 15K5LM; FOB 30K10LM:
6.1.2 Non-verifiable models
FOB 1.5K0.5, FOB 3K1, FOB 6K2:
FOB 7.5K0.5L; FOB 15K1L; FOB 30K2L:
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6.2 Weighing
Switch the balance on by pressing the key.
The balance will show “88888“ for approx. 3 seconds and then change to “0“. Now
it is ready for use.
Important: If the display does not show “0“ press the or key
(details in capture 7.2.2 or 7.2.3).
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 „resting position“ 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 and a tone can be heard.
6.3 Taring ( key)
Switch the balance on by pressing the key, then wait for the “0“ indication.
Place the jiffy on the weighing pan and press the key. Display again shows
“0“. Now the weight of the jiffy 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 overlaid.
After having removed the jiffy the total weight will appear flashing as a minus indication.
6.4 Zeroing the balance (
Due to environmental influences, the balance may not display exactly "0.00“ even
when the weighing plate is empty. Nevertheless, you can zero the balance display
at any time to ensure that weighing actually starts at zero. Zeroing with some
weight on the balance can only be done within a certain range, depending on type.
If the balance does not allow zeroing with the weight on the plate, the weight is outof-range.
->verifiable balances)
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6.5 Plus/minus weighings
For example in order to check a single weight or for production control, etc.
Switch the balance on using the key and wait until “0” appears on the display.
Place the target weight on the weighing plate and tare to “0” using the key.
Remove the target weight.
Place the test samples on the weighing plate in succession. The respective target
weight deviation is displayed as ”+“(*) and ”-“ .
(A preceding sign does not appear in the case of a ”+“ reading).
The same procedure can also be used to produce packages of the same weight in
relation to a target weight.
Press the key to return to weighing mode.
6.6 Net/gross weighings
This is useful when weighing in merchandise to be weighed in a tare container.
To control the total weight, the value of the tare container may be retrieved. This
way it is possible to control to what extent the loading area of the balance is utilized. (gross, i. e. incl. weight of tare container).
Example:
Tare container (>2% of max) on weighing pan.
Tare by key , the display shows "0".
Place merchandize to be weighed on weighing pan, use the key to change between gross weight (incl. tare container) and weight value of tare load.
Notice:
The tared load must be > 2% of weighing area (max.).
Values < 2% of max are not shown when using this function.
6.7 Auto OFF mode
For battery indulgence the balance is equipped with an auto-off function.
This automatically switches the balance off 120 seconds after the last weighing
procedure or after a key has been operated.
6.8 Unit change
(only at models FOB 1.5K0.5; FOB 3K1; FOB 6K2)
Switch the balance on by pressing the key, then wait for the “0” indication.
By pressing the key, the units set in the balance can be selected between the
different units.
The following units are available:
Display
Conversion factor
1 g =
Gramm * g 1.
Pound lb 0.0022046226
Unze oz 0.035273962
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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 (solvents 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.
• The recharchable battery pack is empty.
• 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.
FOB-BA-e-1118
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Electromagnetic fields / static charging
(choose different location/switch off interfering device if possible)
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