KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating instructions
Price calculating balance
KERN RFB
Version 1.1
01/2012
GB
RFB-BA-e-1211
RFB-BA-e-1211
2
GB
KERN RFB
Version 1.1 01/2012
Operating instructions
Price calculating balance
Contents
1 Technical data ................................................................................................ 4
2 Device overview ............................................................................................. 5
2.1 Dimensions ................................................................................................................................. 5
2.2 Overview of display ..................................................................................................................... 6
2.2.1 Display weight ............................................................................................................................. 7
2.2.2 Display basic price ...................................................................................................................... 7
2.2.3 Display sale price ........................................................................................................................ 7
2.3 Keyboard overview ..................................................................................................................... 8
3 Basic Information (General) ................................................................ .......... 9
3.1 Proper use .................................................................................................................................. 9
3.2 Improper Use .............................................................................................................................. 9
3.3 Warranty ................................................................................................................................... 10
3.4 Monitoring of Test Resources ................................................................................................... 10
4 Basic Safety Precautions ............................................................................ 10
4.1 Pay attention to the instructions in the Operation Manual ........................................................ 10
4.2 Personnel training ..................................................................................................................... 10
5 Transport and storage ................................................................................. 11
5.1 Testing upon acceptance ......................................................................................................... 11
5.2 Packaging / return transport ..................................................................................................... 11
6 Unpacking, Setup and Commissioning ..................................................... 11
6.1 Installation Site, Location of Use .............................................................................................. 11
6.2 Unpacking ................................................................................................................................. 12
6.2.1 Placing ...................................................................................................................................... 13
6.2.2 Pressure compensation screw: ................................................................................................ 14
6.3 Scope of delivery ...................................................................................................................... 14
6.4 Mains connection ...................................................................................................................... 14
6.5 Battery power supply ................................................................................................................ 15
6.5.1 Rechargeable battery installation ............................................................................................. 15
6.5.2 Mains connection during rechargeable battery operation ......................................................... 17
6.6 Initial Commissioning ................................................................................................................ 17
6.7 Type of protection IP- 65 .......................................................................................................... 17
6.8 Adjustment ................................................................................................................................ 18
6.9 Verification ................................................................................................................................ 20
6.9.1 Position of seals and adjusting switch ...................................................................................... 22
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7 Operation ...................................................................................................... 23
7.1 Switch on/off and set zero ........................................................................................................ 23
7.2 Simple weighing ........................................................................................................................ 24
7.3 Weighing with taring ................................................................................................................. 25
7.4 Weighing units switch-over ....................................................................................................... 26
7.5 Background illumination ........................................................................................................... 27
7.6 Auto-Off function ....................................................................................................................... 28
7.7 Weighing with price determination ............................................................................................ 30
7.7.1 Manual input of a basic price .................................................................................................... 30
7.7.2 Saving and calling up a basic price .......................................................................................... 31
7.8 Determining the price per number of items .............................................................................. 33
8 The menu ...................................................................................................... 34
8.1 Navigation in the menu ............................................................................................................. 34
8.2 Menu overview .......................................................................................................................... 35
9 Error messages ............................................................................................ 36
10 Service, maintenance, disposal .................................................................. 37
10.1 Clean ........................................................................................................................................ 37
10.2 Service, maintenance ............................................................................................................... 37
10.3 Disposal .................................................................................................................................... 37
11 Instant help ................................................................................................... 38
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1 Technical data
KERN
RFB 3K1IPM
RFB 6K2IPM
RFB 15K5IPM
Readability (d)
1 g
2 g
5 g
Weighing range (max)
3 kg
6 kg
15 kg
Minimum load
20 g
40 g
100 g
Verification value (e)
1 g
2 g
5 g
Verification class
III
III
III
Reproducibility
1 g
2 g
5 g
Linearity
± 1 g
± 2 g
± 5 g
Stabilization time
2 sec.
2 sec.
2 sec.
Recommended adjusting
weight (not supplied)
2 kg (M1)
1 kg (M1)
5 kg (F2)
1 kg (F2)
5 kg (M1)
10 kg (M1)
Net weight (kg)
4,2
Dimensions, completely
assembled
(W x D x H) [mm]
286 x 316 x 126
Weighing plate, stainless
steel
200 x 260 mm
Heating time (operating
temperature)
10 min
Weighing unit
kg, g
Permissible ambient
condition
-10° C to 40° C
Allowable air humidity
0% - 80% (non-condensing)
Electric Supply
Input Voltage: 220V-240V AC 50Hz
Secondary voltage powerpack: 12V, 500 mA
Rechargeable battery
6V; 3.2Ah
Operating time – background lighting ON approx. 40 hrs.
Operating time – background lighting OFF approx. 60 hrs.
Loading time approx. 12 hrs.
Auto-Off (rechargeable
battery)
adjustable 3, 5, 10, 30 min, off
Display
LCD, digit height 15mm
IP protection
IP 65
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2 Device overview
1 Verification wire
2
Battery compartment
3
Connection of mains adapter
4
Pressure compensation
screw
2.1 Dimensions
Membrane for degree of
protection IP67
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2.2 Overview of display
Operator display balance:
Weight
Basic price
Sales price
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Secondary display on customer side:
Weight
Basic price
Sales price
2.2.1 Display weight
Here, the weight of your goods is displayed.
The arrows above the symbols show:
Stability display
Zeroing display
Net weight
Battery very low
2.2.2 Display basic price
Here, enter your basic price in €/kg or €/100 g via keyboard. The basic price can be
switched to €/kg or €/100 g.
The arrows above the symbols show:
€/100 g
Saved basic price in €/100 g
€/kg
Saved basic price in €/kg
2.2.3 Display sale price
Here the sales price is displayed in Euro [€].
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2.3 Keyboard overview
Selection
Function
in weighing mode
in menu
Turn on/off
-
Zeroing key:
Balance zeroing
Invoke function background
illumination (press button long
time)
Exit menu and return to
weighing mode
Exit submenu and return to
main menu item
Price calculation per number of
items
Invoke function Auto-Off
-
Taring key:
Tare balance
Store pretare-value
Access to menu
Choose selected parameter
In functions background
illumination and Auto-OFF:
change between the single
settings
change between the single
parameters
-
Numeric keys:
Entering the basic price/PLU
Entering the pretare value
-
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Selection
Function
in weighing mode
in menu
Saving and invoking the four
PLU values
-
Switch-over buttons €/kg or
€/100g
-
Deleting key
-
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
plate. 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 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“. (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.
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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. In KERN's accredited DKD calibration laboratory test weights and balances may
be calibrated (return to the national standard) fast and at moderate cost.
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.
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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.
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 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;
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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 charge of goods to be weighed or weighing container.
Do not operate in areas with hazard of explosive material or in potentially
explosive atmospheres due to materials such as gasses, steams, mists or
dusts.
Keep away chemicals (such as liquids or gasses), which could attack and
damage the balance inside or from outside.
Keep IP protection of the device.
If electro-magnetic fields or static charge occur, or if the power supply is
unstable major deviations on the display (incorrect weighing results) are
possible. In that case, the location must be changed.
6.2 Unpacking
Remove device and accessories carefully from packaging, remove packaging
material and place device at the planned work place. Verify that there has been no
damage and that all packing items are present.
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6.2.1 Placing
Assembly description:
Place the balance on a firm, level
surface
7 Place the support of the weighing
plate on the balance
Insert shim
Using the hexagonal wrench of scope
of delivery, fasten the screw carefully
so that the weighing system will not
be damaged
Place weighing plate
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
Check levelling regularly.
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6.2.2 Pressure compensation screw:
On the lower side of the balance there is a pressure compensation screw [1] which
has to be opened for the weighing process. Fasten the screw before cleaning
the balance.
6.3 Scope of delivery
Serial accessories:
Balance
Weighing plate
Carrier weighing plate
Power cable
Hexagonal socket wrench
Shim
Fastening screw of the carrier weighing plate
Rechargeable battery
Operating instructions
6.4 Mains connection
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage.
Only use KERN original mains adapter. Using other makes requires consent by
KERN.
1
Connection of power
pack on the lower side of
the balance
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6.5 Battery power supply
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 12 hours. For this purpose the balance needs not to be
switched on.
The operating time of the rechargeable battery with background illumination is about
40h. without background illumination approx. 60 hrs. Charging time until complete
recharging is approx. 12h
AUTO-OFF function can be selected after 3, 5, 15, 30 min. to save the rechargeable
battery.
If an arrow appears on the weight display above the battery symbol , the
capacity of the rechargeable battery will soon be exhausted. Connect the power
adapter as soon as possible to change the battery.
The LED display beside the piece number window informs you during charging
about the charging status of the rechargeable battery.
red: Battery is almost discharged
green: Battery is completely discharged
yellow: Charging storage battery
6.5.1 Rechargeable battery installation
Remove any adherent moisture from the balance
Move both levers 90° to the left
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Remove the rechargeable battery cover
Connecting the rechargeable battery
Watch the colours:
Red on red !
Black on black!
Insert the rechargeable battery in a manner that it
cannot slip (fasten with a rubber mat)
Ensure that the cables are not squeezed.
Close the rechargeable battery cover
Move both levers 90° to the right
Avoid excess pressure as this may damage the balance,
particularly as it is supported by the weighing plate.
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6.5.2 Mains connection during rechargeable battery operation
During the rechargeable battery operation ensure that the mains
connection is covered with a rubber cap.
Only by this the type of protection IP65 is ensured.
6.6 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).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter 6.8 Adjustment.
6.7 Type of protection IP- 65
Suitable for a short-time contact with liquids. For cleaning use a wet cloth. Dustproof.
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6.8 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 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.
Verified models:
The adjustment is locked for verified balances.
To disable the access lock, destroy the seal and actuate the adjustment
switch. Position of the adjustment switch see chap. 6.9.1
Attention:
After destruction of the seal the balance must be re-verified by an
authorised agency and a new verification wire/seal mark fitted before it can
be reused for applications subject to verification.
Operation
Display
Switch on balance
While the balance carries out
a self test, press .
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Use the numeric keys to
enter password „0000“
Actuate adjustment switch on
the lower side of the balance
(see chap.6.9.1)
Then press
Press adjustment switch
again
Press
Ensure that there are no objects
on the weighing plate.
Press
.
The required adjustment weight is displayed:
(Example)
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Wait for the appearance of
the triangle over the
stability display , then
place the adjustment weight
Confirm with
The adjustment process is
started.
The display changes to „F0
CAL“
Now the process of adjustment
is completed.
Remove adjustment weight
from weighing plate
Using the balance
returns into the weighing
mode
In case of an adjustment error or incorrect adjusting weight the display will show an
error message; repeat adjustment process.
6.9 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 purpose.
d) For manufacturing final packages.
In cases of doubt, please contact your local trade in standard.
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Verification notes:
An EU type approval exists for balances described in their technical data as
verifiable. If a balance is used where obligation to verify exists as described above, it
must be verified and re-verified at 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!
Verification of the balance is invalid without the seal.
The seal marks attached on verified balances point out that the balance may
only be opened and serviced by trained and authorised specialist staff. If the
seal mark is destroyed, verification looses its validity. Please observe all
national laws and legal regulations. In Germany a re-verification will be
necessary.
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6.9.1 Position of seals and adjusting switch
After a verification the balance is sealed at the indicated positions.
1
Self-destroying seal mark
2
Cover of adjustment switch
3
Adjustment switch
4
Self-destroying seal mark
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7 Operation
7.1 Switch on/off and set zero
Operation
Display
Switch on balance
Press
The balance will carry out a selftest
As soon as the weight display shows "0" in all
the display windows your balance is ready to
weigh.
Zeroing
If the balance does not display „0“,
press
The zero display and the triangle over the
symbol will appear.
Switch off the balance
Press
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7.2 Simple weighing
Operation
Display
Place goods onto weighing
plate
Read weighing result
If weighing values are stable the triangle will be
displayed above the symbol
If the goods are heavier than the weighing range, the display will show "QL"
(=Overload), and a whistle is sounded.
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7.3 Weighing with 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.
Operation
Display
Place empty tare container
on the weighing plate. The
total weight of the container
is displayed.
Reset display to "0":
Press
The weight of the container is now internally
saved. The triangle will appear above the
symbol and the symbol.
Place the goods to be
weighed into the tare
container.
The weight of the weighing goods is displayed.
The taring process can be repeated any number of times, e.g. when adding several
components for a mixture (adding).
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7.4 Weighing units switch-over
Operation
Display
Press for approx.
3 sec.
If „kg“ is selected, press the button, the
display changes to the weighing unit „100g“
If „100g“ is selected, press the button, the
display changes to the weighing unit kg
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7.5 Background illumination
The balance has three background illumination settings:
Auto
Automatic background illumination on when weighing pate is loaded
On
Switch-on background illumination
Off
Background illumination switched-off
Operation
Display
Press for approx. 3
sec.
Use to switch between
the three settings
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Use to take over the
selected setting, the balance
changes into the weighing
mode
An other possibility to adjust the background illumination are the buttons
(Off)
(On) and
(Auto).
7.6 Auto-Off function
For rechargeable battery operation the balance has an automatic switch-off function
which can be activated or deactivated. The following settings are possible:
Of 0
Automatic switch off deactivated
Of 3
Automatic switch off after 3 min
Of 5
Automatic switch off after 5 min
Of 10
Automatic switch off after 10 min
Of 30
Automatic switch off after 30 min
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Operation
Display
Start balance by pressing
While the balance carries out
a self test, press .
Use to switch between
the single settings
Use to take over the
selected setting, the balance
changes into the weighing
mode
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7.7 Weighing with price determination
As soon as the goods to be weighed are placed on the balance and the basic price
has been set the price is calculated automatically and displayed in the provided field.
7.7.1 Manual input of a basic price
Operation
Display
If you are using a weighing
container, tare
If the balance does not display „0.00“, shift the
decimal digit (see chap. 8.2 „F3 PdESC mode)
Place goods to be weighed
on balance.
Enter basic price via
number keys; sales price is
automatically calculated
The displayed basic price can be deleted by .
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7.7.2 Saving and calling up a basic price
The balance is able to save up to 4 PLU values as basic price.
The PLU value may be saved as €/kg or €/100 g.
The buttons from to are used to save /call up the four PLU values.
Storing a basic price via the PLU buttons:
Operation
Display
Enter your basic price
via keyboard, either in
€/kg or in €/100 g
Press ~ until a
signal sounds, then
release
Now the basic price is
stored under PLU 1
For the other 3 PLUs
proceed in the same way
To modify values saved at a certain PLU position, repeat procedure.
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Invoking a basic price via the PLU buttons:
Operation
Display
Place the material which
will be weighed
Press ~ button
„LOAd PLU 1~4“ will
appear shortly before the
balance displays
the weight,
the basic price and
the sales price of the
weighed material
Deleting a PLU value
To delete a stored PLU value as basic price, enter 0.00 and after that press the
respective PLU button ~ until a signal sounds, then release.
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7.8 Determining the price per number of items
To calculate total price, enter basic price / number of items (pocket calculator
function). Weighing of goods is not required.
Operation
Display
Enter basic price (1
item) via the numeric
buttons to
(Example)
Press
(Example)
Enter the number of
items via the numeric
keyboard
The total price is
displayed.
(Example)
Using the balance returns into the weighing mode
To delete number of items press
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8 The menu
In the menu the settings of the balance can be modified and functions can be
activated. This way, the balance can be adjusted to individual weighing
requirements.
Menu items can be selected to change settings. Moreover there is an other menu
item for adjustment.
8.1 Navigation in the menu
Access to menu:
Operation
Display
Start balance by pressing
While the balance carries out
a self test, press ,
„Pn“ appears
Enter password „0000“
Press adjustment switch on
the lower side of the balance
(see chap. 6.9.1)
Press anew, the first
menu item „F0 CAL“ is
displayed
How to select menu items:
With help of , the individual menu items can be selected one after the other.
Select menu item:
Use to select the menu item.
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Exit menu and return to weighing mode
Use to return from the submenu item to the main menu item
Press again to exit the menu and to return into weighing mode.
8.2 Menu overview
Menu item
Submenu item
Description
F0 CAL
Adjustment process.
F1 rES
3 000
Resolution
6 000
dual
F2 CAP
3 kg
Capacity
6 kg
15 kg
30 kg
F3 PdESC
0
Decimal position weight value
0.0
0.00
0.000
F4 PdESC
mode
PriCE dESC
FLoAT
Decimal position basic price
(Kap. 7.7.1)
PriCE dESC
FIX
F5 init ZEro
init 2
Automatic zeroing range:
0 / 2 / 4 / 10 / 20
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F6 rE ZEro
rE 2
Manual zeroing range:
0 / 2 / 4 / 10 / 20 / 50 / 100
F7 trACK Zero
AZn
Track zero range:
0.5 d / 1 d / 2 d / 4 d
F8 SCSiVE
tArE
S tArE on
Taring:
several times
S tArE off
Taring:
once
F9 P Unit
Unit 2 off
not documented
F10 CoUnt
not documented
F11 SPEEd
SPEEd 7.5
not documented
SPEEd 15
SPEEd 30
SPEEd 60
F12 GrA
Grav
not documented
F13 Pin
P1
Enter the new password
P2
Enter new password anew
F14 rESEt
back to factory setting
9 Error messages
Error message
Possible cause
Remedy
Err 4
System out of zero range
during switching-on or by
pressing the button
Unload weighing system
and tare again using
.
Err 6
Internal A/D value outside
the normal range
To unload the weighing
system
Check connectors
If the error message appears repeatedly, please contact your retailer.
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10 Service, maintenance, disposal
10.1 Clean
Before cleaning, please disconnect the appliance from the operating voltage.
Keep IP protection (see chap. 6.7).
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. Polish with a dry soft cloth.
10.2 Service, maintenance
The appliance may only be opened by trained service technicians who are
authorized by KERN.
Ensure that the balance is regularly calibrated, see chap. 3.4 Testing instruments
control.
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.
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.
Batteries are inserted incorrectly or empty
No batteries inserted.
The displayed weight is permanently
changing
Draught/air movement
Table/floor vibrations
Weighing plate has contact with other
objects.
Electromagnetic fields / static charging
(choose different location/switch off
interfering device if possible)
The weighing result is obviously
incorrect
The display of the balance is not at zero
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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