KERN RFB User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
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
1Technical data................................................................................................ 4
2Device 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
3Basic Information (General).......................................................................... 9
3.1 Proper use.................................................................................................................................. 9
3.2 Improper Use.............................................................................................................................. 9
3.3 Warranty................................................................................................................................... 10
3.4 Monitoring of Test Resources................................................................................................... 10
4Basic Safety Precautions............................................................................ 10
4.1 Pay attention to the instructions in the Operation Manual ........................................................ 10
4.2 Personnel training..................................................................................................................... 10
5Transport and storage................................................................................. 11
5.1 Testing upon acceptance ......................................................................................................... 11
5.2 Packaging / return transport..................................................................................................... 11
6Unpacking, 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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7Operation...................................................................................................... 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
8The menu...................................................................................................... 34
8.1 Navigation in the menu............................................................................................................. 34
8.2 Menu overview.......................................................................................................................... 35
9Error 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. Dust-
proof.

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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.