KERN RPB_D User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Phone +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Instruction Manual
Price computing scales
KERN RPB_D
Version 2.4
04/2013
GB
RPB_D-BA-e-1324

RPB_D-BA-e-1324
2
GB
KERN RPB_D
Version 2.4 04/2013
Instruction Manual
Price computing scales
Contents
1Technical data................................................................................................ 4
1.1 Dimensions................................................................................................................................. 5
2Appliance overview ....................................................................................... 6
2.1 Overview of display..................................................................................................................... 7
2.2 Keyboard overview ..................................................................................................................... 9
3Basic Information (General)........................................................................ 10
3.1 Proper use................................................................................................................................ 10
3.2 Improper Use............................................................................................................................ 10
3.3 Warranty................................................................................................................................... 10
3.4 Monitoring of Test Resources................................................................................................... 10
4Basic Safety Precautions............................................................................ 11
4.1 Pay attention to the instructions in the Operation Manual ........................................................ 11
4.2 Personnel training..................................................................................................................... 11
5Transport and storage................................................................................. 11
5.1 Testing upon acceptance ......................................................................................................... 11
5.2 Packaging / return transport..................................................................................................... 11
6Unpacking, Setup and Commissioning ..................................................... 12
6.1 Installation Site, Location of Use .............................................................................................. 12
6.2 Unpacking................................................................................................................................. 12
6.3 Transport screw........................................................................................................................ 13
6.3.1 Placing...................................................................................................................................... 13
6.3.2 Scope of delivery / serial accessories:...................................................................................... 14
6.4 Mains connection...................................................................................................................... 14
6.5 Battery power supply (option)................................................................................................... 14
6.6 Initial Commissioning................................................................................................................ 14
6.7 Adjustment................................................................................................................................ 15
6.8 Verification................................................................................................................................ 17
6.8.1 Adjustment controls and seals.................................................................................................. 18
6.9 Checking the balance verification settings ............................................................................... 18
6.9.1 Service mode............................................................................................................................ 19
7Operation Mode ........................................................................................... 22
7.1 Turn on/off ................................................................................................................................ 22
7.2 Zeroing...................................................................................................................................... 22
7.3 Weighing with taring................................................................................................................. 22
7.4 Overload warning...................................................................................................................... 22
8Weighing with price determination............................................................ 23
8.1 Basic price entry via keyboard.................................................................................................. 23
8.1.1 Unit switch over €/kg to €/100 g................................................................................................ 24
8.2 Memory for basic price (PLU = Price look up).......................................................................... 26
9Additional useful functions......................................................................... 28
9.1 AUTO CLEAR........................................................................................................................... 28
9.2 Display background illumination............................................................................................... 28
9.3 AUTO POWER OFF................................................................................................................. 29

RPB_D-BA-e-1324
3
10 Service, maintenance, disposal.................................................................. 30
10.1 Cleaning.................................................................................................................................... 30
10.2 Service, maintenance............................................................................................................... 30
10.3 Disposal.................................................................................................................................... 30
11 Instant help................................................................................................... 31
11.1 Error messages........................................................................................................................ 31
12 Declaration of -Conformity.......................................................................... 32

RPB_D-BA-e-1324
4
1 Technical data
Models without vertical display:
KERN
RPB 6K1DM
RPB 15K2DM
RPB 30K5DM
Weighing range (max)
3 kg / 6 kg
6 kg / 15 kg
15 kg / 30 kg
Readability (d)
1 g / 2 g
2 g / 5 g
5 g / 10 g
Minimum load (Min)
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
2 g / 5 g
5 g / 10 g
Linearity
± 1 g / ±2 g
± 2 g /± 5 g
± 5 g / ±10 g
Recommended adjusting
weight (not supplied)
6 kg (F2)
15 kg (M1)
30 kg (M1)
Stabilization time
2 s
Heating time (operating
temperature)
10 min
Net weight (kg)
3.8 kg
Basic price, can be
switched over
€/kg; €/100 g
Admissible
ambient temperature
-10° C to 40° C
Allowable air humidity
0 % - 80 % (non-condensing)
Electric Supply
Mains adapter 220 V –240 V AC 50 Hz
balance 12 V, 500 mA
Rechargeable battery
(Option)
6 V, 4 Ah
Operating time –background lighting on 40 hrs.
Operating time –background lighting off 80 hrs.
Loading time approx. 12 hrs.

RPB_D-BA-e-1324
5
Models with post-mounted display:
KERN
RPB 6K1DHM
RPB 15K2DHM
RPB 30K5DHM
Weighing range (max)
3 kg / 6 kg
6 kg / 15 kg
15 kg / 30 kg
Readability (d)
1 g / 2 g
2 g / 5 g
5 g / 10 g
Minimum load (Min)
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
2 g//5 g
5 g//10 g
Linearity
± 1 g / ±2 g
± 2 g /± 5 g
± 5 g / ±10 g
Recommended adjusting
weight (not supplied)
6 kg (F2)
15 kg (M1)
30 kg (M1)
Stabilization time
2 s
Heating time (operating
temperature)
10 min
Net weight (kg)
4.8 kg
Basic price, can be
switched over
€/kg; €/100 g
Admissible
ambient temperature
-10° C to 40° C
Allowable air humidity
0 % - 80 % (non-condensing)
Electric Supply
Mains adapter 220 V –240 V AC 50 Hz
balance 12 V, 500 mA
Rechargeable battery
(Option)
6 V, 4 Ah
Operating time –background lighting on 40 hrs.
Operating time –background lighting off 80 hrs.
Loading time approx. 12 hrs.
1.1 Dimensions

RPB_D-BA-e-1324
6
2 Appliance overview
Models without vertical display:
Models with post-mounted display:
1. Weighing plate / rechargeable battery compartment (under weighing plate)
2. Bubble level
3. Post-mounted display
4. Not documented
5. Foot screws
6. ON/OFF switch
7. Mains adapter connection
8. Adjustment switch

RPB_D-BA-e-1324
7
Weight
Basic price
Sales price
2.1 Overview of display
Operator and secondary display (standard on the backside of models without
post-mounted display):
Weight
Basic price
Sales price
Storage battery status display
Post-mounted display for models with tripod:

RPB_D-BA-e-1324
8
Display weight
Here, the weight of your goods is displayed.
Indicator next to symbol displays:
Battery very low
GROSS
Gross weight
NET
Net weight
Stability display
Zeroing display
Display basic price
Basic price, can be switched over from € / kg or € / 100 g.
Indicator next to symbol displays:
€/kg
Basic price in €/kg
€/100 g
Basic price in €/100 g
Display sale price
Here the sales price is displayed in Euro [€].
Indicator next to symbol displays:
AUTO CLEAR
Set basic price is deleted automatically when
balance is unloaded
BAR
Calculating the change (see chap. 8.2)
Storage battery status display
red
Charging storage battery
green
Battery is completely discharged

RPB_D-BA-e-1324
9
2.2 Keyboard overview
Bubble level
Selection
Function
~
3 Numerical keys, PLU-keys
Delete
Save basic price (press and hold key for a long time) see
chap. 8.2
Call-up basic price (press and hold key for a short time),
see chap. 8.2
Switch-over unit € / kg € / 100g
Issue to external device
Parameter selection
Calculating the change, see chap. 8.2
Taring, see chap. 7.3
Storing settings
Background illumination of the display, see chap. 9.2
If function is activated, the set basic price is automatically
deleted when the balance is unloaded, see chap. 9.1
Zeroing
Back to weighing mode

RPB_D-BA-e-1324
10
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.
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.

RPB_D-BA-e-1324
11
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.
Versions in other languages are non-binding translations.
The only binding version is the original document in German.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
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.

RPB_D-BA-e-1324
12
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;
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.
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
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.

RPB_D-BA-e-1324
13
6.3 Transport screw
Remove the transport screw essential
(available only at 6 kg model)
To loosen the transportation lock, unscrew transportation screw [1] anti-clockwise.
For transport, transport screw gently until it stops turning clockwise and then secure
with lock nut.
6.3.1 Placing
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
1

RPB_D-BA-e-1324
14
6.3.2 Scope of delivery / serial accessories:
Balance, see chap. 2
Mains adapter
Protective cover
Instruction Manual
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.
6.5 Battery power supply (option)
The rechargeable battery is charged via the delivered power supply.
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 15 hours.
If an arrow appears on the weight display above the battery symbol , this
is an indication that the capacity of the rechargeable battery will soon be
exhausted. The balance will be ready to operate for about another 10 hours, then
it will switch off automatically. Charge the battery with the help of the supplied
power pack.
If in the weight display appears „bat Lo“ followed by a flickering display, the
capacity of the rechargeable battery is below the prescribed minimum. The
balance will be ready to operate for about another 5 minutes, then it will switch off
automatically. Charge the battery with the help of the supplied power pack.
The LED display informs you during loading about the loading status of the
rechargeable battery.
red:
Battery is almost discharged
green:
Battery is completely discharged
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. During this warming
up time the balance must be connected to the power supply (mains, accumulator or
battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.

RPB_D-BA-e-1324
15
6.7 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.
The adjustment is locked for verified balances. Carrying out adjustment
requires that the seal is destroyed and the adjusting switch is confirmed in
step 3 when turning on the scale. For position of adjusting switch, see chpt.
6.8.1
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.
Procedure when adjusting:
Observe stable environmental conditions. A warming up time (see chapter 1) is
required for stabilization. Ensure that there are no objects on the weighing plate.
Arrange adjustment weight, details see chap.1 „Technical data“
1. Switch-on balance and during the selftest press .
2. Use the numeric keys to enter „0000“ for a password and confirm bypressing .

3. The adjustment function „CAL F0“ is displayed. Press the adjusting switch and
confirm by pressing .

RPB_D-BA-e-1324
16
4. Ensure that there are no objects on the weighing plate. Wait for stability display,
then press . The required adjustment weight is shown.
5. Place the adjustment weight carefully in the centre of the weighing pan, press
and the adjusting process will be started.


6. The adjustment process has been successfully completed. Take away
adjustment weight.
7. Press and the scales will return to weighing mode.
In case of an adjustment error or incorrect adjusting weight the display will
show an error message ( / ), repeat adjustment process.

RPB_D-BA-e-1324
17
6.8 Verification
UUGeneral:
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.
After verification the balance is sealed at the indicated positions.
Verification of the balance is invalid without the "seal".
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 verified and re-verified in 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!
Balances with obligation to verify must be taken out of operation if:
The weighing result of the balance is outside the error limit. Therefore, in
regular intervals load balance with known test weight (ca. 1/3 of the max. load)
and compare with displayed value.
The reverification deadline has been exceeded.

RPB_D-BA-e-1324
18
6.8.1 Adjustment controls and seals
Possible seals: enforced, and or
1. Seal mark 1
2. Cover
3. Verification switch
4. Verification wire
6.9 Checking the balance verification settings
For the adjustment, the balance must be switched over to service mode.
In the service mode the parameters of the balance can be modified.
If this happened accidentally, please contact KERN.
In calibrated scales the service mode is locked individually for each switch. To
disable the access lock, destroy the seal and confirm the swatch. For position of
switch see chpt. 6.8.1.
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.

RPB_D-BA-e-1324
19
6.9.1 Service mode
This overview of the service parameters is merely for checking the parameters
set by the appropriate Bureau of Standards. No changes may be made.
Access to menu:
1. Switch-on balance and during the selftest press .
2. Use the numeric keys to enter „0000“ for a password and confirm by .

3. The first function „F0 CAL“ is displayed. Press adjusting switch.
Select function:
You can select individual functions containing the current settings one after the
other by using or a numeric key (i.e. for F0 or 2 for F2).
Change / save settings:
Confirm selected function by pressing . Select desired setting by pressing
and confirm by pressing or cancel by pressing .
Exit menu:
Using the balance returns into the weighing mode.

RPB_D-BA-e-1324
20
Overview for service parameter:
Factory settings are marked by [*].
Function
Settings

Description


CAL
F0
Adjustment function, see chpt. 6.7
CAL
F1
Resolution
rES
1
3000
rES
1
6000
rES
dual
rAnge*
Always use this setting
CAL
F2
€ / kg can be switched over to € /
100g
Price
Unit
1*
Always use this setting
Price
Unit
2
CAL
F3
Weighing range (max)
CAPA
6
Factory setting
RPB 6K1DM, RPB 6K1DHM
CAPA
15
Factory setting
RPB 15K2DM, RPB 15K2DHM
CAPA
30
Factory setting
RPB 30K5DM, RPB 30K5DHM
CAL
F4
Position decimal point
”weight display“
0.000
Point
Factory setting
RPB 6K1DM, RPB 6K1DHM,
RPB 15K2DM, RPB 15K2DHM
0.00
Point
Factory setting
RPB 30K5DM, RPB 30K5DHM
0.0
Point
0
Point