KERN RFE User manual
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 manual
Price calculating balance
KERN RFE
Version 1.2
2020-05
GB
RFE-BA-e-2012
2 RFE-BA-e-2012
GB
KERN RFE
Version 1.22020-05
Operating manual
Price calculating balance
Contents
1Technical data................................................................................................ 4
1.1 Dimensions................................................................................................................................. 5
2Declaration of conformity ............................................................................. 5
3Appliance overview ....................................................................................... 6
3.1 Overview of display .................................................................................................................... 7
3.2 Keyboard overview..................................................................................................................... 8
4Basic Information (General)........................................................................ 10
4.1 Proper use................................................................................................................................ 10
4.2 Improper Use............................................................................................................................ 10
4.3 Warranty................................................................................................................................... 10
4.4 Monitoring of Test Resources .................................................................................................. 10
5Basic Safety Precautions............................................................................ 11
5.1 Pay attention to the instructions in the Operation Manual........................................................ 11
5.2 Personnel training..................................................................................................................... 11
6Transport and storage................................................................................. 11
6.1 Testing upon acceptance ......................................................................................................... 11
6.2 Packaging / return transport..................................................................................................... 11
7Unpacking, Setup and Commissioning ..................................................... 12
7.1 Installation Site, Location of Use.............................................................................................. 12
7.2 Unpacking................................................................................................................................. 12
7.2.1 Placing...................................................................................................................................... 12
7.2.2 Scope of delivery / serial accessories:..................................................................................... 13
7.3 Mains connection...................................................................................................................... 13
7.4 Rechargeable battery operation............................................................................................... 13
7.5 Initial Commissioning................................................................................................................ 14
7.6 Tripod........................................................................................................................................ 14
7.7 Adjustment................................................................................................................................ 15
7.8 Verification................................................................................................................................ 17
7.8.1 Adjustment switch and seals.................................................................................................... 18
7.9 Checking the balance verification settings............................................................................... 18
8The menu...................................................................................................... 19
8.1 Access to menu:....................................................................................................................... 19
8.2 Menu overview ......................................................................................................................... 20
9Operation...................................................................................................... 23
9.1 Turn on/off ................................................................................................................................ 23
9.2 Zeroing ..................................................................................................................................... 23
9.3 Weighing with tare.................................................................................................................... 23
9.4 Overload warning ..................................................................................................................... 24
10 Weighing with price determination ............................................................ 25
10.1 Basic price entry via keyboard ................................................................................................. 25
10.2 Memory for basic price (PLU = Price look up).......................................................................... 26
10.2.1 Direct PLU memory locations............................................................................................... 26
10.2.2 Indirect PLU memory locations............................................................................................ 28
10.2.3 Calculating the change......................................................................................................... 30
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11 Additional useful functions......................................................................... 32
11.1 Display background illumination............................................................................................... 32
11.2 AUTO-OFF............................................................................................................................... 33
11.3 Date and time........................................................................................................................... 33
12 RS 232 interface........................................................................................... 35
12.1 Technical data .......................................................................................................................... 35
12.2 Pin allocation of balance output bushing:................................................................................. 35
12.3 Data output format.................................................................................................................... 36
12.4 Printout examples:.................................................................................................................... 38
13 Servicing, maintenance, disposal .............................................................. 39
13.1 Cleaning ................................................................................................................................... 39
13.2 Servicing, maintenance............................................................................................................ 39
13.3 Disposal.................................................................................................................................... 39
14 Instant help................................................................................................... 40
14.1 Error messages ........................................................................................................................ 41
4 RFE-BA-e-2012
1 Technical data
KERN RFE 6K3M RFE 15K3M RFE 30K3M
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 / 2g 2 g / 5g 5 g / 10 g
Verification class III III III
Reproducibility 1 g / 2 g 2 g / 5 g 5 g / 10 g
Linearity ± 3 g / ± 6 g ± 6 g /± 15 g ± 15 g / ± 30 g
Recommended adjusting
weight (not supplied) 6 kg (M1) 15 kg (M1) 30 kg (M1)
Stabilization time 2 s
Heating time
(operating temperature) 10 min
Net weight (kg) 4.1
Basic price, can be switched
over €/kg; €/100 g
Admissible
ambient temperature -10° C to 40° C
Weighing surface (mm) 230 x 300
Tripod height (mm) 395
Auto-Off (battery; min.) 3, 5, 15, 30
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
(optional) 6 V, 4 Ah
Operating period - background illumination OFF:
60 h
6 RFE-BA-e-2012
3 Appliance overview
Models without post-mounted display:
Models with post-mounted display:
1. Bubble level
2. Weighing pan
3. Post-mounted display
4. Mains adapter connection
5. RS 232 interface
6. Footscrews
7. Adjustment switch
RFE-BA-e-2012 7
3.1 Overview of display
1
Weight
2
Taring value
3
Basic price
4
Sales price
5
Storage battery status display
6
Bubble level
Stability display
ZERO
Zeroing display
Battery symbol
€/kg Basic price in €/kg
€/100 g Basic price in €/100 g
AUTO CLEAR Set basic price is deleted automatically when balance is
unloaded
8 RFE-BA-e-2012
3.2 Keyboard overview
Selection
Function
~•Numerical keys, PLU-keys
•Delete
~ •Direct PLU keys
•PLU key
•(when saving articles, the current tare value is also
saved, see chapter 9.3.1)
or
•Numeric keys 4 and 6
•Scroll up (4) or down (6) in the menu
•For activated function, the set basic price is automatically
deleted when the balance is unloaded.
•Display background illumination
•Switch-over unit € / kg
€ / 100g
•Turn on/off balance
RFE-BA-e-2012 9
•Issue to external device
•Taring
•In menu: Confirm
•Pre-Tare:
Long key press: Enter tare value via numeric keys (s. ch.
9.3.1)
•Zeroing
•In menu: Exit menu
•Numeric key 0
10 RFE-BA-e-2012
4 Basic Information (General)
4.1 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
pan. As soon as a stable weighing value is reached the weighing value can be read.
4.2 Improper Use
Do not use 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“. (Example: Slowly draining fluids from a
container on the balance.)
Do not leave permanent load on the weighing pan. 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
damaged 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.
4.3 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
4.4 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.
RFE-BA-e-2012 11
5 Basic Safety Precautions
5.1 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.
5.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
6 Transport and storage
6.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
6.2 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.
12 RFE-BA-e-2012
7 Unpacking, Setup and Commissioning
7.1 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.
On the installation site observe the following:
•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.
7.2 Unpacking
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
7.2.1Placing
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
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7.2.2Scope of delivery / serial accessories:
•Balance
•Mains adapter
•Operating manual
•Tripod with screws
7.3 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.
7.4 Rechargeable battery operation
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 12 hours. Two symbols show the capacity of the
rechargeable battery:
•In the display the symbol
•The LED display above the loading battery status display
* Description
red: Battery is almost discharged
green: Rechargeable battery completely reloaded
yellow: Charging storage battery
* Loading battery status of the rechargeable battery with this symbol is only correctly
displayed, when the balance is supplied with energy not via the mains adapter.
14 RFE-BA-e-2012
7.5 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.
7.6 Tripod
Delivery volume includes a tripod for setting the display unit higher.
Assembly:
Lead the cable of the display unit through the
tripod.
Screw down the tripod at the display unit
Plug the tripod in the tripod foot at the
platform
Screw the tripod at the lower side of the
platform
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7.7 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. Position of adjustment switch, see chap.
7.8.1
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.
16 RFE-BA-e-2012
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 pan.
Arrange adjustment weight, details see chap.1 „Techn. data“
•Start balance by pressing . During the selftest press
. The password query "P in" is displayed.
•Using numeric keyboard, enter the standard password "9999".
"P in ----" is displayed.
•Confirm by , the menu is called up, the first menu point "F0
CAL" is displayed.
•
Press adjustment switch on the lower side of the balance
•Press , "F0 UnLoad" will be displayed. Ensure that there
are no weighing goods on the weighing pan. Wait for stability
display.
•Press anew. The value of the adjustment weight appears.
(example)
•Either place the displayed adjustment weight, or use the numeric
keys to enter a new adjustment weight.
•Acknowledge with . „Load“ is displayed.
•Place adjustment weight, wait for stability display and press
. “PASS“ will be displayed.
•Adjustment now has finished. Remove adjustment weight from
weighing plate.
The balance changes automatically into weighing
mode. The zero display appears.
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7.8 Verification
UUGeneral hints:
According to EU directive 2014/31/EU 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 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!
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.
18 RFE-BA-e-2012
7.8.1 Adjustment switch and seals
1. Seal mark
2. Cover
3. Verification switch
7.9 Checking the balance verification settings
For the adjustment, the balance must be switched over to service mode.
In calibrated scales the service mode is locked individually for each switch. To
disable the access lock, destroy the seal and actuate the switch.
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.
RFE-BA-e-2012 19
8 The menu
8.1 Access to menu:
•Start balance by pressing . During the selftest press .
The password query "P in" is displayed.
•Using numeric keyboard, enter the standard password "9999".
"P in ----" is displayed.
•Confirm by , the menu is called up, the first menu point "F0
CAL" is displayed.
•Press adjustment switch on the lower side of the balance
Select function:
Use the numeric keys , scroll up or down in the menu.
Confirm selected function by pressing . Select desired setting with
and acknowledge by .
Exit menu:
Press the button as often as necessary until the zero display appears. The
balance is now again in weighing mode.
20 RFE-BA-e-2012
8.2 Menu overview
Function Settings
or and
Description
or and
F0
CAL
Adjustment function
F1
rES
Press adjustment switch
Resolution
dUAL rAnGE
30000
60000
3000
6000
dUAL intEru
F2
CAP
Weighing range (max)
30KG
3KG
6KG
15KG
F3
oFFtmE
Auto Off function
15
30
oFF
3
5
F4
CLoCK
Time/Date
dAtE
timE
StYLE
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