KERN & SOHN KFN-TM User Manual
KERN & Sohn GmbH
Ziegelei 1
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Internet: www.kern-sohn.com
Operating and Installation Instructi ons
Display devices
KERN KFB/KFN-TM
Version 2.3
07/2013
GB
D-72336 Balingen
Fax: +49-[0]7433-9933-149
KFB/KFN-TM-BA_IA-e-1323
KERN KFB/KFN -TM
Display units
GB
Version 2.3 07/2013
Operating and installa t ion instructions
Contents
1 Technical data ................................................................................................ 4
2 Appliance overview ....................................................................................... 5
2.1 Keyboard overview ..................................................................................................................... 7
2.1.1 Numerical input via the navigation buttons................................................................................. 8
2.2 Overview of display .................................................................................................................... 8
3 Basic Information (General) .......................................................................... 9
3.1 Proper use .................................................................................................................................. 9
3.2 Improper Use .............................................................................................................................. 9
3.3 Warranty ..................................................................................................................................... 9
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 ................................................................................. 10
5.1 Testing upon acceptance ......................................................................................................... 10
5.2 Packaging / return transport ..................................................................................................... 10
6 Unpacking and placing ................................................................................ 11
6.1 Installation Site, Location of Use .............................................................................................. 11
6.2 Unpacking ................................................................................................................................. 11
6.3 Scope of delivery / serial accessories: ..................................................................................... 11
6.4 Transportation lock (illustration example) ................................................................................. 12
6.5 Error message .......................................................................................................................... 12
6.6 Placing ...................................................................................................................................... 13
6.7 Mains connection ...................................................................................................................... 14
6.8 Storage battery operation (optional) ......................................................................................... 14
6.9 Adjustment ................................................................................................................................ 15
6.9.1 Verified weighing systems ........................................................................................................ 15
6.9.2 Non verifiable weighing syst ems .............................................................................................. 18
6.10 Linearization ............................................................................................................................. 19
6.10.1 Verified weighing systems:................................................................................................... 19
6.10.2 Non-verified weighing systems ............................................................................................ 20
6.11 Verification ................................................................................................................................ 21
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7 Operation ...................................................................................................... 24
7.1 Start-up ..................................................................................................................................... 24
7.2 Switching Off ............................................................................................................................ 24
7.3 Zeroing ..................................................................................................................................... 24
7.4 Simple weighing ....................................................................................................................... 24
7.5 Switch-over weighing unit (only not verifiable weighing systems) ........................................... 25
7.6 Weighing with tare .................................................................................................................... 26
7.7 Weighing with tolerance range ................................................................................................. 27
7.7.1 Tolerance check for target weight ............................................................................................ 28
7.7.2 Tolerance check for target quantity .......................................................................................... 30
7.8 Manual totalizing ....................................................................................................................... 32
7.9 Automatic adding-up ................................................................................................................. 34
7.10 Parts counting ........................................................................................................................... 35
7.11 Animal weighing ....................................................................................................................... 36
7.12 Lock keyboard .......................................................................................................................... 37
7.13 Display background illum inatio n ............................................................................................... 37
7.14 Automatic switch-off function „AUTO OFF“ .............................................................................. 38
8 Menu ............................................................................................................. 39
8.1 Overview non verifiable weighing systems (contacts of circuit board [K1] not short-circuited) 40
8.2 Overview verified weighing systems (contacts of circuit board [K1] short-circuited by means of
jumper) 43
9 Service, maintenance, disposal .................................................................. 46
9.1 Clean ........................................................................................................................................ 46
9.2 Service, maintenance ............................................................................................................... 46
9.3 Disposal .................................................................................................................................... 46
9.4 Error messages ........................................................................................................................ 46
10 Data output RS 232C ................................................................................... 48
10.1 Technical data .......................................................................................................................... 48
10.2 Printer mode ............................................................................................................................. 48
10.3 Output log (continuous output) ................................................................................................. 49
10.4 Remote control instructions ...................................................................................................... 49
11 Instant help ................................................................................................... 50
12 Installing display unit / weighi ng bridge .................................................... 51
12.1 Technical data .......................................................................................................................... 51
12.2 Weighing system design........................................................................................................... 51
12.3 How to connect the platform ..................................................................................................... 52
12.4 Configure display unit ............................................................................................................... 53
12.4.1 Verified weighing systems (contacts of circuit board [K1] short-circuited by means of
jumper) 53
12.4.2 Non verifiable weighing systems (contacts of circuit board [K1] not short-circ u it ed ) .......... 59
13 Declaration of Conformity / Test Certificate .............................................. 63
KFB/KFN-TM-BA_IA-e-1323 3
1 Technical data
KERN KFB-TM KFN-TM
Display 5 ½ - digit
Resolution (verified) 6000
Single (Max.) 6.000 e
Dual (Max.) 3.000 e
Resolution (non-verified) 30.000
Weighing ranges 2
Divisions 1,2,5,…10n
Weighing Units kg
Functions
Display LCD 52 mm digits with back lighting
DMS weighing cells
Range calibration We recommend ≥ 50 % max.
Data output RS232
Electric Supply
Housing 250 x 160 x 58 266 x 165 x 96
Admissible
ambient temperature
Net weight 1.5 kg 2 kg
Rechargeable battery
(optional)
Operating / charge time
Weighing with tolerance range, Totalizing, Animal
weighing
80-100 Ω. Max. 4 item per 350 Ω;
Sensitivity 2-3 mV/V
Input voltage 220 V – 240 V, 50 Hz
Power pack secondary voltage 12V, 500mA
0°C – 40°C (non-verified)
-10°C – 40°C (verified)
35 h / 12 h 90 h / 12 h
RS 232 interface Standard Option
Tripod KERN BFS-07, option
Support base
incl. wall bracket
IP protection -
4 KFB/KFN-TM-BA_IA-e-1323
Standard
IP 67 as per DIN 60529
(rechargeable battery
operation only)
2 Appliance overview
KFB-TM: Synthetic finis h
1. Status of rechargeable battery
2. Keyboard
3. Weight display
4. Tolerance margin, see chap. 7.7
5. Weighing unit
6. RS-232
7. Input connection load cell cable
8. Guide rail support base / stand
9. End stop support base / stand
10. Mains adapter connection
11. Adjustment switch
KFB/KFN-TM-BA_IA-e-1323 5
KFN-TM: Stainless steel finish
1. Status of rechargeable battery
2. Keyboard
3. Weight display
4. For tolerance mark see chap. 7.7
5. Weighing unit
6. Input connection load cell cable
7. Mains adapter connection
6 KFB/KFN-TM-BA_IA-e-1323
2.1 Keyboard overview
Key Function
• Turn on/off
• Zeroing
Navigation button
Navigation key
Navigation key
Navigation key
C
• Confirm entry
• Taring
• At numeric input increase flashing digit
• Scroll forward in menu
• Display sum total
• Digit selection to the right
• Add weighing value to summation memory
• Digit select ion to the left
• Calculate weighing data via interface
• Delete
• Change between gross and net weight
ESC
KFB/KFN-TM-BA_IA-e-1323 7
• Back to menu/weighing mode
• Call up an imal weighing funct ion
• Call up weighing with tolerance range
• Delete total added memory
2.1.1 Numerical input via the navigation buttons
Press and current setting will be displayed. The first digit will be flashing
and is ready for changing.
If you do not wish to change the first digit, press and the second digit will
start flashing.
Each time you press , the display will move to the subsequent digit, after the
last digit the display will return to the first digit.
To change the selected (flashing) digit, press repeatedly until the desired
value is displayed. Then press to access further digits and change them by
.
Complete your entry by .
2.2 Overview of display
Display Significance
Battery very low
STABLE Stability display
ZERO Zero indicator
GROSS Gross weight
NET Net weight
AUTO Automatic add-up enabled
Kg Weighing unit
M+ Totalisation
LED
+ / / -
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Indicators for weighing with tolerance range
3 Basic Information (General)
3.1 Proper use
The display unit acquired by you is used in combination with a weighing plate and
serves to determine the weighing value of material to be weighed. It is intended to be
used as a “non-automatic weighing system”, 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 display unit for dynamic weighings. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results ca n be
displayed due to the “stability compensation“ in the display unit. (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 weighing
plate, minus a possibly existing tare load, must be strictly avoided. Both, the weighi ng
plate and the display unit may be damaged during this process.
Never operate display unit in explosive environment. The serial version is not
explosion protected.
Changes to the display unit's design are not permitted. This may lead to incorrect
weighing results, safety-related faul ts and des tr ucti on o f the dis pl ay unit.
The display unit may only be operated in accordance with the described default
settings. 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 opene d
• 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
KFB/KFN-TM-BA_IA-e-1323 9
3.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the display
unit 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 display units’ test substances and the test weights required for this. In
KERN’s accredited DKD calibration laboratory test weights and display units 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.
5 T ransport 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.
10 KFB/KFN-TM-BA_IA-e-1323
• Display Unit
6 Unpacking and placing
6.1 Installation Site, Location of Use
The display units are designed in a way that reliable weighing results are achieved in
common conditions of use.
Precise and fast work is achieved by selecting the right place for your display unit
and your weighing plate.
On the installation site observe the following:
• Place the display unit and the weighing plate on a stable, even surface.
• Avoid extreme heat as well as temperature fluctuation caused by installing
next to a radiator or in the direct sunlight;
• Protect the display unit and the weighing plate against direct draf t fr om ope n
windows or doors.
• Avoid jarring during weighing;
• Protect the display unit and the weighing plate against high humidity, vapours
and dust.
• Do not expose the display unit 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.
Major display deviations (incorrect weighing results) may be experienced should
electromagnetic fields (e.g. due to mobile phones or radio equipment), static
electricity accumulations or instable power supply occur. Change location or remove
source of interference.
6.2 Unpacking
Take the display unit carefully out of its packaging, remove the plastic jacket and
install it at the designated work space.
6.3 Scope of delivery / serial accessories:
• Mains adapter
• Support base incl. wall bracket
• Operating instructions
KFB/KFN-TM-BA_IA-e-1323 11
Transport Securing
6.4 Transportation lock (illustration example)
Please note: if the display unit is used together with platform with transportation lock,
this transportation lock must be released prior to use:
6.5 Error message
As soon as an error message appears in the balance display, the
balance must not more be used, e.g. Err 4
12 KFB/KFN-TM-BA_IA-e-1323
6.6 Placing
Mount the display unit in a way that facilitates operation and where it is easy to see.
Usage with support base (KFB-TM only)
Push support base holder in guide rail [8] up to end stop [9], see chap. 2.
Usage with wall mount (KFB-TM only)
Use the wall mount to affix the display unit to the wall.
Using with tripod (optional)
An optional tripod (KERN BFS-07) is available if the display unit is to be mounted
in a raised position.
KFB/KFN-TM-BA_IA-e-1323 13
6.7 Mains connection
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage.
Only use original KERN mains adapters. Using other makes requires consent by
KERN.
6.8 Storage battery operation (optional)
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 12 hours.
If the weight display shows , this is an indication that the capacity of the
rechargeable battery is almost exhausted. The unit will be ready for operation for
approx. another 10 hours before switching 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: Voltage has dropped below prescribed minimum.
green: Battery is completely discharged
yellow: Charging storage battery
To conserve energy, enable the automatic switch-o ff function „AUTO OFF“, see
chap. 7.14.
14 KFB/KFN-TM-BA_IA-e-1323
•
6.9 Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each display unit with connected weighing plate 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 weighing system 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 display unit periodically in weighing operation.
• In weighing systems with a resolution of < 15 000 dividing steps an
adjustment is recommended.
In weighing systems with a resolution of > 15 000 dividing steps a
linearisation is recommended (see chap. 6.10).
• Prepare the required adjustment weight. The weight to be used dep ends
on the capacity of the scale. Carry out adjustment as near as possible to
the scale’s maximum weight. Info about test weights can be found on
the Internet at: http://www.kern-sohn.com.
• Observe stable environmental conditions. Stabilisation requires a certain
warm-up time.
6.9.1 Verified weighing systems
In verified weighing systems the menu item for adjustment „P2 mode“ is
blocked.
KERN KFB-TM
To disable the access lock, destroy the seal and actuate the adjustment
switch. Position of the adjustment switch see chap. 6.11
KERN KFN-TM
To override the blocked access you will have to destroy the seal before calling
up the menu and to short-circuit the two contacts on the circuit board [K2],
using a jumper (See chap. 6.11).
Attention:
After destruction of the seal the weighing system must be re-veri fied by an
authorised agency and a new verification wire/seal mark fitted before it can be
reused for applications subject to verification.
KFB/KFN-TM-BA_IA-e-1323 15
Call up menu:
1. Switch-on balance and during the selftest press .
2. Press , , subsequently, the first menu block
„PO CHK“ will be displayed.
3. Press repeatedly until „P2 mode“ will be displayed.
For the KFB-TM model operate the adjustment switch.
4. Press and select the set weighing scales type by .
= Single-range balance
= Dual range balance
= Multi-interval balance
5. Acknowledge with .
6. Press repeatedly until „CAL“ will be displayed.
7. Confirm with and select setting „noLin“ by .
16 KFB/KFN-TM-BA_IA-e-1323
How to carry out an adjustment:
Confirm menu setting „noLin“ by .
Ensure that there are no objects on the weighing plate.
Wait for stability display, then press .
The currently set adjustment weight will be displayed.
To change by using the navigation buttons (see chap. 2.1.1)
select the desired setting, the active digit is flashing.
Acknowledge with .
Carefully place adjusting weight in the centre of the weighing
plate. Wait for stability display, then press .
After the adjustment the balance will carry out a self-test.
Remove adjusting weight during selftest, balance will return
into weighing mode automatically.
An adjusting error or incorrect adjusting weight will be
indicated by the error message; repeat adjustment
procedure.
KFB/KFN-TM-BA_IA-e-1323 17
Call up menu:
6.9.2 Non verifiable weighing systems
1. Switch-on balance and during the selftest press .
2. Press subsequently , , the first menu block
„PO CHK“ will be displayed.
3. Press repeatedly until „P3 CAL“ will be displayed.
4. Confirm with ; press repeatedly until „CAL“
appears.
5. Acknowledge using , the current setting is displayed.
Press to confirm; press to select setting.
noLin = adjustment
LineAr = linearization, see chap. 6.10
How to carry out adjustment:
Confirm menu setting „noLin“ by .
Ensure that there are no objects on the weighing plate.
Wait for stability display, then press .
The currently set adjustment weight will be displayed.
To change by using the navigation buttons (see chap. 2.1.1)
select the desired setting, the active digit is flashing.
Acknowledge with .
Carefully place adjusting weight in the centre of the weighing
plate. Wait for stability display, then press .
After the adjustment the balance will carry out a self-test.
Remove adjusting weight during selftest, balance will return
into weighing mode automatically. An adjusting error or
incorrect adjusting weight will be indicated by the error
message; repeat adjustment procedure.
18 KFB/KFN-TM-BA_IA-e-1323
• In balances with a resolution of > 15 000 dividing steps carrying out a
the adjustment switch s ee chap. 6.11
6.10 Linearization
Linearity shows the greatest deviation of a weight display on the scale to the value of
the respective test weight according to plus and minus over the entire weighi ng
range. If linearity deviation is discovered during a testing instrument control, you can
improve this by means of linearization.
6.10.1 Verified weighing systems:
linearisation is recommended.
• Carrying out linearization is restricted to specialist staff possessing
well acquainted with the workings of weighing scales.
• The test weights to be used must be adapted to the weighing scale’s
specifications; see chapter “testing instruments control”.
• Observe stable environmental conditions. Stabilisation requires a
certain warm-up time.
• After successful linearisation you will have to carry out calibration;
see chapter “testing instruments control”.
• The adjustment is locked for verified balances. To disable the access
lock, destroy the seal and actuate the adjustment switch. Position of
Menu item P2 modeCalCall up liner, see chap. 6.9.1
Confirm by , the password query „Pn“ will be displayed.
Press subsequently , , or , , .
Ensure that there are no objects on the weighing pan.
Wait for stability display, then press .
When “Ld 1“ is displayed, put the first adjustment weight (1/3
max) carefully in the centre of the weighing platform. Wait for
stability display, then press .
When “Ld 2“ is displayed, put the second adjustment weight
(2/3 max) carefully in the centre of the weighing platform.
Wait for stability display, then press .
When “Ld 3“ is displayed, put the third adjustment weight
(max) carefully in the centre of the weighing platform. Wait
for stability display, then press .
KFB/KFN-TM-BA_IA-e-1323 19
After linearisation the balance will carry out a self-test.
Remove adjusting weight during selftest, balance will return
into weighing mode automatically.
6.10.2 Non-verified weighing systems
Call-up menu item P3 CALCalLiner , see c hap. 6.9.1
Confirm by , the password query „Pn“ will be displayed.
Press , , or , , subsequently.
Ensure that there are no objects on the weighing pan.
Wait for stability display, then press .
When “Ld 1“ is displayed, put the first adjustment weight (1/3
max) carefully in the centre of the weighing platform. Wait for
stability display, then press .
When “Ld 2“ is displayed, put the second adjustment weight
(2/3 max) carefully in the centre of the weighing platform.
Wait for stability display, then press .
When “Ld 3“ is displayed, put the third adjustment weight
(max) carefully in the centre of the weighing platform. Wait
for stability display, then press .
After a successful linearisation the balance will carry out a
self-test. Remove adjusting weight during selftest, bal a nce
will return into weighing mode automatically.
20 KFB/KFN-TM-BA_IA-e-1323
6.11 Verification
General introduction:
According to EU directive 90/384/EEC balances must be officially verified if they are
used as follows (legal ly 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.
Verification notes:
An EU Qualification Approval is in existence for verified weighing systems. If a
balance is used where obligation to verify exists as described above, it must be
verified and re-verified at regular intervals.
Reverification is carried out according to the relevant national statutory 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 weighing system is invalid without the "seal".
KFB/KFN-TM-BA_IA-e-1323 21
[K1]
Notes on verified weighing systems
KFB-TM:
Access to conductor plate:
• Remove seal
• Open display unit
• The application of the display unit as a weighing system able to be veri fie d
requires that the contacts of the circuit board are short-circuited with the help
of a jumper [K1].
For non verifiable weighing systems remove the jumper.
In verified weighing systems the menu item for adjustment, „P2 mode“ will be
blocked.
To disable the access lock, destroy the seal and actuate the adjustment switch.
Position of seals and adjusting switch
1. Self-destroying seal mark
2. Adjustment switch
3. Cover of adjustment switch
4. Self-destroying seal mark
22 KFB/KFN-TM-BA_IA-e-1323
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