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 and Installation Instructions
Display devices
KERN KFB/KFN-TM
Version 2.4
04/2016
GB
KFB/KFN-TM-BA_IA-e-1624
2 KFB/KFN-TM-BA_IA-e-1624
GB
KERN KFB/KFN-TM
Version 2.4 04/2016
Operating and installat ion instructions
Display units
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 .................................................................................................................... 9
3 Basic Information (General ) ........................................................................ 10
3.1 Proper use ................................................................................................................................ 10
3.2 Improper Use ............................................................................................................................ 10
3.3 Warranty ................................................................................................................................... 10
3.4 Monitoring of Test Resources .................................................................................................. 11
4 Basic Safety Precauti on s ............................................................................ 11
4.1 Pay attention to the instructions in the Operation Manual........................................................ 11
4.2 Personnel training ..................................................................................................................... 11
5 Transport and storage ................................................................................. 11
5.1 Testing upon acceptance ......................................................................................................... 11
5.2 Packaging / return transport ..................................................................................................... 11
6 Unpacking and placing ................................................................................ 12
6.1 Installation Site, Location of Use .............................................................................................. 12
6.2 Unpacking ................................................................................................................................. 12
6.3 Scope of delivery / serial accessories: ..................................................................................... 12
6.4 Transportation lock (illustration example) ................................................................................. 13
6.5 Error message .......................................................................................................................... 13
6.6 Placing ...................................................................................................................................... 14
6.7 Mains connection ...................................................................................................................... 15
6.8 Storage battery operation (optional) ......................................................................................... 15
6.9 Adjustment ................................................................................................................................ 16
6.9.1 Verified weighing systems ........................................................................................................ 16
6.9.2 Non verifiable weighing systems .............................................................................................. 19
6.10 Linearization ............................................................................................................................. 20
6.10.1 Verified weighing systems:................................................................................................... 20
6.10.2 Non-verified weighing systems ............................................................................................ 21
6.11 Verification ................................................................................................................................ 22
KFB/KFN-TM-BA_IA-e-1624 3
7 Operation ...................................................................................................... 25
7.1 Start-up ..................................................................................................................................... 25
7.2 Switching Off ............................................................................................................................ 25
7.3 Zeroing ..................................................................................................................................... 25
7.4 Simple weighing ....................................................................................................................... 25
7.5 Switch-over weighing unit (only not verifiable weighing systems) ........................................... 26
7.6 Weighing with tare .................................................................................................................... 27
7.7 Weighing with tolerance range ................................................................................................. 28
7.7.1 Tolerance check for target weight ............................................................................................ 29
7.7.2 Tolerance check for target quantity .......................................................................................... 31
7.8 Manual totalizing ....................................................................................................................... 33
7.9 Automatic adding-up ................................................................................................................. 35
7.10 Parts counting ........................................................................................................................... 36
7.11 Animal weighing ....................................................................................................................... 37
7.12 Lock keyboard .......................................................................................................................... 38
7.13 Display background illum ination ............................................................................................... 38
7.14 Automatic switch-off function „AUTO OFF“ .............................................................................. 39
8 Menu ............................................................................................................. 40
8.1 Overview non verifiable weighing systems (contacts of circuit board [K1] not short-circuited) 41
8.2 Overview verified weighing systems (contacts of circuit board [K1] short-circuited by means of
jumper) 44
9 Service, maintenance, disposal .................................................................. 47
9.1 Clean ........................................................................................................................................ 47
9.2 Service, maintenance ............................................................................................................... 47
9.3 Disposal .................................................................................................................................... 47
9.4 Error messages ........................................................................................................................ 47
10 Data output RS 232C ................................................................................... 49
10.1 Technical data .......................................................................................................................... 49
10.2 Printer mode ............................................................................................................................. 49
10.3 Output log (continuous output) ................................................................................................. 50
10.4 Remote control instructions ...................................................................................................... 50
11 Instant help ................................................................................................... 51
12 Installing display unit / weighing bridge .................................................... 52
12.1 Technical data .......................................................................................................................... 52
12.2 Weighing system design........................................................................................................... 52
12.3 How to connect the platform ..................................................................................................... 53
12.4 Configure display unit ............................................................................................................... 54
12.4.1 Verified weighing systems (contacts of circuit board [K1] short-circuited by means of
jumper) 54
12.4.2 Non verifiable weighing systems (contacts of circuit board [K1] not short-circ u ite d ) .......... 60
13 Declaration of Conformity / Test Certificate .............................................. 64
4 KFB/KFN-TM-BA_IA-e-1624
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
Weighing with tolerance range, Totalizing, Animal
weighing
Display LCD 52 mm digits with back lighting
DMS weighing cells
80-100 Ω. Max. 4 item per 350 Ω;
Sensitivity 2-3 mV/V
Range calibration We recommend ≥ 50 % max.
Data output RS232
Electric Supply
Input voltage 220 V – 240 V, 50 Hz
Power pack secondary voltage 12V, 500mA
Housing 250 x 160 x 58 266 x 165 x 96
Admissible
ambient temperature
0°C – 40°C (non-verified)
-10°C – 40°C (verified)
Net weight 1.5 kg 2 kg
Rechargeable battery
(optional)
Operating / charge time
35 h / 12 h 90 h / 12 h
RS 232 interface Standard Option
Tripod KERN BFS-07, option
Support base
incl. wall bracket
Standard
IP protection -
IP 67 as per DIN 60529
(rechargeable batter y
operation only)
KFB/KFN-TM-BA_IA-e-1624 5
2 Appliance overview
KFB-TM: Synthetic finish
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
6 KFB/KFN-TM-BA_IA-e-1624
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
KFB/KFN-TM-BA_IA-e-1624 7
2.1 Keyboard overview
Key Function
• Tu rn on/off
• Zeroing
Navigation button
• Confirm entry
• Taring
Navigation key
• At numeric input increase flashing digit
• Scroll forward in menu
• Display sum total
Navigation key
• Digit selection to the right
• Add weighing value to summation memory
Navigation key
• Digit selection to the left
• Calculate weighing data via interface
C
• Delete
• Change between gross and net weight
ESC
• Back to menu/weighing mode
• Call up animal weighing function
• Call up weighing with tolerance range
• Delete total added memory
8 KFB/KFN-TM-BA_IA-e-1624
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 .
KFB/KFN-TM-BA_IA-e-1624 9
2.2 Overview of display
Display Significance
Weighing range 1
Weighing range 2
Battery very low
STABLE Stability display
ZERO Zero indicator
GROSS Gross weight
NET Net weight
AUTO Au tomatic add-up enabled
Kg Weighing unit
M+ Totalisation
LED
+ / / -
Indicators for weighing with tolerance range
10 KFB/KFN-TM-BA_IA-e-1624
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 can 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 weighing
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 faults and des tr uct ion of the display 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 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
KFB/KFN-TM-BA_IA-e-1624 11
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.
12 KFB/KFN-TM-BA_IA-e-1624
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 draft from open
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:
• Display Unit
• Mains adapter
• Support base incl. wall bracket
• Operating instructions
KFB/KFN-TM-BA_IA-e-1624 13
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
Transport Securing
14 KFB/KFN-TM-BA_IA-e-1624
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-1624 15
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-off function „AUTO OFF“, see
chap. 7.14.
16 KFB/KFN-TM-BA_IA-e-1624
6.9 Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each display unit with conn ected 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 depends
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-verified by an
authorised agency and a new verification wire/seal mark fitt ed be for e it can be
reused for applications subject to verification.
KFB/KFN-TM-BA_IA-e-1624 17
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 .
18 KFB/KFN-TM-BA_IA-e-1624
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-1624 19
6.9.2 Non verifiable weighing systems
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 „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.
20 KFB/KFN-TM-BA_IA-e-1624
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 weighing
range. If linearity deviation is discovered during a testing instrument control, you can
improve this by means of linearization.
• In balances with a resolution of > 15 000 dividing steps carrying out a
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
the adjustment switch see ch ap. 6.11
6.10.1 Verified weighing systems:
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 adj ustm ent w ei g ht
(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-1624 21
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 chap. 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 adjust men t w ei g ht
(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, bala nc e
will return into weighing mode automatically.
22 KFB/KFN-TM-BA_IA-e-1624
6.11 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.
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-ver i fie d at reg ul ar 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-1624 23
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 verified
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
[K1]
24 KFB/KFN-TM-BA_IA-e-1624
KFN-TM:
Access to conductor plate:
• Remove seal
• Open display unit
• The application of the display unit as a weighing system able to be verified
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.
• To adjust, short-circuit the contacts of the circuit board, using a jumper [K2].
[K1]
[K2]
KFB/KFN-TM-BA_IA-e-1624 25
7 Operation
7.1 Start-up
Press and the instrument will carry out a self-test. As soon as the weight
display appears, the instrument will be ready to weigh.
7.2 Switching Off
Press and the display will disappear.
7.3 Zeroing
Resetting to zero corrects the influence of light soiling on the weighing plate. The unit
is equipped with an automatic zero setting function. Therefore the unit can be reset to
zero at any time as follows:
To unload the weighing system
Press and zero display as well as indicator ZERO will appear.
7.4 Simple weighing
Place goods to be weighed on balance.
Wait until stability display STABLE appears.
Read weighing result.
Overload warning
Overloading exceeding the stated maximum load (max) of the device, minus a
possibly existing tare load, must be strictly avoided. This could damage the
instrument.
Exceeding maximum load is indicated by the display of „----“ and an audio
sound. Unload weighing system or reduce preload.
26 KFB/KFN-TM-BA_IA-e-1624
7.5 Switch-over weighing unit (only not verifiable weighing systems)
How to enable weighing units:
Call-up menu item P5 Unt, see chap. 8.1
Press and the first weighing unit with the current setting
will be displayed.
To enable [on] / disable [off] the displayed weighing unit,
press
Acknowledge with . The next unit with the current setting
will be displayed.
To enable [off] / disable [on] the displayed weighing unit,
press .
Acknowledge with .
Repeat sequence for each weighing unit.
Note:
„tj“ and „Hj“ cannot be activated at the same time, only either
... or ... .
Return to weighing mode using
Switch-over weighing unit:
Keep pressed, the display changes over to the
weighing units activated before (e.g. kg lb)
KFB/KFN-TM-BA_IA-e-1624 27
7.6 Weighing with tare
Deposit weighing vessel. After successful standstill control press the button.
Zero display and indicator NET appear.
The weight of the container is now internally saved.
Weigh the material, the net weight will be indicated.
The weight of the weighing container will be displayed as a minus number after
removing the weighing container.
The tare procedure can be repeated as many times as necessary, for example
with initial weighing of several components for a mix (add-on weighing). The limit
is reached when the taring range capacity (see type plate)is full.
To change between gross weight and net weight, press .
To delete the tare value, remove load from weighing plate and press .
28 KFB/KFN-TM-BA_IA-e-1624
7.7 Weighing with tolerance range
You can set an upper or lower limit when weighing with tolerance range and thus
ensure that the weighed load remains exactly within the set limits.
During tolerance tests such as dosing, portioning and sorting the unit will indicate
exceeded or undershot limits by emitting an optical or acoustic signal.
Audio signal:
The acoustic signal depends on the settings in menu block „BEEP“.
Options:
• no
Acoustic signal turned off
• ok
An acoustic signal sounds when load is within tolerance
limits
• ng
An acoustic signal sounds when load is beyond tolerance
limits
Optical signal:
Three colour signal lights indicate whether the load is within the two tolerance limits.
The signal lights provide the following information:
+
Goods to be weighed above tolerance limit
Red signal light
glowing
Goods to be weighed within tolerance range
Green signal light
glowing
-
Goods to be weighed below tolerance limit
Red signal light
glowing
The settings for tolerance weighing may be called up either via menu block „P0 CHK“
(see chap. 8) or faster via the key combination
KFB/KFN-TM-BA_IA-e-1624 29
7.7.1 Tolerance check for target weight
Settings
Press and at the same time in weighing mode.
Press until the display for entering the lower limit value
appears.
Press , the current setting will be displayed.
To enter the lower limit, e. g. 1000 Kg, press the navigation
keys (See chap. 2.1.1); the currently enabled digit will be
flashing.
Confirm input by .
Press repeatedly until is displayed.
Press , the current setting for the upper limit will be
displayed.
Press the navigation keys (See chap. 2.1.1) to enter the
upper limit, e.g. 1,100 kg; the currently enabled digit will be
flashing.
Confirm input by .
Press repeatedly until is displayed.
Press
and the current setting for the acoustic signal will
be shown.
Select desired setting (no, ok, ng) by .
Confirm input by .
30 KFB/KFN-TM-BA_IA-e-1624
Press ; weighing system is in tolerance weighing mode.
From here evaluation takes place whether the goods to be
weighed are within the two tolerance limits.
Weighing with tolerance range
Tare when using a weighing container.
Put on goods to be weighed, tolerance control is started. The signal lights
indicate whether the load is within the two set limits.
Load below specified
tolerance
Load within specified
tolerance
Load exceeds specified
tolerance
Red signal light
next to „-“ ON illuminated
Green signal light
next to „„ illuminated
Red signal light
next to „+“ ON illuminated
• The tolerance control is not active when the weight is under 20d.
• To delete limits, enter “00.000 kg“.
KFB/KFN-TM-BA_IA-e-1624 31
7.7.2 Tolerance check for target quantity
Settings
Press and at the same time in weighing mode.
Press until the display for entering the lower limit value
appears.
Press , the current setting will be displayed.
To enter the lower limit, e. g. 75 items, press the navigation
buttons (see chap. 2.1.1); the currently enabled digit will be
flashing.
Confirm input by .
Press repeatedly until is displayed.
Press , the current setting for the upper limit will be
displayed.
To enter the upper limit, e. g. 100 items, press the navigation
buttons (see chap. 2.1.1); the currently enabled digit will be
flashing.
Confirm input by .
Press repeatedly until is displayed.
Press
and the current setting for the acoustic signal will
be shown.
Select desired setting (no, ok, ng) by .
Confirm input by .
32 KFB/KFN-TM-BA_IA-e-1624
Press ; weighing system is in tolerance weighing mode.
From here evaluation takes place whether the goods to be
weighed are within the two tolerance limits.
Weighing with tolerance range
Set item weight, see chap. 7.10.
Tare when using a weighing container.
Put on goods to be weighed, tolerance control is started. The signal lights
indicate whether the load is within the two set limits.
Load below specified
tolerance
Load within specified
tolerance
Load exceeds specified
tolerance
Red signal light
next to „-“ ON illuminated
Green signal light
next to „„ illuminated
Red signal light
next to „+“ ON illuminated
• The tolerance control is not active when the weight is under 20d.
• To delete limits, enter „00000 PCS“.
KFB/KFN-TM-BA_IA-e-1624 33
7.8 Manual totalizing
With this function the individual weighing values are added into the summation
memory by pressing and edited, when an optional printer is connected.
• Menu setting:
„P1 COM“ or „P2 COM“ „MODE“ „PR2““, see chap. 8
• The totalizing function is not active when the weight is under 20d.
Add up:
Place weighing goods A.
Wait until the stability display STABLE appears, then press . The weight value
will be saved and printed if an optional printer is connected.
Remove the weighed good. More weighed goods can only be added when the
display ≤ zero.
Place goods to be weighed B.
Wait until the stability display appears, then press . Weighing value will be
added to summation memory and possibly printed.
The number of weighing actions, followed by the total weight will be displayed for
2 sec.
Add more weighed goods as described befor e.
Please note that the weighing system must be unloaded between the individual
weighing procedures.
This process may be repeated 99 times or till such time as the capacity of the
weighing system has been exhausted.
Display and output sum „Total“:
Press , number of weighing, followed by the total weight will be displayed for
2 sec. Press to print out this display.
34 KFB/KFN-TM-BA_IA-e-1624
Delete weighing data:
Press and at the same time The data in the summation memory are
deleted.
Printout example KERN YKB-01N, verified weighing system:
Menu setting
„P1 COM“ or „P2 COM“ „Lab 2“ / Prt 7“
Menu setting
„P1 COM“ or „P2 COM“ „Lab 0“ / Prt 0“
1 First weighing
2 Second weighing
3 Third weighing
4 Number of weighings / total
+
KFB/KFN-TM-BA_IA-e-1624 35
7.9 Automatic adding-up
With this function the individual weighing values are automatically added into the
summation memory when the bala nc e is unloaded without pressin g and edited,
when an optional printer is connected.
• Menu settings:
„P1 COM“ or „P2 COM „MODE“ „AUTO““, see chap. 8
Der Indikator AUTO wird angezeigt.
Add up:
Place weighing goods A.
After the standstill control sounds a signal tone. The weighing value will be added
to the summation memory and printed.
Remove the weighed good. More weighed goods can only be added when the
display ≤ zero.
Place goods to be weighed B.
After the standstill control sounds a signal tone. The weighing value will be added
to the summation memory and printed. Number of weighing, followed by the total
weight will be displayed for 2 sec.
Add more weighed goods as described before.
Please note that the weighing system must be unloaded between the individual
weighing procedures.
This process may be repeated 99 times or till such time as the capacity of the
weighing system has been exhausted.
Display and delete the weighing data, as well as printout examples see chap.
7.8.
36 KFB/KFN-TM-BA_IA-e-1624
7.10 Parts counting
Before the balance can count parts, it must know the average part weight (i.e.
reference). Proceed by putting on a certain number of the parts to be counted. The
balance determines the total weight and divides it by the number of parts, the socalled reference quantity. Counting is then carried out on the basis of the calculated
average piece weight.
As a rule:
The higher the reference quantity the higher the counting exactness.
In weighing mode , press and hold until the message „P
10“ appears that is used to set the reference quantity.
Use to set the desired reference quantity (such as 100),
options include P 10, P 20, P 50, P100, P 200.
Place as many items to be counted (such as 100 items) as
demanded by the set reference quantity and confirm by
The weighing scales calculate the reference weight. The
current quantity (such as 100 items) will be displayed.
Remove reference weight. The balance is from now in parts
counting mode counting all units on the weighing plate.
Back to Weighing mode by .
KFB/KFN-TM-BA_IA-e-1624 37
7.11 Animal weighing
The animal weighing function is suitable for weighing restless loads.
The weighing system will display a mean value derived from several weighing results.
The animal weighing program can be enabled by either calling up menu block
„P3 OTH“ or „P4 OTH“ „ANM“ „ON“ (See chap. 8) or faster via key combination.
The indicator shows HOLD as long as the animal weighing function remains enabled.
Place the load on the weighing system and wait until the scale is steady.
Press and at the same time; you will hear an acoustic signal, indicating
that the animal weighing function is enabled.
Whilst averaging is taking place you can add or remove loads as the measuring
value will be constantly updated.
To deactivate the animal weighing function press and at the same time.
38 KFB/KFN-TM-BA_IA-e-1624
7.12 Lock keyboard
To enable/disable the keyboard lock go to menu item „P3 OTH“ or „P4 OTH“
„LOCK“, see chap.8.
Whilst the function is enabled the keyboard will self-lock after no key has been
pressed for 10 minutes. „K-LCK“ will be displayed as soon as a key is pressed.
To disable the lock, press , and hold plus (2 s) until „U LCK“ appears.
7.13 Display background illumination
Keep pressed (3s) until „setbl“ appears.
Press again, the current setting will be displayed.
Use to select the desired setting.
Either save by or cancel by pressing .
Back to weighing mode by .
bl on Continuous back g r oun d lig ht ing
bl off Background illumination off
bl Auto Automatic background illumination on when weighing pate is
loaded or key pressed.
KFB/KFN-TM-BA_IA-e-1624 39
7.14 Automatic switch-off function „AUTO OFF“
The unit is automatically switched off within the preset time when the display unit or
the weighing bridge are not operated.
Keep pressed (3s) until „setbl“ appears.
Press to call up AUTO OFF-function
Press , the current setting will be displayed.
Use to select the desired setting.
of 0 AUTO OFF - function disabled
of 3 Weighing system wil l be turned off after 3 mi n .
of 5 Weighing system will be turned off after 5 min.
of 15 Weighing system will be turned off after 15 mi n.
of 30 Weighing system will be turned off after 30 mi n.
Either save by or cancel by pressing .
Back to weighing mode by .
40 KFB/KFN-TM-BA_IA-e-1624
8 Menu
The application of the display unit as a verified weighing system requires that you
short-circuit the two contacts [K1] of the circuit board, using a jumper. To that effect,
a menu for verified weighing systems is available. For menu layout see chap. 8.2.
There is no jumper for weighing systems that cannot be verified. To that effect, a
menu is available for weighing systems that cannot be verified, Menu layout
see chap. 8.1
Navigation in the menu:
Call up menu
Switch-on balance and during the selftest press .
Press , , subsequently, the first menu
block „PO CHK“ will be displayed.
Select menu block
With help of , the individual menu items can be
selected one after the other.
Select setting
Confirm selected menu item by pressing . The
current setting will be displayed.
Change settings
To change to the available settings, press the
navigations keys as described in chap. 2.1.
Acknowledge setting /
exit the menu
Either save by pressing or cancel by pressing .
Return to weighing
mode
Press repeatedly to exit menu.
KFB/KFN-TM-BA_IA-e-1624 41
8.1 Overview non verifiable weighing systems
(contacts of circuit board [K1] not short-circuited)
Menu block
Main menu
Menu item
Submenu
Available settings / explanation
PO CHK
Weighing with
tolerance range,
see chap. 7.7
nEt H Upper limit value „Tolerance check weighing“, input see
chap. 7.7.1
nEt LO Lower limit value „Tolerance check weighing“, input see
chap. 7.7.1
PCS H Upper limit value „Tolerance check counting“, input see
chap. 7.7.2
PCS L Lower limit value „Tolerance check counting“, input see
chap. 7.7.2
BEEP no
Acoustic signal for weighing with tolerance range
switched off
ok Audio sound when load is within tolerance limits
nG Audio sound when load is beyond tolerance limits
P1 REF
Zero point
settings
A2n0 Automatic zero point correction (Autozero) by changing the
display, digits selectable (0.5d, 1d, 2d, 4d)
0AUto Zero setting range
Load range where the display after switching-on the
balance is set to zero.
Selectable 0, 2, 5, 10, 20, 30, 50, 100 %
0rAGE Zero setting range
Load range where the display is set to zero by pressing
. Selectable 0, 2, 4, 10 , 20* , 50, 100%.
0tArE Autom atic t aring „on / off“, taring range adjustable in menu
item „0Auto“.
SPEEd Not documented
Zero Zero point setting
P2 COM
Interface
parameter
MODE
CONT
S0 off
Continuous data output,
selectable “send zero” yes / no
S0 on
ST1
One output for stable weighing value
STC
Continuous data output of stable weighing
values
PR1
Output after pressing
PR2
Manual totalizing, see chap. 7.8.
Press and the weighing value will be
added to the summation memory and issued.
42 KFB/KFN-TM-BA_IA-e-1624
AUTO*
For automatic add-up see chap. 7.9.
This function is used to issue and add individual
weighing values automatically to the summation
memory on unloading of weighing scale.
ASK
For remote control commands, see chap. 10.4
wirel
Not documented
BAUD
Available Baudrate: 600, 1200, 2400, 4800, 9600*
Pr
7E1
7 bits, even parity
7o1
7 bits, odd parity
8n1*
8 bits, no parity
PTYPE
tPUP*
Standard printer settin g
LP50
Not documented
Lab
Lab x
For data output format, see chap.8.2, tab. 1
Prt
Prt x
LAnG
eng*
Standard settings English
chn
P3 CAL
Configuration
data
see chap. 12.4
COUNT
Display internal resolution
DECI
Position of the decimal dot
DUAL
Setting balance type, capacity (Max) and readability (d)
off
Single-range balance
R1 inc
Readability
R1 cap
Capacity
on
Dual range balance
R1 inc
Readability 1st weighing range
R1 cap
Capacity 1st weighing range
R2 inc
Readability 2nd weighing range
R2 cap
Capacity 2nd weighing range
CAL
noLin
For adjustment, see chap. 6.9.2
Liner
For linearization, see chap. 6.10.2
GrA
Not documented
P4 OTH
LOCK
on
Keyboard lock enabled, see chap. 7.11
off*
Keyboard lock disable d
ANM
on
Animal weighing enabled, see chap. 7.10
off*
Animal weighing disabled
KFB/KFN-TM-BA_IA-e-1624 43
P5 Unt
Switch-over
weighing unit,
see chap. 7.5
kg
on* off
g on off*
lb
on off*
oz
on off*
tJ
on off
HJ
on off
P6 xcl Not documented
P7 rst
Use to reset balance settings to factory default.
P8 uwb Not documented
Factory settings are marked by *.
44 KFB/KFN-TM-BA_IA-e-1624
8.2 Overview verified weighing systems
(contacts of circuit board [K1] short-circuited by means of jumper)
In verified weighing systems the access to „P2 mode and „P4 tAr“ is locked.
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:
In order to unlock the access, the seal must be destroyed and both contacts of the
printed circuit board [K2] must be s hor t-circuited by a jumper, see chap. 6.11.
Attention:
After destruction of the seal the weighing system 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.
Menu block
Main menu
Menu item
Submenu
Available settings / explanation
PO CHK
Weig hing with
tolerance range,
see chap. 7.7
nEt H Upper limit value „Tolerance check weighing“, input see
chap. 7.7.1
nEt LO Lower limit value „Tolerance check weighing“, input see
chap. 7.7.1
PCS H Upper limit value „Tolerance check counting“, input see
chap. 7.7.2
PCS L Lower limit value „Tolerance check counting“, input see
chap. 7.7.2
BEEP
no
Acoustic signal for weighing with tolerance
range switched off
ok
Audio sound when load is within tolerance
limits
ng
Audio sound when load is beyond tolerance
limits
P1 COM
Interface
parameter
MODE
CONT
S0 off
Continuous data output,
selectable “send zero” yes / no
S0 on
ST1
One output for stable weighing value
STC
Continuous data output of stable weighing
values
PR1
Output after pressing
PR2
Manual totalizing, see chap. 7.8
Press and the weighing value will be
added to the summation memory and issued.
AUTO
For automatic totalizing see chap. 7.9
This function is used to issue and add
individual weighing values automatically to the
summation memory on unloading of weighing
scale.
KFB/KFN-TM-BA_IA-e-1624 45
ASK
For remote control commands, see chap. 10.4
wireless
Not documented
baud
Available Baudrate: 600, 1200, 2400, 4800, 9600
Pr
7E1
7 bits, even parity
7o1
7 bits, odd parity
8n1
8 bits, no parity
PtYPE
tPUP
Standard printer setting
LP50
Not documented
Lab
Lab x
Details see following table 1
Prt
Prt x
Lang
Eng*
Standard setting English
Chn
P2 mode
Konfigurationsdaten
SiGr
Single-range balance
COUNT
Display internal resolution
DECI
Position of the decimal dot
Div.
Readability [d] / verification value[s]
CAP
Balance capacity [Max]
CAL
noLin
Adjustment, see chap. 6.9
LinEr
Linearisation, see chap. 6.10
GrA
Not documented
dUAL 1
Dual range balance
Balance with two weighing ranges and different maximum load
and weighing ranges and interval sizes but only one loadsupporting pan, whereby each range extends from zero to the
respective maximum capacity. When load is removed, weighing
scales will remain in 2nd range.
COUNT
Display internal resolution
DECI
Position of the decimal dot
div.
div 1
Readability [d] / verification value [e]
1. weighing range
div 2
Readability [d] / verification value [e]
2. weighing range
CAP
CAP 1
Weighing scale capacity [max]
1. Weighing range
CAP 2
Weighing scale capacity [max]
2. Weighing range
CAL
noLin
Adjustment, see chap. 6.9
LinEr
For linearization, see chap. 6.10
GrA
Not documented
46 KFB/KFN-TM-BA_IA-e-1624
dUAL 2
Multi-interval balance
Weighing scales with one weighing ra nge su bd ivid ed into partial
weighing ranges, each providing a different scale interval. The
scale interval depends on the applied load and is automatically
changed during loading and unloading.
COUNT
Display internal resolution
DECI
Position of the decimal dot
div.
div 1
Readability [d] / verification value [e]
1. weighing range
div 2
Readability [d] / verification value [e]
2. weighing range
CAP
CAP 1
Weighing scale capacity [max]
1. Weighing range
CAP 2
Weighing scale capacity [max]
2. Weighing range
CAL
noLin
Adjustment, see chap. 0
LinEr
Linearisation, see chap. 6.10
GrA
Not documented
P3 OTH
s. Kap. 7.10 / 7.11
LOCK
on
Keyboard lock enabled
off
Keyboard lock disabled
ANM
on
Animal weighing enabled
off
Animal weighing disabled
P4 tAr
Restricted taring
range
Press , the current setting will be displayed. Using the
navigation buttons (see chap. 2.1.1) select the desired setting, the
active digit is flashing.
Confirm input by .
P5 St
Follow up tare
St on
Follow up tare switched on
St off
Follow up tare switched off
P6 SP
7.5, 15, 30
Not documented
Tab. 1. Printout examples Standard printer
Lab
Prt
0 1 2 3
0~3
*******************
GS: 5.000kg
*******************
*******************
NT: 5.000kg
TW: 5.000kg
GW: 10.000kg
*******************
**********************
GS: 5.000kg
TOTAL: 10.000kg
**********************
**********************
NT: 5.000kg
TW: 5.000kg
GW: 10.000kg
TOTAL: 10.000kg
**********************
4~7
*******************
No.: 1
GS: 5.000kg
*******************
*******************
No.: 1
NT: 5.000kg
TW: 5.000kg
GW: 10.000kg
*******************
**********************
No.: 1
GS: 5.000kg
TOTAL: 10.000kg
**********************
**********************
No.: 1
NT: 5.000kg
TW: 5.000kg
GW: 10.000kg
TOTAL: 10.000kg
**********************
GS / GW
Gross weight
NO
Number weighing processes
NT
Net weight
TOTAL
Total of all individual weighings
TW
Tare weight
KFB/KFN-TM-BA_IA-e-1624 47
9 Service, maintenance, disposal
9.1 Clean
• Before cleaning, disconnect the appliance from the operating voltage.
• Do not use aggressive detergents (solvents or similar).
9.2 Service, maintenance
The appliance may only be opened by trained service technicians who are authorized
by KERN.
Before opening, disconnect from power supply.
9.3 Disposal
Disposal of packaging and appliance must be carried out by operator according to
valid national or regional law of the location where the appliance is used.
9.4 Error messages
Error
message
Description Possible causes
- - - - -
Maximum load exceeded
• Unload weighing system or reduce
preload.
- - ol - -
Err 1
Incorrect data input
• Follow format “yy:mm:dd“
Err 2
Incorrect time entry
• Follow format “hh:mm:ss“
Err 4 Zeroing range exceeded due
to switching-on balance or
pressing (normally 4%
max)
• Object on the weighing plate
• Overload when zeroing
Err 5 Keyboard error
Err 6
Value outside the A/D changer
range
• Weighing plate not installed
• Damaged weighing cell
• Damaged electronics
Err 9 Stability display does not
appear
• Check the environmental
conditions.
48 KFB/KFN-TM-BA_IA-e-1624
Err 10 Communication error
• No data
Err 15 Gravitation error
• Range 0.9 ~ 1.0
Err 17 Taring range exceeded
• Reduce load
Fai l h /
Fai l l
Adjustment error
• Repeat adjustment.
Err P
Printer error
• Check communication paramet ers
Ba lo /
Lo ba
Battery very low
• Recharge battery
Should other error messages occur, switch balance off and then on again. I f the err or
message remains inform manufacturer.
KFB/KFN-TM-BA_IA-e-1624 49
10 Data out put RS 2 32C
You can print weighing data automatically via the RS 232C interface or manually by
pressing via the interface according to the setting in the menu.
This data exchange is asynchronous using ASCII - Code.
The following conditions must be met to provide successful communication between
the weighing system and the printer.
• Use a suitable cable to connect the display unit to the interface of the printer.
Faultless operation requires an adequate KERN interface cable.
• Communica ti on parameters (baud rate, bits and parity) of display unit and
printer must match. For a detailed description of interface parameters see
chap. 8, menu block „P1 COM“ or ‚“P2 COM“
10.1 Technical data
Connection 9 pin d-subminiature bushing
Pin 2 input
Pin 3 output
Pin 5 signal earth
Baud rate Optional 600/1200/2400/4800/9600
Parity 8 bits, no parity / 7 bits, even parity / 7 bits, odd parity
10.2 Printer mode
Printout examples (KERN YKB-01N):
• Weighing
ST, GS 1.000kg
50 KFB/KFN-TM-BA_IA-e-1624
Symbols:
ST
Stable value
US
Instable value
GS / GW
Gross weight
NT
Net weight
TW
Tare weight
NO
Number weighing processes
TOTAL
Total of all individual weighings
<lf>
Space line
<lf>
Space line
• Counting
10.3 Output log (continuous output)
• Weighing
HEADER1: ST=STABLE， US=UNSTABLE
HEADER2: NT=NET， GS=GROSS
10.4 Remote control instructions
Command Function Printout examples
S Stable weighing value for the weight is
sent via the RS232 interface
ST,GS 1.000KG
W Weig hi ng v al ue for the weight (stable or
unstable) is sent via the RS232 interface
US,GS 1.342KG
ST,GS 1.000KG
T No data are sent, the balance carries out
the tare function.
-
Z No data are sent, the zero-display
appears.
-
P Quantity will be sent via the RS232-
interface
10PCS
****************************
PCS 100
****************************
KFB/KFN-TM-BA_IA-e-1624 51
11 I ns t a nt hel p
In case of an error in the program process, briefly turn off the display unit and
disconnect from power supply. The weighing process must then be restarted from the
beginning.
Help:
Fault Possible cause
The displayed weight does
not glow.
• The display unit is not switched on.
• Mains power supply interrupted (mains cable
defective).
• Power supply interrupted.
• (Rechargeable) batteries are inserted incorrectly or
empty
• No (rechargeable) batteries inserted.
The displayed weight is
permanently changing
• Draught/air movement
• Table/floor vibrations
• Weighing pan has contact with other objects.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
The weighing result is
obviously incorrect
• The display of the balance is not at zero
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Warm-up time was ignored.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
Should other error messages occur, switch display unit off and then on again. If the
error message remains inform manufacturer.
52 KFB/KFN-TM-BA_IA-e-1624
12 I ns t a lling display unit / weighing bridge
• Installation / configuration of a weighing system must be carried out
by a well acquainted specialist with the workings of weighing
balances.
12.1 Technical data
Supply voltage: 5 V/150mA
Max. signal voltage 0-10 mV
Zeroing range 0-2 mV
Sensitivity 2-3 mV/V
Resistance parameter 80 - 100 Ω, max 4 items per 350 Ω load cell
12.2 Weighing system design
The display unit is suitable for connection to any analogue platform in compliance
with the required specifications.
The following data must be established before selecting a weighing cell:
• Weighing balance capacity
This usually corresponds to the heaviest load to be weighed.
• Preload
This corresponds to the total weight of all parts that are to be placed on the
weighing cell such as upper part of platform, weighing pan etc.
• Total zero setting range
This is composed of the start-up zero setting range (± 2%) and the zero
setting range available to the user via the ZERO-key (2%). The total zero
setting range equals therefore 4 % of the scale’s capacity.
The addition of weighing scales capacity, preload and the total zero setting
range give the required capacity for the weighing cell.
To avoid overloading of the weighing cell, include an additional safety
margin.
• Smallest desired display division
• Verifiability, if required
The application of the display unit as a verified weighing system requires
that you short-circuit the two contacts [K1] of the circuit board, using a
jumper; for position see chap. 6.11.
Remove the jumper for weighing systems not able to be verified.
KFB/KFN-TM-BA_IA-e-1624 53
12.3 How to connect the platform
Disconnect the display unit from the power supply.
Solder the individual leads of the load cell cable onto the circuit board. See
diagrams below.
PIN
Loadcell
6- conductor
4- conductor
7
EXC+
EXC+
6
SEN+
5
EXC-
EXC-
4
SEN-
3
SHIELD
SHIELD
2
SIG-
SIG-
1
SIG+
SIG+
EXC+
SEN+
SEN-
EXC-
SIG+
SIG-
SHIELD
7
6
3
2
5
4
1
LOAD
CELL
54 KFB/KFN-TM-BA_IA-e-1624
12.4 Configure display unit
12.4.1 Verified weighing systems
(contacts of circuit board [K1] short-circuited by means of jumper)
For menu overview see chap. 8.2.
In verified weighing systems the menu item for calibration „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-verified by an
authorised agency and a new verification wire/seal mark fitted before it can be
reused for applications subject to verification.
Call up menu:
Switch-on balance and during the selftest press .
Press , , subsequently, the first menu block
„PO CHK“ will be displayed.
Press repeatedly until „P2 mode“ will be displayed.
Operate the adjustment switch (models KFB-TM).
Press and use to select the weighing scales type.
Single-range balance
Dual range balance
Multi-interval balance
KFB/KFN-TM-BA_IA-e-1624 55
Example single range scales (d = 10 g, max. 30 kg)
Confirm selected weighing scales type by pressing ; the
first menu item „COUNT“ will be shown.
1. Display internal resolution
Press , the internal resolution will be shown.
Return to menu by .
Press to select the next menu item.
2. Position decimal point
Press , the currently set position of the decimal dot is
displayed.
Press to select the desired setting.
Options 0, 0.0, 0.00, 0.000, 0.0000.
Confirm input by .
Press to select the next menu item.
3. Readability
Press and current setting will be displayed.
Select desired setting by .
Options 1, 2, 5, 10, 20, 50.
Confirm entry by .
Press to select the next menu item.
56 KFB/KFN-TM-BA_IA-e-1624
4. Capacity
Press , the current setting will be displayed.
Using the navigation buttons (see chap. 2.1.1) select the
desired setting, the active digit is flashing.
Confirm input by .
Press to select the next menu item.
5. Adjustment / linearization
Adjustment or linearization is required after entering
configuration data.
For carrying out adjustment see chap. 6.9.1/step 6 or chap.
6.10.1 for linearisation
KFB/KFN-TM-BA_IA-e-1624 57
Example dual range scales (d = 2 / 5 g, max. 6 / 15 kg)
Confirm selected weighing scales type by ; the first
menu item „COUNT“ will be shown.
1. Display internal resolution
Press , the internal resolution will be shown.
Return to menu by .
Press to select the next menu item.
2. Position decimal point
Press , the currently set position of the decimal dot is
displayed.
Use to select the desired setting.
Options 0, 0.0, 0.00, 0.000, 0.0000.
Confirm input by .
Press to select the next menu item.
58 KFB/KFN-TM-BA_IA-e-1624
3. Readability
Press , the display used to enter readability/verification
value for first weighing range will appear.
Press , the current setting will be displayed.
Select desired setting with and acknowledge by .
Press to enter the next menu item for
readability/verification value for second weighing range.
Press and current setting will be displayed.
Select desired setting w it h and acknowledge by .
Press , the unit will return to the menu
Press to select the next menu item.
KFB/KFN-TM-BA_IA-e-1624 59
4. Capacity
Press and the display for entering the capacity for the
first weighing range will appear.
Press and current setting will be displayed.
Select desired setting with and acknowledge by .
Press to select the next menu item used to enter the
capacity for the second weighing range.
Press and current setting will be displayed.
Select desired setting with and acknowledge by .
Press , the unit will return to the menu
Use toselect next menu item.
5. Adjustment / linearization
Adjustment or linearization is required after entering
configuration data.
For carrying out adjustment see chap. 6.9.1/step 6 or chap.
6.10.1 for linearisation
Acknowledge using , the current setting is displayed.
Acknowledge by , select desired setting with
= Adjustment
= Linearisation
60 KFB/KFN-TM-BA_IA-e-1624
12.4.2 Non verifiable weighing systems
(contacts of circuit board [K1] not short-circuited )
+ For menu overview see chap. 8.1.
Call up menu
Switch-on balance and during the selftest press .
Press , , subsequently , the first menu block
„PO CHK“ will be displayed.
Press repeatedly until „CAL“ will be displayed.
Press , the first menu item „COUNT“ will be displayed.
Navigation in the menu
With help of , the individual menu items can be
selected one after the other.
Confirm selected menu item by pressing . The current
setting will be displayed.
To change to the available settings, press the navigations
keys as described in chap. 2.1.1.
Either save by pressing or cancel by pressing .
Press repeatedly to exit menu.
KFB/KFN-TM-BA_IA-e-1624 61
Parameter selection
1. Display internal resolution
Press , the internal resolution will be shown.
Return to menu by .
Use to select another menu item.
2. Position decimal point
Press , the currently set position of the decimal dot is
displayed.
To make changes using the navigation keys (See chap.
2.1.1), select the desired setting. Options 0, 0.0, 0.00,
0.000, 0.0000.
Confirm input by .
Use to select another menu item.
3. Weighing scales type, capacity and readability
Press and current setting will be displayed.
Select desired setting by .
„off“ Single-range balance
„on“ Dual range balance
Press to confirm, the display for entering readability (for
dual range scales for the first weighing range) appears.
Press , the current setting will be displayed.
62 KFB/KFN-TM-BA_IA-e-1624
Select desired setting with and acknowledge by .
Press , the display for entering capacity will appear (at
dual range balance for the first ra ng e) .
Press , the current setting will be shown (such as max. =
2000kg).
Using the navigation buttons (see chap. 2.1.1) select the
desired setting, the active digit is flashing.
Acknowledge with .
In a single-range balance the entry of capacity / readability
is finished.
either in single-range balance
Press , the unit will return to the menu Press to call
up next menu item „CAL“.
or
In a dual range balance enter readability/verification value
and capacity of the second weighing range.
Press , the display for entering the capacity of the
second weighing range will appear.
Press , the current setting will be displayed.
Using the navigation buttons (see chap. 2.1.1) select the
desired setting, the active digit is flashing.
Confirm input by .
KFB/KFN-TM-BA_IA-e-1624 63
Press , the display for entering the readability of the
second weighing range will appear.
Press , the current setting will be displayed.
Select desired setting w it h and acknowledge by .
Press , the unit will return to the menu
Press to call next menu item.
4. Adjustment or linearisation
Adjustment or linearisation is required after entering
configuration data.
For carrying out adjustment see chap. 6.9.2/step 4 or chap.
6.10.2 for linearisation
Acknowledge using , the current setting is displayed.
Press to confirm, press to select the desired
setting
noLin = Adjustment
LineAr = Linearisation
64 KFB/KFN-TM-BA_IA-e-1624
13 Dec laration of Conformity / Tes t Ce rt ificate
To view the current EC/EU Declaration of Conformity go to:
www.kern-sohn.com/ce
•
The scope of delivery for verified weighing balances (=
conformity-
rated weighing balances) includes a Declaration of
Conformity.
DELTA
Danish Electronics,
Light & Acoustics
Venlighedsvej 4
2970 Hørsholm
Denmark
Tel. (+45) 72 19 40 00
Fax (+45) 72 19 40 01
www.delta.dk
VAT No. DK 12275110
TEST CERTIFICATE
No. DK0199-R76-11.04
Instrument type KFN-TM / KFB-TM
Test item device Non-automatic Weighing Indicator
Issued by DELTA Danish Electronics, Light & Acoustics
EU - Notified Body No. 0199
In accordance with Paragraph 8.1 of the European Standard on metrological aspects
of non-automatic weighing instruments EN 45501:1992.
Fractional factor (pi) 0.5 (refer to 3.5.4 of the standard).
Issued to Kern & Sohn GmbH
Ziegelei 1
D 72336 Balingen-Frommern
GERMANY
Manufacturer Kern & Sohn GmbH
In respect of A family of indicators tested as a module of a weighing instrument.
Characteristics Suitable as a non-automatic weighing instrument with the following
characteristics:
Self indicating with single-interval, multi-interval or
multi-range
Accuracy class III or IIII
Verification scale interval: e
i
= Maxi/ni
Maximum number of
verification scale intervals: n = 6000 for single-interval
n = 2×3000 for multi-interval and
multi-range,
however limited to 1000 for Class IIII
Min. input voltage per VSI: 1 µV
The essential characteristics are described in the annex.
Description and The A/D device is described and documented in the annex to
documentation this certificate.
Remarks Summary of tests involved: See test report no. DANAK-
1910568, DANAK-1910388 and NMi 709226.
This test certificate cannot be quoted in an EU type approval certificate without permission from the holder of the certificate mentioned above.
The annex comprises 7 pages.
Issued on 2011-03-16 Signatory: J. Hovgård
Annex page 1 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
1. Name and type of instrument
The indicators KFN-TM / KFB-TM are a family of weighing indicators suitable to be incorporated in
non-automatic weighing instruments, class III or class IIII, with single-interval, multi-interval or
multi-range.
2. Description of the construction and function
2.1 Construction
The electronic indicator consists of a single circuit board, SMD populated on both sides as the A/Dinterface circuits, the microprocessor and the voltage regulation are placed on one side and the LCD
display on the other side.
The LCD-display has indication for: Stable, zero, gross, net, tare, and weight unit (kg, g, t), and 5½
digits with a height of 52 mm.
The enclosure is made of stainless steel for the KFN-TM indicator or of ABS plastics for KFB-TM.
The front of the enclosure has an on/off key plus 6 keys for operating the functions of the indicator.
All instrument calibration and metrological setup data are stored in the non-volatile memory.
The indicators are power supplied with 9 - 12 VDC - normally supplied by external 230 VAC to
9 - 12 VDC adapter. An optional internal battery can be factory installed.
As part of the indicators EMC protection ferrites shall be placed as follows:
• Externally around the DC supply cable near its connection to the indicator (min. 1 turn).
• Internal on cable between power plug and main board (4 turns).
• Internal on cable between load cell connector and main board (min. 2 turns).
Software
The software version is displayed during the start-up of the indicator.
The tested software version is 1.07.
Sealing
The configuration and calibration data can only be changed if the calibration jumper is installed on
the circuit board.
2.2 Function
The devices are a microprocessor based electronic weighing indicators for connection of strain gauge
load cells.
List of devices:
• Self test
• Determination and indication of stable equilibrium
• Initial zero-setting ± 10% of Max
• Semi-automatic zero-setting ± 2% of Max
• Automatic zero-tracking ± 2% of Max
Annex page 2 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
•
Indication of zero
• Semi-automatic subtractive tare
• Acting upon significant fault
• Weighing unstable samples
• Real time clock (optional)
3. Technical data
3.1 Indicator
Type KFN-TM / KFB-TM
Accuracy class III or IIII
Weighing range Single-interval, multi-interval or multi-range
Maximum number of verification scale intervals (n) 6000 for single-interval
2×3000 for multi-interval and multi-range,
however limited to 1000 for Class IIII
Minimum input voltage per VSI 1 µV
Maximum capacity of interval or range (Max
i
): ni × ei
Verification scale interval, e
i
= Maxi / ni
Initial zero-setting range: ± 10 % of Max
Maximum tare effect: 100 % of Max
Fractional factor (pi) 0.5
Excitation voltage 5 VDC
Circuit for remote sense Active, (see below)
Minimum input impedance 87 ohm
Maximum input impedance 1600 ohm
Connecting cable to load cell(s): See Section 3.1.1
Supply voltage: 9 - 12 VDC
230 VAC using external Vac/2Vdc adapter
Operating temperature range Min / Max = -10 °C / +40 °C
Peripheral interface(s) See Section 4
3.1.1 Connecting cable between the indicator and the junction box for load cell(s),
if any
3.1.1.1 4-wire system
Line 4 wires, shielded
Maximum length The certified length of the load cell cable, which shall be con-
nected directly to the indicator.
3.1.1.2 6-wire system
Line 6 wires, shielded
Maximum length 227 m/mm
2
Maximum resistance per wire 3.8 ohm
Annex page 3 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
4. Interfaces
4.1 Load cell interface
Refer to section 3.1.1.
Any load cell(s) can be used for instruments under this certificate provided the following conditions
are met:
• There is a respective test certificate (EN 45501) or an OIML Certificate of Conformity (R60)
issued for the load cell by a Notified Body responsible for type examination under the
Directive 2009/23/EC.
• The certificate contains the load cell types and the necessary load cell data required for the
manufacturer’s declaration of compatibility of modules (WELMEC 2, Issue 5, 2009, section
11), and any particular installation requirements. A load cell marked NH is allowed only if
humidity testing to EN 45501 has been performed.
• The compatibility of load cells and indicator is established by the manufacturer by means of
the compatibility of modules form, contained in the above WELMEC 2 document, or the like,
at the time of EC verification or declaration of EC conformity of type.
• The load transmission must conform to one of the examples shown in the WELMEC 2.4 Guide
for load cells.
4.2 Peripheral interfaces
The indicator may be equipped with one or more of the following protective interfaces that have not
to be secured.
• RS-232C
• Analogue output (0 - 10 V / 4 - 20 mA)
• Digital output
• Blue Tooth
The peripheral interfaces are characterised “Protective interfaces” according to paragraph 8.4 in the
Directive.
5. Conditions for use
Legal use of the indicator for automatic weighing or as counting device is not allowed with reference
to this test certificate.
Annex page 4 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
6. Location of seals and inscriptions
Seals shall bear the verification mark of a notified body or alternative mark of the manufacturer according to ANNEX II, section 2.3 of the Directive 2009/23/EC. The seals shall be placed so that the
enclosure can not be opened.
Location of CE mark of conformity:
The CE mark of conformity is placed on the overlay on the rear side of the device.
Inscription on the overlay:
Type, accuracy class, Temp. -10 °C / +40 °C, Certificate No. DK0199-R76-11.04.
Other inscriptions on the overlay:
Manufacturer’s name and/or logo, Part No, Supply voltage.
7. Tests
The indicator has been tested according to EN 45501 and WELMEC 2.1 Guide for testing
of indicators.
Examination / tests
Temperature tests: 20 / 40 / -10 / 5 / 20 (tested at minimum input-voltage sensitivity)
Temperature effect on no-load indication (tested at minimum input-voltage sensitivity)
Stability of equilibrium
Repeatability
Warm-up time
Voltage variations
Short time power reductions
Electrical bursts
Electrostatic discharges
Immunity to radiated electromagnetic fields
Damp heat, steady state
Span stability
Checklist
Maximum load cell cable length and impedance of cable to load cell
Load cell interface measurements with interruptions of the sense circuit
The test item fulfilled the maximum permissible errors at all tests.
Annex page 5 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
8. Documentation
Contents of the technical documentation held by the notified body:
8.1 Product specification
• Manuals and descriptions
• Drawings
• Etc.
8.2 Examination report
OIML R76 report no. DANAK-1910568, DANAK-1910388 and NMi 709226.
8.3 Test results
Report no. DANAK-1910568, DANAK-1910388 and NMi 709226.
Annex page 6 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
9. Pictures
Figure 1 Sealing of KFN-TM.
After remove the label, you will find VOID on housing, or
a self destroyable sticker/seal shall be used.
Annex page 7 of 7
Annex to Test Certificate No. DK0199-R76-11.04
Issued by DELTA
Figure 2 Sealing of KFB-TM.
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