KERN & SOHN KFN-TM User Manual

KERN & Sohn GmbH

Ziegelei 1

E-Mail: [e-mail]

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

2 KFB/KFN-TM-BA_IA-e-1323

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

+ / / -

8 KFB/KFN-TM-BA_IA-e-1323

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 modeCalCall 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 CALCalLiner , 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

[K1]

[K2]

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].

KFB/KFN-TM-BA_IA-e-1323 23

Overloading exceeding the stated maximum load (max) of the device, minus a

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

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.

24 KFB/KFN-TM-BA_IA-e-1323

7.5 Switch-over we i ghing 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-1323 25

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 .

26 KFB/KFN-TM-BA_IA-e-1323

An acoustic signal sounds when load is beyond tolerance



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

• ok

• ng

Optical signal:

Three colour signal lights indicate whether the load is within the two tolerance limits.
The signal lights provide the following information:

Acoustic signal turned off
An acoustic signal sounds when load is within tolerance

limits

limits

+

Goods to be weighed above tolerance limit

Goods to be weighed within tolerance range

Goods to be weighed below tolerance limit

-

Red signal light
glowing

Green signal light
glowing

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-1323 27

and the current setting for the acoustic signal will

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

be shown.

 Select desired setting (no, ok, ng) by .

 Confirm input by .

28 KFB/KFN-TM-BA_IA-e-1323

 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

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“.

Load within specified
tolerance

Green signal light

next to „„ illuminated

Load exceeds specified
tolerance

Red signal light

next to „+“ ON illuminated

KFB/KFN-TM-BA_IA-e-1323 29

Press and the current setting for the acoustic signal will

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.



be shown.

 Select desired setting (no, ok, ng) by .

 Confirm input by .

30 KFB/KFN-TM-BA_IA-e-1323

 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

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“.

Load within specified
tolerance

Green signal light

next to „„ illuminated

Load exceeds specified
tolerance

Red signal light

next to „+“ ON illuminated

KFB/KFN-TM-BA_IA-e-1323 31

• Menu setting:

• The totalizing function is not active when the weight is under 20d.

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.

„P1 COM“ or „P2 COM“  „MODE“  „PR2““, see chap. 8

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 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 output sum „Total“:

 Press , number of weighing, followed by the total weight will be displayed for

2 sec. Press to print out this display.

32 KFB/KFN-TM-BA_IA-e-1323

Menu setting

Menu setting

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:

„P1 COM“ or „P2 COM“  „Lab 2“ / Prt 7“

„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-1323 33

• Menu settings:

7.8.

7.9 Automatic adding-up

With this function the individual weighing values are automatically added into the
summation memory when the bala nce is unloaded without pressing and edited,

when an optional printer is connected.

„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.

34 KFB/KFN-TM-BA_IA-e-1323

7.10 Parts c ounti ng

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-1323 35

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.

36 KFB/KFN-TM-BA_IA-e-1323

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.

bl on Continu ous bac kg r oun d li g hti ng
bl off Background illumination off
bl Auto Automatic background illumination on when weighing pate is

loaded or key pressed.

 Either save by or cancel by pressing .

Back to weighing mode by .

KFB/KFN-TM-BA_IA-e-1323 37

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 wi l l be turned off a fter 3 min .
of 5 Weighing system wi l l be turned off a fter 5 min .
of 15 Weighing system will be turned off after 15 mi n.
of 30 Weighing system will be turned off after 30 min.

 Either save by or cancel by pressing .

Back to weighing mode by .

38 KFB/KFN-TM-BA_IA-e-1323

current setting will be displayed.

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

Select setting

Change settings

Acknowledge setting /
exit the menu

Return to weighing
mode

 With help of , the individual menu items can be

selected one after the other.

 Confirm selected menu item by pressing . The

 To change to the available settings, press the

navigations keys as described in chap. 2.1.

 Either save by pressing or cancel by pressing .

 Press repeatedly to exit menu.

KFB/KFN-TM-BA_IA-e-1323 39

Menu block
Main menu

Menu item
Submenu

Acoustic signal for weighing with tolerance range
switched off

P1 REF

P2 COM

MODE

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.

added to the summation memory and issued.

8.1 Overview non verifiable weighing systems
(contacts of circuit board [K1] not short-circuited)

Available settings / explanation

PO CHK

Weighing with
tolerance range,
see chap. 7.7

Zero point
settings

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

ok Audio sound when load is within tolerance limits
nG Audio sound when load is beyond tolerance limits

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 Automatic taring „on / off“, taring range adjustable in menu

item „0Auto“.
SPEEd Not documented
Zero Zero point setting

CONT

Interface
parameter

Press and the weighing value will be

40 KFB/KFN-TM-BA_IA-e-1323

AUTO*

For automatic add-up see chap. 7.9.

memory on unloading of weighing scale.

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 setti n g

LP50

Not documented

Lab

Lab x

Prt

Prt x

LAnG

eng*

Standard settings English

chn

P3 CAL

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

on

Keyboard lock enabled, see chap. 7.11

off*

Keyboard lock disable d

on

Animal weighing enabled, see chap. 7.10

off*

Animal weighing disabled

This function is used to issue and add individual
weighing values automatically to the summation

Configuration
data
see chap. 12.4

ASK

For remote control commands, see chap. 10.4

For data output format, see chap.8.2, tab. 1

P4 OTH

LOCK
ANM

KFB/KFN-TM-BA_IA-e-1323 41

kg
on* off

g on off*

lb
on off*

oz
on off*

tJ
on off

HJ
on off

P5 Unt

Switch-over
weighing unit,
see chap. 7.5

P6 xcl Not documented
P7 rst

Use to reset balance settings to factory default.

P8 uwb Not documented

Factory settings are marked by *.

42 KFB/KFN-TM-BA_IA-e-1323

Menu block
Main menu

Menu item
Submenu

Acoustic signal for weighing with tolerance
range switched off

Audio sound when load is within tolerance
limits

Audio sound when load is beyond tolerance
limits

P1 COM

MODE

CONT
S0 off

Continuous data output,
selectable “send zero” yes / no

S0 on

ST1

One output for stable weighing value

Continuous data output of stable weighing
values

PR1

Output after pressing

PR2

Manual totalizing, see chap. 7.8

added to the summation memory and issued.

AUTO

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 shor t -circuited by 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.

PO CHK

Weighing with
tolerance range,
see chap. 7.7

Interface
parameter

Available settings / explanation

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
ok
ng

STC

KFB/KFN-TM-BA_IA-e-1323 43

Press and the weighing value will be

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.

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

Prt

Prt x

Lang
Eng*

Chn

P2 mode

SiGr

Single-range balance

COUNT

Display internal resolution

DECI

Position of the decimal dot

Div.

Readability [d] / verification value[s]

CAP

Balance capacity [Max]

noLin

Adjustment, see chap. 6.9

LinEr

Linearisation, see chap. 6.10

GrA

Not documented

dUAL 1

Dual range balance

scales will remain in 2nd range.

COUNT

Display internal resolution

DECI

Position of the decimal dot

Readability [d] / verification value [e]

1. weighing range

Readability [d] / verification value [e]

2. weighing range

Weighing scale capacity [max]

1. Weighing range

Weighing scale capacity [max]

2. Weighing range

noLin

Adjustment, see chap. 6.9

LinEr

For linearization, see chap. 6.10

GrA

Not documented

Konfigurations­daten

Details see following table 1

Standard setting English

CAL

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

div 1

div.

div 2
CAP 1

CAP

CAP 2

CAL

44 KFB/KFN-TM-BA_IA-e-1323

dUAL 2

Multi-interval balance

changed during loading and unloading.

COUNT

Display internal resolution

DECI

Position of the decimal dot

Readability [d] / verification value [e]

1. weighing range

Readability [d] / verification value [e]

2. weighing range

Weighing scale capacity [max]

1. Weighing range

Weighing scale capacity [max]

2. Weighing range

noLin

Adjustment, see chap. 0

LinEr

Linearisation, see chap. 6.10

GrA

Not documented

P3 OTH

on

Keyboard lock enabled

off

Keyboard lock disabled

on

Animal weighing enabled

off

Animal weighing disabled

P4 tAr

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

Lab

**********************

**********************

**********************

**********************

GS / GW

Gross weight

NO

Number weighing processes

NT

Net weight

TOTAL

Total of all individual weighings

TW

Tare weight

Weighing scales with one weighing range subdivided into partial
weighing ranges, each providing a different scale interval. The
scale interval depends on the applied load and is automatically

div 1

div.

div 2
CAP 1

CAP

CAP 2

CAL

s. Kap. 7.10 / 7.11

ANM

LOCK

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.

Tab. 1. Printout examples Standard printer

Prt

0~3

*******************
GS: 5.000kg
*******************

0 1 2 3

*******************
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
*******************

KFB/KFN-TM-BA_IA-e-1323 45

*******************
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

Value outside the A/D changer

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

- - ol - -

Err 1
Err 2
Err 4 Zeroing range exceeded due

Err 5 Keyboard error
Err 6

Incorrect data input
Incorrect time entry

to switching-on balance or
pressing (normally 4%

max)

range

• Unload weighing system or reduce
preload.

• Follow format “yy:mm:dd“

• Follow format “hh:mm:ss“

• Object on the weighing plate

• Overload when zeroing

• Weighing plate not installed

• Damaged weighing cell

Err 9 Stability display does not

appear

46 KFB/KFN-TM-BA_IA-e-1323

• Damaged electronics

• Check the environmental

conditions.

Err 10 Communication error
Err 15 Gravitation error
Err 17 Taring range exceeded
Fai l h /

Fai l l
Err P
Ba lo /

Lo ba

Should other error messages occur, switch balance off and then on again. If the error
message remains inform manufacturer.

Adjustment error

Printer error

Battery very low

• No data

• Range 0.9 ~ 1.0

• Reduce load

• Repeat adjustment.

• Check communication paramet er s

• Recharge battery

KFB/KFN-TM-BA_IA-e-1323 47

ST, GS 1.000kg

10 Da t a 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.

• Communication 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 Technic al da ta

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

48 KFB/KFN-TM-BA_IA-e-1323

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

ST,GS 1.000KG

****************************

Symbols:

• Counting

PCS 100
****************************

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

W Weighing value for the weight (stabl e or

ST,GS 1.000KG

US,GS 1.342KG

unstable) is sent via the RS232 interface

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

KFB/KFN-TM-BA_IA-e-1323 49

-

-

10PCS

The displayed weight does
not glow.

• 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

• Table/floor vibrations

• Weighing pan has contact with other objects.

possible)

The weighing result is
obviously incorrect

• Adjustment is no longer correct.

• Great fluctuations in temperature.

possible)

11 Instant help

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 display unit is not switched on.

permanently changing

Should other error messages occur, switch display unit off and then on again. If the
error message remains inform manufacturer.

• Draught/air movement

• Electromagnetic fields / static charging (choose

different location/switch off interfering device if

• The display of the balance is not at zero

• Warm-up time was ignored.

• Electromagnetic fields / static charging (choose

different location/switch off interfering device if

50 KFB/KFN-TM-BA_IA-e-1323

12 Installing displa y unit / weighi ng bridge

• Installation / configuration of a weighing system must be carried out

12.1 Technic al da ta

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

by a well acquainted specialist with the workings of weighing
balances.

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 zer o
setting range equals therefore 4 % of the scale’s capacity.

The addition of weighing scales capacity, preload and the tot al z er o sett ing
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 cha p. 6.11.
Remove the jumper for weighing systems not able to be verified.

KFB/KFN-TM-BA_IA-e-1323 51

PIN

Loadcell

6- conductor

4- conductor

7

EXC+

6

SEN+

5

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

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.

EXC+

52 KFB/KFN-TM-BA_IA-e-1323

EXC-

12.4 Configure displ ay 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-veri fied 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-1323 53

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.

54 KFB/KFN-TM-BA_IA-e-1323

6.10.1 for linearisation

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.

KFB/KFN-TM-BA_IA-e-1323 55

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.

56 KFB/KFN-TM-BA_IA-e-1323

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 i th and acknowledge by .

 Press , the unit will return to the menu

 Press to select the next menu item.

KFB/KFN-TM-BA_IA-e-1323 57

6.10.1 for linearisation

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.

 Acknowledge using , the current setting is displayed.
 Acknowledge by , select desired setting with

= Adjustment

= Linearisation



58 KFB/KFN-TM-BA_IA-e-1323

 Press repeatedly to exit menu.

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 .

KFB/KFN-TM-BA_IA-e-1323 59

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.

60 KFB/KFN-TM-BA_IA-e-1323

the current setting will be shown (such as max. =

 Select desired setting with and acknowledge by .

 Press , the display for entering capacity will appear (at

dual range balance for the first ra nge).

 Press ,

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-1323 61

6.10.2 for linearisation



 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 i th 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.

 Acknowledge using , the current setting is displayed.
 Press to confirm, press to select the desired

setting
noLin = Adjustment
LineAr = Linearisation

62 KFB/KFN-TM-BA_IA-e-1323

KERN & Sohn GmbH

D-72322 Balingen-

sohn.de

Phone: 0049-[0]7433- 9933-

D

Konformitäts­erklärung

Wir erklären hierm it, dass das Produkt, auf das sich diese Erk lärung bezieht,
mit den nachstehenden Normen übereinstimmt.

EN

Declaration of
conformity

We hereby declare that the product to which this dec laration refers conforms
to the following standards.

CZ

Prohlášení o
shode

Tímto prohlašujem e, že v ýrobek , k terého se toto proh lášení týká , je v souladu
s níže uvedenými normami.

E

Declaración de
conformidad

Manifestamos en la presente que el producto al que se refiere esta
declaración está de acuerdo con las normas siguientes

F

Déclaration de
conformité

Nous déclarons avec cela res ponsabilité que le produit, auquel se r apporte la
présente déclaration, est conforme aux normes citées ci-après.

I

Dichiarazione di
conformità

Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si
riferisce è conforme alle norme di seguito citate.

NL

Conformiteit­verklaring

Wij verklaren hiermede dat het product, waarop deze verklaring betrekking
heeft, met de hierna vermelde normen overeenstemt.

P

Declaração de
conformidade

Declaramos por meio da presente que o produto no qual se refere esta
declaração, corresponde às normas seguintes.

PL

Deklaracja
zgodności

Niniejszym oświadczamy, że produkt, którego niniejsze oświadczenie dotyczy,
jest zgodny z poniższymi normami.

RUS

Заявление о

соответствии

Мы заявляем, что продукт, к которому относится данная декларация,

соответствует перечисленным ниже нормам.

EU Directive

Standards

2004/108/EC

EN55022: 2006 A1:2007
EN55024: 1998+A1:2001+A2:2003

2006/95/EC

EN 60950-1:2006
EN 60065:2002+A1:2006

Signature

Datum

08.04.2013

Ort der Ausstellung

Place of issue

72336 Balingen

Albert Sauter
KERN & Sohn GmbH

Geschäftsführer

Managing director

KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0
Fax +49-[0]7433/9933-149, E-Mail: [e-mail], Internet: www.kern-sohn.com

13 De c laration of Conformity / Tes t Ce rt ificate

Frommern
Postbox 4052
E-Mail: info@kern-

0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.de

Declaration of conformity

EC Declaration of Conformity EC-Declaration of -Conformity
EC- Déclaration de conformité EC-Declaración de Conformidad
EC-Dichiarazione di conformità EC-Conformiteitverklaring
EC- Declaração de conformidade EC- Prohlášení o shode
EC-Deklaracja zgodności EC-Заявление о соответствии

Electronic Balances:
KERN KFB-TM, KFN-TM, BFB, BFN, IFB, NFB, SFB, UFA, UFB, UFN

EN61000-3-3:1995+A1:2001+A2:2005

Date

KFB/KFN-TM-BA_IA-e-1323 63

Signatur

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

In accordance with Paragraph 8.1 of the European Standard on metrological aspects

Fractional factor (pi) 0.5 (refer to 3.5.4 of the standard).

Issued to Kern & Sohn GmbH

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

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-

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

EU - Notified Body No. 0199

of non-automatic weighing instruments EN 45501:1992.

Ziegelei 1
D 72336 Balingen-Frommern
GERMANY

characteristics:

Self indicating with single-interval, multi-interval or

multi-range
Accuracy class III or IIII
Verification scale interval: e

= Maxi/ni

i

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.

1910568, DANAK-1910388 and NMi 709226.

DELTA

Danish Electronics,

Light & Acoustics

Venlighedsvej 4

2970 Hørsholm

Denmark

Tel. [phone]

Fax [phone]

www.delta.dk

VAT No. DK 12275110

Annex page 1 of 7
Annex to Test Certificate No. DK0199-R76-11.04

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

Issued by DELTA

Annex page 2 of 7
Annex to Test Certificate No. DK0199-R76-11.04

•

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

Verification scale interval, e

= Maxi / ni

i

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

Operating temperature range Min / Max = -10 °C / +40 °C

Peripheral interface(s) See Section 4

): ni × ei

i

230 VAC using external Vac/2Vdc adapter

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

2

Maximum length 227 m/mm
Maximum resistance per wire 3.8 ohm

Issued by DELTA

Annex page 3 of 7
Annex to Test Certificate No. DK0199-R76-11.04

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.

Issued by DELTA

Annex page 4 of 7
Annex to Test Certificate No. DK0199-R76-11.04

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.

Issued by DELTA

Annex page 5 of 7
Annex to Test Certificate No. DK0199-R76-11.04

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.

Issued by DELTA

Annex page 6 of 7
Annex to Test Certificate No. DK0199-R76-11.04

9. Pictures

Figure 1 Sealing of KFN-TM.

a self destroyable sticker/seal shall be used.

After remove the label, you will find VOID on housing, or

Issued by DELTA

Annex page 7 of 7
Annex to Test Certificate No. DK0199-R76-11.04

Issued by DELTA

Figure 2 Sealing of KFB-TM.