KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-mail:
info@kern-sohn.com
Operating Manual
Tel.: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet:
www.kern-sohn.com
Precision balance
KERN PFB
Version 1.2
08/2009
GB
PFB-BA-e-0912
GB
KERN PFB
Version 1.2 08/2009
Operating Manual
Precision balance
Table of Contents
1 Technical Data ................................................................................................... 4
2 Declaration of conformity ................................................................................. 6
3 Basic Information (General) ............................................................................. 7
3.1 Proper use................................................................................................................................. 7
3.2 Improper Use ............................................................................................................................ 7
3.3 Warranty .................................................................................................................................... 7
3.4 Monitoring of Test Resources................................................................................................. 8
4 Basic Safety Precautions.................................................................................. 8
4.1 Pay attention to the instructions in the Operation Manual .................................................. 8
4.2 Personnel training .................................................................................................................... 8
5 Transportation & Storage ................................................................................. 8
5.1 Testing upon acceptance ........................................................................................................ 8
5.2 Packaging.................................................................................................................................. 8
6 Unpacking, Setup and Commissioning ........................................................... 8
6.1 Installation Site, Location of Use............................................................................................ 8
6.2 Unpacking ................................................................................................................................. 9
6.2.1 Placing/ Remove the transportation lock.................................................................................... 9
6.2.2 Scope of delivery ...................................................................................................................... 10
6.3 Mains connection ................................................................................................................... 10
6.4 Connection of peripheral devices......................................................................................... 10
6.5 Initial Commissioning ............................................................................................................ 10
6.6 Adjustment.............................................................................................................................. 10
6.7 Adjusting ................................................................................................................................. 10
7 Controls............................................................................................................ 12
7.1 Keyboard overview................................................................................................................. 12
7.2 Overview of display................................................................................................................ 13
8 Operation ......................................................................................................... 14
8.1 Simple weighing ..................................................................................................................... 14
8.2 Taring....................................................................................................................................... 15
8.3 Parts counting ........................................................................................................................ 16
8.4 Adding ..................................................................................................................................... 17
8.5 Percent weighing.................................................................................................................... 18
2 PFB-BA-e-0912
9 The menu ......................................................................................................... 19
9.1 Menu map................................................................................................................................ 19
9.2 Call up menu ........................................................................................................................... 19
9.3 Navigation in the menu..........................................................................................................19
9.4 Menu overview........................................................................................................................ 19
9.5 Menu settings ......................................................................................................................... 20
9.5.1 Switch over weighing units (Unit) ............................................................................................. 20
9.5.2 Display background illumination............................................................................................... 21
10 Error messages............................................................................................ 22
11 Service, maintenance, disposal.................................................................. 22
11.1 Cleaning .................................................................................................................................. 22
11.2 Service, maintenance............................................................................................................. 22
11.3 Disposal................................................................................................................................... 22
12 Instant help................................................................................................... 23
PFB-BA-e-0912 3
1 Technical Data
KERN PFB 120-3 PFB 200-3 PFB 1200-2
Readability (d) 0,001 g 0,001 g 0,01 g
Weighing range (max) 120 g 200 g 1200 g
Reproducibility 0,001 g 0,001 g 0,01 g
Linearity ±0,003 g ±0,003 g ±0,03 g
Smallest part weight for
piece counting
Reference quantities at
piece counting
Weighing Units g, ct, lb, oz, d, ozt, dwt, mo, tl h, tl c, tl t, t, bt, n
Recommended adjustment
weight, not added (class)
Warm-up time 2 hours 2 hours 2 hours
Stabilization time (typical) 3 sec.
Operating temperature + 5° C .... + 35° C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm
2 mg 2 mg 20 mg
10, 20, 50, 100, 200
100 g (F1) 200 g (F1) 1000 g (F1)
200 x 257 x 152 (with draft shield)
200 x 257 x 87(without draft shield)
Draft shield (B x D x H) mm,
plastic
Weighing plate, stainless steel
(mm)
Weight kg (net) 2 kg 2 kg 2 kg
Underfloor weighing optional
Voltage 220-240 V / 50 Hz
Rechargeable battery,
assembled
Ø 80 Ø 80 Ø 120
Service life c. 48 hours / loading time ca. 12 hrs.
Operating time ca. 24h. / loading time ca. 12 hrs.
158 x 143 x 64 (inside)
167 x 154 x 80 (outside)-
Without backlit display:
With backlit display:
4 PFB-BA-e-0912
KERN PFB 2000-2 PFB 6000-1 PFB 6K0.05
Readability (d) 0,01 g 0,1 g 0,05 g
Weighing range (max) 2000 g 6000 g 6000 g
Reproducibility 0,01 g 0,1 g 0,05 g
Linearity ±0,03 g ± 0,3 g ± 0,15 g
Smallest part weight for
piece counting
Reference quantities at
piece counting
20 mg 200 mg 200 mg
10, 20, 50, 100, 200
Weighing Units g, ct, lb, oz, d, ozt, dwt, mo, tl h, tl c, tl t, t, bt, n
Recommended adjustment
weight, not added (class)
2000 g (F1) 5000 g (F1) 5000 g (F1)
Warm-up time 2 hours 2 hours 2 hours
Stabilization time (typical) 3 sec.
Operating temperature + 5° C .... + 35° C
Humidity of air max. 80 % (not condensing)
200 x 257 x 152
(with draft shield)
Housing (B x D x H) mm
200 x 257 x 87
(without draft
shield)
-
Draft shield (B x D x H) mm,
plastic
158 x 143 x 64
(inside)
167 x 154 x 80
-
(outside)
Weighing plate, stainless steel
(mm)
Ø 120 155 x 145 155 x 145
Weight kg (net) 2 kg 2 kg 2 kg
Underfloor weighing optional
Voltage 220-240 V / 50 Hz
Without backlit display:
Rechargeable battery,
assembled
Service life c. 48 hours / loading time ca. 12 hrs.
With backlit display:
Operating time ca. 24h. / loading time ca. 12 hrs.
PFB-BA-e-0912 5
2 Declaration of conformity
KERN & Sohn GmbH
D-72322 Balingen-Frommern
Postbox 4052
email: info@kern-sohn.de
Phone: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.de
Declaration of conformity
EC-Konformitätserklärung 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
D
GB
CZ
E
F
I
NL
P
PL
RUS
Konformitätserklärung
Declaration of
conformity
Prohlášení o
shode
Declaración de
conformidad
Déclaration de
conformité
Dichiarazione di
conformitá
Conformiteitverklaring
Declaração de
conformidade
Deklaracja
zgodności
Заявление о
соответствии
Wir erklären hiermit, dass das Produkt, auf das sich diese Erklärung bezieht,
mit den nachstehenden Normen übereinstimmt.
We hereby declare that the product to which this declaration refers conforms
to the following standards.
Tímto prohlašujeme, že výrobek, kterého se toto prohlášení týká, je v souladu
s níže uvedenými normami.
Manifestamos en la presente que el producto al que se refiere esta
declaración está de acuerdo con las normas siguientes
Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la
présente déclaration, est conforme aux normes citées ci-après.
Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si
riferisce è conforme alle norme di seguito citate.
Wij verklaren hiermede dat het product, waarop deze verklaring betrekking
heeft, met de hierna vermelde normen overeenstemt.
Declaramos por meio da presente que o produto no qual se refere esta
declaração, corresponde às normas seguintes.
Niniejszym oświadczamy, że produkt, którego niniejsze oświadczenie dotyczy,
jest zgodny z poniższymi normami.
Мы заявляем, что продукт, к которому относится данная декларация,
соответствует перечисленным ниже нормам.
Electronic Balance: KERN PFB
Mark applied EU Directive Standards
2004/108/EC
EMC
Date: 18.09.2008 Signature:
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0,Fax +49-[0]7433/9933-149
6 PFB-BA-e-0912
EN 61000-6-1 :2007
EN 61000-6-3 :2007
EN 61000-3-3 : 1995+A1 :2001+A2 :2005
EN 61000-3-2 :2006
Gottl. KERN & Sohn GmbH
Management
3 Basic Information (General)
3.1 Proper use
The balance you purchased is intended to determine the weighing value of material
to be weighed. It is intended to be used as a “non-automatic“ balance, i.e. the
material to be weighed is manually and carefully placed in the centre of the weighing
plate. As soon as a stable weighing value is reached the weighing value can be read.
3.2 Improper Use
Do not use balance for dynamic weighing. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results can be
displayed due to the “stability compensation“ in the balance. (Example: Slowly
draining fluids from a container on the balance.)
Do not leave permanent load on the weighing plate. This may damage the measuring
system.
Impacts and overloading exceeding the stated maximum load (max) of the balance,
minus a possibly existing tare load, must be strictly avoided. Balance may be
damage by this.
Never operate balance in explosive environment. The serial version is not explosion
protected.
The structure of the balance may not be modified. This may lead to incorrect
weighing results, safety-related faults and destruction of the balance.
The balance may only be used according to the described conditions. Other areas of
use must be released by KERN in writing.
3.3 Warranty
Warranty claims shall be voided in case
• Our conditions in the operation manual are ignored
• The appliance is used outside the described uses
• The appliance is modified or opened
• Mechanical damage and damage caused by media, liquids
Natural wear and tear
• The appliance is improperly set up or incorrectly electrically connected
• The measuring system is overloaded
PFB-BA-e-0912 7
3.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
balance and, if applicable, the testing weight, must be checked regularly. The
responsible user must define a suitable interval as well as type and scope of this test.
Information is available on KERN’s home page (www.kern-sohn.com with regard to
the monitoring of balance test substances and the test weights required for this. In
KERN’s accredited DKD calibration laboratory test weights and balances may be
calibrated (return to the national standard) fast and at moderate cost.
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 Transportation & 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
Keep all parts of the original packaging in case you need to return the appliance.
Only use original packaging for returning.
Before sending, disconnect all connected cables and loose/movable parts.
Attach possibly existing transport safeguards. Secure all parts, e.g. weighing plate,
power unit etc., to prevent slipping and damage.
6 Unpacking, Setup and Commissioning
6.1 Installation Site, Location of Use
The balances are designed in a way that reliable weighing results are achieved in
common conditions of use.
You will work accurately and fast, if you select the right location for your balance.
8 PFB-BA-e-0912
Therefore, observe the following for the installation site:
• Place the balance on a firm, level surface;
• Avoid extreme heat as well as temperature fluctuation caused by installing
next to a radiator or in the direct sunlight;
• Protect the balance against direct draughts due to open windows and doors;
• Avoid jarring during weighing;
• Protect the balance against high humidity, vapors and dust;
• Do not expose the device to extreme dampness for longer periods of time.
Non-permitted condensation (condensation of air humidity on the appliance)
may occur if a cold appliance is taken to a considerably warmer environment.
In this case, acclimatize the disconnected appliance for ca. 2 hours at room
temperature.
• Avoid static charge of goods to be weighed or weighing container.
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
Carefully remove the balance from the packaging and setup balance at the intended
workstation.
6.2.1 Placing/ Remove the transportation lock
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.
Remove the transportation lock [ 1 ] (PFB 120-3, PFB 1200-2):
[1]
PFB-BA-e-0912 9
6.2.2 Scope of delivery Serial accessories:
• Balance
• Weighing plate
• Mains power supply
• Operating Manual
• Draft shield (only models PFB 120-3, PFB 1200-2)
6.3 Mains connection
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage.
Only use original KERN mains adapters. Using other makes requires consent by
KERN.
6.4 Connection of peripheral devices
Before connecting or disconnecting of additional devices (printer, PC) to the data
interface, always disconnect the balance from the power supply.
With your balance, only use accessories and peripheral devices by KERN, as they
are ideally tuned to your balance.
6.5 Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have
reached the operating temperature (see warming up time chap. 1). During this
warming up time the balance must be connected to the power supply (mains,
accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
6.6 Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each balance must be coordinated - in compliance with the underlying physical
weighing principle - to the existing acceleration due to gravity at its place of location
(only if the balance has not already been adjusted to the location in the factory). This
adjustment process must be carried out for the first commissioning, after each
change of location as well as in case of fluctuating environment temperature. To
receive accurate measuring values it is also recommended to adjust the balance
periodically in weighing operation.
6.7 Adjusting
The adjustment should be made with the recommended adjustment weight (see
chap. 1 "Technical data").
10 PFB-BA-e-0912
Procedure when adjusting:
Observe stable environmental conditions.
A warming up time (see chapter 1; Technical Data) is required for stabilization.
Ensure that there are no objects on the weighing plate.
Balance display Operation
Ö In weighing mode press approx. 3 sec. until
When display „LoAd“ appears, put the necessary
adjustment weight (see chap.1; Technical Data) on the
center of the weighing plate.
Adjustment will be carried out automatically after dead
stop control.
„UnLoAd“ appears.
Ö Wait for stability display
„Pass“ appears, the adjustment process has been
finished successfully.
Ö Take away adjustment weight
Wait until the balance is again in the weighing mode.
PFB-BA-e-0912 11
7 Controls
7.1 Keyboard overview Buttons specification:
Key Designation Pressed once and released
ON
OFF
[ON/OFF]
Ö Turn on/off
[ZERO]
Ö Set weight display at zero
Ö Activate the current element in the menu
Ö Select in Weighing units (menu F UNIT):
change to the next unit
[TARE]
Ö Taring
[%]
Ö Call-up %-function
Ö In the percent mode back to weighing mode
Ö Only % function
[PCS]
[MODE]
Ö Call-up piece counting mode
Ö In the piece count mode back to weighing mode
Ö Weighing units switch-over;
Ö At weighing unit switch-over (menu „F UNIT“):
Set weighing unit on/off
Ö Counting up in piece counting mode
Ö Select menu and pass through menu items
from top to bottom
Ö Changing readability
[PRINT/ESC]
Ö Print out weighing result
Ö Exit menu (jumping back to weighing mode)
12 PFB-BA-e-0912
7.2 Overview of display
Display Description
g
kg
→0←
→T←
ο
Pcs
%
(mom)
CAL
Weight unit
display
Gram
Kilogram
Zeroing display
Taring
Stability display
Display for piece counting
Percent weighing display
Display for tolerance weighing
Momme
Display for adjustment. Signals the adjustment function
Bar graph
g (Gramm)
(ct) Carat
(oz) Ounce
(ozt) Fine ounce
(d) Dram
(dwt) Penny weight
(tl.h) Tael (Taiwan)
(tl.c) Tael (Chin.)
(t.lt) Troy Tael
(t) Tola
Display for rechargeable battery operation (optional).
The display changes to mains cable operation if the voltage falls
below the prescribed minimum.
PFB-BA-e-0912 13
8 Operation
8.1 Simple weighing Balance display Operation
Ö Start balance by pressing
The balance will carry out a self-test.
Wait for „0.0“ display
Ö Should the balance not display exactly „0.0“
ON
OFF
despite empty scale pan, press the button.
The balance starts with resetting to „0“
Ö Place goods to be weighed on balance
Wait until the stability display appears [ ] .
Read weighing result.
Ö To switch off the balance press shortly
ON
OFF
.
14 PFB-BA-e-0912
8.2 Taring
T
O
T
O
The dead weight of any weighing container may be tared away by pressing a button,
so that the following weighings show the net weight of the goods to be weighed.
Balance display Operation
Ö Deposit weighing receptacles.
The weight of the container is displayed.
Ö Press , the zero display appears.
The pictogram
The pictogram
The weight of the container is now internally saved.
Ö Place goods to be weighed in the weighing
container.
The net weight of the goods to be weighed is
displayed.
is displayed.
goes out.
Ö The weight of the weighing container will be
displayed as a minus number after removing the
weighing container.
Ö The tare weight is saved until it is deleted. Remove
the load from the balance and press . The zero
display appears, the pictogram
will be displayed again.
goes out and
PFB-BA-e-0912 15
8.3 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.
The higher the reference quantity the higher the counting
exactness.
Balance display Operation
Ö Start balance by pressing
The balance will carry out a self-test.
Wait for „0.0“ display.
Ö Press
Appears the reference quantity „10“.
By pressing the key several times, the
reference quantities 10, 20, 50, 100, 200 can be set
Ö Place as many parts to count on the weighing plate
as the set reference quantity requires.
ON
OFF
Ö Confirm by pressing
The balance is now in parts counting mode and counts
all units on the weighing plate.
Ö Press
The balance is in weighing mode and displays the
weight of the counted parts.
Ö Remove the load
Ö Back to weighing mode by pressing again the
button.
16 PFB-BA-e-0912
8.4 Adding
It is useful, when a mixture of various components is weighed in a tare container and
finally for control purposes the sum weight of all weighed components is required.
Example:
Balance display Operation
ON
Ö Start balance by pressing
OFF
The balance will carry out a self-test.
Wait for „0.0“ display.
Ö Put on the first test item
The weight of the first test item is displayed
Ö Press
(Example)
„ACC 1“ is shortly displayed, then appears once more
the weight of the first test item.
Ö Remove the first test item
Ö Put on the second test item
(Example)
The weight of the second test item is displayed.
Ö Press
„ACC 2“ is shortly displayed
Then appears for 2 seconds the weight of both test
items, before the weight of the second test item will
appear again.
In order to delete the stored values, press and as long as the sum
of the test items is displayed, press , the balance will return to
„0.0g“.
PFB-BA-e-0912 17
8.5 Percent weighing
Percent weighing allows to display weight in percent, in relation to a reference
weight.
Balance display Operation
ON
Ö Start balance by pressing
OFF
The balance will carry out a self-test.
Wait for the „0.0g“ display.
Ö Put a reference weight on the weighing plate, which
corresponds to 100%
Ö Press
In the display appears „100.00%“
Ö Remove reference weight
The display returns to „0.0g“
Ö Put on specimen
In the display appears the percentage of the specimen
with reference to the reference weight.
Ö Back to weighing mode by pressing again the
button.
18 PFB-BA-e-0912
9 The menu
9.1 Menu map
In the menu can be made 8 different settings and the adjustment.
9.2 Call up menu
The menu is called-up by pressing the key, while the balance is carrying out the
self test. In the display appears the message „F1 UNT“
9.3 Navigation in the menu
Key Direction in the
menu
9.4 Menu overview Balance display Operation
Selection of weighing units
1
F
UnT
Select menu and pass through menu items from
top to bottom
Select current element
Exit the current element, return to weighing mode
Description
Background lighting on/automatic/off
2
F
3
F
PFB-BA-e-0912 19
BL
Q
C
n
• EL on: Background lighting on
• EL Au: Background lighting switches on
automatically
EL off: Background lighting off
RS-232-interface
• P prt: connect with printer
• Pcont: for remote control orders
• P auto: autom. printout
9.5 Menu settings
9.5.1 Switch over weighing units (Unit)
The weighing units are switched on or off via the menu.
Activate function:
Balance display Operation
Ö Start balance by pressing
As long as the balance carries out a self test, press
.
„F1 Unt“ is displayed.
ON
OFF
1
F
Switch-over weighing unit:
By pressing the key in the weighing mode it is possible to switch over between
the activated units.
UnT
(Example)
Ö Press
Weighing unit is switched on or off.
Ö Use to switch weighing unit on or off
Ö Using change to the next unit.
20 PFB-BA-e-0912
9.5.2 Display background illumination
In the menu the display background illumination can be switched on or off.
To achieve this, follow the sequence of operations below:
Balance display Operation
ON
Ö Start balance by pressing
As long as the balance carries out a self test, press
.
„F1 Unt“ is displayed.
OFF
1
F
F
Display
„EL on“
„EL off“
UnT
2
(Example)
BL
Adjustment Function
Background illumination on Contrastful display which can also be red
Background illumination off Battery saving
Ö Press
„F2 bL“ is displayed.
Ö Press
„EL on“ or „EL off“ resp. „EL AU“ is displayed
Ö Press to switch over between the three settings
Ö Press to activate the displayed setting.
in the darkness.
„EL AU“
PFB-BA-e-0912 21
The background illumination
will be switched off
automatically 10 sec after
having reached a stable
weighing value.
Battery saving
10 Error messages
Err 3
Incorrect adjusting weight
Put on correct adjustment
weight (see chap. 1; Technical
Data
Err 4
Err 5
Err 6
Zero range exceeded
Keyboard error Inadmissible input
Electronic error
Remove load and press to
reset balance to zero.
Switch balance off and on
again. If the error message
remains displayed, please
contact your dealer.
11 Service, maintenance, disposal
11.1 Cleaning
Before cleaning, please disconnect the appliance from the operating voltage.
Please do not use aggressive cleaning agents (solvents or similar agents), but a cloth
dampened with mild soap suds. Ensure that no liquid penetrates into the device and
wipe with a dry soft cloth.
Loose residue sample/powder can be removed carefully with a brush or manual
vacuum cleaner.
Spilled weighing goods must be removed immediately.
11.2 Service, maintenance
The appliance may only be opened by trained service technicians who are authorized
by KERN.
Before opening, disconnect from power supply.
11.3 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.
22 PFB-BA-e-0912
12 Instant help
In case of an error in the program process, briefly turn off the balance 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 displayed weight is
permanently changing
• The balance is not switched on.
• The mains supply connection has been interrupted
(mains cable not plugged in/faulty).
• Power supply interrupted.
• (Rechargeable) batteries are inserted incorrectly or
empty
• No (rechargeable) batteries inserted.
• Draught/air movement
• Table/floor vibrations
• Weighing plate has contact with other objects.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
The weighing result is
obviously incorrect
Should other error messages occur, switch balance off and then on again. If the error
message remains inform manufacturer.
• 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)
PFB-BA-e-0912 23
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