KERN PFB 120-3A User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Precision balances
KERN PFB
Type PFB_A
Version 4.1
2017-10
GB
PFB-BA-e-1741

2 PFB-BA-e-1741
GB
KERN PFB
Type PFB_A Version 4.12017-10
Operating manual
Precision balance
Contents
1Technical data................................................................................................ 4
2Declaration of conformity ............................................................................. 7
3Appliance overview ....................................................................................... 8
3.1 Keyboard overview..................................................................................................................... 8
3.2 Overview of display .................................................................................................................... 9
4Basic Information (General)........................................................................ 10
4.1 Proper use................................................................................................................................ 10
4.2 Improper Use............................................................................................................................ 10
4.3 Warranty................................................................................................................................... 10
4.4 Monitoring of Test Resources................................................................................................... 11
5Basic Safety Precautions............................................................................ 11
5.1 Pay attention to the instructions in the Operation Manual........................................................ 11
5.2 Personnel training..................................................................................................................... 11
6Transport and storage................................................................................. 11
6.1 Testing upon acceptance ......................................................................................................... 11
6.2 Packaging / return transport..................................................................................................... 11
7Unpacking, Setup and Commissioning ..................................................... 12
7.1 Installation Site, Location of Use.............................................................................................. 12
7.2 Unpacking and checking .......................................................................................................... 12
7.2.1 Placing...................................................................................................................................... 13
7.3 Mains connection...................................................................................................................... 14
7.4 Connecting to power supply..................................................................................................... 14
7.5 Connection of peripheral devices............................................................................................. 14
7.6 Adjustment................................................................................................................................ 15
7.7 Linearization ............................................................................................................................. 16
8Basic Operation ........................................................................................... 19
8.1 Start-up..................................................................................................................................... 19
8.2 Switching Off ............................................................................................................................ 19
8.3 Zeroing...................................................................................................................................... 19
8.5 Switch-over weighing unit......................................................................................................... 20
9Applications ................................................................................................. 22
9.1 Percent determination .............................................................................................................. 22
9.2 Parts counting........................................................................................................................... 23
9.3 Totalization ............................................................................................................................... 24
9.3.1 Manual totalizing....................................................................................................................... 24
9.3.2 Automatic adding-up................................................................................................................. 27

PFB-BA-e-1741 3
10 Menu ............................................................................................................. 29
10.1 Navigation in the menu............................................................................................................. 29
10.2 Access to technology menu...................................................................................................... 30
10.3 Overview................................................................................................................................... 31
11 Interfaces...................................................................................................... 33
11.1 RS232....................................................................................................................................... 33
11.1.1 Technical data...................................................................................................................... 33
11.1.2 Printer operation (RS 232) ................................................................................................... 34
11.1.3 Output log (continuous output)............................................................................................. 35
11.2 Remote control instructions...................................................................................................... 35
11.3 Bluetooth (Factory option)........................................................................................................ 36
11.3.1 Add device............................................................................................................................ 36
11.3.2 Determine COM Port number .............................................................................................. 38
12 Servicing, maintenance, disposal .............................................................. 39
12.1 Cleaning.................................................................................................................................... 39
12.2 Servicing, maintenance............................................................................................................ 39
12.3 Disposal.................................................................................................................................... 39
13 Error messages............................................................................................ 39
14 Instant help................................................................................................... 40

4 PFB-BA-e-1741
1 Technical data
KERN (Type) PFB 120-3A PFB 200-3A PFB 300-3A
Trademark PFB 120-3 PFB 200-3 PFB 300-3
Readability (d) 0,001 g 0,001 g 0,001 g
Weighing range (max) 120 g 200 g 300 g
Reproducibility 0,001 g 0,002 g 0,002g
Linearity ±0,003 g ±0,005 g ±0,005 g
Smallest part weight for
piece counting 2 mg 2 mg 2 mg
Reference quantities at
piece counting 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) 100 g (F1) 200 g (F1) 300 g (F1)
Warm-up time 2 hours
Stabilization time (typical) 3 sec.
Operating temperature + 15° C .... + 35° C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 315 x 210 x 156
Dimensions of wind screen
(B x D x H) mm 124 x 119 x 80
Weighing plate,
stainless steel (mm) Ø 80 Ø 80 Ø 80
Weight kg (net) 2 kg
Electric Supply
Input voltage weighing scales 12 V / 500 mA
Input voltage power supply unit 100 V – 240 V, 50/60 Hz
Interfaces RS232
Bluetooth 2.0 (factory option)
Bluetooth 4.0 (factory option)

PFB-BA-e-1741 5
KERN (Type) PFB 600-2A PFB 1200-2A PFB 2000-2A
Trademark PFB 600-3 PFB 1200-2 PFB 2000-2
Readability (d) 0,01 g 0,01 g 0,01 g
Weighing range (max) 600 g 1200 g 2000 g
Reproducibility 0,01g 0,01 g 0,02 g
Linearity ±0,03 g ±0,03 g ±0,05 g
Smallest part weight for
piece counting 20 mg 20 mg 20 mg
Reference quantities at
piece counting 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) 600 g (F1) 1000 g (F1) 2000 g (F1)
Warm-up time 2 hours
Stabilization time (typical) 3 sec.
Operating temperature + 15° C .... + 35° C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 315 x 210 x 156
Dimensions of wind screen
(B x D x H) mm 124 x 119 x 80
Weighing plate,
stainless steel (mm) Ø 120 Ø 120
Weight kg (net) 2 kg
Electric Supply
Input voltage weighing scales 12 V / 500 mA
Input voltage power supply unit 100 V – 240 V, 50/60 Hz
Interfaces RS232
Bluetooth 2.0 (factory option)
Bluetooth 4.0 (factory option)

6 PFB-BA-e-1741
KERN (Type) PFB 3000-2A PFB 6000-1A PFB 6000-2A
Trademark PFB 3000-2 PFB 6000-1 PFB 6000-2
Readability (d) 0,01 g 0,1 g 0,05 g
Weighing range (max) 3000 g 6000 g 6000 g
Reproducibility 0,02 g 0,1 g 0,05 g
Linearity ±0,05 g ± 0,3 g ± 0,15 g
Smallest part weight for
piece counting 20 mg 200 mg 200 mg
Reference quantities at
piece counting 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) 3000 g (F1) 6000 g (F1) 6000 g (F1)
Warm-up time 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 315 x 210 x 156
Dimensions of wind screen
(B x D x H) mm 124 x 119 x 80 -
Weighing plate,
stainless steel (mm) Ø 120 155 x 145
Weight kg (net) 2 kg
Electric Supply
Input voltage weighing scales 12 V / 500 mA
Input voltage power supply unit 100 V – 240 V, 50/60 Hz
Interfaces RS232
Bluetooth 2.0 (factory option)
Bluetooth 4.0 (factory option)

PFB-BA-e-1741 7
2 Declaration of conformity
The current EC/EU Conformity declaration can be found online in:
www.kern-sohn.com/ce

8 PFB-BA-e-1741
3 Appliance overview
3.1 Keyboard overview
Button
Key
designation
Function
ON/OFF Turn on/off
ZERO Zeroing
TARE Taring
%
Enable calculation of percentage
Returning to weighing mode from calculation of
percentage mode
PCS Enable parts counting
In the piece count mode back to weighing mode
MODE Weighing units switch-over
Scroll forward in menu
PRINT Print out weighing result
Exit menu / back to weighing mode.

PFB-BA-e-1741 9
3.2 Overview of display
Display Description
Zero indicator
Net weight value display
οStability display
Pcs Parts counting application
% Calculation of percentage application
Tolerance weighing application
Capacity display
The capacity display moves from the left to the right and proceeds
equally to the weight loaded onto the weighing balance. Its full width
is reached at maximum load.
This is an analogue display of the current allocation of the weighing
area.
Weighing Units
(g) Gramm
(kg) Kilogramm
(ct) Carat
(mom) Momme
(oz) Ounce
(ozt) Fine ounce
(dwt) Penny weight
(tl.h) Tael (Taiwan)
(t.lt) Troy Tael
(t) Tola

10 PFB-BA-e-1741
4 Basic Information (General)
4.1 Proper use
The balance you purchased is intended to determine the weighing value of material
to be weighed. It is intended to be used as a “non-automatic balance”, i.e. the
material to be weighed is manually and carefully placed in the centre of the weighing
pan. As soon as a stable weighing value is reached the weighing value can be read.
4.2 Improper Use
Do not use balance for dynamic weighing. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results can be
displayed due to the “stability compensation“. (Example: Slowly draining fluids from a
container on the balance.)
Do not leave permanent load on the weighing pan. This may damage the measuring
system.
Impacts and overloading exceeding the stated maximum load (max) of the balance,
minus a possibly existing tare load, must be strictly avoided. Balance may be
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.
4.3 Warranty
Warranty claims shall be voided in case
•Our conditions in the operation manual are ignored
•The appliance is used outside the described uses
•The appliance is modified or opened
•Mechanical damage 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-1741 11
4.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
balance and, if applicable, the testing weight, must be checked regularly. The
responsible user must define a suitable interval as well as type and scope of this test.
Information is available on KERN’s home page (www.kern-sohn.com with regard to
the monitoring of balance test substances and the test weights required for this. In
KERN's accredited DKD calibration laboratory test weights and balances may be
calibrated (return to the national standard) fast and at moderate cost.
5 Basic Safety Precautions
5.1 Pay attention to the instructions in the Operation Manual
Carefully read this operation manual before setup and
commissioning, even if you are already familiar with KERN
balances.
All language versions contain a non-binding translation.
The original German is binding.
5.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
6 Transport and storage
6.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
6.2 Packaging / return transport
Keep all parts of the original packaging for a possibly required
return.
Only use original packaging for returning.
Prior to dispatch disconnect all cables and remove loose/mobile
parts.
Reattach possibly supplied transport securing devices.
Secure all parts such as the glass wind screen, the weighing
platform, power unit etc. against shifting and damage.

12 PFB-BA-e-1741
7 Unpacking, Setup and Commissioning
7.1 Installation Site, Location of Use
The balances are designed in a way that reliable weighing results are achieved in
common conditions of use.
You will work accurately and fast, if you select the right location for your balance.
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, vapours and dust;
•Do not expose the device to extreme dampness for longer periods of time.
Non-permitted condensation (condensation of air humidity on the appliance)
may occur if a cold appliance is taken to a considerably warmer environment.
In this case, acclimatize the disconnected appliance for ca. 2 hours at room
temperature.
•Avoid static charge of goods to be weighed or weighing container.
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.
7.2 Unpacking and checking
Remove device and accessories carefully from packaging, remove packaging
material and place device at the planned work place. Verify that there has been no
damage and that all packing items are present.
Scope of delivery / serial accessories:
•Balance
•Weighing pan
•Mains adapter
•Operating manual
•Wind shield (only models PFB 120-3A, PFB 200-3 A, PFB 300-3 A,
PFB 1200-2A, PFB 2000-2A, PFB 3000-2A)

PFB-BA-e-1741 13
7.2.1 Placing
Remove transport securing
(only models PFB 120-3A, PFB 200-3A, PFB 300-3A)
Installation of weighing plate
The balance must be installed in a way that the weighing plate is exactly in
horizontal position.
Install wind shield
(only models PFB 120-3A, PFB 200-3 A, PFB 300-3 A, PFB 1200-2A,
PFB 2000-2A, PFB 3000-2A)
Levelling
Exact alignment and stable installation are an essential requirement for
repeatable results. You can compensate for minor unevenness or tilts of the
footprint by levelling the weighing balance.
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.

14 PFB-BA-e-1741
7.3 Mains connection
Select a country-specific power plug and insert it in the power unit.
Check, whether the voltage acceptance on the scales is set correctly.
Do not connect the
scales to the power grid unless the information on
the scales (sticker) matches the local mains voltage.
Only use KERN original mains adapter. Using other makes requires
consent by KERN.
Important:
Before starting your weighing balance, check the mains cable for
damage.
Ensure that the power unit does not come into contact with liquids.
Ensure access to power plug at all times.
7.4 Connecting to power supply
Supply power to balance via mains adapter.
Press the ON/OFF key to light up the display.
The balance will carry out a display test. As soon as the weight display appears,
the balance is ready for weighing.
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 connection, accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
7.5 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.

PFB-BA-e-1741 15
7.6 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.
•Observe stable environmental conditions. A warming up time (see chapter
1) is required for stabilization.
•Prepare adjustment weight, see chap. 1.
The adjustment weight you use is dependent on the capacity of the
balance. Perform adjustment as close as possible to the maximum load.
Info about test weights can be found on the Internet at: http://www.kern-
sohn.com
•
Ensure that there are no objects on the weighing pan.
Procedure:
In weighing mode press and hold the MODE key until <UnLoAd> is displayed on
the screen.
or
call up menu item “P2 CAL“ and confirm by pressing the ZERO key.
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 stability control.
After successful adjustment „PASS“ will be displayed. The balance returns
automatically into weighing mode.
Take away adjustment weight

16 PFB-BA-e-1741
7.7 Linearization
Linearity shows the greatest deviation of a weight display on the scale to the value of
the respective test weight according to plus and minus over the entire weighing
range.
If linearity deviation is discovered during a monitoring of test resources, you can
improve this by means of linearization.
•In balances with a resolution of > 15 000 dividing steps carrying out a
linearisation is recommended.
•Carrying out linearization is restricted to specialist staff possessing well
acquainted with the workings of weighing scales.
•The test weights to be used must be adapted to the weighing scale’s
specifications; see chapter “Monitoring of test equipment”.
•Observe stable environmental conditions. Stabilisation requires a certain
warm-up time.
•After successful linearisation you will have to carry out calibration;
see chapter “Monitoring of test equipment”.
•Provide the adjustment weights required as shown in table 1.
Table 1 Linearisation points:
Max LoAd 1 LoAd 2 LoAd 3 LoAd 4
120 g 30 g 60 g 90 g 120 g
200 g 50 g 100 g 150 g 200 g
300 g 50 g 100 g 200 g 300 g
1200 g 300 g 600 g 900 g 1200 g
2000 g 500 g 1000 g 1500 g 2000 g
3000 g 0.5 kg 1 kg 2 kg 3 kg
6000 g 1 kg 2 kg 4 kg 6 kg

PFB-BA-e-1741 17
Procedure:
Switch on weighing scales and press and hold the MODE key during the self-test
until “F1 Unt“ is shown on the screen.
Press the MODE key repeatedly until “tECH“ is shown on the screen.
Confirm with ZERO button.
Press , and successively, „P1 Lin“ appears
Again press the ZERO key until “Pin“ reappears.
Press , and one after the other, whereupon “LoAd 0“ will be
shown. Ensure that there are no objects on the weighing pan.
An audio sound indicates the end of the stability control and “LoAd 1“ will be
shown.

Place the first adjustment weight. An audio sound will follow after stability control
and „LoAd 2“ will be shown. Take away adjustment weight.
Place the second adjustment weight. An audio sound will follow after stability
control and „LoAd 3“ will be shown. Take away adjustment weight.

18 PFB-BA-e-1741
Put on the third adjustment weight. An audio sound will follow after stability control
and „LoAd 4“ will be shown. Take away adjustment weight.
Place the fourth adjustment weight (max). An audio sound will follow after stability
control and „LoAd 0“ will be shown. Take away adjustment weight.
Ensure that there are no objects on the weighing pan.
An audio sound will follow after stability control and “LoAd 4“ will be shown.
Place fourth adjustment weight again. An audio sound will follow after stability
control and “LoAd 3“ will again be shown. Take away adjustment weight.
Put on the third adjustment weight. An audio sound will follow after stability control
and „LoAd 2“ will be shown. Take away adjustment weight.
Place the second adjustment weight. An audio sound will follow after stability
control and „LoAd 1“ will be shown. Take away adjustment weight.
Place the first adjustment weight. An audio sound will follow after stability control
and „LoAd 0“ will be shown. Take away adjustment weight. Ensure that there are
no objects on the weighing pan.
An audio sound will follow after stability control and the weighing scale will change
automatically into weighing mode.


PFB-BA-e-1741 19
8 Basic Operation
8.1 Start-up
Press the ON/OFF key to light up the display.
The balance will carry out a display test. As soon as the weight display appears,
the balance is ready for weighing.
8.2 Switching Off
Press ON/OFF button, the display disappears
8.3 Zeroing
Resetting to zero corrects the influence of light soiling on the weighing plate.
Unload the balance
Press the ZERO button, the zero display and the indicator will appear.
8.4 Simple weighing
1. Place goods to be weighed on balance.
2. Wait for stability display .
3. Read weighing result.
Overload warning
Overloading exceeding the stated maximum load (max) of the device, minus a
possibly existing tare load, must be strictly avoided. This could damage the
instrument.
Exceeding maximum load is indicated by the display of „----“ and an audio
sound. Unload weighing system or reduce preload.

20 PFB-BA-e-1741
8.5 Switch-over weighing unit
How to enable weighing units:
Switch on weighing scales and press and hold the MODE key during the self-test
until “F1 Unt“ is shown on the screen.
Press the ZERO key, the first weighing unit with the current setting will be
displayed.
Press the MODE key to enable [on] / disable [off] the weighing unit.
Use the ZERO key, to confirm. The next unit will be shown.
Press the MODE key to enable [on] / disable [off] the displayed weighing unit.
Use the ZERO key, to confirm. The next unit will be shown.
Repeat sequence for each weighing unit.
Switch-over weighing unit:
Press the MODE key to switch the display in weighing mode to the previously
enabled weighing units.