KERN PCB 250-3 User manual
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-mail:info@kern-sohn.com
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating Manual
Precision balance
KERN PCB
Version 1.8
05/2017
GB
PCB-BA-e-1718
PCB-BA-e-1718
2
GB
KERN PCB
Version 1.8 05/2017
Operating Manual
Compact balance
Table of Contents
1Technical Data ............................................................................................... 4
2Declaration of conformity ............................................................................. 7
3Basic Information (General).......................................................................... 8
3.1 Proper use................................................................................................................................. 8
3.2 Improper Use............................................................................................................................. 8
3.3 Warranty.................................................................................................................................... 8
3.4 Monitoring of Test Resources................................................................................................. 8
4Basic Safety Precautions.............................................................................. 9
4.1 Pay attention to the instructions in the Operation Manual .................................................. 9
4.2 Personnel training.................................................................................................................... 9
5Transportation & Storage.............................................................................. 9
5.1 Testing upon acceptance ........................................................................................................ 9
5.2 Packaging.................................................................................................................................. 9
6Unpacking, Setup and Commissioning ....................................................... 9
6.1 Installation Site, Location of Use............................................................................................ 9
6.2 Unpacking/erection ................................................................................................................ 10
6.3 Mains connection................................................................................................................... 10
6.4 Operation using a (rechargeable) battery (optional)........................................................... 11
6.5 Connection of peripheral devices......................................................................................... 11
6.6 Initial Commissioning ............................................................................................................ 12
6.7 Linearisation ........................................................................................................................... 12
6.8Adjustment.............................................................................................................................. 15
6.9 Adjustment.............................................................................................................................. 15
6.10 Underfloor weighing............................................................................................................... 16
7Operation elements ..................................................................................... 17
7.1 Overview of display................................................................................................................ 17
7.2 Keyboard overview................................................................................................................. 17
8Basic Operation........................................................................................... 18
Start-up................................................................................................................................................. 18
Switching Off ....................................................................................................................................... 18
Weighing............................................................................................................................................... 18
Taring.................................................................................................................................................... 18
PRE-TARE-Function............................................................................................................................ 19
Plus/minus weighings......................................................................................................................... 20
Parts counting...................................................................................................................................... 20
Net-total weighings ............................................................................................................................. 21
Percent determination......................................................................................................................... 22
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9Menu ............................................................................................................. 23
9.1 Navigation in the menu.......................................................................................................... 23
9.2 Menu overview........................................................................................................................ 26
9.3 Description of individual menu items .................................................................................. 28
Weighing Units .................................................................................................................................... 28
Dosing and Zero-tracking................................................................................................................... 29
Selection adjustment weight.............................................................................................................. 29
Filter...................................................................................................................................................... 31
Display background illumination....................................................................................................... 32
Animal weighing function................................................................................................................... 33
Reset to factory setting...................................................................................................................... 34
9.4 Interface parameters .............................................................................................................. 35
Data transfer mode.............................................................................................................................. 35
printout................................................................................................................................................. 36
Baud rate.............................................................................................................................................. 37
10 Data output RS 232 C .................................................................................. 37
10.1 Technical Data ........................................................................................................................ 37
10.2 Pin allocation of balance output bushing:........................................................................... 37
10.3 Explanation of the data transfer............................................................................................ 38
10.4 Output on bar code printer.................................................................................................... 40
11 Service, maintenance, disposal.................................................................. 40
11.1 CLEANING............................................................................................................................... 40
11.2 Service, maintenance............................................................................................................. 40
11.3 Disposal................................................................................................................................... 40
12 Instant help................................................................................................... 41
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1 Technical Data
KERN PCB 100-3 PCB 200-2 PCB 250-3 PCB 350-3
Readability (d) 0.001 g 0.01 g 0.001 g 0.001 g
Weighing range (max) (d) 100 g 200 g 250 g 350 g
Taring range (subtractive) 100 g 200 g 250 g 350 g
Reproducibility 0.001 g 0.01 g 0.001 g 0.002 g
Linearity ±0.003 g ± 0.02 g ±0.005 g ±0.005 g
Minimum unit weight at
piece counting 0.002 g 0.02 g 0.002 g 0.002 g
Warm-up time 2 hours
Reference quantities at
piece counting 5, 10, 20, 25, 50
Weighing Units Details „Weighing units“ see chpt. 9.3
Recommended adjustment
weight, not added (class)
Details for „Selection of the
Adjustment weight“ in ch. 9.3
100 g (F1) 200 g (M1) 200 g (F1) 300 g (F1)
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 163 x 245 x 79
Windscreen mm Ø 106,
high 42 - Ø 106, high 42
Weighing plate mm Ø 81 Ø 105 Ø 81
Weight kg (net) 1,1
Electric Supply 220V-240V AC, 50 Hz / 9 V, 300 mA
Battery operation 9 V- compound battery (optional)
Rechargeable battery (optional)
Operating time 24 h with display background
illumination
Operating time 48 h without display background
illumination/loading time 8 h
Interface RS 232
Underfloor weighing standard
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KERN PCB 1000-1 PCB 1000-2 PCB 2000-1
PCB 2500-2
Readability (d) 0.1 g 0.01 g 0.1 g 0.01 g
Weighing range (max) (d) 1000 g 1000 g 2000 g 2500 g
Taring range (subtractive) 1000 g 1000 g 2000 g 2500 g
Reproducibility 0.1 g 0.01 g 0.1 g 0.01 g
Linearity ±0.2 g ±0.03 g ±0.2 g ±0.05 g
Minimum unit weight at
piece counting 0.2 g 0.02 g 0.2 g 0.02 g
Warm-up time 30 minutes 2 hours 30 minutes 2 hours
Reference quantities at
piece counting 5, 10, 20, 25, 50
Weighing Units Details „Weighing units“ see chpt. 9.3
Recommended adjustment
weight, not added (class)
Details for „Selection of the
Adjustment weight“ in ch. 9.3
1000 g (M1) 1000 g (F1) 2000 g (M1) 2000 g (F1)
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 163 x 245 x 79
Weighing plate mm 130 x 130
Weight kg (net) 1.4
Electric Supply 220V-240V AC, 50 Hz / 9 V, 300 mA
Battery operation 9 V- compound battery (optional)
Rechargeable battery (optional)
Operating time 24 h with display background
illumination
Operating time 48 h without display background
illumination/loading time 8 h
Interface RS 232
Underfloor weighing standard
PCB-BA-e-1718
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KERN PCB 3500-2 PCB 6000-1 PCB 6000-0 PCB 10000-1
Readability (d) 0.01 g 0.1 g 1 g 0.1 g
Weighing range (max) (d) 3500 g 6 kg 6 kg 10 kg
Taring range (subtractive) 3500 g 6 kg 6 kg 10 kg
Reproducibility 0.02 g 0.1 g 1 g 0.1 g
Linearity 0.05 g ± 0.3 g ± 2 g ± 0.3 g
Minimum unit weight at
piece counting 0.02 g 0.2 g 2 g 0.2 g
Warm-up time 2 hours 2 hours 30 minutes 2 hours
Reference quantities at
piece counting 5, 10, 20, 25, 50
Weighing Units Details „Weighing units“ see chpt. 9.3
Recommended adjustment
weight, not added (class)
Details for „Selection of the
Adjustment weight“ in ch. 9.3
3000 g (F1) 5000 g (F2) 5000 g (M2) 10 kg (F1)
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 163 x 245 x 79
Weighing plate mm 130 x 130 150 x 170 150 x 170 150 x 170
Weight kg (net) 1.4 2.0 2.0 2.0
Electric Supply 220V-240V AC, 50 Hz / 9 V, 300 mA
Battery operation 9 V- compound battery (optional)
Rechargeable battery
(optional)
Operating time 24 h with display background illumination
Operating time 48 h without display background
illumination/loading time 8 h
Interface RS 232
Underfloor weighing standard
PCB-BA-e-1718
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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
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.
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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.
Versions in other languages are non-binding translations.
The only binding version is the original document in German.
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,
mains adapter 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.
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 and weighing container.
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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/erection
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
Scope of delivery / serial accessories
•Balance
•Weighing plate
•Mains power supply
•Protective cover
•Operating Manual
•Windscreen (PCB 100-3, PCB 250-3, PCB 350-3)
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.
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6.4 Operation using a (rechargeable) battery (optional)
Lift-off the battery cover on the lower side of the balance. Connect 9 V compound
battery.
Replace the battery compartment cover.
For battery operation the balance has an automatic switch-off function which can be
activated or deactivated in the menu (chapter 9).
In weighing mode keep the PRINT-key pressed until [Unit] appears.
Press MODE key repeatedly until „AF“ appears.
Use the SET key, to confirm.
Use the MODE key to choose between the two following settings:
„AF on“:
In order to save the battery, the balance switches automatically
off after 3 minutes without weighing.
„AF off“:
Switch-off function deactivated.
Use the SET key to confirm. The balance returns to weighing mode.
If the batteries are run down, "LO" appears in the display. Press ON/OFF-key and
replace the batteries immediately.
If the balance is not used for a longer time, take out the batteries and store them
separately. Leaking battery liquid could damage the balance.
If there exists an optional rechargeable battery, it has to be connected in the battery
compartment via a separate plug-in socket. Now the mains adapter delivered with
the rechargeable battery must be applied.
6.5 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.
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6.6 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.
6.7 Linearisation
(only models PCB 250-3, PCB 350-3, PCB 2500-2, , PCB 3500-2,)
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.
•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 3.4 “Testing instruments control”.
•Observe stable environmental conditions. Stabilisation requires a
certain warm-up time.
•After successful linearization you will have to carry out calibration;
see chapter 3.4 “Testing instruments control”
Tab. 1: Adjustment points
Adjustment
weight
PCB 250-3 PCB 350-3 PCB 2500-2 PCB 3500-2
1.
50 g
50 g
500 g
500 g
2.
100 g
100 g
1000 g
1000 g
3.
150 g
200 g
1500 g
2500 g
4.
200 g
300 g
2000 g
3000 g
5.
250 g
350 g
2500 g
3500 g
Operation Display
How to carry out linearization:
Switch on balance
Press repeatedly until UNIT is
displayed
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Press repeatedly until LinEAr is
displayed
Ensure that there are no objects on the
weighing pan.
Start linearisation with . The value of the
first adjustment weight will be displayed.
(example)
Place adjustment weight and acknowledge by
. The scales will change to zero display.
Take away adjustment weight. After a short
time the value of the second adjustment weight
appears in the display.
(example)
Place second adjustment weight and
acknowledge by . The scales will change
to zero display.
Take away adjustment weight. After a short
time the value of the third adjustment weight
appears in the display.
(example)
Place third adjustment weight and
acknowledge by . The scales will change
to zero display.
Take away adjustment weight. After a short
time the value of the forth adjustment weight
appears in the display.
(example)
Place forth adjustment weight and
acknowledge by . The scales will change
to zero display.
Take away adjustment weight. After a short
time the value of the fifth adjustment weight
appears in the display.
(example)
PCB-BA-e-1718
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Place fifth adjustment weight and acknowledge
by . The scales will change to zero
display.
Take away adjustment weight. After a short
time CAL F is displayed.
Finally the balance will switch off automatically. Now the linearization is concluded
successfully.
In case of an adjustment error or incorrect adjusting weight the display will show an
error message; repeat linearization process.
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6.8 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.
6.9 Adjustment
The adjustment should be made with the recommended adjustment weight (see
chap. 1 "Technical data"). Adjustment is also possible with the weights of other
nominal values (see table 1), but not the optimum for measuring technique.
Procedure when adjusting:
Observe stable environmental conditions. A warming up time (see chapter 1) is
required for stabilization.
Turn on balance by pressing the ON/OFF key.
Press the MODE key and keep it pressed, in the display appears shortly
„CAL“. After that the exact size appears flashing in the display (see
chapter.9.3) of the adjustment weight.
Now set the adjusting weight in the centre of the weighing plate.
Press the SET key. Short time later there appears „CAL F“, then the
automatic return to the weighing mode. In the display there appears the
value of the adjustment weight.
An error during adjustment or the use of an incorrect adjusting weight will
result in an error message „CAL E“. Repeat adjustment.
Keep the adjustment close to the balance. Daily control of the weighing exactness is
recommended for quality-relevant applications.
PCB-BA-e-1718
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6.10 Underfloor weighing
Objects unsuitable for placing on the weighing scale due to size or shape may be
weighed with the help of the flush-mounted platform.
Proceed as follows:
•Switch off the balance
•Open closing cover at the balance bottom.
•Suspend hook for underfloor weighing carefully and completely.
•Place weighing balance over an opening.
•Attach load to hook and carry out weighing procedure.
Fig. 1: Setup of balance for underfloor weighing
CAUTION
▬Always ensure that all suspended objects are stable enough to
hold the desired goods to be weighed safely (danger of breaking).
▬Never suspend loads that exceed the stated maximum load (max)
(danger of breaking)
▬Always ensure that there are no persons, animals or objects that
might be damaged underneath the load.
After completing the underfloor weighing the opening on the bottom of
the balance must always be closed (dust protection).
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7 Operation elements
7.1 Overview of display
7.2 Keyboard overview
Key Designation Function
PRINT-key •Calculate weighing data via interface
•Call up menu (keep key pressed until UNIT appears)
SET key •Confirm settings in the menu
•Save and exit menu
MODE key
•How to select menu items
•Change settings in the menu
•Adjustment
TARE key •Taring
ON/OFF switch •Turn on/off
PCB-BA-e-1718
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8 Basic Operation
Start-up
ON
OFF
Press ON button.
The balance will carry out a self-test The balance is ready
for weighing when the weight display appears.
Switching Off
ON
OFF
Press OFF button, the display disappears
Weighing Place goods to be weighed on balance
Wait for standstill control, after the standstill control, the
weighing unit appears right hand in the display (e.g. g or
kg)
Read weighing result.
If the goods are heavier than the weighing range, the display
will show "Error" (=Overload), and a whistle is sounded.
Taring
Place an empty weighing container, the weight of the
weighing container will be displayed.
TA R E
Press the TARE button, the zero display disappears. The
tare weight is saved until it is deleted.
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Weigh the material, the net weight will be indicated.
The taring process can be repeated any number of times,
e.g. when adding several components for a mixture
(adding). The limit is reached when the whole weighing
range is exhausted.
The weight of the weighing container will be displayed as a
minus number after removing the weighing container.
The tare weight is saved until it is deleted.
Delete tare
TA R E
Unload the balance and press the TARE button, the zero
display appears.
PRE-TARE-
Function
MODE
CAL
Using this function the weight of a tare vessel is stored. Even
after turning off/on the weighing balance will continue working
with the saved tare value.
In weighing mode put tare vessel on the weighing plate
Press repeatedly the MODE key until „PtArE“ flashing
appears.
Use SET key to store the current weight on the weighing
plate as a PRE-TARE value.
Delete PRE-TARE
value
MODE
CAL
Remove all loads from the balance and press repeatedly
the MODE key until „PtArE“ flashing appears.
Use the SET key to confirm. The PRE-TARE value is
deleted, the zero display appears.
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Plus/minus
weighings
TA R E
For example unit weight control, fabrication control etc.
Put the nominal weight on the weighing plate and tare using
the TARE button.
Remove the nominal weight
Put the test objects subsequently on the weighing plate, the
respective deviation from the nominal weight is displayed
with the respective sign to „+“ and „-“.
According to the same procedure also packages with the
same weight can be produced, referring to a nominal
weight.
Back to weighing mode by pressing the TARE button.
Parts counting
MODE
CAL
SET
M
During piece counting parts can either be counted into a
container or out of a container.
To count a greater number of
parts the average wei
ght per part has to be determined with a
small quantity (reference quantity).
The larger the reference quantity, the higher the counting
exactness.
High reference must be selected for small parts or
parts with considerably different sizes.
The larger the
reference quantity, the more accurate the parts
counting.
The process has four steps:
Tare the weighing container
Determine the reference unit
Original weighing of reference weight
Count the items
In weighing mode press MODE key shortly. Reference
piece number „5PCS“appears flashing.
By pressing the MODE button several times other reference
quantities 5, 10, 20, 25 and 50 can be called up. Place as
many pieces to count on the weighing plate as the set
reference quantity requires.
Use the SET key to confirm. The balance is now in parts
counting mode counting all units on the weighing plate.
This manual suits for next models
12
Table of contents
Other KERN Scale manuals
