KERN CWS User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [email protected]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating instruction
Counting scale
KERN CWS
Version 1.0
12/2006
GB
CWS-BA-e-0610

CWS-BA-e-0610
2
GB KERN CWS
Version 1.0 12/2006
Operating instruction
Counting scale
Table of Contents
1Technical data__________________________________________________ 4
2Declaration of conformity ________________________________________ 5
3Appliance overview _____________________________________________ 6
3.1 Dimensions: _____________________________________________________ 6
3.2 Overview visual displays / keyboard _________________________________ 7
3.2.1 Display quantity _______________________________________________________ 7
3.2.2 Display weight ________________________________________________________ 8
3.2.3 Display reference weight ________________________________________________ 8
3.3 Keyboard overview________________________________________________ 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 ______________________________________________________ 11
7Unpacking, Setup and Commissioning ____________________________ 12
7.1 Installation Site, Location of Use ___________________________________ 12
7.2 Unpacking ______________________________________________________ 12
7.2.1 Placing _____________________________________________________________ 13
7.2.2 Scope of delivery _____________________________________________________ 13
7.3 Mains connection ________________________________________________ 13
7.4 Initial Commissioning ____________________________________________ 13
7.5 Storage battery operation (optional)_________________________________ 14
7.6 Adjustment _____________________________________________________ 14
8Basic operation________________________________________________ 16
8.1 Turn on/off______________________________________________________ 16

CWS-BA-e-0610 3
8.2 Automatic switch-off function AUTO OFF ____________________________ 16
8.3 Balance zero display/zero tracking__________________________________ 16
8.4 Stability display _________________________________________________ 16
8.5 Taring__________________________________________________________ 17
8.6 Simple operating mode ___________________________________________ 17
9Parts counting_________________________________________________ 18
9.1 Start of add-up process ___________________________________________ 18
9.2 Determination of the reference weight by weighing ____________________ 19
9.2.1 Reference piece number 10_____________________________________________ 19
9.2.2 Reference piece number 5, 25, 50 or 100 __________________________________ 20
9.2.3 Optional reference piece number_________________________________________ 21
9.2.4 Optional reference piece number without using the - key____________________ 22
9.3 Numeric entering of the reference weight ____________________________ 23
9.4 Retrieving a stored reference weight via ID no.________________________ 24
10 PRE-TARE __________________________________________________ 25
11 Storing a reference weight_____________________________________ 26
11.1 Storing by ID numbers____________________________________________ 26
11.2 Deleting a stored reference weight__________________________________ 27
11.3 Simultaneous deleting of all ID memories ____________________________ 28
12 Adding _____________________________________________________ 29
12.1 Manual adding-up by pressing the M+ key ___________________________ 29
12.2 Automatic adding-up _____________________________________________ 30
12.3 Displaying a sum total ____________________________________________ 30
12.4 Deleting all stored weighing data ___________________________________ 30
12.5 M- function _____________________________________________________ 30
13 Weighing/counting with tolerance range _________________________ 31
13.1 Parameter selection (see also chapter 14.2) __________________________ 31
13.2 Display of set tolerance limits______________________________________ 33
13.3 Changing set tol. limits by using the key instead of setting in menu____ 33
14 The menu ___________________________________________________ 34
14.1 Navigation in the menu ___________________________________________ 34
14.2 Menu overview __________________________________________________ 35
15 Description of individual functions______________________________ 41
15.1 ACAI function (automatic counting accuracy improvement = automatic
reference optimisation) _________________________________________________ 41
15.1.1 ACAI automatic mode _______________________________________________ 41
15.1.2 ACAI manual mode _________________________________________________ 43
15.2 AWA function (audible weighing assist = acoustic fill-to-target) _________ 44
15.2.1 Enabling/disabling the AWA function ____________________________________ 44
16 Data output RS 232C__________________________________________ 47
16.1 Technical specifications of interface ________________________________ 47
16.2 Data output _____________________________________________________ 48

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1 Technical data
KERN CWS 3K0.5 CWS 6K1 CWS 15K2 CWS 30 K5
Readability (d) 0.5 g 1 g 2 g 5 g
Weighing range (max) 3 kg 6 kg 15 kg 30 kg
Reproducibility 0.5 g 1 g 2 g 5 g
Linearity ± 0.5 g ± 1.0 g ± 2 g ± 5 g
Stabilization time 2 s 2 s 2 s 2 s
Recommended adjustment
weight, not added (class) 3 kg (M1) 6 kg (M1) 15 kg (M1) 30 kg (M1)
Weighing unit g g g g
Minimum piece weight 0.05 g 0.1 g 0.25 g 0.5 g
Warming up time (operat-
ing temperature) 30 min 30 min 30 min 30 min
Reference piece numbers
for piece count 5, 10, 25, 50, 100, optional
Net weight (kg) 4.7 kg
Permissible ambient condi-
tion -10° C to 40° C
Humidity of air 15% - 85% (non-condensing)
Weighing plate, stainless
steel 300 x 210 mm
Dimensions of the housing
plastic material (B x D x H) 315 x 331 x 126 mm
Mains connection Adapter 230 V, 50 Hz, balance 7.5 V/700 mA
Rechargeable battery (op-
tional) Operating time ca. 80 hrs. / loading time ca. 15 hrs.
Interface RS232C
Auto OFF function After 5 min without change of load

CWS-BA-e-0610 5
2 Declaration of conformity
KERN & Sohn GmbH
D-72322 Balingen-Frommern
Postfach 4052
E-Mail: [email protected]
Tel: 0049-[0]7433- 9933-0
Fax: 0049-[0]7433-9933-149
Internet: www.kern-sohn.de
Declaration of conformity
Declaration of conformity for apparatus with CE mark
Konformitätserklärung für Geräte mit CE-Zeichen
Déclaration de conformité pour appareils portant la marque CE
Declaración de conformidad para aparatos con marca CE
Dichiarazione di conformitá per apparecchi contrassegnati con la marcatura CE
English We hereby declare that the product to which this declaration refers conforms with the fol-
lowing standards.
Deutsch Wir erklären hiermit, daß das Produkt, auf das sich diese Erklärung bezieht, mit den nach-
stehenden Normen übereinstimmt.
Français Nous déclarons avec cela responsabilité que le produit, auquel se rapporte la présente
déclaration, est conforme aux normes citées ci-après.
Español Manifestamos en la presente que el producto al que se refiere esta declaración est´´a de
acuerdo con las normas siguientes
Italiano Dichiariamo con ciò che il prodotto al quale la presente dichiarazione si riferisce è confor-
me alle norme di seguito citate.
Electronic Scale: KERN CWS
Mark applied EU Directive Standards
89/336/EEC
EMC
73/23/EEC
LVD
EN 61326 1997+A1 : 1998, +A2 : 2001, +A3 : 2003 Class A
EN 60950
Date: 10.01.2007 Signature:
Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen, Tel. +49-[0]7433/9933-0,Fax +49-[0]7433/9933-149

CWS-BA-e-0610
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RS-232C connection
Levelling foot
Removable display
3 Appliance overview
3.1 Dimensions:
A
ir bubble
Cover verification switch
Battery compartment
Mains adapte
r
Mass terminal
192
331
1
26
31
5
280
300
210
221

CWS-BA-e-0610 7
3.2 Overview visual displays / keyboard
Quantity
Weight Reference weight
3.2.1 Display quantity
Here, all the parts placed on balance are immediately displayed by number.
Overlay Windicates:
TOTAL Display sum total
M+ Adding-up weighing data
Placed goods to be weighed too light
+ Goods to be weighed above tolerance limit
TOL 3Goods to be weighed within tolerance range
- Goods to be weighed below tolerance limit

CWS-BA-e-0610
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3.2.2 Display weight
Here, the weight of your goods is displayed.
Overlay W/cindicates:
Stability display
PRE-
TARE Stored tare value
aZeroing display
3.2.3 Display reference weight
Here, the reference weight of a sample is displayed in [g]. This value is either entered
by user of calculated by balance.
Overlay Tindicates:
AUTO
OPTIM. Automatic reference optimisation (weight within ACAI range, see chpt. 15.1)
N Number of additions in summation memory
Battery power supply

CWS-BA-e-0610 9
3.3 Keyboard overview
Choice Function
•Transmit counting, weight or reference data
•Call up total memory
•Addition in total memory
•Display of set tolerance limit
•Subtraction in summation memory
•Set/retrieve acoustic fill to target (AWA function chpt.
15.2))
•Delete reference weight
- •Number keys
•Deletes input of numeric key
•Retrieve reference weight from memory
•Store reference weight in ID memory
•Numeric entry reference weight
•Enter reference weight through weighing
•Confirm/store input
•Turn on/off balance
•Zeroing key
•Back to weighing mode
•Numeric input tare value
•Taring key

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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 mate-
rial 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.
4.2 Improper Use
Do not use balance for dynamic weighing. In the event that small quantities are re-
moved or added to the material to be weighed, incorrect weighing results can be dis-
played 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 dam-
age 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 weigh-
ing 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 or damage by media, liquids, natural wear and tear
•The appliance is improperly set up or incorrectly electrically connected
•The measuring system is overloaded

CWS-BA-e-0610 11
4.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the bal-
ance and, if applicable, the testing weight, must be checked regularly. The responsi-
ble user must define a suitable interval as well as type and scope of this test. Infor-
mation 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.
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 appli-
ance itself when unpacking for possible visible damage.
6.2 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.

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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 electric-
ity accumulations or instable power supply occur. Change location or remove source
of interference.
7.2 Unpacking
Carefully remove the balance from the packaging, remove packing material and
place balance at the intended workstation.

CWS-BA-e-0610 13
Mass terminal
7.2.1 Placing
Level balance with foot screws until the air bubble of the water balance is in the pre-
scribed circle.
7.2.2 Scope of delivery
Serial accessories:
•Balance
•Weighing plate
•Detachable display part
•Mains power supply
•Operating Manual
7.3 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.
Connect the housing to earth, if there is a suspicion that static electricity could pose a
problem.
7.4 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 warm-
ing 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.
Mains adapte
r

CWS-BA-e-0610
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7.5 Storage battery operation (optional)
Installation:
1. Disconnecting the power pack from the balance
2. Unscrew both M3 screws and remove the cover of the battery compartment.
3. Connect wires in the battery compartment to the battery
Connect red wire to positive (+/red) terminal and black wire to negative
(-/black) terminal. Otherwise there is a danger of explosion.
4. Insert battery in compartment and reattach the cover with the help of the
screws.
5. Turn on the balance and check whether the balance is working normally.
Loading the battery
Use the provided power pack for battery charging.
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 15 hours.
•The display [Lo BAT] indicates that the capacity of the battery is nearly ex-
hausted. Connect the power adaptor as soon as possible to change the bat-
tery.
•Whilst working in battery mode, [ T] will be displayed above the battery
symbol
•It is possible to use the balance during charging
•Charge the battery at a temperature ranging between 5°C and 35°C
•Charge the battery at regular intervals (every 3-6 months), when the balance
is not put to use for a longer period of time.
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 re-
ceive accurate measuring values it is also recommended to adjust the balance peri-
odically in weighing operation.
Screws
Batter
y
“+” electrode red
“ - ”electrode black
Battery compartment

CWS-BA-e-0610 15
Procedure when adjusting:
Observe stable environmental conditions. A warming up time (see chapter 1) is re-
quired for stabilization. Ensure that there are no objects on the weighing plate.
1. Press the PRINT key and keep on pressing it
when balance is turned off. To achieve this,
turn on the balance by using the ON/OFF key.
"CAL" appears on the display.
2. Press button
0.000
Kg
CAL
3. Weight value of recommended adjustment
weight is flashing on display. However, you
may enter a value of your choice via the num-
ber keys. *
CAL 0
Kg
6.000
4. Press button The display stops flashing.
CAL 0
Kg
6.000
5. Ensure that there are no objects on the weigh-
ing plate.
Press button After successfully storing
the zero point "CAL F" will appear on the dis-
play.
CAL F
Kg
6.000
6. Carefully place adjusting weight in the centre
of the weighing plate.
Press key , adjustment will take place.
Once adjustment is complete, the display will
return to step 1. Remove the adjusting weight
and turn off the balance using the ON/OFF
key. Reattach the removed adjustment switch
cover.
In case of an adjustment error or an incorrect
adjusting weight, the display will not return to
step 1. Press the ON/OFF key and repeat the
adjustment procedure.
6.000
Kg
CAL
* The adjustment should be made with the recommended adjustment weight (see
chap. 1 "Technical data"). Weights of different nominal values may be used for cali-
bration but are not optimal for technical measuring.
Info about adjustment weights can be found on the Internet at: http://www.kern-
sohn.com

CWS-BA-e-0610
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8 Basic operation
8.1 Turn on/off
Turn balance on/off by using the ON/OFF
key.
The balance will carry out a self-test As
soon as the weight display shows "0" in
all the three display windows your bal-
ance is ready to weigh.
a
0
0.000 Kg 0.00000 g
(or last used reference weight)
8.2 Automatic switch-off function AUTO OFF
To save battery life, the balance is equipped with an Auto OFF function.
This switches off the balance after a time of approximately 5 minutes after the last
weighing or key operation. It is possible to enable/disable the Auto OFF function (F-
04-05) in the menu (see chpt. 14.2).
8.3 Balance zero display/zero tracking
Environmental influences can lead to the exact figure of zero not being displayed in
spite of an empty weighing dish. It is, however, possible to reset your balance to zero
at any time and thus ensure that weighing really does commence at zero. Setting to
zero when a weight is applied is only possible within a certain type-dependent range.
In the event that the balance cannot be reset to zero with an applied weight, this
range has been exceeded.
To reset the balance to zero, press key . A triangle [W] pops up next to the [ a ]
symbol on the display.
Notice:
The balance has an automatic zero reset function (zero tracking). This function (F-
04-01) is activated by the factory in order to compensate the normal zero shift due to
variations in temperature, air pressure etc.
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 compensa-
tion“ in the balance. (Example: Slowly draining fluids from a container on the bal-
ance).
When apportioning involves small variations of weight, it is advisable to switch off this
function.
If Zero-Tracking however is switched off, the weighing display becomes more busy.
8.4 Stability display
If in the display next to the [ ] symbol a circle [c] appears, the balance is a stable
status. If the status is instable the [c] display disappears.

CWS-BA-e-0610 17
8.5 Taring
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.
Place empty tare container on the weighing plate. The total
weight of the container is displayed.
Press the TARE key.
After dead stop control was carried out, the display is reset
to "0". The weight of the container is now internally saved.
The zero display and the arrow next to the "PRE-TARE"
symbol appear.
a
0.000
Kg
a
0.650
Kg
a
0.000
Kg
Place the goods to be weighed into the tare container. Read the weight of the goods
on the display.
Information:
The balance is able to only store one taring value at a time.
When the balance is unloaded the saved taring value is displayed with negative
sign.
To delete the stored tare, unload the weighing plate and then press the TARE
key; the [W] display next to "(PRE)-TARE" disappears.
The taring process can be repeated any number of times. The limit is reached when
the whole weighing range is exhausted.
8.6 Simple operating mode
If desired, the balance can be installed in simple operating mode. For this purpose
enable function F-01-01 ( "1"-) in the menu (see chpt. 14.2)
In this mode the use of keys is restricted as follows:
-
In addition the reference weight can be determined by simply weighing (see chpt.
9.2).

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9 Parts counting
With parts counting you can either count parts into a container or remove parts from
a container. To count a greater number of parts the average weight 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.
9.1 Start of add-up process
Turn on balance by pressing the ON/OFF
key. If the display is not on zero, press the
-key.
The three LEDs on the keys
"piece weight by" are flashing. This is a
request to enter the method you wish to
apply for entering the reference weight.
a
0
0.000 Kg 0.00000 g
Through the selection of the keys the following options are available to enter or retrieve
the reference weight:
Retrieving a stored reference
weight via ID no. (chpt.. 9.4) Numeric input of reference weight (Chpt.. 9.3) Determination of reference weight by weighing (chpt.. 9.2 )
Information:
You can return to this point during operation at any time by pressing the CE key
without deleting your settings (tare value, M+, tolerance limits).

CWS-BA-e-0610 19
9.2 Determination of the reference weight by weighing
9.2.1 Reference piece number 10
1. Turn on balance by pressing the ON/OFF
key. The three LEDs on the keys "piece
weight by" are flashing. If this is this not the
case, press the - key. If desired, place
the tare container on the balance
2. Press button
A tare container will automatically be tared.
a
10
0.000 Kg
ADD
g
If required, tare by using TARE
3. Place10 single pieces to act as reference
weights on the balance. The weight of all 10
pieces will be shown
a
10
0.056 Kg
ADD
g
a
10
0.056 Kg
5.61200
g
4. Press button The display shows "------"
for a moment, while the reference weight is
being calculated. Dead stop control is carried
out and the calculated reference weight ap-
pears on the display.
Weight of pieces Calculated reference
weight
Note:
If "Add ##" appears on the display, you can
use this option to carry out reference optimi-
sation as the size of the sample was insuffi-
cient for an accurate count.
Either add the required piece number or ig-
nore the message "Add ##" and continue the
counting process by pressing the ENTER
key. (This, however, will not give accurate
results). See also function "F-01-02", chpt..
14.2
5. Now you can place the parts to be counted
onto the weighing plate. All piece number pa-
rameters of your load are displayed.
For further information about reference opti-
misation see chpt. 15.1).
a
10
0.004 Kg
ADD 15

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9.2.2 Reference piece number 5, 25, 50 or 100
1. Turn on balance by pressing the ON/OFF
key. The three LEDs on the keys "piece
weight by" are flashing. If this is this not
the case, press the - key. If desired,
place the tare container on the balance
2. Press button
A tare container will automatically be
tared.
a
10
0.000 Kg
ADD
g
If required, tare by using TARE
3. To select the reference piece number
press the key repeatedly until the de-
sired reference piece number appears.
10 →5 →25 →50 →100 →10.
The larger the reference quantity, the
higher the counting exactness.
a
50
0.000 Kg
ADD
g
4. Place the selected piece number to act as
reference weight on the balance. The
weight of the pieces will be displayed.
The key is flashing.
a
50
0.280 Kg
ADD
g
a
50
0.280 Kg
5.61200
g
5. Press button The display shows
"------" for a moment, while the reference
weight is being calculated. Dead stop
control is carried out and the calculated
reference weight appears on the display.
Note:
If "Add ##" appears on the display, you can
use this option to carry out reference optimi-
sation as the size of the sample was insuffi-
cient for an accurate count. Place the re-
quired pieces on the balance for reference
optimisation.
Weight of pieces Calculated reference weight
Now you can place the parts to be counted onto the weighing plate.
All piece number parameters of your load are displayed.