KERN CXB User manual

Operating instruction
Counting scales
CXB/CXP
CXB/CXP-BA-e-0711

CXB/CXP-BA-e-0711
2
Table of Contents
1Technical data__________________________________________________ 4
2Declaration of conformity ________________________________________ 6
3Appliance overview _____________________________________________ 7
3.1 Overview of display _______________________________________________ 9
3.1.1 Display weight _______________________________________________________ 10
3.1.2 Display reference weight _______________________________________________ 10
3.1.3 Display quantity ______________________________________________________ 10
3.1.4 Battery charge status display ____________________________________________ 10
3.2 Keyboard overview_______________________________________________ 11
4Basic Information (General)______________________________________ 13
4.1 Proper use______________________________________________________ 13
4.2 Improper Use ___________________________________________________ 13
4.3 Warranty _______________________________________________________ 13
4.4 Monitoring of Test Resources______________________________________ 14
5Basic Safety Precautions________________________________________ 14
5.1 Pay attention to the instructions in the Operation Manual_______________ 14
5.2 Personnel training _______________________________________________ 14
6Transport and storage __________________________________________ 14
6.1 Testing upon acceptance _________________________________________ 14
6.2 Packaging ______________________________________________________ 14
7Unpacking, Setup and Commissioning ____________________________ 15
7.1 Installation Site, Location of Use ___________________________________ 15
7.2 Unpacking ______________________________________________________ 15
7.2.1 Setup ______________________________________________________________ 16
7.2.2 Scope of delivery _____________________________________________________ 17
7.3 Mains connection ________________________________________________ 17
7.4 Battery power supply_____________________________________________ 17
7.5 Initial Commissioning ____________________________________________ 17
7.5.1 Start-up_____________________________________________________________ 18
7.5.2 Turn off – CXB models _________________________________________________ 18
7.5.3 Turn off/standby mode – CXP models _____________________________________ 18
7.5.4 Balance zero display __________________________________________________ 18
7.5.5 Stability display_______________________________________________________ 18
7.6 Adjustment with external weight ___________________________________ 19

CXB/CXP-BA-e-0711 3
8Parts counting_________________________________________________ 20
8.1 Determination of the reference weight by weighing ____________________ 20
8.2 Numeric entering of the reference weight ____________________________ 21
8.3 Automatic reference optimization___________________________________ 21
8.4 Store/call reference weight ________________________________________ 22
8.4.1 Save _______________________________________________________________ 22
8.4.2 Call-up _____________________________________________________________ 23
8.5 Count with tolerance control - Fill to target___________________________ 23
8.5.1 Set tolerance value for target number of pieces______________________________ 23
8.5.2 Set tolerance value for target weight ______________________________________ 24
9Taring________________________________________________________ 25
9.1 Determination of the tare weight by weighing_________________________ 25
9.2 Numerical input of tare (PRE-TARE)_________________________________ 26
10 Add ________________________________________________________ 28
10.1 Add up “number parts" ___________________________________________ 28
10.2 Add up “weight" _________________________________________________ 29
10.3 Delete stored values______________________________________________ 30
11 Application menu ____________________________________________ 30
11.1 Navigation in the menu ___________________________________________ 30
11.2 Menu overview [USER]____________________________________________ 31
12 Configurations menu _________________________________________ 32
12.1.1 Display background illumination________________________________________ 32
12.1.2 Setting the display speed_____________________________________________ 33
13 Data output _________________________________________________ 34
13.1 RS 232C interface________________________________________________ 34
13.2 Description of interface ___________________________________________ 35
13.2.1 Example: Setting an output format______________________________________ 39
14 Service, maintenance, disposal_________________________________ 40
14.1 Cleaning _______________________________________________________ 40
14.2 Service, maintenance_____________________________________________ 40
14.3 Disposal________________________________________________________ 40
15 Instant help _________________________________________________ 41
16 Appendix ASCII CODE table____________________________________ 42

CXB/CXP-BA-e-0711
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1 Technical data
CXB models:
KERN CXB 3K0.2 CXB 6K0.5 CXB 15K1 CXB 30 K2
Readability (d) 0.2 g 0.5 g 1 g 2 g
Weighing range (max) 3 kg 6 kg 15 kg 30 kg
Reproducibility 0.2 g 0.5 g 1 g 2 g
Linearity ± 0.4 g ± 1.0 g ± 2 g ± 4 g
Stabilization time 2 sec. 2 sec. 2 sec. 2 sec.
Recommended adjustment
weight, not added (class) 3 kg (M1) 5 kg (M1) 15 kg (M1) 30 kg (M1)
Weighing unit g g g g
Minimum piece weight 0.1 g 0.2 g 0.5 g 1 g
Warming up time (operat-
ing temperature) 30 min
Reference quantity freely selectable
Net weight (kg) 4 kg
Permissible ambient
condition -10° C to 40° C
Humidity of air 15% - 85% (non-condensing)
Weighing plate, stainless
steel 300 x 225 mm
Dimensions of the housing
(B x D x H) 300 x 330 x 110 mm
Mains connection Mains adapter 230 V, 50/60 Hz ; 9 V DC balance, 800 mA
Without backlit display:
Service life c. 200 hours / loading time ca. 8 hrs.
Rechargeable battery
With backlit display:
Operating time ca. 60h. / loading time ca. 8 hrs.

CXB/CXP-BA-e-0711 5
CXP models:
KERN CXP 30K2 CXP 75K5 CXP 150K10
Readability (d) 2 g 5 g 10 g
Weighing range (max) 30 kg 75 kg 150 kg
Reproducibility 2 g 5 g 10 g
Linearity ± 4 g ± 10 g ± 20 g
Stabilization time 2 sec. 2 sec. 2 sec.
Recommended adjustment
weight, not added (class) 20 kg (M1) 50 kg (M1) 100 kg (M1)
Weighing unit g g g
Minimum piece weight 0.5 g 1 g 2.5 g
Warming up time (operat-
ing temperature) 30 min
Reference quantity freely selectable
Net weight (kg) 8.9 kg
Permissible ambient
condition -10° C to 40° C
Allowable air humidity 15 % - 85 % (non-condensing)
Weighing plate, stainless
steel 400 x 300 mm
400 x 300 x 100 mm (platform)Dimensions of the housing
plastic material (B x D x H) 290 x 140 mm (terminal)
Voltage 230 V (AC)
Without backlit display:
Service life c. 200 hours / loading time ca. 16 hrs.
With backlit display:
Operating time ca. 60h. / loading time ca. 16 hrs.
Rechargeable battery
with back light + RS 232:
Operating time ca. 56h. / loading time ca. 16 hrs.
Data interface RS 232C

CXB/CXP-BA-e-0711 7
3 Appliance overview
CXB models:
1. Bubble level
2. Battery compartment
3. Mains cable connection
4. ON/OFF switch
1
3
4
2

CXB/CXP-BA-e-0711
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3 2 1
4
CXP models:
1. ON/OFF switch
2. Mains cable connection
3. RS 232 interface
4. Bubble level

CXB/CXP-BA-e-0711 9
Loading status display
3.1 Overview of display
CXB models:
Weight Reference weight
Loading status display Pieces
CXP models:
Weight Reference weight Pieces

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3.1.1 Display weight
Here, the weight of your goods is displayed.
Overlay Windicates:
aZeroing display
PRE-
TARE Tare in memory
Battery very low
3.1.2 Display reference weight
The reference weight of a sample is shown here. This value is either entered by user
of calculated by balance.
Overlay Windicates:
Placed number of pieces insufficient for reference calculation
Placed reference weight insufficient for reference calculation
3.1.3 Display quantity
Here, all the parts placed on balance are immediately displayed by number.
Overlay Windicates:
M+ Data in summation memory
Stability display
3.1.4 Battery charge status display
red Battery is almost discharged
green Battery is completely discharged

CXB/CXP-BA-e-0711 11
3.2 Keyboard overview
CXB models:
CXP models:

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Choice Function
- •Number keys
•Delete key
•Call counting with tolerance control
•Store reference weights in memory
•Call stored reference weights
•Addition in total memory
•Call up total memory
•Delete summation memory
•Enter reference weight through weighing
•Display reference weight stored last
•Enter target number of pieces
•Numeric entry reference weight
•Display reference weight stored last
•Enter target weight
•Zeroing key
•Back to weighing mode
CXB models
•Taring key
•Enter numerical tare
CXP models
•ON/OFF standby
•Taring key
•Enter numerical tare

CXB/CXP-BA-e-0711 13
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 weighings. 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

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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.

CXB/CXP-BA-e-0711 15
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 plastic cover and setup
balance at the intended workstation.

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7.2.1 Setup
Level balance with foot screws until the air bubble of the water balance is in the pre-
scribed circle.
Models CXP:
1 Weighing plate 6 Platform
2 Cantilever 7 Display part
3 Screws (x 2) 8 Support
4 Spring 9 Screws (x 4)
5 Substructure 10 Allen keys
A) Insert screw (3) in eye of spring (4) and screw it down.
Screw down second screw (3) as well.
B) Push the holder (8) into the guide rail of the display part (7).
Attach the display part (7) to the weighing balance, using the four screws (9). Use an
Allen key (10) to tighten the screws.

CXB/CXP-BA-e-0711 17
7.2.2 Scope of delivery
Serial accessories:
CXB models CXP models
Balance Platform
Weighing plate Terminal
Mains power supply Mains power supply
Protective cover Protective cover
Internal battery Internal battery
Operating Manual 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.
7.4 Battery power supply
The optionally supplied battery is charged with the supplied power supply.
Before the first use, the battery should be charged by connecting it to the mains
power supply for at least 15 hours. The battery has a service life of c. 200 hours
without background lighting or 60 hours with background lighting. The charging pe-
riod for total charge is c. 8 hours
The appearance of the battery symbol in the weight display indicates that the
battery is almost exhausted. If no weighing process is carried out during the red LED
display, the balance will switch off automatically after about 20-30 minutes. Connect
the power adaptor as soon as possible to change the battery.
The LED display provides information about the battery's charging status.
red: Battery is almost discharged
green: Battery is completely discharged
7.5 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 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.

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7.5.1 Start-up
Turn on scales with ON/OFF switch (left).
The balance will carry out a self-test As soon as the weight display shows "0" in all
the three display windows your balance is ready to weigh.
On CXP models (with RS 232) an internal number appears before the balance counts
down to zero.
0
W
a
PRE-
TARE
0 0
M+
W
7.5.2 Turn off – CXB models
•Turn off balance by operating the ON/OFF switch (left)
7.5.3 Turn off/standby mode – CXP models
•To turn off the balance for a long period of time use the ON/OFF switch
(left).
•To turn off the balance for a short period of time use the key.
To do this, press the key until "OFF" is displayed. Balance is in
standby mode (this avoids the required warm-up time). Restart the balance by
pressing the key.
7.5.4 Balance zero display
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 (± 0,2 % max).
To reset the balance to zero, press key . A triangle [W] pops up next to the [ a ]
symbol on the display.
7.5.5 Stability display
If a triangle [W] pops up next to the [ ] symbol on the display,
the balance is in a stable state. If the status is instable the [W] display disappears.

CXB/CXP-BA-e-0711 19
7.6 Adjustment with external weight
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 chan-
ge 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.
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.
Operation
Ensure that there are no objects on the weighing plate.
0
W
a
PRE-
TARE
Press the key and keep it pressed down whilst simultaneously operating the
key
Weight value of adjustment weight is flashing on display. However, you may enter
a value of your choice via the number keys. *
3000
W
a
PRE-
TARE
CAL
Carefully place adjusting weight in the centre of the weighing plate. Adjustment will
be carried out automatically after dead stop control.
Remove adjustment weight during count down to zero.
The balance returns automatically into weighing mode. An error message will ap-
pear on the display should a adjustment error occur or should the adjustment
weight be incorrect. Turn balance off, then restart it and repeat the adjustment
process.
* The adjustment should be made with the recommended adjustment weight (see
chap. 1 "Technical data"). Weights of different nominal values may be used for ad-
justment but are not optimal for technical measuring.
Info about adjustment weights can be found on the Internet at: http://www.kern-
sohn.com
Note
Use the key to exit adjustment mode. The balance returns to weighing mode.

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8 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.
8.1 Determination of the reference weight by weighing
Set balance to zero and tare, as required.
0
W
a
PRE-
TARE
0 0
M+
Place a known number of parts on the balance as reference weight
118.3
a
PRE-
TARE
0 0
M+
If the "Weight" display is stable, enter the number of parts via number keys.
118.3
a
PRE-
TARE
Weight
100
Pieces
1
M+
While the “number of pieces” display is flashing (3 sec) confirm by pressing the
key.
118.3
a
PRE-
TARE
SAnnP
------
M+
Dead stop control is carried out and the calculated reference weight appears on the
display.
118.3
a
PRE-
TARE
Weight
1.1833
Reference weight
100
M+
W
Pieces
Now you can place the parts to be counted onto the weighing plate.
All quantity parameters of your goods to be weighed are displayed:

CXB/CXP-BA-e-0711 21
8.2 Numeric entering of the reference weight
If you know the reference weight/piece you can enter this via number keys.
Enter reference weight via number keys
0
W
a
PRE-
TARE
1.833
0
M+
W
Confirm with key
0
W
a
PRE-
TARE
1.833
Reference weight
0
M+
W
Now you can place the parts to be counted onto the weighing plate. All quantity pa-
rameters of your goods to be weighed are displayed:
8.3 Automatic reference optimization
If it was impossible to determine a reference due to instable goods to be weighed or
an insufficient reference weight, the [W] display will appear in the reference weight
window during reference calculation.
Overlay Windicates:
Placed number of pieces insufficient for reference calculation
CXB models < 40 d
CXP models < 20 d
Placed reference weight insufficient for reference calculation
CXB models < 4/5 d
CXP models < 1/5 d
Add additional parts until the [W] display disappears.
An audio signal indicates that reference optimization has been carried out.
At every reference optimisation, the reference weight is calculated anew. As the addi-
tional pieces increase the base for the calculation, the reference also becomes more
exact.