KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Counting balances
KERN CXB
Version 2.2
04/2016
GB
CXB-BA-e-1622
2 CXB-BA-e-1622
GB
KERN CXB
Version 2.2 04/2016
Operating manual
Counting balances
Contents
1 Technical data ................................................................................................ 4
2 Appliance overview ....................................................................................... 6
2.1 Overview of display .................................................................................................................. 7
2.1.1 Display weight ............................................................................................................................. 8
2.1.2 Display reference weight ............................................................................................................ 8
2.1.3 Display quantity ........................................................................................................................... 8
2.1.4 Battery charge status display ...................................................................................................... 8
2.2 Keyboard overview ................................................................................................................... 9
3 Basic Information (General) ........................................................................ 11
3.1 Proper use ............................................................................................................................... 11
3.2 Improper Use........................................................................................................................... 11
3.3 Warranty .................................................................................................................................. 11
3.4 Monitoring of Test Resources ............................................................................................... 12
4 Basic Safety Precautions ............................................................................ 12
4.1 Pay attention to the instructions in the Operation Manual ................................................ 12
4.2 Personnel training .................................................................................................................. 12
5 Transport and storage ................................................................................. 12
5.1 Testing upon acceptance ...................................................................................................... 12
5.2 Packaging ................................................................................................................................ 12
6 Unpacking, Setup and Commissioning ..................................................... 13
6.1 Installation Site, Location of Use .......................................................................................... 13
6.2 Unpacking ............................................................................................................................... 13
6.2.1 Placing ...................................................................................................................................... 14
6.2.2 Scope of delivery ...................................................................................................................... 14
6.3 Mains connection ................................................................................................................... 14
6.4 Rechargeable battery operation ............................................................................................ 14
6.5 Initial Commissioning ............................................................................................................ 14
6.5.1 Start-up ..................................................................................................................................... 15
6.5.2 Switching Off............................................................................................................................. 15
6.5.3 Balance zero display ................................................................................................................. 15
6.5.4 Stability display ......................................................................................................................... 15
6.6 Linearisation (verified m o dels only) ..................................................................................... 16
6.7 Adjustment with external weight .......................................................................................... 19
6.7.1 Adjustment models CXB........................................................................................................... 20
6.7.2 Adjustment models CXB_M...................................................................................................... 22
7 Verification ................................................................................................... 24
7.1 Adjustment switch and seal .................................................................................................. 25
CXB-BA-e-1622 3
8 Parts counting .............................................................................................. 26
8.1 Determination of the reference weight by weighing ........................................................... 26
8.2 Numeric entering of the reference weight ........................................................................... 27
8.3 Automatic re ference optimization ......................................................................................... 27
8.4 Save/call up reference weight – Pre-Set function ............................................................... 28
8.4.1 Save .......................................................................................................................................... 28
8.4.2 Call-up ...................................................................................................................................... 29
8.5 Count with tolerance control - Fill to target ......................................................................... 30
8.5.1 Set tolerance value for target number of pieces ....................................................................... 30
8.5.2 Set tolerance value for target weight ........................................................................................ 31
9 Taring ............................................................................................................ 32
9.1 Determination of the tare weight by weighing ..................................................................... 32
9.2 Numerical input of tare (PRE-TARE) ..................................................................................... 33
10 Totalization ................................................................................................... 36
10.1 Add up “Number of parts" ..................................................................................................... 36
10.2 Add up “Weight" ..................................................................................................................... 37
10.3 Delete stored values ............................................................................................................... 38
11 Menu models CXB ....................................................................................... 39
11.1 Navigation in the menu .......................................................................................................... 39
11.2 Overview main menu.............................................................................................................. 39
11.3 Menu overview function menu „01 FnC“ – Models CXB .................................................... 40
12 Menu models CXB-M ................................................................................... 42
13 Operation ...................................................................................................... 43
13.1 Background illumination of the display - FnC 01 ................................................................ 43
13.2 Automatic switch-off function - FnC 02 ............................................................................... 45
13.3 Setting for calculation of reference value - FnC 03 ............................................................. 46
13.4 Automatic re ference optimisation - FnC 04 ......................................................................... 47
13.5 Pre-Tare setting - FnC 09 ....................................................................................................... 48
13.6 Audio signal during tolerance weighing - FnC 10 ............................................................... 49
14 Servicing, maintenance, disposal .............................................................. 50
14.1 Cleaning................................................................................................................................... 50
14.2 Servicing, maintenance ......................................................................................................... 50
14.3 Disposal ................................................................................................................................... 50
15 Instant help ................................................................................................... 51
16 Declaration of Conformity ........................................................................... 52
4 CXB-BA-e-1622
1 Technical data
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
Heating time (operating
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 adaptor 230 V, 50/60 Hz ; 9 V DC balance, 800 mA
Rechargeable battery Without display backlighting:
Service life c. 200 hours / loading time ca. 8 hrs.
With display backlighting:
Operating time ca. 60h. / loading time ca. 8 hrs.
CXB-BA-e-1622 5
KERN
CXB
3K1NM
CXB
6K2NM
CXB
15K5NM
CXB
30K10NM
Readability (d) 1 g 2 g 5 g 10 g
Weighing range (max) 3 kg 6 kg 15 kg 30 kg
Minimum weight (min) 20 g 40 g 100 g 200 g
Verification value (e) 1 g 2 g 5 g 10 g
Reproducibility 1 g 2 g 5 g 10 g
Linearity 2 g 4 g 10 g 20 g
Verification class III III III III
Stabilization time 2 sec. 2 sec. 2 sec. 2 sec.
Recommended adjustment
weight, not added (class)
3 kg (M1) 6 kg (M1) 15 kg (M1) 30 kg (M1)
Weighing unit kg kg kg kg
Minimum piece weight 100 mg 200 mg 500 mg 1 g
Heating time (operating
temperature)
10 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)
300x330x110 mm
Mains connection Net adapter 220-240 V, 50 Hz;
Rechargeable battery Without display backlighting:
Service life c. 200 hours / loading time ca. 8 hrs.
With display backlighting:
Operating time ca. 60h. / loading time ca. 8 hrs.
6 CXB-BA-e-1622
2 Appliance overview
1. Bubble level
2. Battery compartment
3. Connection for mains cable
4. ON/OFF switch
1
3
4
2
CXB-BA-e-1622 7
2.1 Overview of display
Weight
Reference weight
Loading status display
Quantity
8 CXB-BA-e-1622
2.1.1 Display weight
Here, the weight of your goods is displayed.
Overlay indicates:
a Zeroing display
PRE-
TARE
Tare in memory
Battery very low
2.1.2 Display reference weight
The reference weight of a sample is shown here. This value is either entered by user
of calculated by balance.
Overlay indicates:
Placed number of pieces insufficient for reference calculation
Placed reference weight insufficient for reference calculation
2.1.3 Display quantity
Here, all the parts placed on balance are immediately displayed by number.
Overlay indicates:
M+
Data in summation memory
Stability display
2.1.4 Battery charge status display
red
Battery is almost discharged
green
Rechargeable battery completely
reloaded
CXB-BA-e-1622 9
2.2 Keyboard overview
10 CXB-BA-e-1622
Selection Function
-
• Number keys
• Deleting key
• Move decimal point to the left
• Call counting with tolerance control
• Pre-Set function
• Store reference weights in memory
• Call stored reference weights
• Addition in sum memory
• Call up total memory
• Delete summation memory
• In menu confirm input
• 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
• Taring key
• Enter numerical tare
• Move decimal point to the right and change to the next
menu item
• Decimal point
• Exit menu
CXB-BA-e-1622 11
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
pan. 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” (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. T he 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 or damage by media, liquids, natural wear and tear
• The appliance is improperly set up or incorrectly electrically connected
• The measuring system is overloaded
12 CXB-BA-e-1622
3.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related properties of the
balance and, if applicable, the testing weight, must be checked regularly. The
responsible user must define a suitable interval as well as type and scope of this
test. Information is available on KERN’s home page (www.kern-sohn.com with
regard to the monitoring of balance test substances and the test weights required for
this. In KERN's accredited DKD calibration laboratory test weights and balances may
be calibrated (return to the national standard) fast and at moderate cost.
4 Basic Safety Precautions
4.1 Pay attention to the instructions in the Operation Manual
Carefully read this operation manual before setup and commissioning, even if you
are already familiar with KERN balances.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 Transport and stora ge
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
5.2 Packaging
Keep all parts of the original packaging in case you need to return the appliance.
Only use original packaging for returning.
Before sending, disconnect all connected cables and loose/movable parts.
Attach possibly existing transport safeguards. Secure all parts, e.g. weighing plate,
power unit etc., to prevent slipping and damage.
CXB-BA-e-1622 13
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, 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.
6.2 Unpacking
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
14 CXB-BA-e-1622
6.2.1 Placing
Level balance with foot screws until the air bubble of the water balance is in the
prescribed circle.
6.2.2 Scope of delivery
Serial accessories:
• Balance
• Weighing pan
• Mains adapter
• Protective cover
• Internal battery
• Operating manual
6.3 Mains connection
Power is supplied via the external mains adapter. The stated voltage value must be
the same as the local voltage.
Only use original KERN mains adapters. Using other makes requires consent by
KERN.
6.4 Rechargeable battery operation
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 illumination or 60 hours with background illumination. The
charging period 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: Rechargeable battery completely reloaded
6.5 Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have
reached the operating temperature (see warming up time chap. 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.
CXB-BA-e-1622 15
6.5.1 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�
a
PRETARE
0�
0��
M+
6.5.2 Switching Off
• Turn off balance by operating the ON/OFF switch (left)
6.5.3 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 button . A triangle [ ] pops up next to the [ a ]
symbol on the display.
6.5.4 Stability display
If a triangle [ ] pops up next to the [ ] symbol on the display,
the balance is in a stable state. If the status is instable the [ ] display disappears.
16 CXB-BA-e-1622
6.6 Linearisation (verified models only)
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
Model
Load 0
Load 1
Load 2
Load 3
Load 4
Load 5
CXB 3K1NM
0
600 g
1.2 kg
1.8 kg
2.4 kg
3 kg
CXB 6K2NM
0
1.2 kg
2.4 kg
3.6 kg
4.8 kg
6 kg
CXB 15K5NM
0
3 kg
6 kg
9 kg
12 kg
15 kg
In verified models CXB-M, access to the adjustment is blocked.
To cancel the access lock, the adjustment switch at the lower side of the
balance must be switched from “
LOCK
” position to “
ADJ
” position.
Adjustment switch
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