KERN ADJ Series 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
Servicemanual
Analytical balance
KERN ADJ
Version 1.0
09/2019
GB
ADJ-SA-e-1910
Importør:
Impex Produkter AS
Gamle Drammensvei 107
1363 Høvik
www.impex.no
[email protected]
Tel.: [phone]

2 ADJ-SH-e-1910
GB
KERN ADJ
Version 1.0 07/2019
Servicemanual
Contents
1Basic Information........................................................................................4
2Introdution...................................................................................................4
3Device overview ..........................................................................................5
3.1 Components......................................................................................................................5
3.2 Keyboard overview...........................................................................................................6
3.3 Overview of display..........................................................................................................8
4Basic Information (General).......................................................................9
4.1 Intended use......................................................................................................................9
4.2 Improper Use.....................................................................................................................9
4.3 Warranty ............................................................................................................................9
4.4 Monitoring of Test Resources.......................................................................................10
5Basic Safety Precautions .........................................................................10
5.1 Pay attention to the instructions in the Operation Manual ........................................10
5.2 Personnel training ..........................................................................................................10
6Transport and storage..............................................................................10
6.1 Testing upon acceptance...............................................................................................10
6.2 Packaging / return transport..........................................................................................10
7Unpacking, Setup and Commissioning...................................................12
7.1 Installation Site, Location of Use ..................................................................................12
7.2 Unpacking, checking and installation ..........................................................................13
7.3 Levelling ..........................................................................................................................14
7.4 Electric power supply.....................................................................................................14
7.4.1 Initial Commissioning............................................................................................15
7.5 Connection of peripheral devices.................................................................................15
8Menu...........................................................................................................16
8.1 Navigation in the menu ..................................................................................................16
8.2 Menu overview ................................................................................................................18
9Adjustment ................................................................................................20
9.1 ADJ Models .....................................................................................................................20
9.1.1 Automatic adjustment using a built-in weight .....................................................20
9.2 Procedure:.......................................................................................................................21
9.3 Manual initiation of internal adjustment.......................................................................22
10 Linearity calibration...............................................................................23
10.1 Check count value..........................................................................................................23

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10.2 Procedure linear calibration ..........................................................................................25
10.3 External weight calibration............................................................................................28
10.3.1 Factory External Weight Calibration.....................................................................28
Before calibration, please make sure you have preheated the balance for 30 minutes and
adjusted the level. ................................................................................................................28
10.3.2 User ExternalWeightCalibration(user modeC3------0)...........................................30
11 Adjust theCornerError...........................................................................31
11.1 Corner Error Inspection .................................................................................................31
12 Adjustment of zero count and full capability count value..................36
12.1 Adjustment of zero count value：.................................................................................36
12.2 Adjustment of Full capability count value：................................................................36
13 Adjust Internal calibration weight value ..............................................36
14 Restoresystemsetting ...........................................................................37
15 Servicing and Maintenance...................................................................40

4 ADJ-SH-e-1910
1 Basic Information
The device must be repaired only by trained specialist staff or personnel with professional
formation (such as a repair-specialist accredited by law concerning verification). The service
manual is obligatory for repair work. After repair, original conditions of the device have to be
restored. Only original spare parts should be used.
Instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval. A violation of this
specification will result in a loss of the type approval! After successful repair the balance will
have to be reverified before it can be used again in a statutorily regulated field.
Detailed instructions about conformity-evaluated scales:
Repair must be carried only at 100% compliance with the type approval. A violation of this
specification will result in a loss of the type approval!
After successful repair the balance will have to be reverified before it can be used again in a
statutorily regulated field.
2 Introdution
This service manual covers the ADJ series and is edited for the authorized servicing personnel.
Note all rights are reserved. Copying any part of this manual is prohibited without our
permission.
.

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3 Device overview
3.1 Components

6 ADJ-SH-e-1910
3.2 Keyboard overview
Key
Designation
Function
ON/OFFkey
Turn on/off
Exit menu
CALkey
Adjustment
TAREkey
Taring
Zeroing
Save setting
Pos.
Designation
1
Glass windshield
2
Interface RS 232
3
Weighing pan
4
Bubble level
5
Display
6
Keyboard
7
Foot screws
8
Handle for operation of the side windshield doors
9
Mains adapter connection

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MODEkey
Switch-over weighing unit
Selecting an application
MENUkey
How to save the reference
Switch on/off background illumination of display
(keep the button pressed for a long time)
PRINTkey
Change setting in the menu
Print out the displayed value

8 ADJ-SH-e-1910
3.3 Overview of display
Display
Description
Stabilitydisplay
The balance is in stand-by mode
g
Weighing unit “Gram”
ct
Weighing unit „Carat“
lb
Weighing unit „Pound“
oz
Weighing unit „Ounce“
Pcs
Application parts counting
%
Application percentage determination

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4 Basic Information (General)
4.1 Intended use
The balance you purchased is intended to determine the weighing value of material to be
weighed. It is intended to be used as a “non-automatic balance”, i.e. the material to be
weighed is manually and carefully placed in the centre of the weighing pan.As soon as a
stable weighing value is reached the weighing value can be read.
4.2 Improper Use
Do not use balance for dynamic add-on weighing procedures, if small amounts of goods
to be weighed are removed or added. The “stability compensation“ installed in the
balance may result in displaying an incorrect measuring value!(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 damaged
by this.
Never operate balance in explosive environment. The serial version is not explosion
protected.
The structure of the balance may not be modified. This may lead to incorrect weighing
results, safety-related faults and destruction of the balance.
The balance may only be used according to the described conditions. Other areas of use
must be released by KERN in writing.
4.3 Warranty
Warranty claims shall be voided in case
Our conditions in the operation manual are ignored
The appliance is used outside the described uses
The appliance is modified or opened
Mechanical damage 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 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 substancesand 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 appliance
itself when unpacking for possible visible damage.
6.2 Packaging / return transport
Keep all parts of the original packaging for a possibly required
return.
Only use original packaging for returning.
Prior to dispatch disconnect all cables and remove loose/mobile
parts.
Pack weighing plate + accessories and power supply unit
separately.
Secure glass windshield against slipping (e.g. using an adhesive
strip).

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Secure all parts against shifting and damage as depicted.

12 ADJ-SH-e-1910
,
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.
On the installation site observe the following:
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.
If electro-magnetic fields or static charge occur, or if the power supply is unstable major
deviations on the display (incorrect weighing results) are possible. In that case, the
location must be changed.

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7.2 Unpacking, checking and installation
Open packaging and remove all parts carefully.
Verify that there has been no damage and that all packing items are present.
Scope of delivery / serial accessories
Balance
Mains adapter
Operating instructions
Prior to any installation and assembly works, the balance must
be separated from the mains supply.
Install the balance at the intended workplace.
The right place is decisive for the accuracy of the weighing results of high-
resolution analytic balances (see chap. 7.1).
Remove the transportation lock (only models ADJ)
Put the following parts upon in the right order
Carrier of weighing plate
Weighing pan

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7.3 Levelling
Level balance with foot screws until the air bubble of the water balance is in the
prescribed circle.
Check levelling regularly.
7.4 Electric power supply
Select a country-specific mains plug.
Check, whether the voltage acceptance on the scales is set correctly. Do not
connect the scales to the power grid unless the information on the instrument
(sticker) matches the local mains voltage.
Only use KERN original mains adapter. Using other makes requires consent by
KERN.
Important:
Prior to commissioning check the mains cable for damage.
Make sure that the mains adapter will not be in touch with liquids.
The mains plug must be accessible at any time.
Connect the mains adapter to the connecting socket on the backside of the
balance and to the power mains.
The display unit lights up. As soon as the balance is supplied with energy, the
indicator [ ] is displayed.

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The error message <P FAIL> indicates that the balance was disconnected
from power supply without pressing the ON/OFF button.
Remedy:
Press ON/OFF. The device will carry out a display test.
The balance is ready for weighing once the weight indication appears.
7.4.1 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.
7.5 Connection of peripheral devices
Before connecting or disconnecting of additional devices (printer, PC) to the data
interface, always disconnect the balance from the power supply.
With your balance, only use accessories and peripheral devices by KERN, as they are
ideally tuned to your balance.

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8 Menu
8.1 Navigation in the menu
1.
Access to menu
In weighing mode print first the MENU key, then the
PRINT key. The first menu item „C1“ showing the
current setting will be displayed.
2.
Select menu items
Press the TARE key to select the individual menu
items showing the current settings one by one.
3.
Change settings
Press the PRINT key to change the setting of a
selected menu item. Each time the PRINT key is
pressed the next setting will be displayed.

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Confirm setting with TARE key, the next menu item
will be displayed.
Either carry out more settings or exit and save
menu (see step 4 or 5)
4.
How to save settings and to exit the menu
Press the ON/OFF key, „SAVE“ will be displayed.
Any changes carried out are stored by pressing the
TARE key.The balance returns automatically into
weighing mode.

5.
Cancel
Press again the ON/OFF key, no changes will be
saved. The balance returns automatically into
weighing mode.


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8.2 Menu overview
Menu item
Settings
Description
Adjustment mode
C1 - 0
Automatic internal adjustment (ADJ models)
C1 –1*
External adjustment (ADB models:
always use this setting)
C1 - 2
Manual internal adjustment (ADJ models)
Reference quantity
C2 –0*
10
C2 - 1
20
C2 - 2
50
C2 - 3
100
C2 - 4
1000
Automatic
zero point correction
C3 - 0
No Zerot Tracking
C3 –1
1D Zero-point Tracking
C3 - 2
2D Zero-point Tracking
C3 –3*
3D Zero-point Tracking
C3 - 4
4D Zero-point Tracking
C3 - 5
5D Zero-point Tracking
C3 - 6
Not documented
Baud rate
C4 - 0
1200
C4 - 1
2400
C4 - 2
4800
C4 –3*
9600
Data output
C5 - 0
Automatic output of stable weighing values
C5 - 1
Via remote control command W (w)
C5 - 2
Continuous data output
C5 –3*
Output for stable and instable weighing values after
pressing PRINT key
Sound by pressing
the button
C6 –0*
switched on
C6 - 1
switched off
C7 - 0*
2 hours
C7 - 1
3 hours

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Automatic internal
adjustment interval (only ADJ
models)
C7 - 2
4 hours
C7 - 3
6 hours
C7 - 4
8 hours
Filter
C8 - 0
Low interference degree
C8 –1*
Medium interference degree
C8 - 2
High interference degree
C8 - 3
Not documented
* = factory setting

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9 Adjustment
As the acceleration value due to gravity is not the same at every location on earth, each
balance must be coordinated - in compliance with the underlying physical weighing
principle - to the existing acceleration due to gravity at its place of location (only if the
balance has not already been adjusted to the location in the factory).
This adjustment process must be carried out for the first commissioning, after each
change of location as well as in case of fluctuating environment temperature.
To receive accurate measuring values it is also recommended to adjust the balance
periodically in weighing operation.
Observe stable environmental conditions. A warming up time (see chapter 1) is required
for stabilization. Ensure that there are no objects on the weighing pan.
9.1 ADJ Models
9.1.1 Automatic adjustment using a built-in weight
Ensure menu setting <C1-0> see chapter Fehler! Verweisquelle konnte nicht
gefunden werden..
Automatic adjustment is performed:
having detected a change in temperature by 2°C from the previous adjustment,
a defined time interval has elapsed, selectable 2, 3, 4, 6, 8 hours
(C7-0 –C7-4, see chapter Fehler! Verweisquelle konnte nicht gefunden werden.).