KERN GAB-N User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: [email protected]
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating instructions
Bench scales
KERN GAB-N
Version 1.5
10/2013
GB
GAB-N-BA-e-1315

2 GAB-N-BA-e-1315
GB
KERN GAB-N
Version 1.5 10/2013
Operating Instructions Bench Scales
Table of Contents
1Technical Data ................................................................................................ 4
2Basic Information (General)........................................................................... 6
2.1 Proper use ................................................................................................................................... 6
2.2 Improper Use............................................................................................................................... 6
2.3 Warranty ...................................................................................................................................... 7
2.4 Monitoring of Test Resources...................................................................................................... 7
3Basic Safety Precautions............................................................................... 7
3.1 Pay attention to the instructions in the Operation Manual........................................................... 7
3.2 Personnel training........................................................................................................................ 7
4Transportation & Storage............................................................................... 8
4.1 Testing upon acceptance ............................................................................................................ 8
4.2 Packaging / return transport ........................................................................................................ 8
5Unpacking, Setup and Commissioning ........................................................ 8
5.1 Installation Site, Location of Use ................................................................................................. 8
5.2 Unpacking/installation................................................................................................................ 10
5.2.1 Scope of delivery / serial accessories ................................................................................... 11
5.3 Mains connection....................................................................................................................... 11
5.4 Rechargeable battery operation (option)................................................................................... 12
5.5 Connection of peripheral devices .............................................................................................. 12
5.6 Initial Commissioning................................................................................................................. 12
6Appliance overview ...................................................................................... 13
7Overview of displays.................................................................................... 14
8Keyboard overview....................................................................................... 15
9Adjustment.................................................................................................... 16
9.1 Verified models.......................................................................................................................... 17
9.2 Non-verifiable models:............................................................................................................... 18
9.3 Verification................................................................................................................................. 19
9.4 Linearization (non-verified models only).................................................................................... 21
10 Operation....................................................................................................... 23
10.1 Weighing.................................................................................................................................... 23
10.2 Weighing with tare ..................................................................................................................... 23
10.3 Percent weighing ....................................................................................................................... 24
10.4 Parts counting............................................................................................................................ 25
10.5 Weighing with tolerance range .................................................................................................. 26
10.5.1 Traffic light function ............................................................................................................... 26
10.6 Manual totalizing........................................................................................................................ 28
10.7 Automatic adding-up.................................................................................................................. 30

GAB-N-BA-e-1315 3
11 The menu....................................................................................................... 32
11.1 Navigation in the menu:............................................................................................................. 32
11.1.1 Non verifiable models ............................................................................................................ 32
11.1.2 Verifiable models ................................................................................................................... 32
11.2 Overview:................................................................................................................................... 33
11.2.1 Non verifiable models ............................................................................................................ 33
11.2.2 Verifiable models ................................................................................................................... 35
12 Data output.................................................................................................... 36
12.1 RS232 interface......................................................................................................................... 36
12.1.1 Technical data ....................................................................................................................... 36
12.1.2 Pin allocation of balance output bushing:.............................................................................. 36
12.1.3 Explanation of the data transfer............................................................................................. 37
12.2 Remote control instructions ....................................................................................................... 37
13 Service, maintenance, disposal................................................................... 38
13.1 Cleaning..................................................................................................................................... 38
13.2 Service, maintenance ................................................................................................................ 38
13.3 Disposal..................................................................................................................................... 38
13.4 Error messages ......................................................................................................................... 39
14 Instant help.................................................................................................... 40
15 Declaration of -Conformity........................................................................... 41

4 GAB-N-BA-e-1315
1 Technical Data
KERN
GAB 6K1DNM
GAB 15K2DNM
GAB 30K5DNM
Readability (d)
1 g /2 g
2 g /5 g
5 g /10 g
Weighing range (max)
3 kg /6 kg
6 kg /15 kg
15 kg /30 kg
Reproducibility
1 g /2 g
2 g /5 g
5 g /10 g
Linearity
± 1 g / 2 g
± 4 g / 10 g
± 5 g / 10 g
Stabilization time
2 s
2 s
2 s
Verification value (e)
1 g /2 g
2 g /5 g
5 g /10 g
Verification class
III
III
III
Minimum weight (min)
20 g
40 g
100 g
Weighing Units
kg
kg
kg
Recommended adjusting
weight (not supplied)
6 kg (M1)
15 kg (F2)
30 kg (M1)
Warm-up time
10 min.
10 min.
10 min.
Minimum unit weight at
piece count
0.2 g
0.5 g
1 g
Admissible ambient
conditions
-10° C to +40° C
Humidity of air
max. 80 % relative (not condensing)
Weighing surface (mm)
294 x 225
Dimensions of the housing
(B x D x H) (mm)
320 x 330 x 125
Electric Supply
Supply voltage: 220V-240V AC 50 Hz
Mains adapter: 12 V, 500 mA
Rechargeable battery,
not included
Working life approx. 40 h (with background light)
Working life approx. 90 h (without background light)
Loading time approx. 12 hrs.
Net weight (kg)
4.4 kg
interface
RS 232C

GAB-N-BA-e-1315 5
KERN
GAB 6K0.05N
GAB 12K0.1N
GAB 30K0.2N
Readability (d)
0.05 g
0.1 g
0.2 g
Weighing range (max)
6 kg
12 kg
30 kg
Reproducibility
0.05 g
0.1 g
0.2 g
Linearity
± 0.15 g
± 0.3 g
± 0.6 g
Stabilization time
2 s
2 s
2 s
Weighing Units
kg, g
kg, g
kg, g
Recommended adjusting
weight (not supplied)
6 kg (F2)
12 kg (F2)
20 kg (F1)
10 kg (F1)
Warm-up time
2 h
2 h
2 h
Minimum unit weight at
piece count
0.05 g
0.1 g
0.2 g
Admissible ambient
conditions
0° C to 40° C
Humidity of air
max. 80 % relative (not condensing)
Weighing surface (mm)
294 x 225
Dimensions of the housing
(B x D x H) (mm)
320 x 330 x 125
Electric Supply
Supply voltage: 220V-240V AC 50 Hz
Mains adapter: 12 V, 500 mA
Rechargeable battery,
not included
Working life approx. 40 h (with background light)
Working life approx. 90 h (without background light)
Loading time approx. 12 hrs.
Net weight (kg)
3.06 kg
interface
RS 232C

6 GAB-N-BA-e-1315
Dimensions:
2 Basic Information (General)
2.1 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.
2.2 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.

GAB-N-BA-e-1315 7
2.3 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
2.4 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.
3 Basic Safety Precautions
3.1 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.
3.2 Personnel training
The appliance may only be operated and maintained by trained personnel.

8 GAB-N-BA-e-1315
4 Transportation & Storage
4.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
4.2 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.
Reattach transport securing devices. (see chapter 5.2)
Secure all parts such as the glass wind screen, the weighing
platform, power unit etc. against shifting and damage.
5 Unpacking, Setup and Commissioning
5.1 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.

GAB-N-BA-e-1315 9
Therefore, observe the following for the installation site:
Place scales on a stable, even 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 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.

10 GAB-N-BA-e-1315
5.2 Unpacking/installation
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
Ensure that transport guard has been removed
(only existing in 6 kg models)
To loosen the transport guard screw out transport screw [1] anticlockwise.
For transportation screw down the transport screw till to the stop in clockwise
direction.
1

GAB-N-BA-e-1315 11
Levelling
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
5.2.1 Scope of delivery / serial accessories
Balance
Mains power supply
Operating instructions
5.3 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.

12 GAB-N-BA-e-1315
5.4 Rechargeable battery operation (option)
The internal battery is charged with the supplied mains cable.
Before the first use, the rechargeable battery should be charged by connecting it to
the mains power cable for at least 15 hours. The operating time of the battery is
about. 70h. Charging time until complete recharging ca. 12h.
To save battery life, the background light can be switched off in the menu
(See chap.. 11 menu).
An arrow appearing on the weight display below the battery icon indicates
that the capacity of the rechargeable battery is low. The balance will be ready to
operate for about another 10 hrs., then it will switch off automatically. Connect the
power cable as soon as possible to load the rechargeable battery.
5.5 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.
5.6 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.

GAB-N-BA-e-1315 13
6 Appliance overview
1
2
3
4
5
6
1. Weighing plate / rechargeable battery compartment (under
weighing plate)
2. Bubble level
3. RS 232 interface
4. Footscrews
5. ON/OFF switch
6. Mains adapter connection

14 GAB-N-BA-e-1315
7 Overview of displays
ZERO
NET
GROSS
LO
OK
HI
21
6
54 3
Display
Designation
Description
1
The battery capacity
display
Appears when the capacity of the battery is
getting low
2
Stability display
Scales are in a steady state
3
ZERO
Zeroing display
Should the balance not display exactly zero
despite empty scale pan, press the
0
button. The balance will be set to zero after a
short standby time.
4
NET
Net weight display
Displays the net weight
5
GROSS
Gross weight display
Showing gross weight
6
LO
OK
HI
Tolerance check
Checkweighing
Load above (HI), below (LO) or within (OK)
tolerance range
Power supply connected
Icon is glowing for power supply via power
pack

GAB-N-BA-e-1315 15
8 Keyboard overview
Button
Designation
Function
UNIT
UNIT-key
Weighing units switch-over
PRINT
ESC
PRINT button
PRINT
Data transfer via interface
Save value to memory if memory function
“automatic“, is disabled
ESC
Return to weighing mode
F
C
Function key
F
Changes between weighing mode and
quantity counting mode
C
Delete displayed value
%
Percentage key
%
Weight value displayed in %
Move to the left by one decimal point
TOL
Tolerance key
Check-weighing
TOL
Enter upper, lower or both limits
Move to the right by one decimal point
TARE
Tare key
TARE
Tare balance
Increase displayed value
0
Zeroing key
0
Reset scales to zero
Confirm entered value or select function

16 GAB-N-BA-e-1315
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.
For verified balances the adjustment is locked. In order to access the
menu you will have to short-circuit the two contacts of the circuit board
with a jumper (See chap. 9.3).
Attention:
After destruction of the seal the balance must be re-verified by an
authorised agency and a new verification wire/seal mark fitted before it
can be reused for applications subject to verification.
Observe the verification notes (see chapter 9.3).
The weight to be used depends on the capacity of the balance. Carry
out adjustment as near as possible to the balance’s maximum weight.
Info about test weights can be found on the Internet at: http://www.kern-
sohn.com
Observe stable environmental conditions.
Stabilisation requires a certain warm-up time.

GAB-N-BA-e-1315 17
9.1 Verified models
Switch on device via ON-OFF and press the adjustment
switch at the same time.
After that, during the balance’s selftest, press
TARE
and
%
at the same time. „UnLoAd“ appears.
Acknowledge by . Ensure that there are no objects on
the weighing plate.
The currently set adjustment weight will be displayed.
To change by using the navigation buttons (see operating
instructions chap. 8) select the desired setting, the active
digit is flashing.
Acknowledge by . „LoAd“ is displayed.
Carefully place adjusting weight in the centre of the
weighing plate. Wait for stability display, then press .
„PASS“ appears

After the adjustment the balance will carry out a self-test.
Remove adjusting weight during selftest, the appliance will
return into weighing mode automatically.
An adjusting error or incorrect adjusting weight will be
indicated by the error message; repeat adjustment
procedure.
GROSS
ZERO

18 GAB-N-BA-e-1315
9.2 Non-verifiable models:
Switch on balance Whilst balance is carrying out self-test
(counts down from 99… to 00…)
TARE
and
%
press at the
same time.
“UnLoad“ will be displayed, followed by flashing numeric
value.

(Example)
Change by pressing the navigation keys (See manual chap.
8); select desired setting; currently enabled digit will be
flashing.
(Example)
Confirm value by
0
, “Load“ will be displayed.
Place adjustment weight, stability display appears
After the adjustment the balance will carry out a self-test.
Remove adjusting weight during self test,
balance will return into weighing mode automatically.
In case of an adjustment error or incorrect adjusting weight
the display will show an error message, repeat adjustment
process.
GROSS
ZERO

GAB-N-BA-e-1315 19
9.3 Verification
General introduction:
According to EU directive 90/384/EEC balances must be verified if they are used as
follows (legally controlled area):
a) For commercial transactions if the price of goods is determined by weighing.
b) For the production of medicines in pharmacies as well as for analyses in the
medical and pharmaceutical laboratory.
c) For official purposes.
d) For manufacturing final packages.
In cases of doubt, please contact your local trade in standard.
Verification notes:
An EU Qualification Approval is in existence for verified weighing systems. If a
balance is used where obligation to verify exists as described above, it must verified
and re-verified in regular intervals.
Reverification is carried out according to relevant national statutory regulations. The
validity for verification of balances in Germany is e.g. 2 years.
The legal regulation of the country where the balance is used must be observed!
Verification of the weighing system is invalid without the "seal".

20 GAB-N-BA-e-1315
Notes on verified balances
Possible seals: B urgent, and A or C
A
BC
1
2
3
4
1
1. Seal of approval
2. Cover
3. Verification switch
4. Verification wire