KERN GAB-N User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: [email protected]om
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 1.3
01/2011
GB
GAB-N-BA-e-1113

GB KERN GAB-N
Version 1.3 01/2011
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/erection..................................................................................................................... 9
5.2.1 Scope of delivery / serial accessories ........................................................................................ 9
5.3 Mains connection........................................................................................................................ 9
5.4 Rechargeable battery operation ............................................................................................... 10
5.5 Connection of peripheral devices ............................................................................................. 10
5.6 Initial Commissioning................................................................................................................ 10
6Appliance overview ..................................................................................... 11
7Overview of displays ................................................................................... 12
8Keyboard overview ...................................................................................... 13
9Adjustment ................................................................................................... 14
9.1 Verified models......................................................................................................................... 15
9.2 Non-verifiable models:.............................................................................................................. 16
9.3 Verification................................................................................................................................17
10 Operation...................................................................................................... 19
10.1 Weighing................................................................................................................................... 19
10.2 Weighing with tare .................................................................................................................... 19
10.3 Percent weighing ...................................................................................................................... 20
10.4 Parts counting........................................................................................................................... 21
10.5 Weighing with tolerance range ................................................................................................. 22
10.6 Manual totalizing....................................................................................................................... 24
10.7 Automatic adding-up................................................................................................................. 26
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GAB-N-BA-e-1113 3
11 The menu...................................................................................................... 28
11.1 Navigation in the menu:............................................................................................................ 28
11.1.1 Non verifiable models........................................................................................................... 28
11.1.2 Verifiable models.................................................................................................................. 28
11.2 Overview:.................................................................................................................................. 29
11.2.1 Non verifiable models........................................................................................................... 29
11.2.2 Verifiable models.................................................................................................................. 30
12 Service, maintenance, disposal.................................................................. 31
12.1 Cleaning ................................................................................................................................... 31
12.2 Service, maintenance............................................................................................................... 31
12.3 Disposal.................................................................................................................................... 31
12.4 Error messages ........................................................................................................................ 32
13 Instant help................................................................................................... 33

4 GAB-N-BA-e-1113
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: 9 V, 800 mA
Rechargeable battery,
not included
Working life approx. 70 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-1113 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: 9 V, 800 mA
Rechargeable battery,
not included
Working life approx. 70 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

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.
6 GAB-N-BA-e-1113

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.
3.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
GAB-N-BA-e-1113 7

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
ÖKeep all parts of the original packaging for a possibly required
return.
ÖOnly use original packaging for returning.
ÖPrior to dispatch disconnect all cables and remove loose/mobile
parts.
ÖReattach possibly supplied transport securing devices.
ÖSecure 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.
8 GAB-N-BA-e-1113

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.
5.2 Unpacking/erection
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
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.
GAB-N-BA-e-1113 9

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 chpt. 11 menu).
An arrow [S]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.
10 GAB-N-BA-e-1113

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
GAB-N-BA-e-1113 11

7 Overview of displays
00000.0
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
12 GAB-N-BA-e-1113

8 Keyboard overview
Button Designation Function
UNIT
UNIT-key Weighing units switch-over
PRINT Data transfer via interface
Save value to memory if memory function
“automatic“, is disabled
PRINT
ESC
PRINT button
ESC Return to weighing mode
F Changes between weighing mode and
quantity counting mode
F
C
Function-key
C Delete displayed value
% Weight value displayed in %
%
Percentage key
Move to the left by one decimal point
TOL Enter upper, lower or both limits
TOL
Tolerance key
Check-weighing
Move to the right by one decimal point
TARE Tare balance
TARE
Tare key
Increase displayed value
0 Reset scales to zero
0
Zeroing key
Confirm entered value or select function
GAB-N-BA-e-1113 13

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 chpt 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.
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9.1 Verified models
ÖSwitch-on the appliance and during the selftest keep the
adjustment switch pressed and press
TARE
and
%
.
„UnLoAd“ appears. UnLQAD
ÖAcknowledge by . Ensure that there are no objects on
the weighing plate.
ÖThe currently set adjustment weight will be displayed.
ÖTo change by using the navigation buttons (see operating
instructions chap. 8) select the desired setting, the active
digit is flashing.
22.000
ÖAcknowledge by . LQAD
ÖCarefully place adjusting weight in the centre of the
weighing plate. Wait for stability display, then press .
„PASS“ appears
Ø
PASS
ÖAfter 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.
0.0
GROSS
ZERO
GAB-N-BA-e-1113 15

9.2 Non-verifiable models:
ÖSwitch 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.
UnLQAD
Ø
22.000
(Example)
ÖChange by pressing the navigation keys (See manual chpt
8); select desired setting; currently enabled digit will be
flashing.
12.000
(Example)
ÖConfirm value by 0, “Load“ will be displayed. LQAD
ÖPlace adjustment weight, stability display appears
ÖAfter 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.
0.0
GROSS
ZERO
16 GAB-N-BA-e-1113

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".
GAB-N-BA-e-1113 17

Notes on verified Waagen
Possible seals: B urgent, and A or C
A
B
C
1
2
3
4
1
1. Seal of approval
2. Cover
3. Verification switch
4. Verification wire
18 GAB-N-BA-e-1113

10 Operation
10.1 Weighing
9.9.9.9
Ø
0.0
GROSS
ZERO
ÖTurn on the scales by pressing the ON/OFF button
underneath the scales on the right.
The balance will carry out a self-test. The balance is ready for
weighing when the weight display „0.0“ appears.
When required, the scales can be reset to zero at any time
using 0.
10.2 Weighing with tare
123
GROSS
(Example)
Ø
0.0
NET
123.4
-
ZERO
NET
ÖDeposit weighing receptacles
ÖAfter successful stop check press the
TARE
button.
The zero display and the symbol NET will appear.
The weight of the container is now internally saved.
ÖWhen the weighing container is removed, its weight will be
shown as a negative value.
ÖThe taring process can be repeated any number of times,
e.g. when adding several components for a mixture (adding).
The limit is reached when the whole weighing range is
exhausted.
0.0
GROSS
ZERO
ÖTo delete the tare value, remove load from weighing plate
and press
TARE
.
The taring process can be repeated any number of times, e.g. when adding several
components for a mixture (adding). The limit is reached when the whole weighing
range is exhausted.
GAB-N-BA-e-1113 19

10.3 Percent weighing
Percent weighing allows to display weight in percent, in relation to a reference
weight.
0.0
GROSS
ZERO
ÖUnload scales and set to zero
123
GROSS
(Example)
Ø
100.00
GROSS %
ÖPut a reference weight on the weighing plate, which
corresponds to 100%
ÖPress
%
100.00 % will appear on the display
0.00
ZERO
GROSS %
ÖRemove the reference weight
The display will return to 0.00 %
20.00
GROSS %
ÖPlace a sample
The display will show the percentage value of the sample in
relation to the reference value.
ÖTo return to gram / kilo mode, press
F
C
20 GAB-N-BA-e-1113