KERN FOB-N series User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Compact balance
KERN FOB-N
Version 1.0
09/2014
GB
FOB-N-BA-e-1410
FOB-NS
FOB-NL

GB
KERN FOB-N
Version 1.0 09/2014
Operating manual
Compact balance
Contents
1Technical data................................................................................................ 4
2Basic Information (General).......................................................................... 6
2.1 Proper use.................................................................................................................................. 6
2.2 Improper Use.............................................................................................................................. 6
2.3 Warranty..................................................................................................................................... 6
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
4Transport and storage................................................................................... 7
4.1 Testing upon acceptance ........................................................................................................... 7
4.2Packaging / return transport....................................................................................................... 7
5Unpacking, Setup and Commissioning ....................................................... 8
5.1 Installation Site, Location of Use................................................................................................ 8
5.2 Unpacking................................................................................................................................... 8
5.2.1 Placing........................................................................................................................................ 9
5.2.2 Scope of delivery........................................................................................................................ 9
5.3 Mains connection (optional)........................................................................................................ 9
5.4 Battery operation........................................................................................................................ 9
5.5 Initial Commissioning................................................................................................................ 10
5.6Adjustment................................................................................................................................ 10
5.7 Adjustment................................................................................................................................ 10
6Operating elements ..................................................................................... 13
6.1 Keyboard overview................................................................................................................... 13
6.1.1 Models FOB-NS: ...................................................................................................................... 13
6.1.2 Models FOB-NL:....................................................................................................................... 14
6.2 Overview of display .................................................................................................................. 15
6.2.1 Models FOB-NS: ...................................................................................................................... 15
6.2.2 Models FOB-NL:....................................................................................................................... 15
7Operation...................................................................................................... 16
7.1 Simple weighing ....................................................................................................................... 16
7.2 Taring........................................................................................................................................ 17
7.3 Weighing units switch-over....................................................................................................... 17
7.4 Hold function (only "L" models) ................................................................................................ 18
7.5 Backlight of the display (only "L" models) ................................................................................ 19
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8The menu...................................................................................................... 20
8.1 Call up menu ............................................................................................................................ 20
8.2 Navigation in the menu............................................................................................................. 20
8.3Menu overview ......................................................................................................................... 21
8.3.1 Models FOB-NS: ...................................................................................................................... 21
8.3.2 Models FOB-NL:....................................................................................................................... 21
8.4 Menu settings ........................................................................................................................... 22
8.4.1 Setting weighing units............................................................................................................... 22
8.4.2 Automatic switch-off function „AUTO OFF“ in stand-by mode ................................................. 24
9Error messages............................................................................................ 26
10 Servicing, maintenance, disposal .............................................................. 26
10.1 Cleaning.................................................................................................................................... 26
10.2 Servicing, maintenance............................................................................................................ 26
10.3 Disposal.................................................................................................................................... 26
11 Instant help................................................................................................... 27
FOB-N-BA-e-1410 3

1 Technical data
Models „FOB-NS“:
KERN FOB 0.5K-4NS FOB 5K-3NS
Readability (d) 0.1 g 1 g
Weighing range (max) 500 g 5000 g
Reproducibility 0.1g 1 g
Linearity ± 0.2 g ± 2 g
Weighing Units g, lb, oz, ozt, dwt
Recommended adjustment
weight, not added (class) 500 g (M1) 5000 g (M1)
Warm-up time 10 min
Stabilization time (typical) 2 sec.
Operating temperature + 10° C .... + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing (B x D x H) mm 170 x 150 x 40
Weighing plate, stainless steel
(mm) 120 x 150 x 10
Weight kg (net) 650 g
Auto off Options: 2, 3, 4, 5, min; off
Battery 9 V block
Secondary voltage powerpack 9 V / 100 mA
IP protection IP65
4 FOB-N-BA-e-1410

Models „FOB-NL“:
KERN FOB 7K-4NL FOB 10K-3NL FOB 30K-3NL
Readability (d) 0.5 g / 1 g 1 g / 2 g 2 g / 5 g
Weighing range (max) 5 kg / 7.5 kg 8 kg / 15 kg 16 kg / 30 kg
Reproducibility 0.5 g / 1 g 1 g / 2 g 2 g / 5 g
Linearity ± 1.5 g / 3 g ± 3 g / 6 g ± 6 g / 15 g
Weighing Units g, lb, oz, ozt, dwt
Recommended adjustment
weight, not added (class) 5 kg (M1) 10 kg (M1) 30 kg (M1)
Warm-up time 30 min 30 min 30 min
Stabilization time (typical) 2 sec.
Operating temperature + 5° C …. + 35° C
Humidity of air 25% - 95% (non-condensing)
Housing (B x D x H) mm 285 x 255 x 90
Weighing plate, stainless steel
(mm) 252 x 200 x 14
Weight kg (net) 3611 g
Auto off 2 min
Battery 4 x 1,5 V AA
Secondary voltage powerpack 9 V / 100 mA
IP protection IP67
FOB-N-BA-e-1410 5

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“. (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.
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 and damage caused by media, liquids,
natural wear and tear
•The appliance is improperly set up or incorrectly electrically connected
•The measuring system is overloaded
6 FOB-N-BA-e-1410

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.
All language versions contain a non-binding translation.
The original German is binding.
3.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
4 Transport and 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 possibly supplied transport securing devices.
Secure all parts such as the glass wind screen, the weighing plate,
power unit etc. against shifting and damage.
FOB-N-BA-e-1410 7

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.
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.
5.2 Unpacking
Carefully remove the weighing balance from the packaging and install it at the
designated work place.
8 FOB-N-BA-e-1410

5.2.1 Placing
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.
5.2.2 Scope of delivery
Serial accessories:
•Balance
•Weighing plate
•Mains adapter (optional)
•Protective cover
•Operating manual
5.3 Mains connection (optional)
The balance may be operated via the optional 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.
5.4 Battery operation
Unscrew battery cover on the bottom of the housing (see figure 1).
•9 V block battery (FOB-NS) or
•4 x 1.5V AA batteries (FOB-NL)
Put battery cover back in place and tighten it.
Fig. 1:
FOB-NS
FOB-NL
When you tighten the battery cover, make sure that not too much pressure
is put on the weighing plate. The load cell may be damaged.
FOB-N-BA-e-1410 9

In the menu you can activate the AUTO-OFF function (see chap. 8.4.2 “Automatic
switch-off function“). According to the selected settings, the balance switches
automatically off in order to spare the battery.
The empty battery is indicated on the display by „LobAt“. Press button and
change the battery/batteries immediately.
If the balance is not used for a longer time, take out the battery/ies and store it/them
separately. Leaking battery liquid could damage the balance.
5.5 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
warming up time the balance must be connected to the power supply (mains or
battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
5.6 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.
5.7 Adjustment
The adjustment should be made with the recommended adjustment weights (see
chap. 1 "Technical data").
10 FOB-N-BA-e-1410

Procedure when adjusting:
Observe stable environmental conditions.
A warming up time (see chapter 1; Technical Data) is required for stabilization.
Ensure that there are no objects on the weighing plate.
Models FOB-NS:
Balance display
Operation

(example)
Switch off the balance
Press and hold , press 3x at the same
time, release - an internal value is displayed.

(example)
Press , "0" is displayed
Put adjustment weight in the centre of the weighing
plate and press , "CAL" is displayed, followed
by the value of the adjustment weight.
Take away adjustment weight
The balance changes into weighing mode.
Adjustment has now been completed successfully.
FOB-N-BA-e-1410 11

Models FOB-NL:
Balance display
Operation

(example)
Switch off the balance
Press and hold , press 3x at the same
time, release - an internal value is displayed.

(example)
Press , "0" is displayed
Put adjustment weight in the centre of the weighing
plate, wait for stability display and press ,
"CAL" is displayed, followed by the value of the
adjustment weight.
Take away adjustment weight
The balance changes into weighing mode.
Adjustment has now been completed successfully.
12 FOB-N-BA-e-1410

6 Operating elements
6.1 Keyboard overview
6.1.1 Models FOB-NS:
Button
Designation
Pressed once and released
[ON/OFF] •Turn on/off
•Call up adjustment (press and hold button)
[TARE] •Taring
In menu:
•Passing through menu
items from top to
bottom
[UNIT] •Weighing units
switching over
•Invoke adjustment
•Passing through menu
items from left to right
FOB-N-BA-e-1410 13

6.1.2 Models FOB-NL:
Button
Designation
Pressed once and released
[ON/OFF] •Turn on/off
•Call up adjustment (press and hold button)
[TARE]
•Taring
•Display backlight
(press button long
time)
In menu:
•Passing through menu
items from top to
bottom
[UNIT] •Weighing units
switching over
•Call up adjustment
(press shortly 3x)
•Passing through menu
items from left to right
[HOLD] •Call up hold function
14 FOB-N-BA-e-1410

6.2 Overview of display
6.2.1 Models FOB-NS:
Display
Description
g, lb, oz, ozt, dwt Display weighing units
Stability display
6.2.2 Models FOB-NL:
Display
Description
g, lb, oz, ozt, dwt Display weighing units
Stability display
HOLD Display hold function
NET Display net weight
FOB-N-BA-e-1410 15

7 Operation
7.1 Simple weighing
Balance display
Operation
Start balance by pressing .
The balance will carry out a self-test.
Wait for „0“ display
If the balance should not exactly display "0" despite
the relieved weighing pan, press
("L" models) or
("S" models).
The balance returns to „0“
(example)
Place goods to be weighed on balance.
Wait until the stability display appears.
Read weighing result.
To switch off the balance press shortly .
16 FOB-N-BA-e-1410

7.2 Taring
The dead weight of any weighing container may be tared away by pressing a button,
so that the following weighing procedures show the net weight of the goods to be
weighed.
Balance display
Operation
(example)
Deposit weighing vessel.
The weight of the container is displayed.
Press ("L" models) or
("S" models),
the zero display appears.
The weight of the container is now internally saved.
(example FOB-NS)
(example FOB-NL)
Place goods to be weighed in the weighing
container.
The net weight of the goods to be weighed is
displayed.
For L models, a triangle appears below the NET
symbol.
7.3 Weighing units switch-over
According to the requirements the balance can be switched over into different units.
These are set in the menu.
In weighing mode, use to change between the set units.
FOB-N-BA-e-1410 17

7.4 Hold function (only "L" models)
The balance has an integrated standstill function (mean value calculation). With this it
is possible to weigh unstable samples to be weighed exactly. There are 2
possibilities:
1.
Balance display
Operation
Start balance by pressing .
The balance will carry out a self-test.
Wait for „0“ display
(example)
Put sample to be weighed in place and press ;
"HOLD" will appear and a small triangle flashes.
During this time, an average value is recorded.
The triangle will stop flashing, the stability display
appears and the weight value obtained is displayed.
By pressing the balance returns to weighing
mode. The triangle disappears.
18 FOB-N-BA-e-1410

2.
Balance display
Operation
Start balance by pressing .
The balance will carry out a self-test.
Wait for „0“ display
(example)
Press , "HOLD" will appear and a small
triangle flashes. During this time put samples to be
weighed in place.
The stability display will appear after a short time,
the triangle will stop flashing and the obtained
weight value is displayed.
By pressing the balance returns to weighing
mode. The triangle disappears.
7.5 Backlight of the display (only "L" models)
The balance has the ability to turn the backlight of the display on or off.
For this purpose press for approx. 3 sec.
FOB-N-BA-e-1410 19

8 The menu
8.1 Call up menu
„L“-Models:
•Switch off the balance
•Press and hold and press 3x at the same time, then release both
buttons.
„S“-Models:
The menu is accessed by pressing in weighing mode for approx. 3 seconds.
8.2 Navigation in the menu
Button Direction in the
menu Description
(„L“-models)
(„S“-models)
•Passing through menu items
from top to bottom
•Confirm selection
•
Passing through menu items
from left to right
20 FOB-N-BA-e-1410