KERN EMS 300-3 User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-mail:[e-mail]
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Instruction Manual
School balance
KERN EMS
Version 1.6
2017-10
GB
EMS-BA-e-1716

2 EMS-BA-e-1716
GB
KERN EMS
Version 1.62017-10
Instruction Manual
School 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................................................................................................. 6
3Basic Safety Precautions.............................................................................. 7
3.1 Pay attention to the instructions in the Operation Manual.................................................. 7
3.2 Personnel training.................................................................................................................... 7
4Transportation & Storage.............................................................................. 7
4.1 Testing upon acceptance ........................................................................................................ 7
4.2 Packaging / return transport ................................................................................................... 7
5Unpacking, Setup and Commissioning ....................................................... 8
5.1 Installation Site, Location of Use............................................................................................ 8
5.2 Unpacking/installation............................................................................................................. 8
5.3 Mains connection..................................................................................................................... 9
5.4 Operation using a (rechargeable) battery (optional) ............................................................ 9
5.5 Initial Commissioning............................................................................................................ 10
5.6 Linearization ........................................................................................................................... 11
5.7 Adjustment.............................................................................................................................. 14
5.8 Adjustment.............................................................................................................................. 14
6Operating elements ..................................................................................... 15
6.1 Overview of display................................................................................................................ 15
6.2 Keyboard overview................................................................................................................. 15
7Operation...................................................................................................... 16
Start-up................................................................................................................................................. 16
Switching Off ....................................................................................................................................... 16
Weighing............................................................................................................................................... 16
Taring.................................................................................................................................................... 16
PRE-TARE function............................................................................................................................. 17
Weighing units switch-over................................................................................................................ 18
Plus/minus weighings......................................................................................................................... 18
Parts counting ..................................................................................................................................... 19
Net-total weighings ............................................................................................................................. 20
Percent determination......................................................................................................................... 21

EMS-BA-e-1716 3
8Menu ............................................................................................................. 22
8.1 Navigation in the menu.......................................................................................................... 22
8.2 Menu overview........................................................................................................................ 25
8.3 Description of individual menu items .................................................................................. 25
Auto Off function................................................................................................................................. 25
Auto-Zero function .............................................................................................................................. 26
Filter function....................................................................................................................................... 27
Reset to factory setting....................................................................................................................... 28
9Service, maintenance, disposal.................................................................. 29
9.1 Cleaning .................................................................................................................................. 29
9.2 Service, maintenance............................................................................................................. 29
9.3 Disposal................................................................................................................................... 29
10 Instant help................................................................................................... 30
11 Declaration of -Conformity.......................................................................... 31

4 EMS-BA-e-1716
1 Technical data
KERN EMS 300-3 EMS 3000-2
Readability (d) 0,001 g 0,01 g
Weighing range (max) 300 g 3000 g
Taring range (subtractive) 300 g 3000 g
Reproducibility 0,002 g 0,02 g
Linearity ±0,005 g ±0,05 g
Minimum unit weight at
piece counting 0,005 g 0,05 g
Warm-up time 120 min 120 min
Reference quantities at
piece counting 5, 10, 20, 25, 50
Weighing Units dwt, g, oz, ozt
Recommended adjustment
weight, not added (class) 300 g
(F1) 3000 g (F2)
Stabilization time (typical) 3 sec.
Operating temperature + 5° C .... + 35° C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 200 x 280 x 63
Weighing plate mm Ø 105 160 x 160
Windshield rectangular mm inside: 145 x 145 x 65 -
outside: 165 x 165 x 80 -
Weight kg (net) 1,4
Input Voltage 110V-230V AC
Power pack
secondary voltage 9 V, 300mA
Battery operation 9 V compound battery (optional)
Operating period: 40 h
Auto Off 3 min.

EMS-BA-e-1716 5
KERN EMS 6K0.1 EMS 6K1 EMS 12K0.1 EMS 12K1
Readability (d) 0.1 g 1 g 0.1 g 1 g
Weighing range (max) 6 kg 6 kg 12 kg 12 kg
Taring range (subtractive) 6 kg 6 kg 12 kg 12 kg
Reproducibility 0.1 g 1 g 0.1 g 1 g
Linearity ± 0.3 g ± 3 g ± 0.3 g ± 3 g
Minimum unit weight at
piece counting 0.2 g 2 g 0.2 g 2 g
Warm-up time 120 min 30 min 120 min 30 min
Reference quantities at
piece counting 5, 10, 20, 25, 50
Weighing Units dwt, g, oz, ozt
Recommended adjustment
weight, not added (class) 6 kg (F2) 6 kg (M1) 12 kg (F2) 12 kg (M1)
Stabilization time (typical) 3 sec.
Operating temperature + 5° C .... + 35° C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 200 x 280 x 63
Weighing plate mm 160 x 160
Weight kg (net) 1,4
Input Voltage 110V-230V AC
Power pack
secondary voltage 9 V, 300mA
Battery operation 9 V compound battery (optional)
Operating period: 40 h
Auto Off 3 min.

6 EMS-BA-e-1716
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.
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
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.

EMS-BA-e-1716 7
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.
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 possibly supplied transport securing devices.
Secure all parts such as the glass wind screen, the
weighing platform, power unit etc. against shifting and
damage.

8 EMS-BA-e-1716
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 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, 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 and 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.
5.2Unpacking/installation
Carefully remove the balance from the packaging, remove plastic cover and setup
balance at the intended workstation.
The balance must be installed in a way that the weighing plate is exactly in horizontal
position.

EMS-BA-e-1716 9
Scope of delivery / serial accessories
•Balance
•Weighing plate
•Mains power supply
•Windshield, only EMS 300-3
•Instruction Manual
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.
5.4 Operation using a (rechargeable) battery (optional)
Lift-off the battery cover on the lower side of the balance. Connect 9 V compound
battery.
Replace the battery compartment cover.
For battery operation the balance has an automatic switch-off function which can be
activated or deactivated in the menu (see chapter 9.3).
In weighing mode keep the UNIT key pressed until „AF“ appears.
Use the SET key to confirm.
Use the MODE key to choose between the two following settings:
„AF on“:
In order to save the battery, the balance switches automatically
off after 3 minutes without weighing.
„AF off“:
Switch-off function deactivated.
Use the SET key to confirm selection. The balance returns to weighing mode.

10 EMS-BA-e-1716
If the batteries are run down, "LO" appears in the display. Press ON/OFF-key and
replace the batteries immediately.
If the balance is not used for a longer time, take out the batteries and store them
separately. Leaking battery liquid could damage the balance.
If there exists an optional rechargeable battery, it has to be connected in the battery
compartment via a separate plug-in socket. Now the mains adapter delivered with the
rechargeable battery must be applied.
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,
accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.

EMS-BA-e-1716 11
5.6 Linearization
(only models EMS 300-3, EMS 3000-2)
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
Adjustment
weight
EMS 300-3 EMS 3000-2
1.
50 g
500 g
2.
100 g
1000 g
3.
150 g
1500 g
4.
200 g
2000 g
5.
300 g
3000 g
Operation
Display
How to carry out linearization:
Switch on balance
Press repeatedly until AF is
displayed

12 EMS-BA-e-1716
Press repeatedly until LinEAr is
displayed
Ensure that there are no objects on the
weighing pan.
Start linearisation with . The value of the
first adjustment weight will be displayed.
(example)
Place adjustment weight and acknowledge by
. The scales will change to zero display.
Take away adjustment weight. After a short
time the value of the second adjustment weight
appears in the display.
(example)
Place second adjustment weight and
acknowledge by . The scales will change
to zero display.
Take away adjustment weight. After a short
time the value of the third adjustment weight
appears in the display.
(example)
Place third adjustment weight and
acknowledge by . The scales will change
to zero display.
Take away adjustment weight. After a short
time the value of the forth adjustment weight
appears in the display.
(example)
Place forth adjustment weight and
acknowledge by . The scales will change
to zero display.
Take away adjustment weight. After a short
time the value of the fifth adjustment weight
appears in the display.
(example)

EMS-BA-e-1716 13
Place fifth adjustment weight and acknowledge
by . The scales will change to zero
display.
Take away adjustment weight. After a short
time F is displayed.
Finally the balance will switch off automatically. Now the linearization is concluded
successfully.
In case of an adjustment error or incorrect adjusting weight the display will show an
error message; repeat linearization process.

14 EMS-BA-e-1716
5.7 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.
5.8 Adjustment
The adjustment should be made with the recommended adjustment weight (see
chap. 1 "Technical data"). Adjustment is also possible with the weights of other
nominal values (see table 1), but not the optimum for measuring technique.
Procedure when adjusting:
Observe stable environmental conditions. A warming up time (see chapter 1) is
required for stabilization.
Turn on balance by pressing the ON/OFF key.
Press the MODE key and keep it pressed, in the display appears shortly
„CAL“. After that the exact size appears flashing in the display of the
adjustment weight.
Now set the adjusting weight in the centre of the weighing plate.
Press the SET key. Short time later there appears „CAL F“, then the automatic
return to the weighing mode. In the display there appears the value of the
adjustment weight.
An error during adjustment or the use of an incorrect adjusting weight will
result in an error message „CAL E“. Repeat adjustment.
Keep the adjustment close to the balance. Daily control of the weighing exactness is
recommended for quality-relevant applications.

EMS-BA-e-1716 15
6 Operating elements
6.1 Overview of display
6.2 Keyboard overview
Key Description Function
UNIT-key
•How to change weighing units
•Call up menu
(keep key pressed until AF appears)
SET key •Confirm settings in the menu
•Save and exit menu
MODE key
•How to select menu items
•Change settings in the menu
•Adjustment
TARE button •Taring
ON/OFF-switch •Turn on/off

16 EMS-BA-e-1716
7 Operation
Start-up
Press the ON-OFF key.
The balance will carry out a self-test The balance is ready
for weighing when the weight display appears.
Switching Off
Press ON-OFF button, the display disappears
Weighing Position item to be weighed
Read the weighing result in the display
If the material to be weighed is heavier than the weighing
range, the display will show "Error" (=Overload).
Taring
Place an empty weighing container, the weight of the
weighing container will be displayed.
(Example)
Press the TARE button, the zero display disappears.
The tare weight is saved until it is deleted.
8.8.8.8 0g
0g
134g
0g

EMS-BA-e-1716 17
Weigh the material, the net weight will be indicated.
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.
The weight of the weighing container will be displayed as a
minus number after removing the weighing container.
The tare weight is saved until it is deleted.
Delete tare
Unload the balance and press the TARE button, the zero
display appears.
PRE-TARE
function
Using this function the weight of a tare vessel is stored. Even
after turning off/on the weighing balance will continue working
with the saved tare value.
In weighing mode put tare vessel on the weighing plate
Press repeatedly the MODE key until „PtArE“ flashing
appears.
Use SET key to store the current weight on the weighing
plate as a PRE-TARE value.
Delete PRE-TARE
value Remove all loads from the balance, press TARE and press
repeatedly the MODE key until „PtArE“ flashing appears.
Use the SET key to confirm. The PRE-TARE value is
deleted, the zero display appears.
246g
0g

18 EMS-BA-e-1716
Weighing units
switch-over

Press the UNIT key in the weighing mode to switch-over
between the available weighing units
Plus/minus
weighings
For example unit weight control, fabrication control etc.

Put the nominal weight on the weighing plate and tare using
the TARE button.
Remove the nominal weight
Put the test objects subsequently on the weighing plate, the
respective deviation from the nominal weight is displayed
with the respective sign to „+“ and „-“.
According to the same procedure also packages with the
same weight can be produced, referring to a nominal
weight.
Back to weighing mode by pressing the TARE button.

EMS-BA-e-1716 19
Parts counting
During piece counting parts can either be counted into a
container or out of a container.
To count a greater number of
parts
the average weight per part has to be determined with a
small quantity (reference quantity).
The larger the reference quantity, the higher the counting
exactness.
High reference must be selected for small parts or
parts with considerably different sizes.
The larger the reference quantity, the more accurate the parts
counting.
The process has four steps:
Tare the weighing container
Determine the reference unit
Original weighing of reference weight
Count the items
In weighing mode press MODE key shortly. Reference
piece number „5PCS“appears flashing.
By pressing the MODE button several times other reference
quantities 5, 10, 20, 25 and 50 can be called up. Place as
many pieces to count on the weighing plate as the set
reference quantity requires.
Use the SET key to confirm. The balance is now in parts
counting mode counting all units on the weighing plate.

20 EMS-BA-e-1716
•Back to weighing mode by
pressing the MODE button.
•Error message „Er 1“
Piece below minimum weight of piece (See chpt. 1
“Technical specifications“): Press MODE key and restart
reference determination.
•Taring
The tare vessels can also be used for piece counting. Before
starting piece counting use the TARE
button to tare out the container.
Net-total
weighings
It is useful if a mixture of several components is weighed into a
tare vessel and finally the sum weight of all weighed
components is necessary for control purposes (net-
total, i.e.
the weight of the tare vessel).
Example:
1. Place tare container on the weighing plate. Press the TARE
button, the zero display disappears.
2. Weigh-in component . Press the SET button, the zero
display disappears. [] is displayed on the right border of
the display.
3. Weigh-in component and press SET key. Net-total (sum
weight of the components and ) is displayed.
4. Press the SET button, the zero display disappears.
5. Weigh-in component and press SET key. Net-total (sum
weight of the components and and .) is displayed.
If necessary, also fill the formula up to the desired final
value. For every component more repeat the steps 4-5.
Back to weighing mode by pressing the TARE button.