KERN EFS Series User manual

KERN & Sohn GmbH
www.kern-sohn.com
Ziegelei 1
72336 Balingen-Frommern
Germany
+0049-[0]7433-9933-0
+0049-[0]7433-9933-149
[e-mail]
Operating instructions
Precision balance
KERN EFS
Type TEFS-A
Version 1.1
2022-04
GB
EFS-BA-e-2211

EFS-BA-e-2211
2
GB
KERN EFS
Version 1.12022-04
Operating instructions - Precision Balance
Contents
1Technical data................................................................................................ 3
2Basic Information (General).......................................................................... 5
2.1 Proper use................................................................................................................. 5
2.2 Improper Use............................................................................................................. 5
2.3 Warranty.................................................................................................................... 5
2.4 Monitoring of Test Equipment.................................................................................... 6
3Basic Safety Precautions.............................................................................. 6
3.1 Pay attention to the instructions in the Operation Manual .......................................... 6
3.2 Personnel training...................................................................................................... 6
4Transport and storage................................................................................... 6
4.1 Testing upon acceptance........................................................................................... 6
4.2 Packaging / return transport....................................................................................... 6
5Unpacking, Installation and Commissioning............................................... 7
5.1 Installation Site, Location of Use................................................................................ 7
5.2 Unpacking and checking............................................................................................ 8
5.2.1 Placing........................................................................................................................................ 8
5.2.2 Scope of delivery........................................................................................................................ 8
5.2.3 Stackability ................................................................................................................................. 8
5.3 Overview of displays.................................................................................................. 9
5.4 Keyboard overview .................................................................................................... 9
5.5 Battery operation (Standard).....................................................................................10
5.6 Mains connection (option).........................................................................................10
5.7 Initial Commissioning................................................................................................10
5.8 Adjustment................................................................................................................11
6Operation...................................................................................................... 12
6.1 Weighing...................................................................................................................12
6.2 Taring .......................................................................................................................12
6.3 Weighing Units..........................................................................................................13
7Menu ............................................................................................................. 13
7.1 Navigation in the menu.............................................................................................13
7.2 Menu overview..........................................................................................................14
7.3 Description of individual menu items.........................................................................14
7.3.1 Weighing units switch-over....................................................................................................... 14
7.3.2 Zero tracking............................................................................................................................. 14
7.3.3 AUTO-OFF function.................................................................................................................. 15
7.3.4 Reset function........................................................................................................................... 16
8Servicing, maintenance, disposal .............................................................. 16
8.1 Cleaning ...................................................................................................................16
8.2 Servicing, maintenance.............................................................................................16
8.3 Disposal....................................................................................................................16
9Instant help for troubleshooting................................................................. 17
10 Declaration of conformity ........................................................................... 18

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1 Technical data
KERN EFS 200-1 EFS 500-2 EFS 600-1
Type/Article number TEFS 220-1-A TEFS 500-2-A TEFS 620-1-A
Readability (d) 0.1 g 0.01 g 0.1 g
Weighing range (max) 220 g 500 g 620 g
Reproducibility 0.2 g 0.02 g 0.2 g
Linearity ± 0.3 g ± 0.03 g ± 0.3 g
Recommended adjustment
weight, not added (class) 200 g
(M1)
500 g
(F2)
500 g
(M2)
Stabilization time (typical) 2-3 sec.
AUTO-OFF-function
(With battery operation)
OFF, 30 sec, 1 min, 3 min.
Units dwt, g, gn, oz, ozt, lb
Operating temperature +10°C… +40°C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 145 x 205 x 45
Weighing plate mm 134 x 127
Battery operation (Standard) 4 x 1.5 V AA
Operating period: 200 h
Mains adapter (optional) 6 V / 1 A

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KERN EFS 2000-0 EFS 3000-1 EFS 5000-0
Type/Article number TEFS 2200-0-A TEFS 3000-1-A TEFS 5200-0-A
Readability (d) 1 g 0.1 g 1 g
Weighing range (max) 2200 g 3000 g 5200 g
Reproducibility 2 g 0.2 g 2 g
Linearity ± 3 g ± 0.3 g ± 3 g
Recommended adjustment
weight, not added (class) 2000 g
(M1)
3000 g
(F2)
5000 g
(M1)
Stabilization time (typical) 2-3 sec.
AUTO-OFF-function
(with battery operation)
OFF, 30 sec, 1 min, 3 min.
Units dwt, g, gn, oz, ozt, lb
Operating temperature +10°C… +40°C
Humidity of air max. 80 % (not condensing)
Housing (B x D x H) mm 145 x 205 x 45
Weighing plate mm 134 x 127
Battery operation (Standard) 4 x 1.5 V AA
Operating period: 200 h
Mains adapter (optional) 6 V / 1 A

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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 pan. 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 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 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 installed or incorrectly electrically connected
- The measuring system is overloaded

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2.4 Monitoring of Test Equipment
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 equipment 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 staff.
4 Transport and storage
4.1 Testing upon acceptance
When receiving the appliance, please checkpackaging immediately, andthe 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 put aside 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.

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5 Unpacking, Installation 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 charging of the material to be weighed, weighing container
and windshield.
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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5.2 Unpacking and checking
Remove the device and the accessories from the packaging, remove the packaging
material and place the device on the allocated work place. Check if that there has been
no damage and that all items of delivery scope are present.
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:
KERN EFS
•Balance
•Batteries (4 x 1.5V AA)
•Operating instructions
5.2.3 Stackability
There is a possibility to stack up to 5 scales on top of each other

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5.3 Overview of displays
1
Battery display
2
Bar graph
3
Net weight
4
Negative value
5
Balance set at zero
6
Stability display
7
Weighing Units
5.4 Keyboard overview
•Switch-on balance (press button shortly)
•Switch off balance (press button long time)
•
In menu
: Confirm menu item
•Tare/set on zero the balance
•Menu access (press button long time)
•
In menu
: Select menu items

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5.5 Battery operation (Standard)
Remove the battery cover under the weighing pan. Insert 4 x 1.5 V batteries. Reinsert
the battery cover.
In order to save the battery, the balance switches automatically off after 3 minutes
without weighing.
•If the batteries are approximately exhausted, the battery symbol appears on the
display.
•If the batteries are completely exhausted, the battery symbol and „Lo bAt“
appear on the display.
•Press button and change 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.
5.6 Mains connection (option)
Power is supplied via the external mains adapter KERN YKA-27 (optional). 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.
5.7 Initial Commissioning
A warming up time of 3 minutes after switching on stabilizes the measuring values.
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter “Adjustment”.