KERN EFC 30K-3 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]
User manual
Platform scales
KERN EFC
TEFC-A type
Version 1.0
2021-06
GB
TEFC_A-BA-e-2110

2 TEFC_A-BA-e-2110
GB
KERN EFC
Ver. 1.0 2021-06
User manual
Platform scales
Contents
1Technical specification............................................................................................4
2Declaration of Conformity........................................................................................8
3Device overview......................................................................................................9
3.1 Parts .................................................................................................................9
3.2 Keyboard ........................................................................................................10
3.2.1 Introducing the numerical value ...............................................................11
3.3 Symbol ...........................................................................................................11
4Basic instructions (general information) ................................................................12
4.1 Intended use...................................................................................................12
4.2 Non-intended use ...........................................................................................12
4.3 Guarantee ......................................................................................................12
4.4 Testing equipment supervision.......................................................................13
5Basic safety instructions........................................................................................13
5.1 Compliance with the instructions included in the user manual .......................13
5.2 Personnel training...........................................................................................13
6Transport and storage...........................................................................................13
6.1 Checking during reception..............................................................................13
6.2 Packaging / return transport ...........................................................................13
7Unpacking, positioning and start-up......................................................................14
7.1 Installation place, operation place ..................................................................14
7.2 Unpacking and check .....................................................................................14
7.3 Installation, setting and leveling......................................................................15
7.4 Pin use for the connection cable ....................................................................16
7.5 Power supply..................................................................................................17
7.6 Rechargeable battery operation .....................................................................17
7.6.1 Battery charging.......................................................................................18
7.7 Connecting peripherals...................................................................................18
7.8 First start ........................................................................................................18
7.9 Adjustment .....................................................................................................18

TEFC_A-BA-e-2110 3
8Operation ..............................................................................................................20
8.1 Switching on/off ..............................................................................................20
8.2 Zeroing ...........................................................................................................20
8.3 Ordinary weighing...........................................................................................20
8.4 Weighing with tare..........................................................................................21
8.5 Weight unit switching......................................................................................21
8.6 Counting the number of pieces.......................................................................22
8.7 Test weighing .................................................................................................23
8.7.1 Test weighing...........................................................................................23
8.7.2 Check counting ........................................................................................26
8.8 Summing ........................................................................................................28
8.9 Animal weighing .............................................................................................29
9Setup menu...........................................................................................................30
10 RS-232 interface................................................................................................32
10.1 Technical specification ................................................................................32
10.2 Protocol template (KERN YKB-01N) ...........................................................32
10.3 Printout protocol (continuous data transmission) ........................................32
11 Maintenance, service and disposal....................................................................33
11.1 Cleaning......................................................................................................33
11.2 Maintenance and service ............................................................................33
11.3 Disposal ......................................................................................................33
12 Error messages .................................................................................................33
13 Help for any minor failures.................................................................................34

4 TEFC_A-BA-e-2110
1 Technical specification
KERN EFC 30K-3 EFC 30K-3L
Product number / type TEFC 30K-3-A TEFC 30K-3L-A
Interval (d) 0.002 kg 0.002 kg
Weighing range (Max) 30 kg 30 kg
Reproducibility 0.005 kg/0.01 kg 0.005 kg/0.01 kg
Linearity ±0.004 kg (2 d) ±0.004 kg (2 d)
Minimum piece weight when
counting the number of piec-
es in laboratory conditions*
1 g (0.5 d) 1 g (0.5 d)
Minimum piece weight when
counting the number of piec-
es in standard conditions**
10 g 10 g
Recommended
adjustment weight
(not delivered)
30 kg (M1) 30 kg (M1)
Possible adjustment points 10–100% Max 10–100% Max
Settling time (standard) 3 s
Heating time 30 min
Weight units kg, g, lb, oz, PCS
Air humidity max. 80%, relative (non-condensing)
Permissible
ambient temperature 0°C to +40°C
Input voltage
of the device 5 V, 1 A
Input voltage of
the power supply 100–240 VAC; 50/60 Hz
Battery 3.7 V / 4 Ah
Rechargeable
battery operation
operating time 80 h (illumination off)
operating time 50 h (illumination on)
charging time ca. 5 h
Display housing
dimensions [mm] 252 × 162 × 57 (width × depth × height)
Scale plate,
stainless steel [mm]
400 × 300 × 124 mm 500 × 400 × 120 mm
Net weight [kg] 17 kg 19 kg
Interface RS-232

TEFC_A-BA-e-2110 5
KERN EFC 60K-3 EFC 60K-3L
Product number / type TEFC 60K-3-A TEFC 60K-3L-A
Interval (d) 0.005 kg 0.005 kg
Weighing range (Max)
60 kg
60 kg
Reproducibility 0.001 kg/0.002 kg 0.001 kg/0.002 kg
Linearity ±0.01 kg (2 d) ±0.01 kg (2 d)
Minimum piece weight when
counting the number of pieces
in laboratory conditions*
2.5 g (0.5 d) 2.5 g (0.5 d)
Minimum piece weight when
counting the number of pieces
in standard conditions**
25 g 25 g
Recommended
adjustment weight
(not delivered)
60 kg (F2) 60 kg (F2)
Possible adjustment points 10–100% Max 10–100% Max
Settling time (standard)
3 s
Heating time 30 min
Weight units
kg, g, lb, oz, PCS
Air humidity
max. 80%, relative (non-condensing)
Permissible
ambient temperature 0°C to +40°C
Input voltage
of the device 5 V, 1 A
Input voltage of
the power supply 100–240 VAC; 50/60 Hz
Battery 3.7 V / 4 Ah
Rechargeable
battery operation
operating time 80 h (illumination off)
operating time 50 h (illumination on)
charging time ca. 5 h
Display housing
dimensions [mm] 252 × 162 × 57 (width × depth × height)
Scale plate,
stainless steel [mm]
400 × 300 × 124 mm 500 × 400 × 120 mm
Net weight [kg] 17 kg 19 kg
Interface RS-232

6 TEFC_A-BA-e-2110
KERN EFC 100K-3 EFC 100K-3L EFC 300K-2
Product number / type TEFC 100K-3-A TEFC 100K-3L-A TEFC 300K-2-A
Interval (d) 0.01 kg 0.01 kg 0.02 kg
Weighing range (Max)
150 kg
150 kg
300 kg
Reproducibility 0.002 kg/0.005 kg 0.002 kg/0.005 kg 0.05 kg/0.1 kg
Linearity ±0.02 kg (2 d) ±0.02 kg (2 d) ±0.04 kg (2 d)
Minimum piece weight when
counting the number of piec-
es in laboratory conditions*
5 g (0.5 d) 5 g (0.5 d) 10 g (0.5 d)
Minimum piece weight when
counting the number of piec-
es in standard conditions**
50 g 50 g 100 g
Recommended
adjustment weight
(not delivered)
150 kg (F2) 150 kg (F2) 300 kg (M1)
Possible adjustment points 10–100% Max 10–100% Max 10–100% Max
Weight units
kg, g, lb, oz, PCS
Settling time (standard) 2 s
Heating time
30 min
Air humidity
max. 80%, relative (non-condensing)
Permissible
ambient temperature 0°C to +40°C
Input voltage
of the device 5 V, 1 A
Input voltage of
the power supply 100–240 VAC; 50/60 Hz
Battery 3.7 V / 4 Ah
Rechargeable
battery operation
operating time 80 h (illumination off)
operating time 50 h (illumination on)
charging time ca. 5 h
Display housing
dimensions [mm] 252 × 162 × 57 (width × depth × height)
Scale plate,
stainless steel [mm]
500 × 400 × 120 mm 600 × 500 × 140 mm 600 × 500 × 140 mm
Net weight [kg] 19 70 70
Interface RS-232
* Minimum piece weight when counting the number of pieces in laboratory conditions:
There are optimum ambient conditions to count pieces with high resolution
No diversification of the counted pieces’ weight
**Minimum piece weight when counting the number of pieces in standard conditions:
There are unsteady ambient conditions (wind gusts, vibrations)
There is diversification of the counted pieces’ weight

TEFC_A-BA-e-2110 7
Dimensions:
Models EFC 30K-3, EFC 60K-3:
Models EFC 30K-3L, EFC 60K-3L, EFC 100K-3:
Models EFC 100K-3L, EFC 300K-2:

8 TEFC_A-BA-e-2110
2 Declaration of Conformity
The valid Declaration of Conformity EC/UE is available at:
www.kern-sohn.com/ce

TEFC_A-BA-e-2110 9
3 Device overview
3.1 Parts
Item Name
1 Display housing
2 Display
3 Keyboard
4 Support
5 Scale plate
6 Leveling screw foot
7 RS-232 interface
8 Connection cable port
9 Guide rail
10 Limiter
11 Power supply socket

10 TEFC_A-BA-e-2110
3.2 Keyboard
Button Name Function in the operating
mode
Menu function
PRINT
button
Weight data transfer via
the interface
Activating the animal
weighing mode (by press-
ing and holding the but-
ton)
TOL but-
ton
Activating test weighing
Setting the indication con-
ditions and limit values for
test weighing (by pressing
and holding the button)
MODE
button
Activating the piece count-
ing mode
Displaying the configuration
menu
(by pressing and holding the
button)
Leaving menu / return to the
weighing mode
Mbutton
Summing
Displaying the “total” val-
ue
Selecting the menu items
Setting confirmation
TARE
button Taring Setting selection
ZERO
button Zeroing
ON/OFF
button Switching on/off

TEFC_A-BA-e-2110 11
3.2.1 Introducing the numerical value
Button Name Function
Navigation button Selection of the right-hand digit
Navigation button Increasing the digit value (0–9)
Navigation button Confirmation of the entered data
3.3 Symbol
The red LED above or beside the symbols will be lit once the following conditions are
met:
Symbol Description
Battery charging indicator
Discharged battery
HOLD “Animal weighing” application
Tolerance symbols for check weighing
PCS “Counting the number of pieces” application
MODE Menu setting indicator
TOTAL “Summing” application
NET Net weight value indicator
Stabilization indicator
Zero indicator

12 TEFC_A-BA-e-2110
4 Basic instructions (general information)
4.1 Intended use
The scale you bought is intended for weighing the weighed material. It should be con-
sidered a “non-automatic scale”, e.g. the weighed material should be carefully placed
manually on the scale plate center. The weight can be read after it has stabilized.
4.2 Non-intended use
The scale is not intended for dynamic weighing, e.g. for removing or adding small
amounts of the weighed material. The scale’s “stabilizing and compensating” mecha-
nism can result in displaying erroneous weighing results! (Example: slow outflow of the
liquid from the container placed on the scale.)
Do not subject the plate to long-term load. This may damage the weighing mechanism.
Avoid any scale impact and overload higher than the stipulated maximum load (Max),
deducting the tare from the existing load. This could damage the scale.
Never operate the scale in explosive atmospheres. The standard version is not explo-
sion-proof.
Never introduce any structural modifications to the scale. This may result in displaying
erroneous weighing results, violating the technical safety conditions, and also in scale
damage.
The scale should always be operated in line with the provided guidelines. Other opera-
tion ranges / areas require a written consent of KERN.
4.3 Guarantee
The warranty expires:
•if you fail to follow our guidelines included in the user manual;
•if you fail to use the device in line with the intended use;
•if you introduce any modifications or open the device;
•if the device gets damaged mechanically or damaged by the utilities, liquids and
ordinary wear and tear;
•if the device is not set correctly or the electrical system is not as required;
•if the weighing mechanism gets overloaded.

TEFC_A-BA-e-2110 13
4.4 Testing equipment supervision
Within the quality assurance system, you must check the technical measurement
properties of the scale and possibly of the available reference weight regularly. To that
aim, the responsible user should define a relevant cycle, as well as the type and scope
of such an inspection. The information on the supervision of the testing equipment,
which are scales and the required reference weights, can be found on the home page
of KERN (www.kern-sohn.com). The reference weights and scales can be calibrated
fast and for a low cost in the KERN calibration laboratory (against the national refer-
ence) approved by DKD (Deutsche Kalibrierdienst).
5 Basic safety instructions
5.1 Compliance with the instructions included in the user manual

Before you set and start the device, read this user manual thoroughly
even if you are familiar with KERN scales.
All language versions contain non-binding translation.
Only the original document in German is binding.
5.2 Personnel training
The device can be operated and maintained solely by trained workers.
6 Transport and storage
6.1 Checking during reception
Immediately after you have received the shipment, please check if it is free from any
visible outer damage. The same applies for the unpacked device.
6.2 Packaging / return transport

Please keep all the parts of the original packaging in case you had to
send it back to us.
Always use the original packaging for the return transport.
Before you dispatch the device, disconnect any connected cables as
well as loose/moving parts.
Reinstall any transport locks, if present.

Protect all the parts, e.g. wind breaker, scale plate, power supply etc.
from slipping and damage.

14 TEFC_A-BA-e-2110
7 Unpacking, positioning and start-up
7.1 Installation place, operation place
The scales are designed to ensure reliable weighing results in standard operating
conditions.
The choice of a correct scale location ensures its accurate and fast operation.
This is why you should follow the following rules when selecting the installation
place:
•Place the scale on stable, flat surface.
•Avoid extreme temperatures and temperature fluctuations, occurring e.g. when
you place it at the radiator or in a place exposed to direct sun rays.
•Protect the scale from the direct draft present at open windows and doors.
•Avoid impact when weighing.
•Protect the scale from high humidity of air, vapours and dust.
•Do not expose it to long-term heavy moisture. Any forbidden condensation of
the air moisture on the device may occur when a cold device is placed in a
much hotter environment. In such circumstances, leave the device not connect-
ed to the mains for 2 hours to adapt to the ambient temperature.
•Avoid static discharge from the weighed material and scale container.
If there are any electromagnetic fields, static discharge and unstable power supply,
high readout deviations (erroneous weighing results) may occur. In such circumstanc-
es, change the location.
7.2 Unpacking and check
Remove the device and accessories from the packaging, remove the packaging mate-
rial and place the device in the target location. Check if all components included in the
delivery are present and not damaged.
Scope of delivery / standard accessories:
•Scale, see chapter 3.1
•Power supply
•User manual
•Dust cover

TEFC_A-BA-e-2110 15
7.3 Installation, setting and leveling
Whenever required, remove the transport protection.
Install the support and display as shown in the figure.
1. The connection cable led through the support
Do not crush or damage the cable.
2. The holder fixed with three bolts
3. Bolt for display fixing
4. Knob for display positioning
5. Connection cable connected to the terminal
Place the scale on smooth surface.

16 TEFC_A-BA-e-2110
Level the scale using the leveling feet. The air bubble in the leveler must be pre-
sent in the marked area.
Check leveling at regular intervals.
7.4 Pin use for the connection cable
Pin 1 + signal
Pin 2 - signal
Pin 3 Screen
Pin 4 Exc –
Pin 5 Exc +
The display supports load cells 350 Ω.
Supply voltage: 3.3 VDC +5%

TEFC_A-BA-e-2110 17
7.5 Power supply
Check if the scale voltage is set correctly. The scale can be connected
to the mains only when the voltage specified on the scale (sticker) and
the local voltage are identical.
Always use the original power supply by KERN. Using any other prod-
ucts requires KERN consent.
Important information:
Before you start the device, check the power cord for damage.
The power cord must not have any contact with liquids.
The plug must be always readily available.
7.6 Rechargeable battery operation
PLEASE
NOTE!
The rechargeable battery and the charger are compatible. Always use the
power supply delivered with the scale.
Do not use the scale when charging.
Always replace the battery with the one of the same type or of the type rec-
ommended by the manufacturer.
The battery is not protected against all the environmental impacts. Expos-
ing the battery to specific environmental conditions may result in its fire or
explosion. It may result in serious injuries or material losses.
Protect the battery from fire and heat.
Do not allow the battery to have any contact with liquids, chemicals or salts.
Do not expose the battery to high pressure or microwave radiation.
Do not modify any batteries, charger and do not tamper them.
Do not use any faulty, damaged or deformed battery.

Do not connect the electrical contacts of the battery and do not use any
metal items to short circuit them.

The electrolyte may be released by the damaged battery. Any contact of
the electrolyte with the skin or eyes may irritate them.
When you place o
r replace batteries, always pay attention to the correct
polarity (see the information in the battery compartment).

When the power supply is connected, the battery operation mode is
switched off. Always remove the battery for weighing in the power supply
mode longer than 48 h! (Overheating danger).

If you detect any odor emitted by the battery, its heating, discoloration or
deformation, disconnect it immediately from the power supply and, when-
ever possible, from the scale.

18 TEFC_A-BA-e-2110
7.6.1 Battery charging
The rechargeable battery is charged using the supplied power cord.
Before first use, charge the battery for at least 5 hours using the power cord.
The battery symbol displayed on the screen means that the battery capacity will
soon run down. The device may operate ca. 30 minutes longer and then it will be
switched off automatically. When the scale operates further without charging, a blink-
ing <LO-BAT> symbol will be displayed.
Charge the battery using the provided power supply.
When charging, LED informs of the battery status.
red: The battery is being charged
green: The battery is fully charged
7.7 Connecting peripherals
Before you connect or disconnect any extra devices (printer, computer) to/from the
data interface, the scale should always be disconnected from the mains.
Use solely accessories and peripherals supplied by KERN with the scale, being per-
fectly compatible with it.
7.8 First start
To get accurate weighing results using electronic scales, ensure the scales achieves
the appropriate operating temperature (see “Heating time”, chapter 1). During the
heating time, the scale must be connected to the power source (the socket, recharge-
able battery or batteries).
The scale accuracy depends on the local standard gravity.
Always follow the guidelines in the “Adjustment” chapter.
7.9 Adjustment
As the standard gravity value is not the same in every spot on Earth, every display
with the scale plate connected should be adjusted, in line with the weighing rules re-
sulting from the laws of physics, to the standard gravity in the scale location (provided
the scale system has not already been subject to factory adjustment in its location).
Such an adjustment process should be carried out during the first start, following every
location change and also in the case of any ambient temperature fluctuations. To en-
sure achieving accurate measurement date, it is also recommended to carry out regu-
lar display adjustment also in the weighing mode.

TEFC_A-BA-e-2110 19
•Prepare the required adjustment weight, see chapter 1.
Whenever possible, adjust using the adjustment weight with the weight simi-
lar to the maximum load of the scale (the adjustment weight is recommend-
ed, see chapter 1). The adjustment may also be carried out using weights
with other nominal values or tolerance classes, but this is not optimal from
the measurement technique perspective. The adjustment weight precision
must correspond to the interval [d] of the scale, though preferably it should be
a bit higher. For information concerning reference weights, see online at:
http://www.kern-sohn.com
•
Ensure stable environmental conditions. The heating time is required for the
stabilization (see chapter 1).
•Ensure there are no objects on the scale plate.
What to do:
Switch the scale off.
With TOL pressed, switch the scale on using ON/OFF. During the autotest, press
TOL and hold it for 10 s until < > is displayed.
If required, use TARE to change the interval (d),
you can choose from 1 d, 2 d, 5 d, 10 d, 20 d, 50 d.
Confirm by pressing TOL, < > will be displayed.
If required, use TARE to change the number of decimal places,
you can choose from 0, 0.0, 0.00, 0.000, 0.0000.
Confirm by pressing TOL, < > will be displayed.
Press TARE, the maximum load (Max) will be displayed. Red LED above PCS
will be lit.
If required, change the value using TARE and ZERO (Entering a value in the
numerical form, see chapter 3.2.1).
Confirm by pressing TOL, < > will be displayed.
Ensure there are no objects on the scale plate.
Once the stability check is completed successfully (red LED above is lit),
confirm by pressing TOL, < > is displayed.
Place the adjustment weight and confirm by pressing TARE.
The weight of the last used adjustment weight will be displayed. If required,
change the value using TARE and ZERO (Entering a value in the numerical form,
see chapter 3.2.1).
Confirm by pressing TOL.
Wait until < > is displayed.
After the successful adjustment, the scale will switch to the weighing mode again
automatically.
If there is any adjustment error or if an incorrect adjustment weight is used, the
error message is displayed. Repeat the adjustment process.
Remove the adjustment weight.

20 TEFC_A-BA-e-2110
8 Operation
8.1 Switching on/off
Switching on:
Press the ON/OFF button.
Once the displays is lit, the scale autotest will be carried out.
Wait until the weight is displayed, the scale is ready for use.
Switching off:
Press the ON/OFF button, the display will go off.
8.2 Zeroing
Zeroing corrects the effect of small pollutants on the scale plate.
Remove the load from the scale.
Press ZERO, the zero indications and <ZERO> symbol will be displayed.
8.3 Ordinary weighing
Check the zero indication, whenever required zero by pressing the ZERO button.
Place the weighed material.
Wait until the stabilization indicator is displayed.
Red LED above will be lit.
Read out the weighing result.
Overload warning
Always avoid any device overload higher than the stipulated maximum
load (Max
), deducting the tare from the existing load. This could damage
the device.
The exceeded maximum load is indicated with --ol--. Reduce the scale
load or reduce the initial load.