KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Precision balances
KERN EWJ
Version 1.1
02/2014
GB
EWJ-BA-e-1411
2 EWJ-BA-e-1411
GB
KERN EWJ
Version 1.1 02/2014
Operating manual
Precision balance
Contents
1 Technical data ................................................................................................ 4
2 Appliance overview ....................................................................................... 6
2.1 Keyboard overview ..................................................................................................................... 8
2.2 Overview of display .................................................................................................................... 9
3 Basic Information (General) ........................................................................ 10
3.1 Proper use ................................................................................................................................ 10
3.2 Improper Use ............................................................................................................................ 10
3.3 Warranty ................................................................................................................................... 10
3.4 Monitoring of Test Resources................................................................................................... 11
4 Basic Safety Precauti on s ............................................................................ 11
4.1 Pay attention to the instructions in the Operation Manual ........................................................ 11
4.2 Personnel training ..................................................................................................................... 11
5 Transport and storage ................................................................................. 11
5.1 Testing upon acceptance ......................................................................................................... 11
5.2 Packaging / return transport ..................................................................................................... 11
6 Unpacking, Setup and Commissioning ..................................................... 12
6.1 Installation Site, Location of Use .............................................................................................. 12
6.2 Unpacking, Scope of delivery ................................................................................................... 12
6.2.1 Scope of delivery / serial accessories: ..................................................................................... 12
6.2.2 Installing / removing transport fittings ....................................................................................... 13
6.3 Mains connection ...................................................................................................................... 13
6.4 Storage battery operation (optional) ......................................................................................... 14
6.5 Connection of peripheral devices ............................................................................................. 14
6.6 Initial Commissioning ................................................................................................................ 14
6.7 Adjustment ................................................................................................................................ 15
6.7.1 Manual internal adjustm ent by press ing butt on ........................................................................ 15
6.7.2 Automatic internal adjustment .................................................................................................. 16
6.8 Verification ................................................................................................................................ 17
7 Operation ...................................................................................................... 18
7.1 Start-up ..................................................................................................................................... 18
7.2 Switching Off ............................................................................................................................ 18
7.3 Zeroing...................................................................................................................................... 18
7.6 Percent determination .............................................................................................................. 19
7.7 Parts counting ........................................................................................................................... 20
7.8 Manual totalizing ....................................................................................................................... 21
7.9 Automatic adding-up ................................................................................................................. 24
EWJ-BA-e-1411 3
8 Menu ............................................................................................................. 26
8.1 Navigation in the menu ............................................................................................................. 26
8.2 Access to technology menu...................................................................................................... 27
8.3 Overview ................................................................................................................................... 28
9 Interfaces ...................................................................................................... 31
9.1 Technical data .......................................................................................................................... 31
9.2 Printer operation (RS 232)........................................................................................................ 32
9.3 Output log (continuous output) ................................................................................................. 33
10 Servicing, maintenance, disposal .............................................................. 33
10.1 Clean ........................................................................................................................................ 33
10.2 Servicing, maintenance ............................................................................................................ 33
10.3 Disposal .................................................................................................................................... 33
11 Instant help ................................................................................................... 34
12 Declaration of conformit y ........................................................................... 35
4 EWJ-BA-e-1411
1 Technical data
KERN EWJ 300-3 EWJ 300-3H EWJ 3000-2
Readability (d) 0.001 g 0.001 g 0.01 g
Weighing range (max) 300 g 300 g 3000 g
Reproducibility 0.001g 0.001g 0.01g
Linearity ±0.003 g ±0.003 g ±0.03 g
Smallest part weight for
piece counting
2 mg 2 mg 20 mg
Reference quantities at
piece counting
10, 20, 50, 100, 200
Weighing Units
g, ct, dwt, lb, mo, oz, ozt, tl (HK), tl (Singap., Malays), tl (Tw)
Adjustment internal
Warm-up time 2 hours
Stabilization time (typical) 3 sec.
Operating temperature + 5° C .... + 40° C
Humidity of air max. 80 % (not condensing)
Dimensions, completely
assembled (wind shield)
(W x D x H) mm
220 x 315 x 180 220 x 315 x 321 220 x 315 x 180
Dimension s of the housin g
(B x D x H) mm
220 x 315 x 95
Dimensions of windshield
inside (B x D x H) mm
145 x 160 x 80 155 x 175 x 217 -
Dimensions of windshield
outside (B x D x H) mm
158 x 143 x 82 180 x 191 x 230 -
Weighing plate, stainless steel
(mm)
Ø 80 Ø 120
Weight kg (net) 2200 g 2560 g 2900 g
Input voltage balance 12 V / 2500 mA
Rechargeable battery (optional) Service life – background illumination ON 10 h
Operating time – background illumination OFF 15
Loading time 4h
Interfaces RS-232
USB
EWJ-BA-e-1411 5
KERN EWJ 600-2M EWJ 6000-1M
Readability (d) 0.01 g 0.1 g
Weighing range (max) 600 g 6000 g
Reproducibility 0.01 g 0.1 g
Linearity ± 0,03 g ± 0.3 g
Verification value (e) 100 mg 1 g
Verification class II II
Minimum weight (min) 500 mg 5 g
Smallest part weight for
piece counting
20 mg 20 mg
Reference quantities at
piece counting
10, 20, 50, 100, 200
Weighing unit g g
Adjustment internal
Warm-up time 2 hours 2 hours
Stabilization time (typical) 3 sec.
Operating temperature + 5° C .... + 40° C
Humidity of air max. 80 % (not condensing)
Dimensions fully mounted (wind
shield) (W x D x H) mm
220 x 315 x 180 -
Dimension s of the housin g
(B x D x H) (mm)
220 x 315 x 95
Dimensions of windshield
inside (B x D x H) mm
145 x 160 x 80 -
Dimensions of windshield
outside (B x D x H) mm
158 x 143 x 82 -
Weighing plate, stainless steel
(mm)
Ø 80 Ø 120
Weight kg (net) 2560 g 2900 g
Input voltage balance 12 V / 2500 mA
Rechargeable battery (optional) Service life – background illumination ON 10 h
Operating time – background illumination OFF 15
Loading time 4h
Interfaces RS-232
USB
6 EWJ-BA-e-1411
2 Appliance overview
Example EWJ 300-3 / EWJ 600-2M:
1. Windshield
2. Weighing pan
3. Levelling screw
4. Bubble level
5. Keyboard
6. Display
7. RS-232
8. USB
9. Terminal power supply unit
10. Battery compartment
11. Transportation locks
12. Adjustment switch
EWJ-BA-e-1411 7
Example EWJ 300-3H:
13. Windshield
14. Weighing pan
15. Display
16. Bubble level
17. Keyboard
18. Levelling screw
19. RS-232
20. USB
21. Terminal power supply unit
22. Battery compartment
23. Transportation locks
24. Adjustment switch
8 EWJ-BA-e-1411
2.1 Keyboard overview
Key Function Function in Menu
Calculate weighing data via
interface
Exit menu / back to weighing mode.
Switch-over weighing unit Scroll forward in menu
Parts counting
Delete total added memory
Percent determination
Start internal adjustme nt (longer
pressing of the button)
Taring
Zeroing Take over selected setting
Turn on/off
EWJ-BA-e-1411 9
2.2 Overview of display
Zero indicator
The displayed weighing value is a net weighing value
Capacity display
The bar graph display moves from the left to the right
and proceeds equally to the weight loaded onto the
weighing balance. Its full width is reached at maximum
load.
This is an analogue display of the current allocation of
the weighing area.
ο
Stability display
Pcs Indicator for counting
% Indicator for percent deter mi nat ion
Currently selected weight unit
fully loaded
Loading status of the rechargeable battery (prerequisite
menu setting „P9batt on“, see chap. 8.2).
The number of segments informs about the loading
status of the rechargeable battery.
1/2 loaded
empty
10 EWJ-BA-e-1411
3 Basic Information (General)
3.1 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.
3.2 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 faul ts 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.
3.3 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
EWJ-BA-e-1411 11
3.4 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.
4 Basic Safety Precautions
4.1 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.
4.2 Personnel training
The appliance may only be operated and maintained by trained personnel.
5 T ransport and storage
5.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
5.2 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.
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