KERN EG 220-3NM 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
Operating instruction
Precision balances
KERN EW/EG-N/EWB
Version 2.7
04/2016
GB
EW/EG-N/EWB-BA-e-1627

EW/EG-N/EWB-e-1627
2
GB
KERN EW/EG-N/EWB
Version 2.7 05/2016
Operating instruction
Precision balances
Table of contents
1Technical data ............................................................................................ 4
1.1 Read-off of the various weighing units........................................................................... 10
1.2 Weighing unit conversion charts ..................................................................................... 11
2Fundamental information (general)........................................................ 12
2.1 Intended use....................................................................................................................... 12
2.2 Inappropriate use............................................................................................................... 12
2.3 Guarantee............................................................................................................................ 12
2.4 Monitoring the test substances........................................................................................ 13
3Fundamental safety information............................................................. 13
3.1 Observe the information in the operating instructions.................................................. 13
3.2 Staff training....................................................................................................................... 13
4Transport and storage............................................................................. 13
4.1 Acceptance check.............................................................................................................. 13
4.2 Packaging / return transport............................................................................................. 13
5Unpacking, installation and commissioning ......................................... 14
5.1 Place of installation, place of use..................................................................................... 14
5.2 Unpacking........................................................................................................................... 15
5.2.1 Installation............................................................................................................................ 15
5.2.2 List of items supplied............................................................................................................ 15
5.2.3 Positioning the weighing plate.............................................................................................. 16
5.2.4 Serial draft shield installation................................................................................................ 16
5.2.5 Draft shield installation – optional......................................................................................... 17
5.2.6 Draft shield with glass sliding doors (only model KERN EW 120-4NM standard)............... 17
5.3 Mains supply....................................................................................................................... 18
5.4 Operation using a rechargeable battery (optional)......................................................... 18
5.5 Connecting peripheral equipment.................................................................................... 19
5.6 Initial start-up...................................................................................................................... 19
5.6.1 Power display....................................................................................................................... 19
5.6.2 Bar graph display.................................................................................................................. 19
5.6.3 Stability indication................................................................................................................. 20
5.6.4 Zero display on the balance ................................................................................................. 20
5.7 Adjustment.......................................................................................................................... 21
5.8 Adjusting............................................................................................................................. 21
5.8.1 Adjusting with externall weight (only KERN EW-B, EW-N).................................................. 21
5.8.2 Adjusting with internal weight (only KERN EG).................................................................... 21
5.8.3 Adjusting with external weight (only KERN EW and EWB).................................................. 23
5.9 Verification.......................................................................................................................... 25
5.10 Verification switch and official seal ................................................................................. 26

EW/EG-N/EWB-e-1627
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6Operation .................................................................................................. 27
6.1 Operating elements............................................................................................................ 27
6.1.1 Overview of the keypad........................................................................................................ 28
6.1.2 Overview of display.............................................................................................................. 29
6.2 Operation ............................................................................................................................ 30
6.2.1 Weighing.............................................................................................................................. 30
6.2.1.1 Underfloor weighing ........................................................................................................................... 31
6.2.1.2 Tare weighing (tare)........................................................................................................................... 32
6.2.2 Piece counting (excl. model KERN EW120-4NM) ............................................................... 34
6.2.2.1 Add mode........................................................................................................................................... 36
6.2.3 Percent weighing (excl. model KERN EW120-4NM) ........................................................... 38
6.2.4 Weighing using a tolerance range (excl. model KERN EW120-4NM)................................ 39
6.2.4.1 Basic settings when weighing using a tolerance range...................................................................... 40
6.2.4.2 Entering the limit values by weighing................................................................................................. 42
6.2.4.3 Entering the limit values using the keyboard...................................................................................... 44
7Functions.................................................................................................. 46
7.1 Access and changing of numerous functions:............................................................... 46
7.2 List of the function parameters ........................................................................................ 47
7.2.1 Parameters when weighing with a tolerance range (excl. model KERN EW120-4NM)...... 49
7.2.2 Parameters for the serial interface....................................................................................... 50
8Data output ............................................................................................... 51
8.1 Description of the serial data output (RS 232C).............................................................. 51
8.2 Technical data of the interface ......................................................................................... 51
8.3 Interface description.......................................................................................................... 52
8.4 Data Output......................................................................................................................... 52
8.4.1 Data Transmission Formats................................................................................................. 52
8.4.2 Algebraic sign....................................................................................................................... 52
8.4.3 Data...................................................................................................................................... 52
8.4.4 Units ..................................................................................................................................... 53
8.4.5 Result of the evaluation / Type of data................................................................................. 53
8.4.6 Data state............................................................................................................................. 53
8.5 Data input commands........................................................................................................ 54
8.5.1 Command input format......................................................................................................... 54
8.5.2 External taring command ..................................................................................................... 54
8.5.3 External control commands.................................................................................................. 54
8.6 Feedback message after data transmission.................................................................... 55
9Maintenance, upkeep, disposal .............................................................. 55
9.1 Cleaning .............................................................................................................................. 55
9.2 Maintenance, upkeep......................................................................................................... 55
9.3 Disposal .............................................................................................................................. 55
10 Troubleshooting....................................................................................... 56
11 Declaration of Conformity ....................................................................... 57

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1 Technical data
KERN EG 220-3NM EG 420-3NM EG 620-3NM
Readout 0,001 g 0,001 g 0,001 g
Verification value (e) 0,01 g 0,01 g 0,01 g
Weighing range (max.) 220 g 420 g 620 g
Class of accuracy II II I
Taring range (subtractive) 220g 420 g 620 g
Minimum load (Min) 0,02 g 0,02 g 0,1 g
Minimum weight for count-
ing parts 0,001 g 0,001 g 0,001 g
Reference quantity 10, 30, 50, 100 10, 30, 50, 100 10, 30, 50, 100
Reproducibility 0,001 g 0,001 g 0,001 g
Linearity ± 0,002 g ± 0,003 g ± 0,004 g
Adjusting weight internal internal internal
Stabilization time 3 sec. 3 sec. 3 sec.
Weighing plate stainless
steel Ø 118 mm Ø 118 mm Ø 118 mm
Weight kg (net) 2,0 2,0 2,0
Units,
verification switch in verifi-
cation position,(chap. 5.10) g, ct
Units ,
verification switch not in
verification position,
(chap. 5.10)
g, ct, oz, lb, ozt, dwt, GN, tl (HongKong), tl (Taiwan),
tl (Singapore, Malaysia), momme, tola
Air humidity max. 80 % relative (not condensing)
Permissible ambient
condition 10° C to 30° C
Balance dimensions 235 x 180 x 75 mm (excluding draft shield)
235 x 185 x 165 mm (including draft shield)
Vibratory filter 4
Mains supply
Mains adaptor 230 V, 50/60 Hz ;
9 V DC balance, 200 mA
Interface RS 232 C interfaced
Rechargeable battery optional
Underfloor weighing Hanging loop optional

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KERN EG 2200-2NM EG 4200-2NM EW 120-4NM
Readout 0,01 g 0,01 g 0,0002 g
Verification value (e) 0,1 g 0,1 g 0,001 g
Weighing range (max.) 2200 g 4200 g 120 g
Class of accuracy II II I
Taring range (subtractive) 2200 g 4200 g 120g
Minimum load (Min) 0,5 g 0,5 g 0,02 g
Minimum weight for counting
parts 0,01 g 0,01 g -
Reference quantity 10, 30, 50, 100 10, 30, 50, 100 -
Reproducibility 0,01 g 0,01 g 0,0002 g
Linearity ± 0, 02 g ± 0,02 g ± 0,0008 g
Adjusting weight internal internal -
Test weight, included - - 50 g (F1)
Recommended adjusting
weight, not included (class) - - 100g (E2)
Stabilization time 3 sec. 3 sec. 3 sec.
Weighing plate stainless steel 180 x 160 mm 180 x 160 mm Ø 80 mm
Weight kg (net) 3,7 3,7 2,4
Units,
verification switch in verification
position,(chap. 5.10) g, ct
Units ,
verification switch not in verifica-
tion position,
(chap. 5.10)
g, ct, oz, lb, ozt, dwt, GN, tl (HongKong), tl (Taiwan),
tl (Singapore, Malaysia), momme, tola
Air humidity max. 80 % relative (not condensing)
Permissible ambient condition 10° C to 30° C
Balance dimensions
including draft shield 195 x 251 x 254 mm
Balance dimensions
excluding draft shield 190 x 265 x 90 mm 180 x 235 x 75 mm
Vibratory filter 4
Mains supply
Mains adapter 230 V, 50/60 Hz ; 9 V DC balance,
200 mA
Interface RS 232 C interfaced
Rechargeable battery optional
Underfloor weighing Hanging loop optional

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KERN EW 220-3NM EW 420-3NM EW 620-3NM
Readout 0,001 g 0,001 g 0,001 g
Verification value (e) 0,01 g 0,01 g 0,01 g
Weighing range (max.) 220 g 420 g 620 g
Class of accuracy II II I
Taring range (subtractive) 220g 420 g 620 g
Minimum load (Min) 0,02 g 0,02 g 0,1 g
Minimum weight for count-
ing parts 0,001 g 0,001 g 0,001 g
Reference quantity 10, 30, 50, 100 10, 30, 50, 100 10, 30, 50, 100
Reproducibility 0,001 g 0,001 g 0,001 g
Linearity ± 0,002 g ± 0,003 g ± 0,004 g
Recommended adjusting
weight, not included (class)
200g (F1) 2 x 200g (E2) 500 g (E2)
Stabilization time 2 sec. 2 sec. 2 sec.
Weighing plate stainless
steel Ø 118 mm Ø 118 mm Ø 118 mm
Weight kg (net) 1,3 1,3 1,3
Units,
verification switch in verifi-
cation position,(chap. 5.10) g, ct
Units ,
verification switch not in
verification position,
(chap. 5.10)
g, ct, oz, lb, ozt, dwt, GN, tl (HongKong), tl (Taiwan),
tl (Singapore, Malaysia), momme, tola
Air humidity max. 80 % relative (not condensing)
Permissible ambient
condition 10° C to 30° C
Balance dimensions 235 x 180 x 75 mm (excluding draft shield)
235 x 185 x 165 mm (including draft shield)
Vibratory filter 4
Mains supply
Mains adaptor 230 V, 50/60 Hz ; 9 V DC balance,
200 mA
Interface RS 232 C interfaced
Rechargeable battery optional
Underfloor weighing Hanging loop optional

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KERN EW 820-2NM EW 2200-2NM EW 4200-2NM
Readout 0,01 g 0,01 g 0,01 g
Verification value (e) 0,01 g 0,1 g 0,1 g
Weighing range (max.) 820 g 2200 g 4200 g
Class of accuracy I II II
Taring range (subtractive) 820 g 2200 g 4200 g
Minimum load (Min) 1 g 0,5 g 0,5 g
Minimum weight for count-
ing parts 0,01 g 0,01 g 0,01 g
Reference quantity 10, 30, 50, 100 10, 30, 50, 100 10, 30, 50, 100
Reproducibility 0,01 g 0,01 g 0,01 g
Linearity ± 0,01 g ± 0,02 g ± 0,02 g
Recommended adjusting
weight, not included (class)
1 x 200 g
+ 1 x 500 g(F1) 2000 g (F1) 2 x 2 kg (E2)
Stabilization time 2 sec. 2 sec. 2 sec.
Weighing plate stainless
steel 170 x 142 mm 180 x 160 mm 180 x 160 mm
Weight kg (net) 1,3 2,8 2,8
Units,
verification switch in verifi-
cation position,(chap. 5.10) g, ct
Units ,
verification switch not in
verification position,
(chap. 5.10)
g, ct, oz, lb, ozt, dwt, GN, tl (HongKong), tl (Taiwan),
tl (Singapore, Malaysia), momme, tola
Air humidity max. 80 % relative (not condensing)
Permissible ambient
condition 10° C to 30° C
Balance dimensions
excluding draft shield 180 x 235 x 75 mm 190 x 265 x 90 mm
Vibratory filter 4
Mains supply
Mains adaptor 230 V, 50/60 Hz ; 9 V DC balance,
200 mA
Interface RS 232 C interfaced
Rechargeable battery optional
Underfloor weighing Hanging loop optional

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KERN EW 6200-2NM EW 12000-1NM
Readout 0,01 g 0,1 g
Verification value (e) 0,1 g 1 g
Weighing range (max.) 6 200 g 12 000 g
Class of accuracy I II
Taring range (subtractive) 6 200 g 12 000 g
Minimum load (Min) 1 g 5 g
Minimum weight for counting
parts 0,01 g 0,1 g
Reference quantity 10, 30, 50, 100 10, 30, 50, 100
Reproducibility 0,02 g 0,1 g
Linearity ± 0, 03 g ± 0,1 g
Recommended adjusting
weight, not included (class) 5 kg (E2) 10 kg (F1)
Stabilization time 3 sec. 3 sec.
Weight kg (net) 2,8 2,8
Units,
verification switch in verifica-
tion position,(chap. 5.10) g, ct
Units ,
verification switch not in veri-
fication position,
(chap. 5.10)
g, ct, oz, lb, ozt, dwt, GN, tl (HongKong), tl (Taiwan),
tl (Singapore, Malaysia), momme, tola
Air humidity max. 80 % relative (not condensing)
Permissible ambient
condition 10° C to 30° C
Weighing plate stainless steel
180 x 160 mm
Balance dimensions 190 x 265 x 90 mm (excluding draft shield)
Vibratory filter 4
Mains supply
Mains adapter 230 V, 50/60 Hz ; 9 V DC balance,
200 mA
Interface RS 232 C interfaced
Rechargeable battery optional
Underfloor weighing Hanging loop optional

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KERN EWB 220-2M EWB 620-2M EWB 1200-1M
Readout 0,01 g 0,01 g 0,1 g
Verification value (e) 0,01 g 0,1 g 0,1 g
Weighing range (max.) 220 g 620 g 1 200 g
Class of accuracy II II II
Taring range (subtractive) 220 g 620 g 1 200 g
Minimum load (Min) 0,2 g 0,5 g 5 g
Minimum weight for
counting parts 0,01 g 0,01 g 0,1 g
Reference quantity 10, 30, 50, 100 10, 30, 50, 100 10, 30, 50, 100
Reproducibility 0,01 g 0,01 g 0,1 g
Linearity ± 0,01 g ± 0,01 g ± 0,1 g
Recommended adjusting
weight, not included
(class) 200 g (M1) 500 g (F2) 1 000 g (M1)
Stabilization time 2 sec 2 sec 3 sec
Weight kg (net) 1,1 1,1 1,3
Units,
verification switch in veri-
fication position,(chap.
5.10) g, ct
Units ,
verification switch not in
verification position,
(chap. 5.10)
g, ct, oz, lb, ozt, dwt, tl (HongKong),
tl (Taiwan), tl (Singapore, Malaysia), momme, tola
Air humidity max. 80 % relative (not condensing)
Permissible ambient
condition 10° C bis 30° C
Weighing plate stainless
steel ø 140 mm 170 x 140
Balance dimensions 182 x 235 x 75 mm
Vibratory filter 4
Mains supply Mains adapter 230 V, 50/60 Hz ; 9 V DC balance, 300 mA
Rechargeable battery optional
Underfloor weighing Hanging loop optional

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1.1 Read-off of the various weighing units
Weighing unit EW 120-4NM EG 220-3NM /
EW 220-3NM
EG 420-3NM /
EW 420-3NM
g
0.0002
0.001
0.001
(ct)
0.001
0.01
0.01
(oz)
0.00001
0.0001
0.0001
(lb)
0.00001
0.00001
0.00001
(ozt)
0.00001
0.0001
0.0001
(dwt)
0.0002
0.001
0.001
(grain)
0.01
0.1
0.1
(Hong Kong)
0.00001
0.0001
0.0001
(Singapore,Malaysia)
0.00001
0.0001
0.0001
(Taiwan)
0.00001
0.0001
0.0001
mom
0.0001
0.001
0.001
(to)
0.00002
0.0001
0.0001
Weighing unit EG 620-3NM /
EW 620-3NM
EW 820-2NM EG 2200-2NM/
EW 2200-2NM
g
0.001
0.01
0.01
(ct)
0.01
0.05
0.1
(oz)
0.0001
0.0005
0.001
(lb)
0.00001
0.00005
0.0001
(ozt)
0.0001
0.0005
0.001
(dwt)
0.001
0.01
0.01
(Hong Kong)
0.1
0.0005
0.001
(Singapore,Malaysia)
0.0001
0.0005
0.001
(Taiwan)
0.0001
0.0005
0.001
mom
0.0001
0.005
0.01
(to)
0.001
0.001
0.001
0.0001
Weighing unit EG 4200-2NM/
EW 4200-2NM
EW 6200-2NM EW 12000-1NM
g
0.01
0.01
0.1
(ct)
0.1
0.1
1
(oz)
0.001
0.001
0.01
(lb)
0.0001
0.0001
0.001
(ozt)
0.001
0.001
0.01
(dwt)
0.01
0.01
0.1
(Hong Kong)
0.001
0.001
0.01
(Singapore,Malaysia)
0.001
0.001
0.01
(Taiwan)
0.001
0.001
0.01
mom
0.01
0.01
0.1
(to)
0.001
0.001
0.01

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Weighing unit EWB 220-2M EWB 620-2M EWB 1200-1M
g
0.01
0.01
0.1
(ct)
0.1
0.1
1
(oz)
0.001
0.001
0.01
(lb)
0.0001
0.0001
0.001
(ozt)
0.001
0.001
0.01
(dwt)
0.01
0.01
0.1
(Hong Kong)
0.001
0.001
0.01
(Singapore,Malaysia)
0.001
0.001
0.01
(Taiwan)
0.001
0.001
0.01
mom
0.01
0.01
0.1
(to)
0.001
0.001
0.01
1.2 Weighing unit conversion charts
Weighing unit Gramm Carat Ounze Pound Fine
ounze
Penny weight
1g 1 5 0.03527 0.00220 0.03215 0.64301
1ct 0.2 1 0.00705 0.00044 0.00643 0.12860
1oz 28.34952 141.74762 1 0.06250 0.91146 18.22917
1lb
453.59237
2267.96185
16
1
14.58333
291.66667
1ozt
31.10348
155.51738
1.09714
0.06857
1
20
1dwt
1.55517
7.77587
0.05486
0.00343
0.05
1
1GN
0.06480
0.32399
0.00229
0.00014
0.00208
0.04167
1tl (HK)
37.429
187.145
1.32027
0.08252
1.20337
24.06741
1tl (SGP,Mal)
37.79936
188.99682
1.33333
0.08333
1.21528
24.30556
1tl (Taiwan)
37.5
187.5
1.32277
0.08267
1.20565
24.11306
1mom
3.75
18.75
0.13228
0.00827
0.12057
2.41131
1to
11.66380
58.31902
0.41143
0.02571
0.37500
7.5
Weighing unit
Grain
Tael
(Hong Kong)
Tael
(Singapore,
Malaysia)
Tael
(Taiwan)
Momme
Tola
1g
15.43236
0.02672
0.02646
0.02667
0.26667
0.08574
1ct
3.08647
0.00534
0.00529
0.00533
0.05333
0.01715
1oz
437.5
0.75742
0.75
0.75599
7.55987
2.43056
1lb
7000
12.11874
12
12.09580
120.95797
38.88889
1ozt
480
0.83100
0.82286
0.82943
8.29426
2.66667
1dwt
24
0.04155
0.04114
0.04147
0.41471
0.13333
1GN
1
0.00173
0.00171
0.00173
0.01728
0.00556
1tl (HK)
577.61774
1
0.99020
0.99811
9.98107
3.20899
1tl (SGP,Mal)
583.33333
1.00990
1
1.00798
10.07983
3.24074
1tl (Taiwan)
578.71344
1.00190
0.99208
1
10
3.21507
1mom 57.87134 0.10019 0.09921 0.1 1 0.32151
1to 180 0.31162 0.30857 0.31103 3.11035 1

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2 Fundamental information (general)
2.1 Intended use
The balance you have acquired serves to determine the weighing value of the mate-
rial 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. The weighing value can be read off after a stable weighing value has been
obtained.
2.2 Inappropriate use
Do not use the 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 drain-
ing fluids from a container on the balance.)
Do not leave a permanent load on the weighing plate. This can damage the measur-
ing equipment.
Be sure to avoid impact shock and overloading the balance in excess of the pre-
scribed maximum load rating (max.), minus any possible tare weight that is already
present. This could cause damage to the balance.
Never operate the balance in hazardous locations. The series design is not explo-
sion-proof.
Structural alterations may not be made to the balance. This can lead to incorrect
weighing results, faults concerning safety regulations as well as to destruction of the
balance.
The balance may only be used in compliance with the described guidelines. Varying
areas of application/planned use must be approved by KERN in writing.
2.3 Guarantee
The guarantee is not valid following
- non-observation of our guidelines in the operating instructions
- use outside the described applications
- alteration to or opening of the device
- mechanical damage and damage caused by media, liquids
- natural wear and tear
- inappropriate erection or electric installation
- overloading of the measuring equipment

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2.4 Monitoring the test substances
The metrology features of the balance and any possible available adjusting weight
must be checked at regular intervals within the scope of quality assurance. For this
purpose, the answerable user must define a suitable interval as well as the nature
and scope of this check. 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. Test weights and balances can be adjusted quickly and at
a reasonable price in KERN’s accredited DKD calibration laboratory (return to na-
tional normal).
3 Fundamental safety information
3.1 Observe the information in the operating instructions
Please read the operating instructions carefully before erecting and commissioning,
even if you already have experience with KERN balances.
3.2 Staff training
The device may only be operated and looked after by trained members of staff.
4 Transport and storage
4.1 Acceptance check
Please check the packaging immediately upon delivery and the device during un-
packing for any visible signs of external damage.
4.2 Packaging / return transport
Keep all parts of the original packaging for a possibly required re-
turn.
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 plat-
form, power unit etc. against shifting and damage.

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5 Unpacking, installation and commissioning
5.1 Place of installation, place of use
The balance is constructed in such a way that reliable weighing results can be
achieved under normal application conditions.
By selecting the correct location for your balance, you will be able to work quickly
and precisely.
Therefore please observe the following at the place of installation:
- 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. In-
admissible bedewing (condensation of air moisture on the device) can occur if
a cold device is taken into a significantly warmer environment. In this case,
please acclimatise the device for approx. 2 hours at room temperature after it
has been disconnected from the mains.
- Avoid static charging of the material to be weighed, weighing container and
windshield.
Major display deviations (incorrect weighing results) are possible if electromagnetic
fields occur as well as due to static charging and instable power supply. It is then
necessary to change the location.

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5.2 Unpacking
Carefully remove the balance from its packaging, remove the plastic wrapping and
position the balance in its intended working location.
5.2.1 Installation
Use the foot screws to level the balance until the air bubble in the bubble level is in
the prescribed circle.
5.2.2 List of items supplied
Standard accessories:
(1) Balance
(2) Weighing plate
(3) Weighing plate bracket
(4) Windbreak
(excl. EWB models)
(5) Interface connector set
(excl. EWB models)
(6) Operating instructions
(7) Mains adaptor

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5.2.3 Positioning the weighing plate
Screw the bracket on tightly according to
the drawing and subsequently attach the
weighing plate.
5.2.4 Serial draft shield installation
(Only for models with readout d = 0,001 g standard)

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5.2.5 Draft shield installation – optional
Remove the weighing plate and loosen the screws to remove the bracket. Use a
screwdriver to loosen both screws to the left and right of the bracket guide and re-
move.
Now place the draft shield to fit on the housing and and secure through the opened
sliding doors using both screws.
Screw the bracket on tightly according to the drawing and subsequently attach the
weighing plate.
5.2.6 Draft shield with glass sliding doors
(only model KERN EW 120-4NM standard)

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5.3 Mains supply
Electric power supply is by means of the external mains supply circuit. The printed
voltage level must comply with the local voltage.
Only use original KERN mains supply circuits. The use of other makes is subject to
approval by KERN.
Mains adaptor connection:
5.4 Operation using a rechargeable battery (optional)
Take off the weighing plate and remove the bracket by loosening the screw. Use a
screwdriver to loosen both screws to the left and right of the bracket guide and re-
move.
Release both retaining hooks on the lower housing section and carefully remove the
lower housing section to the rear (please observe the upper housing section guides
on the back of the balance).
Loosen and remove both fastening screws as shown on the illustration.
Remove the rechargeable battery from the packaging and begin by connecting the
electric power supply to the circuit board of the rechargeable battery.
Subsequently set up the plug-in connection to the computer circuit board of the bal-
ance (CN5).
The rechargeable battery is placed on the left side of the housing in such a way that
it can be screwed onto the balance through the existing mounting using the screw
loosened previously. Press lightly into the housing prior to this, (there is only one cor-
rect installation possibility). Now also re-attach the display using the loosened screw.
Place the upper housing section on the rear guides and tilt forward until both retain-
ing hooks on the lower housing section audibly lock into place.
Screw down both screws to the left and right of the bracket guide tightly and re-
secure the bracket. Attach the weighing plate.
Information:
Though the rechargeable battery is immediately operative, it should be charged for at
least 8 hours using the mains adaptor before being used for the first time.
Mains adaptor
connection

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5.5 Connecting peripheral equipment
The balance must be disconnected from the mains before connecting or disconnect-
ing additional equipment (printer, PC) to or from the data interface (see chap. 8.)
Only use KERN accessories and peripheral equipment with your balance. These
have been ideally coordinated to your balance.
5.6 Initial start-up
A warm-up time of 10 minutes stabilises the measured values after switching on.
The accuracy of the balance depends on the local acceleration of the fall.
Please be sure to observe the information in the chapter on adjusting (chap. 5.7).
5.6.1 Power display
If the (*) sign can be seen, the balance is being
supplied with power via the mains adaptor. The
balance is in weighing mode when the key is
operated.
The power display is then no longer to be seen
on the display overview.
5.6.2 Bar graph display
weighing dish unloaded half of weighing range weighing range is used
to full capacity
The weighing range of the balance is divided into 20 graphic cuboids. Zero (0) will
appear on the graphic display if there is no weighing value on the balance. 10 graph-
ic cuboids are displayed if the balance is loaded up to one half of its weighing range.
Information:
If tare weighing is being carried out, the graphic weight display will continue to indi-
cate the number of cuboids of the tare weight.
*

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5.6.3 Stability indication
Stable
Unstable
The balance is in a stable condition if the [ο] stability indication appears on the dis-
play. The [ο] indication disappears if the condition is unstable. Stable ambient condi-
tions can be achieved by using the draft shield (See chap. 5.2.4 for installation)
5.6.4 Zero display on the balance
Environmental influences can lead to the exact figure of “0.000“ not being displayed
in spite of an empty weighing dish. It is, however, possible to reset your balance to
zero at any time and thus ensure that weighing really does commence at zero. Set-
ting to zero when a weight is applied is only possible within a certain type-dependent
range. In the event that the balance cannot be reset to zero with an applied weight,
this range has been exceeded.
[o - Err ] will appear on the display.
Operation Display
If an exact zero reading is not displayed on
the balance in spite of the weighing dish be-
ing empty, press the key and the balance
will start resetting to zero.
Your balance will be set to zero after a short
standby time.
In addition to this, the sign for the balance
zero setting will be displayed [
→
0
←
].
ο
0 I I I F
0.000
g
0 I I I F
0.000 g
→0←0 I I I F
0.000
g