KERN 470 Series User manual

470-BA-defs-0017 31
E KERN 470
Version 1.7 05/2000
Operating Instructions
Electronic Precision Balances
1 TECHNICAL DATA.............................................................................................. 33
2 UNPACKING AND STANDARD EQUIPMENT.................................................... 33
3 INSTALLATION.................................................................................................... 34
4 POWER MAINS CONNECTION........................................................................... 34
5 DECLARATION OF CONFORMITY..................................................................... 35
6 SELECTION OF THE MODE SETTING............................................................... 37
6.1 Mode setting „Weighing“......................................................................................................................37
6.1.1 Weighing..........................................................................................................................................37
6.1.2 Taring TARE ...................................................................................................................................38
6.1.3 Bar graph display when weighing...................................................................................................38
6.1.4 Net-total-weighings..........................................................................................................................38
6.2 Mode „parts counting“...........................................................................................................................39
6.3 Mode „percent“ ......................................................................................................................................40
6.3.1 Input of the 100%-reference weight by weighing...........................................................................40
6.3.2 Input of the reference weight using the keyboard..........................................................................42
6.4 Mode „weighing and conversion“ .........................................................................................................42
7 WEIGHING WITH TOLERANCE RANGE (CHECK WEIGHER).......................... 43
7.1 Input of the limiting values by weighing (see point 6.1 „Mode weighing”) ......................................43
7.2 Input of the limiting values using the keyboard...................................................................................44
7.3 Deletion of the limiting values ...............................................................................................................44
8 ACCUMULATION OF DISPLAYED VALUES...................................................... 45
8.1 Accumulation of all individual weighings.............................................................................................45
8.2 Net-total weighing...................................................................................................................................46
9 ADJUSTING (CALIBRATION)............................................................................. 47
9.1 Introduction ............................................................................................................................................47
9.2 Adjusting for verification.......................................................................................................................48
9.2.1 General.............................................................................................................................................48
9.2.2 Disable/enable the adjustment function..........................................................................................48
10 GENERAL PROGRAMMATIONS ..................................................................... 49
11 ACCUMULATOR OPERATION (OPTIONAL)................................................... 53
11.1 Technical data:........................................................................................................................................53
11.2 Assembling instructions.........................................................................................................................53
12 DATA OUTPUT................................................................................................. 55

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12.1 Description of the serial data output (similar to RS 232)....................................................................55
12.2 Setting of the interface ...........................................................................................................................57
12.3 Additional technical data.......................................................................................................................57
13 IMPORTANT INFORMATION ........................................................................... 58
14 TROUBLE SHOOTING ..................................................................................... 59
14.1 Error messages........................................................................................................................................59

470-BA-defs-0017 33
1 Technical Data
Model KERN 470-36 470-38 470-44 470-46
Readout (d)
Readout (d) verifiable
Readout (d) verified
Verification value (e)
g
g
g
g
0,01
0,1
0,02
0,1
1
0,05
0,1
1
0,1
1
Weighing range (max)
Minimum load (min)
g
g
2000
0,5
5000
5
10000
5
15000
5
Reproducibility
Linearity
g
g
0,01
±0,02
0,02
±0,04
0,05
±0,1
0,1
±0,2
Minimum weight for
counting parts g 0,05 0,1 0,25 0,5
Adjusting weight
(accuracy class F2) g 1000 2000 5000 1000 + 5000
Weighing plate steel Ø 170 220 x 180
Power mains connection Mains adapter 230 V, 50/60 Hz
Balance 9 V DC
Humidity Max. 80 % relative (non evaporating)
Ambient temperature 0 °C to + 40 °C
Underfloor weighing Hanging loop below the cover plate as standard
2 Unpacking and standard equipment
Unpack the balance carefully. Keep the packing material for an eventual later transport
of the balance.
The packing contains:
•Balance
•Weighing plate
•Weighing plate support
•Mains adaptor
•Adjusting weight
•Operating instructions

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34
3 Installation
Loosen the transport locking. For that remove the black rubber cap at the top of the
casing and turn the lever below to the left side in „Weighing pos“.
•See also the relevant labels.
•Insert rubber cap again
•Screw on the weighing plate support with the knurled screw. Pay attention to the
fitting holen.
•Insert weighing plate.
•Place the balance on a horizontal stable base, see point 12 „Important
informations“.
•Level the balance with the foot screws. The air bubble (in the front of the balance at
the left side) must be in the marked circle.
Important!
For each transport of the balance the transport locking
must be in position „Transportation pos.“.
4 Power mains connection
Ensure that the mains adapter will be connect to a wall socket. Do not connect to
another mains voltage, unless the type label indicates another voltage.
The wall socket must be earthed as per the VDE prescriptions. Checking by an
authorised special electric workshop.
•Connect adapter cable at the rear side of the balance.
Only now:
•Plug the supplied mains adapter into the wall socket.
•Adjusting the balance, see point 9 „Adjusting“.

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5 Declaration of conformity
Declaration of conformity
The non-automatic balances
Type: KERN 470-36
KERN 470-38
KERN 470-44
KERN 470-46
No. of the EC type-approval certificate: T2560
Issued by: NMI
correspond to the production model described in the EC type-approval certificate
and to the requirements of the following EC directives:
EC-Directive Version 90/384/ECC
Applied harmonised norms, in particular
EN 45501
This declaration is only valid with the certificate of conformity by a notified
body.
If a change is made to the above mentioned appliances without consulting KERN
this declaration will become invalid.
Date: 27 April 2000 Signature: Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen-Frommern, Tel. [phone],Fax [phone]

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36
Declaration of conformity
The non-automatic balances
Type: KERN 470-36
KERN 470-38
KERN 470-44
KERN 470-46
correspond to the production model described in the EC type-approval certificate
and to the requirements of the following EC directives:
EC EMC Directive Version 89/336/ECC
Applied harmonised norms, in particular
EN 50081-1, EN 50082-1, EN 55022
If a change is made to the above mentioned appliances without consulting KERN
this declaration will become invalid.
Date: 27 April 2000 Signature: Gottl. KERN & Sohn GmbH
Management
Gottl. KERN & Sohn GmbH, Ziegelei 1, D-72336 Balingen-Frommern, Tel. [phone],Fax [phone]

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6 Selection of the mode setting
There are four mode settings::
Mode settings Indication Page
6.1 Weighing 1 SEt 1* 37
6.2 Weighing and parts counting 1 SEt 2 39
6.3 Weighing and percent 1 SEt 3 40
6.4 Weighing and conversion 1 Set 4 42
•Manufacturer’s default.
The mode setting is kept even when the balance will be turned off.
In each mode setting weighing, pieces and percent presets with tolerance range are
possible point 7 „Weighing with tolerance range“.
In each mode setting accumulations of weight values, pieces and percent values are
possible , see pint 9 “Accumulation of indicated values“.
6.1 Mode setting „Weighing“
Setting see point 10 „General programmations“ on mode setting „1 Set 1“.
6.1.1 Weighing
Turn on the balance with the switch at the bottom of the right side of the casing. All
segments and signs will appear in the display in the frame of the self-controlling.
Then the indication changes to 0. Now the balance is ready for use.
To secure the accuracy we recommend a warming-up time of minimum 15 minutes.
Only now (!) place the weighing object on the weighing plate. Take care that the
weighing object does not touch anywhere at the casing or at the base.
The weight determination is finished when the small ring o (=stability detector)
appears in the left upper corner of the display.
Read the weighing result.

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The indication of a weight unit, i.e. „g“ can be changed to another unit, e.g. 2kg“ by
repeatedly pressing F.
Setting unit see point 10 „General programmations“:
Weighing with tolerance range, see point 7.
Weighing with accumulation, see point 8.
6.1.2 Taring TARE
Place tare cup on the weighing plate and press TARE.
The weighing indication changes now to 0. The weight of the cup is now memorised.
Fill weighing object in the cup, read measuring value.
By pressing TARE, after the terminated weighing operation 0appears again in
the display.
The taring procedure can be repeated several times, for instance to produce a mixture
of several components.
The limit is reached when the total weighing range has been used.
After removal of the tare cup the total weight appears as a negative value with „-„
mark.
6.1.3 Bar graph display when weighing
Will be activate with weight unit „B“ is active on the display. This is available by F. See
point 6.1.1 „Weighing“.
The bar graph (below the digital display) moves from the left to the right side and
mar5ches in the same measure as the balance is being loaded. Is full breadth will be
reached at full capacity.
This is to display analogously the actual remaining weighing range and to avoid an
overloading.
6.1.4 Net-total-weighings
Useful when a mixture of several components will be weighed in a tare cup, and when
finally the sum weight of all components will be needed for control (Net-total), i.e.
without the weight of the tare cup.
See point 8 „Accumulation of indicated values“, point 8.2 „Net-total-weighings“

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6.2 Mode „parts counting“
Set mode „parts counting“ with Fand TARE on „1 Set 2“,, see point 10 „General
programmations
Confirm with S.
Press Fand release it when „U SEt“ appears.
Now flashing indication on.....PC %
Select the required reference number →5 →10 →30 →100 pieces by repeatedly
pressing TARE.
Important!
The higher the reference number,
the exacter the parts counting.
Place so much parts on the weighing plate as the set reference number requires.
Confirm with F, the memorising will need a short time. Now this reference number
appears.
When the display is flashing an optimisation will be possible. At the same time two
triangles appear at the left side.
Now double or max. triple approximately the quantity. The following optimisation is
running automatically. It is finished when a beep comes out. No confirm required.
When the display is still flashing and shows Add , at the right side a new optimi-
Sation should be performed by doubling or max. tripling the quantity, same procedure
as above.
When Sub PC 5 , appears remove so much parts from the weighing plate until
this display will disappear.
Press Fwhen the optimisation should be terminated.
Now the balance is ready for counting and will count all parts being on the weighing
plate.
Indication of the unit weight of one part as well as the total weight in „g“ of all parts on
the weighing plate to be counted by repeated pressing of F.
Now parts counting by over-writing the reference number. Press Fand release it when
U SEt appears.
Minimum weight for counting parts see table „Technical data“
L - Err Appears when the unit weight of the parts is below the minimum weight
as specified.

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Tare cups can also be used when counting parts. Before starting tare it with TARE.
Leave the parts counting program by pressing F. Release it Func an then
when 1 SEt 2 appears.
Further see point 11 „General programmations“.
The last memorised reference number is kept even when the „parts counting“ program
will be left.
Parts counting with tolerance range, see point 8.
Accumulation of numbers of pieces, see point 9.
6.3 Mode „percent“
Any weight can be memorised as a reference weight 100 %. All deviations of this
weight will be indicated in %.
Example: Reference weight prior to drying 100 g,
after drying 80 g
Indication either 80 % absolute
or after taring 20 % relative.
Set mode „percent“ with Fand TARE on 1 SET 3 See point 10 „ General
programmations“.
Confirm with S.
Important!
The higher the reference weight 100 %
the more decimal places.
6.3.1 Input of the 100%-reference weight by weighing.
Press Fand release it when P SEt appears.
Now flashing display of the actually memorised reference weight corresponding to 100
%.
Place new 100 % reference weight on the weighing plate.
Confirm with F, the memorising will need a short time. Now 100, ..... % appears.
Now the balance displays each deviation from the 100 % reference weight in %
absolute.
By taring after having memorised the reference weight 100 % the balance will display
in % relative.

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Indication of the actual weight value on the weighing plate by pressing Ftwice.
Return to the % display by pressing F.
Tare cups/container can also be used for percent determinations. Before starting tare
them with TARE.
Percent determination with tolerance range see point 7 „Weighing with tolerance
range“.
To leave the mode „percent“ press Fand release it when Func and then
1 SEt 3 appears.
Further see point 10 „General programmations“.
The last memorised 100 % reference weight is kept even when the mode „percent“ will
be left.

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6.3.2 Input of the reference weight using the keyboard.
Press Fand release it when P. SEt Appears,
Now flashing display of the actual memorised reference weight corresponding to 100 %.
Example: Press TARE,0starts to flash.
Input 3By pressing three times TARE, move it with f by
one place
to the left, indication flashing 30 .
Input 2by pressing twice TARE, move it with Fby one place to the
left, indication flashing 320 .
Input 1by pressing TARE and move it with Fby
One place to the left, indication flashing 3210 .
Input !By pressing repeatedly TARE and move it with Fby one
Place to the left, indication flashing 321.0 .
Input 5By pressing repeatedly TARE. Do not operate the F-key!
Confirm with S the 100 % reference weight of 321.5 g
Display 0,0 % .
Further see point 6.3.1
6.4 Mode „weighing and conversion“
Serves to multiply the weight in „g“ of a weighing object on the weighing plate by a
factor. The following procedures can be performed automatically.
!Conversions to foreign weight units
!Conversions to complex units such as density (g/cm³), area weights (g/cm³)
or length weight (g/m)
!Conversions to works-internal arithmetical units, for instance works
standards
This factor can be as well as greater or smaller than 0. Positive and negative numbers
can also be memorised.
Set to 1 SEt 4 With Fand TARE, see point 10 „General programmations“.
TO SET THE CONVERSION FACTOR SEE POINT 6.3.2 „INPUT OF THE
REFERENCE WEIGHT USING THE KEYBOARD“
Input firstly the sign, then the figures before the decimal point, the decimal point,
and finally the figures after the decimal point.
Delete the conversion factor by new input of a conversion factor of „0“, then confirm
with S. Display 0, the memory is deleted.

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7 Weighing with tolerance range (Check weigher).
This balance can be used as dispensing balance as well as grading balance. The
respective lower and upper limiting values can be memorised.
This is possible in all four modes:
6.1 WEIGHING
6.2 Weighing and parts counting
6.3 Weighing and percent
6.4 Weighing and conversion
For 6.2 up to 6.4 firstly the starting extents have to be set, i.e. the reference number,
100 % reference weight and conversion factor, the limiting values in the sense of point
7.1 „Input of the limiting values by weighing“.
Important!
Input always firstly the lower limiting value,
only then input the upper limiting value.
7.1 Input of the limiting values by weighing (see point 6.1 „Mode weighing”)
Press S and release it when L. SEt appears.
Now flashing display of either 0or of the actual memorised lower limiting value.
Put the lower (i.e. the smaller) limiting value on the weighing plate.
Confirm with F, the memorising will need a short time. Now 0appears again
flashing.
Put the upper (i.e. the greater) limiting value on the weighing plate.
Confirm with Fand wait for the beep.
Now both limiting values are memorised.
When the succeeding weighings will be within the tolerance range, i.e. between the lower
and the upper limiting value, an acoustic sign will optionally come out. The acoustic sign
stops when the tolerance range has been left. (More options for weighing with tolerance
range see 10 „General programmations“.)

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Important!
In case the balance should be unstable in the range of the limiting points,
the vibration filter should be turned less sensitive, see point 10 „General
programmations“.
7.2 Input of the limiting values using the keyboard
Press Sand release it when L. SEt appears.
Now flashing display of either 0or of the actual memorised lower limiting value.
Press TARE,0start to flash. Further see point 6.4.2 „Input of the reference
weight, using the keyboard“ with example 321,5 g i.e. lower limiting value.
After having confirmed the lower limiting value with S0will appear flashing,
or the memorised upper limiting value.
Press TARE, 0starts to flash.
Input the upper limiting value as explained above and confirm with S.
Weighing with tolerance range see point 7.1.
7.3 Deletion of the limiting values
Press Sand release it when L. SEt appears
Now flashing display of the actual memorized lower limiting value.
Press TARE,0Starts to flash. Confirm with S, the lower limiting value is
deleted.
Now the upper limiting value appears flashing.
Press TARE,0starts to flash. Confirm with S, the upper limiting value is deleted.
The limiting points can also be changed by over-writing.
Important:
Limiting values have to be deleted in order
to return to the weighing mode.

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8 Accumulation of displayed values
The sum of all individual weighings during one period can be memorised in a separate
store, for example the total daily sum of all weighings during this day.
This is possible in all four modes:
6.1 WEIGHING
6.2 Weighing and parts counting
6.3 Weighing and percent
6.4 Weighing and conversion
Before starting set always the smallest possible display-unit.
Example: In the mode „Weighing2 see point 6.1 set „g“ and not „kg“.
8.1 Accumulation of all individual weighings
Carry out weighing A, for example 1000 g.
After the light up of the stability detector o
(left side above in the display), the indicated value will be transferred to the sum
memory by pressing S.
The display goes for a moment to the sum weight Σ
ΣΣ
Σ
1000 g ,then to 1000 g .
Remove weighing object.
Carry out weighing B, for example 500 g. See above.
See above.
Indication after having pressed Sfirstly sum weight Σ
ΣΣ
Σ
1000 g
then 500 g .
Remove weighing object.
Carry out weighing C, for example 200 g.
See above.
Indication after having pressed Sfirstly sum weight Σ
ΣΣ
Σ
1700 g
then 200 g .
Remove weighing object.
After having carried out the last individual weighing the total sum of all weighings A +
B + C appears by pressing twice F.
For example Σ
ΣΣ
Σ
1700 g (1000 + 500 + 200 g)
Delete with TARE.
Return to the mode „weighing“ with F.

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8.2 Net-total weighing
Useful when a mixture of several components will be weighed in a tare cup, and when
finally the sum weight of all components will be needed for control (Net-total), i.e.
without the weight of the tare cup. Place the tare cup (for example 852 g) on the
weighing plate.
Tare the display with TARE to 0.
Weigh in component I, for example 600 g-
After termination of the weighing in and the light up of the stability detector o
(left side above in the display) the indicated value will be transferred to the sum
memory by pressing S.
Σ
ΣΣ
Σ
600 g 600 g
Indication for a moment the sum weight , then
Tare to 0with TARE.
Weigh in component III, for example 100 g
See above.
Indication after having pressed Sfirstly sum weight Σ
ΣΣ
Σ
1000 g
then 400 g .
Tare to 0with TARE.
Weigh in component III, for example 100 g
See above.
Indication after having pressed Sfirstly sum weight Σ
ΣΣ
Σ
1100 g
then 100 g .
After having terminated the weighing in of the individual components to the required
mixture the sum weight of all weighings I + II + III appears by pressing twice F,
for example Σ
ΣΣ
Σ
1100 g (600 + 400 + 100 g)
This is an important end control for the dispensing.
The weight of the tare cup (852 g in the example is not included in the sum weight of
the components I + II + III.
Delete with TARE.
Return to the mode „weighing“ with F.

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9 Adjusting (Calibration)
9.1 Introduction
The accuracy of the balance can be checked and adjusted at any time with the
enclosed adjusting weight.
Take care of stable environmental conditions, see point 12 „Important informations“.
A warming up time of approx. 30 minutes is necessary.
Press and hold Fand only release it when CAL appears.
Press and hold T. the immediately touch F for a moment, then also release T.
Display Unit 1 (Unit 2)
Touch Ffor a moment. Display on 0 flashing.
Don’t touch the weighing plate. Briefly after that appears on F5 in the display.
Place the adjusting weight carefully on the centre of the weighing plate.
Display flashing on F.5 then a moment later the weight value of the adjusting
weight will be indicated.
Remove the adjusting weight, the adjusting is terminated.
In case of a adjusting error or in order to interrupt the adjusting process get out with S.
Keep the calibration weight near the balance for daily checking is accuracy.
Important!
Handle carefully the adjusting weight. Protect it against damage and dirt.
Arrange for periodic checking. Keep it near the balance (danger of
confusion).

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9.2 Adjusting for verification
9.2.1 General
Before the verification procedure, the balance must be adjusted where it is to be used.
The commutation of the readout, to 01 g for the verifiable balances 470-38
and 470-44.
The balances have the following standard settings:
KERN 470-38 470-44
Readout (d) 0,02 g 0,05 g
The readout has to be modified for the verification as follows:
Press Fand release it when Func appears.
Then 1 Set. 1 appears.
By pressing repeatedly Fstart the function 72.d.A 1 of.
Model 470-38: Press TARE and release it when 72.d.A 3 appears
(Division 0,1 g). 74.d.A 3
Model 470-44: Press TARE and release it when 72.d.A 2 appears
(Division 0,1 g) 74-d.b 2
Confirm with Sand leave the programming mode.
9.2.2 Disable/enable the adjustment function
Remark: An adjustment is only possible if this has not been disabled by the
adjustment switch.
Switch up: Adjustment function is possible.
Switch down: Adjustment function is disabled. Jafter the succesful
adjustment where the balance is being used,
adjustment must be disabled with this switch
position.

470-BA-defs-0017 49
10 General programmations
The manufacturer has set a certain default configuration. This marked with *.
It can be changed as follows:
Press Ffor approx. 4 seconds, release when Func Appears.
Upon release 1 SEt 1 appears.
The various functions will be called up by pressing Frepeatedly.
The individual setting within the various functions will be called up by pressing TARE
repeatedly.
The following adaptations are possible:
The following adaptations are possible:
FT
Weighing 1Set.1* See point 6.1
Weighing and parts
counting ↓
↓↓
↓2See point 6.2
Weighing in percent ↓
↓↓
↓3See point 6.3
Weighing and
conversion ↓
↓↓
↓4See point 6.4
2 SE1. 4* Use always this setting
↓
↓↓
↓1,2,3 Not documented
Follow at zero adjust
3A.O

470-BA-defs-0017
50
FT
Settings 21.Co. up to 25.G
Are relevant for weighings with tolerance range only
Sound signal 21. Co. 1 Sounds immediately even when the
stability detector
↓
↓↓
↓2Sounds only when the stability
detector is indicated.
Sound signal 22. L1. 0 Sounds only outside the zero point
range.
↓
↓↓
↓1Sounds in all ranges
23 P.u. 2 Use always this setting.
↓
↓↓
↓1,3,4 Not documented.
Options of the sound
signal 24 Bu. 0* No sound
↓
↓↓
↓1Not documented
↓
↓↓
↓2Sounds when the measuring value
is within the tolerance range.
↓
↓↓
↓3,4,5 Not documented.
6Sounds when the measuring value
is outside the tolerance range.
Additional
representation in the
display
25 L.G. 1* Representation of 3 additions below,
above and within the tolerance
range.
↓
↓↓
↓2Continuos representation of the
charged weight regarding the
tolerance range.