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KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
email: info@kern-sohn.com
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating instructions
Personal scales
KERN MPU
Version 1.1
01/2010
GB
MPU-BA-e-1011
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GB
KERN MPU
Version 1.1 01/2010
Operating instructions for personal scales
Table of Contents
1 Technical Data ............................................................................................... 3
2 Appliance overview ....................................................................................... 4
3 Basic Information (General).......................................................................... 5
4 Basic Safety Precautions.............................................................................. 7
5 Transportation & Storage.............................................................................. 7
6 Unpacking, Setup and Commissioning ....................................................... 8
6.1 Installation............................................................................................................................... 10
7 Operation...................................................................................................... 12
8 Adjustment................................................................................................... 15
9 BMI trend display......................................................................................... 20
10 Data output................................................................................................... 21
11 Printer mode................................................................................................. 22
11.1 Printout example .................................................................................................................... 22
11.2 Setting automatic printed edition......................................................................................... 22
11.3 Setting manual data output................................................................................................... 24
12 Error messages............................................................................................ 25
13 Service, maintenance, disposal.................................................................. 26
14 Instant help................................................................................................... 27
MPU-BA-e-0911 2
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3 MPU-BA-e-0911
1 Technical Data
KERN MPU 250K100
Readability (d) 100 g
Weighing range (max) 250 kg
Reproducibility 200 g
Linearity 200 g
Weighing Units kg
Adjustment weight 200 kg
Height measurement (cm) 80 – 220
Height measurement tolerance ± 1 cm
Supply voltage: 220V – 240 V AC 50 Hz
Electric Supply
Secondary voltage powerpack: 12 V 500 mA
Operating temperature + 5°C … + 35°C
Humidity of air max. 80 % (not condensing)
Dimensions fully mounted (W x
D x H) mm
380 x 525 x 2400
Weighing surface 380 x 370 x 80
Weight kg (net) 15
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2 Appliance overview
(For assembly see Section 7.1)
2
3
1
6
4
7
7
5
5
7
7
1. Ultrasonic sensor
2. Display
3. Keyboard (only for servicing purposes)
4. Connections
5. Rollers
6. Weighing plate
7. Adjustable feet
MPU-BA-e-0911 4
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5 MPU-BA-e-0911
3 Basic Information (General)
Intended use
These balance is used to calculate the weight of people
standing upright in the private sphere. Utilisation of this
balance in the medical field is not permissible.
The person must step on the weighing plate for the weighing
procedure. As soon as a stable weighing value is reached the
weighing value can be read.
Non-intended
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“ in the balance.
(Example: Slowly draining fluids from a container on the
balance.)
Do not leave permanent load on the weighing plate. 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. This could cause damage to the balance.
Never operate balance in explosive environment. The serial
version is not explosion protected.
The structure of the balance may not be modified. This may
lead to incorrect weighing results, safety-related faults and
destruction of the balance.
The balance may only be used according to the described
conditions. Other areas of use must be released by KERN in
writing.
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MPU-BA-e-0911 6
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
Dropping the balance
Test device
control
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.kernsohn.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.
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4 Basic Safety Precautions
Carefully read this operation manual before setup and
commissioning, even if you are already familiar with KERN
balances.
5 Transportation & Storage
Testing upon
acceptance
When receiving the appliance, please check packaging
immediately, and the appliance itself when unpacking for
possible visible damage.
Packing/
Return
transport
Ö Keep all parts of the original packaging for a possibly
required return.
Ö Only use original packaging for returning.
Ö Prior to dispatch disconnect all cables and remove
loose/mobile parts.
Ö Secure all parts e.g. powerpack against slipping and
damage
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MPU-BA-e-0911 8
6 Unpacking, Setup and Commissioning
Installation
location,
Deployment
location
The balance is designed in a way that reliable weighing results
are achieved in common conditions of use. You will work
accurately and fast, if you select the right location for your
balance.
On the installation site observe the following:
Place scales on a stable, even surface
Maintain a gap of 30 cm on all sides away from walls and
other objects or obstacles.
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, vapors and
dust;
Do not expose the device to extreme dampness for longer
periods of time. Non-permitted condensation
(condensation of air humidity on the appliance) may occur
if a cold appliance is taken to a considerably warmer
environment. In this case, acclimatize the disconnected
appliance for ca. 2 hours at room temperature.
Avoid static charge of the balance and of the person to be
weighed.
Avoid contact with water.
If electro-magnetic fields or static charge occur, or if the power
supply is unstable major deviations on the display (incorrect
weighing results) are possible. In that case, the location must
be changed.
Unpacking
Remove the individual components of the balance or the
complete balance from the packaging with care and install at
the intended location.
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Scope of supply
• Scales
(The top unit is packed and delivered separately from the
bottom unit, see Fig. 1)
• Screws
• Interface cable
• Operating instructions
Fig. 1
1. Top unit
2. Bottom unit
Placing
• The assembled scales are 2.40 m high.
• Maintain a gap of 30 cm on all sides away from walls and
other objects or obstacles.
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6.1 Installation
Ö Place the bottom unit together with the weighing plate on the
floor
Ö Unscrew the 6 screws on
the back of the top unit
(Fig.2)
Ö Open cover with care
Fig. 2
CAUTION
Ensure without fail that the existing cable connection to the
keyboard is not disconnected.
Ö Insert the top unit into the
bottom unit
Ö Insert the strut into the
guide in the aluminium
frame for this purpose.
Fig. 3
CAUTION
Ensure without fail that the cable for the measuring cell (LOAD
CELL) and the cable for the interface and the power supply
(COM.CONN) are not damaged.
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Ö Plug in the plug connector
for the COM.CONN cable.
Ö Plug in the plug connector
for the LOAD CELL cable.
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Fig. 4
1. COM.CONN
(interface)
2. LOAD CELL
(measuring cell)
CAUTION
Ensure correct allocation of plug connectors, as there is risk of
confusion!
Ö Close the display cover and tighten the 6 screws on the back
(Fig.2). This fixes the cover in place.
Ö Tighten 2 screws on the
back of the bottom unit.
(Fig.5)
The top unit is now securely
connected to the bottom
unit.
Fig.5
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7 Operation
Keyboard
overview
(at the back)
exclusively for servicing purposes
Overview of
displays
1. Weight value
2. Height data
3. BMI value/temperature
4. BMI ranges (see Chapter 9)
5. BMI value in the underweight range
6. BMI value in the normal weight range
7. BMI value in the overweight range
8. Zero display
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Commissioning
Ö Connect the scales to the power supply with the plug-in power
pack.
Ö The balance will carry out a self-test
If "HIGH ON" is displayed, the ultrasonic sensor is working
properly
24
Q
STEP
UP
(Example)
If "Step up" is displayed, the scales are now ready for operation.
Weighing
Stand upright in the centre of
the scales without shoes
Do not move during the
measuring process (A signal
will sound upon completion of
the weighing procedure).
Look towards the display
24
Q
STEP
UP
Ö Have person stand in the centre of the scales.
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Ø
(Example)
Ö Wait for signal and then read the results.
Weight, height and BMI (See Chapter 9) will be displayed.
The LED displays the corresponding BMI trend.
• The above results remain "frozen" for approx. 5 seconds after
stepping off the scales.
• Further measurement can only be carried out after the
weighing plate has been relieved.
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8 Adjustment
As the acceleration value due to gravity is not the same at every location on earth,
each balance must be coordinated - in compliance with the underlying physical
weighing principle - to the existing acceleration due to gravity at its place of location
(only if the balance has not already been adjusted to the location in the factory). This
adjustment process must be carried out for the first commissioning, after each
change of location as well as in case of fluctuating environment temperature. To
receive accurate measuring values it is also recommended to adjust the balance
periodically in weighing operation.
Use the adjustment weight (See chap: 1) to check and adjust the accuracy of the
balance at any time.
Adjustment
procedure
Observe stable environmental conditions.
MMENU
DATA
Ö Press :
„Menu“ and „dAtA“ is displayed
MMENU
CAL
Ö Press repeatedly until “CAL“ appears
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Ø
Ö Press :
“CALib“ followed by the adjustment weight displayed as last
appears. Furthermore „LOAd“ is displayed
Ö Change adjustment weight:
Example: 30.0 kg:
Press and keep pressed: Display goes to „0.0“.
The adjustment weight is deleted.
Ö Press and keep pressed: Enter the first digit of the
weight value: „0.3“
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Ö With double click on shift decimal point to the left:
„3.0“
Ö With an other double click on shift decimal point to
the left: „30.0“
Ö Press : „CLEAr“ appears
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Ø
Ö Press anew: The light emitting diode flashes for a
short time,
“CALiB“ and „ZERO“ appear briefly, after that appears
the entered adjustment weight „30.0“ and „PUt“
Ø
Ö Place the adjustment weight in the center of the weighing
surface
The set adjustment weight must also be placed upon
Ö Press :
“CALib“ and „LOAd“ appear. Moreover the light emitting
diode flashes anew.
After that „CALib“ and „SAVE“ and „???“ are displayed
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Ø
Ø
Ø
24
Q
STEP
UP
Ö Save with
:
“SAVED“ appears.
The adjustment is herewith concluded.
The balance changes automatically into weighing mode:
“HIGH ON“ and „StEP UP“ is displayed.
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9 BMI trend display
Above 30.0
+
between 30.0 and 27.5
between 27.5 and 25.0
between 25.0 and 22.8
✓
between 22.8 and 20.6
between 20.6 and 18.5
between 18.5 and 17.5
-
between 17.5 and 16.5
below or equal to 16.5
These figures are only guide values.
There may be slight variations depending on age and sex.
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10 Data output
The balance is typically equipped with a RS 232C interface.
Connections
1. Serial interface
2. Serial interface
3. Not available
4. Connection for
plug-in power
pack
4
3
2
1
Interface
parameters
• Baud rate 9600
• Data Bit : 8
• Parity: None
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11 Printer mode
The following conditions must be met to provide successful communication between
the weighing balance and the printer.
• Correct operation is only guaranteed with the KERN interface cable included in
the scope of supply.
• Communication parameters (Baud rate, bits and parity) need to be set on the
connected devices as specified in Chapter 10: Interface parameters.
11.1 Printout example
Standard printout “weighing data“
87.4 kg
188.0 cm
24,7 BMI
11.2 Setting automatic printed edition
MMENU
DATA
Ö Press
:
„Menu“ and „dAtA“ is displayed
Ö Press
anew:
“dAtA“ and „AUto“ „oFF or on“ are displayed
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Ö Use to change between „on“ and „oFF“:
Set “on“
Ö Press :
“data“ and „User on“ or „off“ will appear
Ö Use to change between „on“ and „oFF“:
Set “oFF“
Ö Acknowledge by .
“SAVE“ is displayed
Ø
Ö Confirm anew by pressing
“done“ is shortly displayed, followed by „High on“ and
„Step up“.
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Ø
24
Q
STE
P
UP
Now the automatic printed edition is adjusted.
The weighing values are printed out automatically.
11.3 Setting manual data output
Carry out the following adjustments as in 11.2:
Ö „Data Auto off“
Ö „Data User on“
Ö By pressing the key the weighing values are printed out.
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25 MPU-BA-e-0911
12 Error messages
„no LC“
• An incorrect power pack has been connected.
„HIGH OFF“
• Height measurement and BMI measurement do not work.
• The temperature display goes to "99"
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13 Service, maintenance, disposal
Cleaning
Please do not use aggressive detergents (solvents etc.). Apply
soapy water to moist cloth or use household detergent.
Prevent fluid from penetrating into device. Finish by polishing
with dry soft cloth. Remove dirt immediately.
Service,
maintenance
The appliance may only be opened by trained service
technicians who are authorized by KERN.
Disposal
Disposal of packaging and appliance must be carried out by
operator according to valid national or regional law of the
location where the appliance is used.
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14 Instant help
In case of a fault in the program sequence, the balance should be shortly switched
off. The weighing process must then be restarted from the beginning.
Failure: Possible cause:
The displayed weight
does not glow.
• The balance is not switched on.
The weighing result is
obviously incorrect
• Draught/air movement
• Table/floor vibrations
• The weighing plate is in contact with foreign bodies
or is not correctly positioned.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
• The display of the balance is not at zero
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• The balance is on an uneven surface.
• Electromagnetic fields / static charging (choose
different location/switch off interfering device if
possible)
• A gap of 30 cm on all sides away from walls and
other objects or obstacles has not been maintained.
Should other error messages occur, switch balance off and then on again. If the
error message remains inform manufacturer.
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