KERN MWA Series User manual

KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: [e-mail]
Phone: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
Operating manual
Multi-function weighing balance
KERN MWA
Type MWA_NM
Type MWA_PNM
Version 1.1
2017-12
GB
MWA-BAPS-e-1711

2 MWA-BAPS-e-1711
GB
KERN MWA
Version 1.1 2017-12
Operating manual
Multi-function weighing balance
Contents
1Technical data ............................................................................................ 4
2Declaration of conformity.......................................................................... 5
3Appliance overview.................................................................................... 5
4Keyboard overview .................................................................................... 8
5Overview of display.................................................................................... 9
6Basic instructions.................................................................................... 10
6.1 Proper use............................................................................................................10
6.2 Improper Use........................................................................................................10
6.3 Warranty...............................................................................................................11
6.4 Monitoring of Test Resources ...............................................................................11
7Basic Safety Precautions ........................................................................ 11
7.1 Pay attention to the instructions in the Operation Manual......................................11
9Transport and storage............................................................................. 12
9.1 Testing upon acceptance......................................................................................12
9.2 Packaging / return transport..................................................................................12
10 Unpacking, Setup and Commissioning.................................................. 13
10.1 Installation Site, Location of Use...........................................................................13
10.2 Unpacking.............................................................................................................13
10.3 Scope of delivery ..................................................................................................14
10.4 Balance assembly and installation ........................................................................14
10.4.1 Application examples: .......................................................................................................... 14
10.5 Mains connection..................................................................................................15
10.6 Battery operation is possible by obtaining an optional battery power pack............16
10.7 Battery operation...................................................................................................17
10.8 Inserting an accumulator/battery, exemplified by a battery set:.............................17
10.9 Initial Commissioning............................................................................................18
11 Operation .................................................................................................. 18
11.1 Weighing...............................................................................................................18
11.1.1 Weighing with wheelchair..................................................................................................... 19
11.2 Taring ...................................................................................................................19
11.3 HOLD function ......................................................................................................20
11.4 Display additional last decimal place.....................................................................21
11.5 Calculation of the Body Mass Index......................................................................21
11.5.1 Calculating Body Mass Index............................................................................................... 21
11.5.2 Classification of BMI values................................................................................................. 22
11.6 Automatic switch-off function „AUTO OFF“ ...........................................................23
11.7 Display background illumination............................................................................24
12 Menu.......................................................................................................... 25
12.1 Navigation in the menu .........................................................................................25

MWA-BAPS-e-1711 3
12.2 Menu overview......................................................................................................26
13 Data output RS 232 .................................................................................. 28
13.1 Pin allocation of balance output bushing:..............................................................28
13.2 Technical data ......................................................................................................28
13.3 Printer operation ...................................................................................................29
14 Error messages........................................................................................ 29
15 Servicing, maintenance, disposal........................................................... 30
15.1 Cleaning ...............................................................................................................30
15.2 Cleaning/Disinfection ............................................................................................30
15.3 Sterilisation...........................................................................................................30
15.4 Servicing, maintenance.........................................................................................30
15.5 Disposal................................................................................................................30
16 Instant help............................................................................................... 31
17 Adjustment ............................................................................................... 33

4 MWA-BAPS-e-1711
1 Technical data
KERN
MWA
300K1NM
MWA
300K1PNM
Trademark
MWA
300K1M
MWA
300K1PM
Display 6-digit
Weighing range (max) 300 kg
Reproducibility 0.1 kg
Linearity ± 0.1 kg
Display LCD with 25mm high digits
Recommended adjustment
weight, (Class) 300 kg (M1)
Stabilization time (typical) 2 sec.
Warm-up time 10 min
Operating temperature 10° C …. + 40° C
Humidity of air max. 80 % (not condensing)
Electric Supply Input voltage 100V-240V AC, 50 / 60 Hz
Auto Off After 3, 5, 15, 30 min without load change (adjustable)
Dimensions
fully assembled
(D x W X H) mm 1190 x 1140 x 80 1190 x 1140 x 1150
Weighing plate (W x D) mm 840 x 880
Weight kg (net) 72 76
Rechargeable battery
operation Optional
Batteries 6 x 1.5 V AA
Data interface
provided as standard RS 232 C

MWA-BAPS-e-1711 5
2 Declaration of conformity
To view the current EC/EU Declaration of Conformity go to:
www.kern-sohn.com/ce
3 Appliance overview
The wheelchair platform scale MWA-M with folded
and unfolded ramps and the display (serial fitting).
The wheelchair platform scale
MWA-PM with folded and
unfolded ramps, the display and
the rail with a stand (serial
fitting).
The possibility of retrofitting with
2nd rail MWA-A02 (without a
stand).
Folded wheelchair platform
scale MWA-PM.

6 MWA-BAPS-e-1711
Weighing balance suitable as
wheelchair or stand assist
balance.
1. Display Unit
2. Handrail optional
MWA-A01with tripod
(cannot be retrofitted)
MWA-A02 without tripod
3. Ramps
4. Bubble level
5. Carrying handle
Wheelchair balance
(Collapsible ramps) Suitable as wheelchair and
stand assist balance Handrail collapsible

MWA-BAPS-e-1711 7
Assembly of the rail:
Carefully mount the rail and fasten it
with screws.
The activity should preferably be
performed by two people.
Display unit back
6. Adjustment switch
7. Terminal power supply unit
8. Connecting cable
”display unit - platform"
9. Connector RS232

8 MWA-BAPS-e-1711
4 Keyboard overview
Button Designation Function
ON/OFF button Turn on/off
Hold-key
Print-key Hold function /determination of stable weighing value
Print (press and hold for a while): Data transmission via
interface RS 232
BMI key Determination of body mass index
In the menu:
•Confirm selection
For numeric entry:
•Confirm numerical value
Function key In menu:
•Call up menu
•Select menu items
For numeric entry:
•Increase numerical value
Zeroing key Weighing scale will be reset to „0.0“
For numeric entry:
•Change decimal place
TARE key Tare balance

MWA-BAPS-e-1711 9
5 Overview of display
Display Designation Description
Stability display Scales are in a steady state
Zeroing display Should the balance not display exactly
zero despite empty weighing plate, press
the button. Your balance will be set
to zero after a short standby time.
NET Net weight display Illuminated when net weight is displayed
Illuminated after weighing scale was
tared
GROSS Gross weight display Illuminated when gross weight is
displayed
HOLD HOLD function HOLD function active
BMI BMI function Illuminated while BMI function is enabled
Rechargeable /Battery
display
Shows the capacity of the rechargeable /
batteries

10 MWA-BAPS-e-1711
6 Basic instructions
6.1 Proper use
The balance is intended for determining the weight of persons in standing and sitting
positions.
In the case of multifunctional balances, the weighted person should be carefully
positioned in the centre of the weighing plate and stand still. If a wheelchair is used, it
should be positioned in the centre of the weighing plate.
The weight can be read after the balance is stabilised.
The balance is designed for continuous operation.
The weighing platform may only be stepped on by persons
capable of standing on both feet on the weighing platform.
6.2 Improper Use
Do not use these scales for dynamic weighing processes.
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 weighing
plate, 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. It should be noted that a flammable mixture of anaesthetics and oxygen or
laughing gas may occur.
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.
Do not use the balance to determine body weight in medicine.

MWA-BAPS-e-1711 11
6.3 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
•Dropping the balance
6.4 Monitoring of Test Resources
In the framework of quality assurance the measuring-related weighing 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.
7 Basic Safety Precautions
7.1 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.

12 MWA-BAPS-e-1711
9 Transport and storage
9.1 Testing upon acceptance
When receiving the appliance, please check packaging immediately, and the
appliance itself when unpacking for possible visible damage.
9.2 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 weighing platform, power unit etc.
against shifting and damage.

MWA-BAPS-e-1711 13
10 Unpacking, Setup and Commissioning
10.1 Installation Site, Location of Use
The balances are 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;
•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.
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.
Major display deviations (incorrect weighing results) may be experienced should
electromagnetic fields (e.g. due to mobile phones or radio equipment), static
electricity accumulations or instable power supply occur. Change location or remove
source of interference.
10.2 Unpacking
Remove the individual components of the balance or the complete balance from the
packaging with care and install at the intended location. When using the power pack,
ensure that the power cable does not produce a risk of stumbling.

14 MWA-BAPS-e-1711
10.3 Scope of delivery
Serial accessories:
•Balance
•Mains adapter
•Operating manual
•Wall bracket
•Small components
4 x
2 x
10.4 Balance assembly and installation
Level balance with foot screws until the air bubble of the
water balance is in the prescribed circle.
Check levelling regularly.
The weighing balance to be used as wheelchair balance is delivered fully assembled.
1 handrail with tripod (MWA-A01) or 1 handrail without tripod (MWAS-A02) are
optionally available for additional use as stand assist balance (See chap.3 device
overview). The handrails are also suitable for use in connection with wheelchairs.
10.4.1 Application examples:
Weighing balance used as
Wheelchair balance stand assist balance with handrail MWS-
A01

MWA-BAPS-e-1711 15
Assembly handrail MWA-A02 (optional):
Screw down handrail (MWA-
A02) on the frame, using the
four screws
After fitting the attachments and before using the weighing balance, check
all attachments for firm fit.
10.5 Mains connection
Power is supplied by the external power unit which also serves to isolate the mains
supply from the scale. The stated voltage value must be the same as the local
voltage.
Use only approved original KERN power units.
The LED remains illuminated as long as the weighing scale remains connected to the
mains.
The LED display informs you during loading about the loading status of the
rechargeable battery.
green: Rechargeable battery completely reloaded
blue: Charging storage battery

16 MWA-BAPS-e-1711
10.6 Battery operation is possible by obtaining an optional battery power pack
Open the battery compartment cover (1) at the base of the display unit and insert the
rechargeable battery. Charge the battery for at least 12 hours before initial use.
The appearance of the symbol in the weight display indicates that the battery
is almost exhausted. The weighing scale will remain ready for operation for a few
more minutes before switching off in order to save battery. Load rechargeable
battery.
Voltage has dropped below prescribed minimum.
Rechargeable battery very low.
Rechargeable battery completely reloaded
Right underneath the display there is a LED with the symbol .
If the LED lights green, the rechargeable battery is fully charged. If it is lighting blue,
it is being charged.
If the balance is not used for a longer time, take out the rechargeable battery and
store it separately. Leaking liquid could damage the balance.
1

MWA-BAPS-e-1711 17
10.7 Battery operation
As an alternative to rechargeable battery operation, the balance may also be
operated with 6x AA batteries.
Open battery compartment cover (1) at the lower side of the display unit and insert
batteries according to the example below. Lock the battery cover again. If the
batteries are empty, in the balance display appears the symbol . Change
batteries. To save battery power, the balance switches off automatically (see
chap.11.6 Auto off).
Capacity of batteries exhausted.
Batteries will soon be flat.
Batteries are completely charged
10.8 Inserting an accumulator/battery, exemplified by a battery set:
Remove battery compartment cover
Connect battery holder to housing
contact acc. to illustration
Insert battery holder
Insert batteries into battery
compartment and lock with battery
compartment cover.

18 MWA-BAPS-e-1711
10.9 Initial Commissioning
In order to obtain exact results with the electronic balances, your balance must have
reached the operating temperature (see warming up time chap. During this warming
up time the balance must be connected to the power supply (mains, accumulator or
battery) and be switched on.
The accuracy of the balance depends on the local acceleration of gravity.
The value of gravity acceleration is shown on the type plate.
11 Operation
11.1 Weighing
Start balance by pressing .
The balance will carry out a self-test
The scales are ready for operation as soon as the weight
display for “0.0 kg“ has appeared.
However, you can reset the weighing scale to zero by pressing
the key.
Have person stand in the centre of the scales. Wait until the
standstill display „STABLE“ appears, then read the weighing
result.
If the person is heavier than the weighing range, "OL"
(=overload) will appear in the display.

MWA-BAPS-e-1711 19
11.1.1 Weighing with wheelchair
Place wheelchair and patient in the centre of the weighing balance.
Engage brakes on wheelchair
Do not leave the patient unattended
Wait until patient is sitting still and read weighing value 1.
Loosen the brakes and carefully pull off the transportation stretcher/wheelchair
with patient
Then weigh the wheelchair without the patient and deduct the result from
weighing value 1, from this follows the weight for the patient.
11.2 Taring
The tare weight of any preloads can be deducted by pressing a button so that the
actual weight of the person is displayed in subsequent weighings.
(example)
Put an object (such as a towel, support or empty wheelchair)
on the weighing pan.
Press , the zero display appears.
„NET” is shown at the bottom on the left.
(example)
Allow the person to step onto the centre of the weighing
platform.
Wait until the standstill display „STABLE“ appears, then read
the weighing result.
When the balance is unloaded the saved taring value is
displayed with negative sign.
To delete the stored tare value, release scales and press
.

20 MWA-BAPS-e-1711
11.3 HOLD function
The balance has an integrated standstill function (mean value calculation). With this
function it is possible to weigh people accurately even if they do not stand still on the
weighing plate.
Start balance by pressing .
Wait for stability display „STABLE to appear.
(example)
Press , in the display „---------“ will appear and the
„HOLD“ symbol appears.
Allow the person to step onto the centre of the weighing
platform.
After a short time the stability display „STABLE“ appears and
the weighing value of the person is displayed and „frozen“.
After unloading the balance, the weighing value remains
displayed for approx. 10 seconds, than the balance changes
automatically into the weighing mode.
The „HOLD“ symbol disappears.
There is no average value calculation in the event of too much
movement.