KERN MWA-M 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-M / MWA-PM
Version 1.4
04/2016
GB
MWA-M / MWA-PM-BA-e-1614

2 MWA-M / MWA-PM-BA-e-1614
GB
KERN MWA 300K1M / MWA 300K1PM
Version 1.404/2016
Operating manual
Multi-function weighing balance
Contents
1Technical data ............................................................................................ 4
2Declaration of conformity.......................................................................... 5
2.1 Explanation of the graphic symbols........................................................................ 5
3Appliance overview.................................................................................... 7
4Keyboard overview .................................................................................... 9
5Overview of display.................................................................................. 10
6Basic instructions.................................................................................... 11
6.1 Specific function....................................................................................................11
6.2 Proper use............................................................................................................11
6.3 Improper Use........................................................................................................12
6.4 Warranty...............................................................................................................12
6.5 Monitoring of Test Resources ...............................................................................12
7Basic Safety Precautions ........................................................................ 13
7.1 Pay attention to the instructions in the Operation Manual......................................13
7.2 Personnel training.................................................................................................13
7.3 Preventing contamination......................................................................................13
8Electromagnetic compatibility (EMC)..................................................... 14
8.1 General hints ........................................................................................................14
8.2 Electromagnetic interferences...............................................................................15
8.3 Electromagnetic noise immunity............................................................................16
8.3.1 Crucial features of performance........................................................................................... 18
8.4 Minimum distances...............................................................................................18
9Transport and storage............................................................................. 19
9.1 Testing upon acceptance......................................................................................19
9.2 Packaging / return transport..................................................................................19
10 Unpacking, Setup and Commissioning.................................................. 20
10.1 Installation Site, Location of Use...........................................................................20
10.2 Unpacking.............................................................................................................20
10.3 Scope of delivery ..................................................................................................21
10.4 Balance assembly and installation ........................................................................21
10.4.1 Application examples: .......................................................................................................... 21
10.5 Mains connection..................................................................................................22
10.6 Battery operation is possible by obtaining an optional battery power pack............23
10.7 Battery operation...................................................................................................24
10.8 Initial Commissioning............................................................................................26

MWA-M / MWA-PM-BA-e-1614 3
11 Operation .................................................................................................. 26
11.1 Weighing...............................................................................................................26
11.1.1 Weighing with wheelchair..................................................................................................... 27
11.2 Taring ...................................................................................................................27
11.3 HOLD function......................................................................................................28
11.4 Display additional last decimal place.....................................................................29
11.5 Calculation of the Body Mass Index......................................................................29
11.5.1 Calculating Body Mass Index............................................................................................... 29
11.5.2 Classification of BMI values................................................................................................. 30
11.6 Automatic switch-off function „AUTO OFF“ ...........................................................31
11.7 Display background illumination............................................................................32
12 Menu.......................................................................................................... 33
12.1 Navigation in the menu .........................................................................................33
12.2 Menu overview......................................................................................................34
13 Data output RS 232 .................................................................................. 36
13.1 Pin allocation of balance output bushing:..............................................................36
13.2 Technical data ......................................................................................................36
13.3 Printer operation ...................................................................................................37
14 Error messages........................................................................................ 37
15 Servicing, maintenance, disposal........................................................... 38
15.1 Cleaning ...............................................................................................................38
15.2 Cleaning / disinfecting...........................................................................................38
15.3 Servicing, maintenance.........................................................................................38
15.4 Disposal................................................................................................................38
16 Instant help............................................................................................... 39
17 Verification................................................................................................ 40
17.1 Verification validity period (current status in G).....................................................42
18 Adjustment ............................................................................................... 43

4 MWA-M / MWA-PM-BA-e-1614
1 Technical data
KERN
MWA
300K1M
MWA
300K1PM
Display 6-digit
Weighing range (max) 300 kg
Minimum load (Min) 2 kg
Verification value (e) 100 g
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 880 x 840
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-M / MWA-PM-BA-e-1614 5
2 Declaration of conformity
To view the current EC/EU Declaration of Conformity go to:
www.kern-sohn.com/ce
The scope of delivery for verified weighing balances (= conformity-
rated weighing balances) includes a Declaration of Conformity.
Solely these weighing balances are classified as medical devices.
2.1 Explanation of the graphic symbols
This marking indicates that these weighing balances are in
conformity with EU Directive 2014/31/EU for non-automatic
weighing balances. Weighing balances bearing this
marking are licensed for medical purposes in the European
Union.
The number inside the frame“M16“ (example shown year
16) documents the year of conformity assessment.
This marking shows that this weighing balance is in
conformity with EU Directive 93/42/EEC and inside the
European Community is classified as medical device.
WF 150012
Designation of the serial number of every device, applied at the
device and on the packaging
Number here as example
2016-03
Identification of the manufacturing date of the medical product.
Year and month here as example
“Please note the accompanying documents“
or “Please note operating instructions”

6 MWA-M / MWA-PM-BA-e-1614
“Observe operating instructions”
“Observe operating instructions”
Kern & Sohn GmbH
D–72336 Baligen,Germany
www.kern-sohn.com
Identification of manufacturer of medical product including
address
“Electro-medical appliance“
with attachment for type B
Device protection category II
Dispose of old appliances separately from your household
waste!
Instead, take them to communal collection points.
Temperature limit indicating the upper and the lower limit
(storage temperature on packaging)
(Temperature serving as an example)
12 V DC / 500 mA
Display of supply voltage for scales with polarity display.
Safety instruction: Do not place hands beneath the ramp.
+70°C
-30°C

MWA-M / MWA-PM-BA-e-1614 7
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.

8 MWA-M / MWA-PM-BA-e-1614
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
Display unit back
6. Adjustment switch
7. Terminal power supply unit
8. Connecting cable
”display unit - platform"
9. Connector RS232

MWA-M / MWA-PM-BA-e-1614 9
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

10 MWA-M / MWA-PM-BA-e-1614
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

MWA-M / MWA-PM-BA-e-1614 11
6 Basic instructions
Weighing instruments have to be verified for the purposes stated
below in accordance with Directive 2009/23/EC.
Article 1,
paragraph 4. “Determination of mass in the practice of medicine
that is, weighing patients for reasons of medical supervision
during medical surveillance, examination and treatment.”
6.1 Specific function
Indication

Determining the body weight in the medical practice area.
Use as „non-standalone weighing scale“, that is, a person
steps carefully onto the weighing platform‘s centre. Once a
steady display value is shown, you can read the weight value.
For weighing with a wheelchair, the wheelchair and the person
sitting on it are pushed over the ramp onto the centre of the
weighing platform or, in the case of an electric wheelchair, the
patient and wheelchair move independently onto the weighing
platform. Once a steady display value is shown, you can read
the weight value.
Contraindication
No contraindication known
6.2 Proper use
This weighing balance is designed for determining the weight of persons in a
standing or sitting position in medical treatment rooms. The balance is suitable for
recognising, preventing and controlling illnesses.
On multi-function balances, the weighed person should step onto the centre of the
weighing platform and remain standing without moving. For weighing with a
wheelchair, the wheelchair should be placed in the centre of the weighing platform.
As soon as a stable weighing value is reached the weighing value can be read.
The weighing scale is designed for continuous duty.
The weighing platform may only be stepped on by persons
capable of standing on both feet on the weighing platform.
The balance should be checked for correct condition prior to each utilisation by a
person familiar with proper operation of the balance.

12 MWA-M / MWA-PM-BA-e-1614
6.3 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.
6.4 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
6.5 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.

MWA-M / MWA-PM-BA-e-1614 13
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.
7.2 Personnel training
The medical staff must apply and follow the operating instructions for proper use and
care of the product.
7.3 Preventing contamination
The prevention of cross-contamination (fungal skin infections,……) requires regular
cleaning of the weighing platform. Recommendation: after a weighing procedure that
could potentially result in contamination (e. g. after weighing that involves direct skin
contact).

14 MWA-M / MWA-PM-BA-e-1614
8 Electromagnetic compatibility (EMC)
8.1 General hints
The installation and use of the electrical multi-function balances MWA
requires special precautionary measures as outlined in the EMC
information below.
This device complies with the limits set for medical electrical devices of group 1,
class B (as per EN 60601-1-2).
Electromagnetic compatibility (EMC) describes a device’s ability to perform reliably
within an electromagnetic environment without causing inadmissible electromagnetic
interference at the same time. Amongst other things, such disturbances may be
emitted by connecting cables or the air.
Inadmissible disturbances from the environment may result in incorrect displays,
inaccurate measured values or incorrect behaviour of the multi-function balances
MWA. The multi-function balances MWA, too, may in certain cases cause such
malfunctions in other devices. To eliminate problems of that kind, we recommend you
to take one or several of the measures listed below:
•Change the alignment or distance of the device to the source of failure.
•Install and use the multi-function balances MWA in one and the same place.
•Connect the multi-function balances MWA to a separate power source.
•For further questions please contact our customer services.
Disturbances may be caused by improper modification or add-ons to the device or
not recommended accessories (such as power units or connecting cables). The
manufacturer will not be responsible for these. Modifications may also result in a loss
of authorisation relating to the use of the device.
Devices emitting high frequency signals (mobile telephones, radio
transmitters, radio receivers) may cause interference in the multi-
function balances MWA. Do not use these near multi-function
balances MWA. Chapter 8.4 contains details about recommended
minimum distances.

MWA-M / MWA-PM-BA-e-1614 15
8.2 Electromagnetic interferences
Guidelines and manufacturer’s declaration – electromagnetic interferences
The multi-function balances MWA are intended for operation in the kind of electromagnetic
environment stated below. The customer or user of the multi-function balances MWA should
ensure that they are operated in this kind of environment.
Emitted interference
measurements
Conformity
Electromagnetic environment -
guideline
HF emissions
as per CISPR 11 / EN 55011
Assembly 1
The multi-function balances MWA
apply HF energy exclusively for
their internal function. Their HF
emission therefore is very low and
it is highly unlike to interfere with
adjacent electronic devices.
HF emissions
as per CISPR 11 / EN 55011
Class B
The multi-function balances MWA
are designed for use in all
equipment including those in living
areas and those connected directly
to the public power grid that also
supplies buildings used for living
purposes.
Emission of harmonics
acc. to IEC 61000-3-2
Class A
Emission of voltage fluctuations /
flicker
acc. to IEC 61000-3-3
Conforms with
Do not stack or operate multi-function balances MWA immediately next to or together
with other devices. If this type of operation is necessary, observe the multi-function
balances MWA to ensure normal operation in such an arrangement.

16 MWA-M / MWA-PM-BA-e-1614
8.3 Electromagnetic noise immunity
Guidelines and manufacturer’s declaration - electromagnetic noise immunity
The multi-function balances MWA are intended for operation in the kind of electromagnetic
environment stated below. The customer or user of the multi-function balances MWA should ensure
that they are operated in this kind of environment.
Noise immunity tests
IEC 60601 test level
Conformity
Electromagnetic
environment - guideline
Discharge static
electricity (DSE)
acc. to IEC 61000-4-2
± 6 kV contact discharge
± 8 kV air discharge
± 6 kV
± 8 kV
Floors should be made of
wood or concrete or tiled with
ceramic tiles. If floors are
covered with synthetic
material, relative air humidity
must be at least 30%.
Fast transient electrical
disturbances / bursts
acc. to IEC 61000-4-4
± 2 kV for power lines
+ 1 kV for input and
output lines
± 2 kV
+ 1 kV
The quality of the supply
voltage should match that of
the typical business or
hospital environment.
Impulse voltages /
surges
acc. to IEC 61000-4-5
± 1 kV voltage
Live wire - live wire
± 2 kV voltage
Live wire - earth
± 1 kV
Inapplicable
The quality of the supply
voltage should match that of
the typical business or
hospital environment.
Voltage dips, short-term
disruptions and
fluctuations in supply
voltage
acc. to IEC 61000-4-11
< 5 %
(> 95 % dip of )
for ½ period
40 %
(> 60 % dip of )
for 5 periods
70 %
(> 30 % dip of )
for 25 periods
< 5 %
(> 95 % dip of )
for 5 s
Compliance
with
requirements
under all
postulated
conditions
Controlled
switch off
Return to
undisturbed
situation
after user
intervention.
The quality of the supply
voltage should match that of
the typical business or
hospital environment. If the
user demands continued
functioning of multi-function
balances MWA even after the
occurrence of a power failure,
we recommend using
uninterruptible means of
power supply or batteries for
the multi-function balances
MWA.
Magnetic field for supply
frequency
(50/60 Hz)
acc. to IEC 61000-4-8
3 A/m
3 A/m
50/60 Hz
Magnetic fields for the supply
frequency should match the
typical values found in the
particular business or hospital
environment.
NOTE equals AC line voltage prior to application of test level.

MWA-M / MWA-PM-BA-e-1614 17
Guidelines and manufacturer’s declaration - electromagnetic noise immunity
The multi-function balances MWA are intended for operation in the kind of electromagnetic
environment stated below. The customer or user of the multi-function balances MWA should ensure
that they are operated in this kind of environment.
Noise immunity
tests
IEC 60601 test level
Conformity
Electromagnetic environment -
guideline
Conducted HF
disturbance
variables
acc. to IEC 61000-4-
6
3
150 kHz to 80 MHz
3 V
Do not use portable or mobile radio
sets nearer to the multi-function
balances MWA or their wires than the
distance recommended as safety
distance which is calculated according
to the equation relevant for its
transmission frequency.
Recommended safety distance:
for 80 MHz to 800 MHz
for 800 MHz up to 2.5 GHz
Use P as rated capacity of radio
transmitter in Watt (W) as per details
given by the radio transmitter
manufacturer and d as recommended
safety distance in metres (m).
The field intensity of stationary radio
transmitters should for all frequencies
be lower according to an in situ a
examination than the conformity level.b
Interference may occur near devices
bearing the symbol below.
Emitted HF
disturbance
variables
Acc. to IEC 61000-4-
3
3
80 MHz to 2.5 GHz
3 V/m
NOTE 1 Higher frequency range applies to 80 MHz and 800 MHz.
NOTE 2 These guidelines may not be applicable in all cases.
The spread of electromagnetic variables is influenced by absorption and
reflections in buildings, objects and humans.
aThe field intensity of stationary radio transmitters such as base stations of wireless telephones and
mobile radio sets, amateur radio stations, AM and FM radio and television stations cannot be
reliably predicted in advance. To determine the electromagnetic environment in respect of
stationary transmitters, you should consider a study of electromagnetic phenomena at the location.
If the measured field intensity at the location where the balance is to be used exceeds the
conformity level above, you should observe the multifunctional balances MWA in order to ensure
normal operation. If you observe unusual features of performance you may have to take additional
measures such as a change in alignment or a different location for the multifunctional balances
MWA.
b
For a frequency range of 150 kHz to 80 MHz field intensity should be less than 3 V/m.

18 MWA-M / MWA-PM-BA-e-1614
8.3.1 Crucial features of performance
Note:
The multifunctional balances MWA do not have any crucial features of
performance as per IEC 60601-1. The system may be subject to
interference by other devices even if these devices conform to current
emission requirements as per CISPR.
8.4 Minimum distances
Recommended safety distance between portable and mobile HF
telecommunication devices and multi-function balances MWA
The multi-function balances MWA are designed for use in an electromagnetic environment in
which HF disturbance variables are controlled. The customer or user of the multi-function
balances MWA can help avoiding electromagnetic disturbances by keeping the minimum
distance between portable and mobile HF telecommunication devices (transmitters) and the
multi-function balances MWA – depending on the output performance of the communication
device, as stated below.
Rated capacity of
transmitter
W
The safety distance depends on the transmission
frequency
m
150 kHz up to 80
MHz
80 MHz up to 800
MHz
800 MHz up to 2.5
GHz
0.01
0.12
0.12
0.23
0.1
0.38
0.38
0.73
1
1.20
1.20
2.30
10
3.80
3.80
7.30
100
12.00
12.00
23.00
For transmitters with a maximum rated capacity not stated in the table above you can
calculate the recommended safety distance in metres (m) yourself by using the equation
belonging to each column, whereby P equals the maximum rated capacity of the transmitter
in Watt (W) as per details provided by the transmitter manufacturer.
NOTE 1 Higher frequency range applies to 80 MHz and 800 MHz.
NOTE 2 These guidelines may not be applicable in all cases.
The spread of electromagnetic variables is influenced by absorption and
reflections in buildings, objects and humans.

MWA-M / MWA-PM-BA-e-1614 19
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.

20 MWA-M / MWA-PM-BA-e-1614
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.