KERN MWA 300-K1M 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 300-K1M
Type MWA 300-K1PM
Type MWA 300-K1NM
Type MWA 300-K1PNM
Version 3.0
2017-02
GB
MWA_M-BA-e-1730

2 MWA_M-BA-e-1730
D Weitere Sprachversionen finden Sie online unter www.kern-sohn.com/manuals
BG Други езикови версии ще намерите в сайта www.kern-sohn.com/manuals
DK Flere sprogudgaver findes på websiden www.kern-sohn.com/manuals
EST Muud keeleversioonid leiate Te leheküljel www.kern-sohn.com/manuals
E Más versiones de idiomas se encuentran online bajo www.kern-sohn.com/manuals
GR Άλλες γλωσσικές αποδόσεις θα βρείτε στην ιστοσελίδα www.kern-sohn.com/manuals
F Vous trouverez d’autres versions de langue online sous www.kern-sohn.com/manuals
LV Citas valodu versijas atradīsiet vietnē www.kern-sohn.com/manuals
FIN Muut kieliversiot löytyvät osoitteesta www.kern-sohn.com/manuals
LT Kitas kalbines versijas rasite svetainėje www.kern-sohn.com/manuals
GB Further language versions you will find online under www.kern-sohn.com/manuals
RO Alte versiuni lingvistice veţi găţi pe site-ul www.kern-sohn.com/manuals
I Trovate altre versioni di lingue online in www.kern-sohn.com/manuals
SK Iné jazykové verzie nájdete na stránke www.kern-sohn.com/manuals
NL Bijkomende taalversies vindt u online op www.kern-sohn.com/manuals
SLO Druge jezikovne različice na voljo na spletni strani www.kern-sohn.com/manuals
P Encontram-se online mais versões de línguas em www.kern-sohn.com/manuals
CZ Jiné jazykové verze najdete na stránkách www.kern-sohn.com/manuals
PL Inne wersje językowe znajdą Państwo na stronie www.kern-sohn.com/manuals
SE Övriga språkversioner finns här: www.kern-sohn.com/manuals
H A további nyelvi változatok a következő oldalon találhatók: www.kern-sohn.com/manuals
HR Druge jezične verzije su dostupne na stranici: www.kern-sohn.com/manuals
LT Kitas kalbines versijas rasite svetainėje www.kern-sohn.com/manuals
NO Andre språkversjoner finnes det på www.kern-sohn.com/manuals

MWA_M-BA-e-1730 3
GB
KERN MWA
Version 3.0 2017-02
Operating manual
Multi-function weighing balance
Contents
1Technical data ............................................................................................ 5
2Declaration of conformity.......................................................................... 7
2.1 Explanation of the graphic symbols........................................................................ 7
3Appliance overview.................................................................................. 10
4 ............................................................................................................................... 13
5Keyboard overview .................................................................................. 14
6Overview of display.................................................................................. 15
7Basic instructions.................................................................................... 16
7.1 Specific function....................................................................................................16
7.2 Proper use............................................................................................................16
7.3 Improper Use........................................................................................................17
7.4 Warranty...............................................................................................................17
7.5 Monitoring of Test Resources ...............................................................................17
8Basic Safety Precautions ........................................................................ 18
8.1 Pay attention to the instructions in the Operation Manual......................................18
8.2 Personnel training.................................................................................................18
8.3 Preventing contamination......................................................................................18
9Electromagnetic compatibility (EMC)..................................................... 19
9.1 General hints ........................................................................................................19
9.2 Electromagnetic interferences...............................................................................20
9.3 Electromagnetic noise immunity............................................................................21
9.3.1 Crucial features of performance........................................................................................... 23
9.4 Minimum distances...............................................................................................23
10 Transport and storage............................................................................. 24
10.1 Testing upon acceptance......................................................................................24
10.2 Packaging / return transport..................................................................................24
11 Unpacking, Setup and Commissioning.................................................. 25
11.1 Installation Site, Location of Use...........................................................................25
11.2 Unpacking.............................................................................................................25
11.3 Scope of delivery ..................................................................................................26
11.4 Balance assembly and installation ........................................................................26
11.4.1 Application examples:.......................................................................................................... 26
11.5 Mains connection..................................................................................................27
11.6 Battery operation is possible by obtaining an optional battery power pack............28
11.7 Battery operation...................................................................................................29
11.8 Initial Commissioning............................................................................................31

4 MWA_M-BA-e-1730
12 Operation .................................................................................................. 31
12.1 Weighing...............................................................................................................31
12.1.1 Weighing with wheelchair..................................................................................................... 32
12.2 Taring ...................................................................................................................32
12.3 HOLD function ......................................................................................................33
12.4 Display additional last decimal place.....................................................................34
12.5 Calculation of the Body Mass Index......................................................................34
12.5.1 Calculating Body Mass Index............................................................................................... 34
12.5.2 Classification of BMI values................................................................................................. 35
12.6 Automatic switch-off function „AUTO OFF“ ...........................................................36
12.7 Display background illumination............................................................................37
13 Menu.......................................................................................................... 38
13.1 Navigation in the menu .........................................................................................38
13.2 Menu overview......................................................................................................39
14 Data output RS 232 .................................................................................. 41
14.1 Pin allocation of balance output bushing:..............................................................41
14.2 Technical data ......................................................................................................41
14.3 Printer operation ...................................................................................................42
15 Error messages........................................................................................ 42
16 Servicing, maintenance, disposal........................................................... 43
16.1 Cleaning ...............................................................................................................43
16.2 Cleaning / disinfecting...........................................................................................43
16.3 Sterilisation...........................................................................................................43
16.4 Servicing, maintenance.........................................................................................43
16.5 Disposal................................................................................................................43
17 Instant help............................................................................................... 44
18 Verification................................................................................................ 45
18.1 Verification validity period (current status in G).....................................................47
19 Adjustment ............................................................................................... 48
20 Accessories (optional)............................................................................. 50

MWA_M-BA-e-1730 5
1 Technical data
KERN (Type)
MWA
300K1NM
MWA
300K1PNM
Trademark
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; 6 x 1.2 V 2000 mA
Batteries 6 x 1.5 V AA
Data interface
provided as standard RS 232 C

6 MWA_M-BA-e-1730
KERN (Type)
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; 6 x 1.2 V 2000 mA
Batteries 6 x 1.5 V AA
Data interface
provided as standard RS 232 C

MWA_M-BA-e-1730 7
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 170012
Designation of the serial number of every device, applied at the
device and on the packaging
Number here as example
2017-02
Identification of the manufacturing date of the medical product.
Year and month here as example

8 MWA_M-BA-e-1730
“Please note the accompanying documents“
or “Please note operating instructions”
“Observe operating instructions”
“Observe operating instructions”
Kern & Sohn GmbH
D–72336 Balingen,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 lower limit (-20°C) and the upper
(+60°C) limit (storage temperature on packaging)
12 V DC / 500 mA
Display of supply voltage for scales with polarity display.
+70°C
-30°C
+60℃
-20
℃

MWA_M-BA-e-1730 9
Safety instruction: Do not place hands beneath the ramp.
Mains connection
Sealing mark KERN SEAL
Supply voltage direct current
Information
Level balance before use

10 MWA_M-BA-e-1730
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.

MWA_M-BA-e-1730 11
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 A04 rail with seat , foldable
•Masses rail (DxWxH): 560x40x920 mm
•Masses seat: 340x470x470 mm
•Netweight: 8.0 kg

12 MWA_M-BA-e-1730
Assembly of the rail and the seat:
Carefully mount the rail and fasten it
with screws.
The activity should preferably be
performed by two people.
If the seat is used, make sure that it latches into position after you unfold it
(see the figure below).
Seat unlatched
Seat latched

MWA_M-BA-e-1730 13
Display unit back
6. Adjustment switch
7. Terminal power supply unit
8. Connecting cable
”display unit - platform"
9. Connector RS232
4

14 MWA_M-BA-e-1730
5 Keyboard overview
Type MWA 300K-1M
Type MWA 300K-1PM Type MWA 300K-1NM Type MWA 300K-1PNM
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_M-BA-e-1730 15
6 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

16 MWA_M-BA-e-1730
7 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.”
7.1 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
7.2 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.

MWA_M-BA-e-1730 17
7.3 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.
7.4 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
7.5 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.

18 MWA_M-BA-e-1730
8 Basic Safety Precautions
8.1 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.
8.2 Personnel training
The medical staff must apply and follow the operating instructions for proper use and
care of the product.
8.3 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).

MWA_M-BA-e-1730 19
9 Electromagnetic compatibility (EMC)
9.1 General hints
The installation and use of the electrical multi-function balances MWA
300-K1M, MWA 300-K1PM, MWA 300-K1NM, MWA 300-K1PNM
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 300-K1M, MWA 300-K1PM, MWA 300-K1NM, MWA 300-K1PNM . The multi-
function balances MWA 300-K1M, MWA 300-K1PM, MWA 300-K1NM, MWA 300-
K1PNM, 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 300-K1M, MWA 300-K1PM,
MWA 300-K1NM, MWA 300-K1PNM in one and the same place.
•Connect the multi-function balances MWA 300-K1M, MWA 300-K1PM, MWA
300-K1NM, MWA 300-K1PNM 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 300-K1M, MWA 300-K1PM, MWA 300-
K1NM, MWA 300-K1PNM. Do not use these near multi-function
balances MWA 300-K1M, MWA 300-K1PM, MWA 300-K1NM, MWA
300-K1PNM. Chapter 8.4 contains details about recommended
minimum distances.

20 MWA_M-BA-e-1730
9.2 Electromagnetic interferences
Guidelines and manufacturer’s declaration – electromagnetic interferences
The multi-function balances MWA 300-K1M, MWA 300-K1PM, MWA 300-K1NM, MWA 300-
K1PNM are intended for operation in the kind of electromagnetic environment stated below.
The customer or user of the multi-function balances MWA 300-K1M, MWA 300-K1PM, MWA
300-K1NM, MWA 300-K1PNMshould 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
300-K1M, MWA 300-K1PM, MWA
300-K1NM, MWA 300-K1PNM
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
300-K1M, MWA 300-K1PM, MWA
300-K1NM, MWA 300-K1PNMare
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 300-K1M, MWA 300-K1PM,
MWA 300-K1NM, MWA 300-K1PNM immediately next to or together with other
devices. If this type of operation is necessary, observe the multi-function balances
MWA 300-K1M, MWA 300-K1PM, MWA 300-K1NM, MWA 300-K1PNM to ensure
normal operation in such an arrangement.