KERN MWA-M, MWA-PM Operating Manual
KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
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 1.4 04/2016
Operating manual
Multi-function weighing balance
Contents
1 Technical data ............................................................................................ 4
2 Declaration of conformity .......................................................................... 5
2.1 Explanation of the graphic symbols ........................................................................ 5
3 Appliance overview .................................................................................... 7
4 Keyboard overview .................................................................................... 9
5 Overview of display .................................................................................. 10
6 Basic 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
7 Basic Safety Precauti on s ........................................................................ 13
7.1 Pay attention to the instructions in the Operation Manual ......................................13
7.2 Personnel training .................................................................................................13
7.3 Preventing contamination ......................................................................................13
8 Electromagnetic comp at ib ility (EMC) ..................................................... 14
8.1 General hints ........................................................................................................14
8.2 Electromagnetic interf erences ...............................................................................15
8.3 Electromagnetic noise immunity ............................................................................
16
8.3.1 Crucial features of performance ........................................................................................... 18
8.4 Minimum distances ...............................................................................................18
9 Transport and storage ............................................................................. 19
9.1 Testing upon acceptance ......................................................................................19
9.2 Packaging / return transport ..................................................................................19
10 Unpacking, Setup and Commissioning .................................................. 20
10.1 I nstallation Site, Location of Use ...........................................................................20
10.2 Unpacking .............................................................................................................20
10.3 Scope of delivery ..................................................................................................21
10.4 Balance assem bly and installation ........................................................................21
10.4.1 Application examples: .......................................................................................................... 21
10.5 Mains connect ion ..................................................................................................22
10.6 Battery operation is possible by obtaining an optional battery power pack ............23
10.7 Battery operation ...................................................................................................24
10.8 I n itial 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 Displa y 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 Displa y background illumination ............................................................................32
12 Menu .......................................................................................................... 33
12.1 Navigation in t he 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 Print er operation ...................................................................................................37
14 Error messages ........................................................................................ 37
15 Servicing, maintenance, disposal ........................................................... 38
15.1 Cleaning ...............................................................................................................38
15.2 Clea n ing / disinfecting ...........................................................................................38
15.3 Servicing, maintenance .........................................................................................38
15.4 Disposal ................................................................................................................38
16 Instant help ............................................................................................... 39
17 Verification ................................................................................................ 40
17.1 Verif icat ion 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 (= conformityrated 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,German y
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 suitabl e for
recognising, preventing and controlling illnesses.
On multi-function balances, the weighed person should step onto the centre of the
weighing platform and remai n stan di ng w it hout mov i ng . 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 fault s and des tr uc ti on o f the bala nce.
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 disturb ances 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 multifunction balances MWA. Do not use these near multi-function
balances MWA. Chapter 8.4 contains details about recommended
minimum distances.
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