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KERN & Sohn GmbH
Ziegelei 1 Phone: +49-[0]7433- 9933-0
D-72336 Balingen Fax: +49-[0]7433-9933-149
E-Mail: [email protected] Internet: www.kern-sohn.com
Operating manual
Multi-function weighing balance
KERN MWA-M
Version 1.0
08/2014
GB
MWA-M-BA-e-1410
GB
KERN MWA 300K1M
Version 1.0 07/2014
Operating manual
Multi-function weighing balance
Contents
4
5
1
2
2.1
3
Technical data ............................................................................................ 4
Declaration of conformity .......................................................................... 5
Explanation of the graphic symbols ........................................................................ 5
Appliance overview .................................................................................... 7
Keyboard overview .................................................................................... 9
Overview of display .................................................................................. 10
8
8.1
8.2
8.3
8.3.1
8.4
9
9.1
9.2
6
6.1
6.2
6.3
6.4
6.5
7
7.1
7.2
7.3
Basic instructions .................................................................................... 11
Specific function ....................................................................................................11
Proper use ............................................................................................................11
Improper Use ........................................................................................................12
Warranty ...............................................................................................................12
Monitoring of Test Resources ...............................................................................12
Basic Safety Precautions ........................................................................ 13
Pay attention to the instructions in the Operation Manual ......................................13
Personnel training .................................................................................................13
Preventing contamination ......................................................................................13
Electromagnetic compatibility (EMC) ..................................................... 14
General hints ........................................................................................................14
Electromagnetic interferences ...............................................................................15
Electromagnetic noise immunity ............................................................................16
Crucial features of performance ........................................................................................... 18
Minimum distances ...............................................................................................18
Transport and storage ............................................................................. 19
Testing upon acceptance ......................................................................................19
Packaging / return transport ..................................................................................19
10 Unpacking, Setup and Commissioning .................................................. 20
10.1
10.2
10.3
10.4
10.4.1
Application examples: .......................................................................................................... 21
10.5
10.6
10.7
10.8
Installation Site, Location of Use ...........................................................................20
Unpacking .............................................................................................................20
Scope of delivery ..................................................................................................21
Balance assembly and installation ........................................................................21
Mains connection ..................................................................................................23
Battery operation is possible by obtaining an optional battery power pack ............24
Battery operation ...................................................................................................25
Initial Commissioning ............................................................................................28
2 MWA-M-BA-e-1410
15
15.1
15.2
15.3
15.4
16
12
12.1
12.2
13
13.1
13.2
13.3
14
17
17.1
18
11 Operation .................................................................................................. 28
11.1
Weighing ...............................................................................................................28
11.1.1
Weighing with wheelchair ..................................................................................................... 29
11.2
11.3
11.4
11.5
11.5.1
Calculating Body Mass Index ............................................................................................... 31
11.5.2
Classification of BMI values ................................................................................................. 32
11.6
11.7
Taring ...................................................................................................................29
HOLD function ......................................................................................................30
Display additional last decimal place .....................................................................31
Calculation of the Body Mass Index ......................................................................31
Automatic switch-off function „AUTO OFF“ ...........................................................33
Display background illumination ............................................................................34
Menu .......................................................................................................... 35
Navigation in the menu .........................................................................................35
Menu overview ......................................................................................................36
Data output RS 232 .................................................................................. 38
Pin allocation of balance output bushing: ..............................................................38
Technical data ......................................................................................................38
Printer operation ...................................................................................................39
Error messages ........................................................................................ 39
Servicing, maintenance, disposal ........................................................... 40
Cleaning ...............................................................................................................40
Cleaning / disinfecting ...........................................................................................40
Servicing, maintenance .........................................................................................40
Disposal ................................................................................................................40
Instant help ............................................................................................... 41
Verification ................................................................................................ 42
Verification validity period (current status in G) .....................................................44
Adjustment ............................................................................................... 45
MWA-M-BA-e-1410 3
1 Technical data
KERN
Display
Weighing range (max)
Minimum load (Min)
Verification value (e)
Reproducibility
Linearity ±
Display
Recommended adjustment weight, (Class)
Stabilization time (typical)
Warm-up time
Operating temperature
Humidity of air
Electric Supply
Auto Off
Dimensions fully assembled
(D x W X H) mm
Weighing plate mm
Weight kg (net)
Rechargeable battery operation
Batteries
Data interface provided as standard
MWA
300K1M
6-digit
300 kg
2 kg
100 g
0.1 kg
0.1 kg
LCD with 25mm high digits
300 kg
(M1)
2 sec.
10 min
- 10° C …. + 40° C max. 80 % (not condensing)
Input voltage 100V-240V AC, 50 / 60 Hz
After 3 min without load change (adjustable)
1180 x 1000 x 1130
880 x 840
57.6
Optional
6 x 1.5 V AA
RS 232 C
4 MWA-M-BA-e-1410
2 Declaration of conformity
Declaration of conformity: See separate document showing serial number of device
CE marking:
0297 year
0103
M
93/42/EEC
2009 / 23 / EG
Non-automatic Weighing Instruments Directive
2.1 Explanation of the graphic symbols
WF 150012
This EC verification mark indicates that these scales are in conformity with EC Directive 2009 / 23 / EC for Non-
Automatic Weighing Instruments.
Weighing instruments bearing this mark are approved for medical purposes within the
European Union.
Designation of the serial number of every device, applied at the device and on the packaging
Number here as example
Identification of the manufacturing date of the medical product.
Year and month here as example
2015-01
“Please note the accompanying documents“ or “Please note operating instructions”
MWA-M-BA-e-1410
“Observe operating instructions”
“Observe operating instructions”
5
Identification of manufacturer of medical product including address
Kern & Sohn GmbH
D–72336 Baligen,Germany www.kern-sohn.com
“Electro-medical appliance“ with attachment for type B
Device protection category II
+70°C
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)
-30°C
12 V DC / 500 mA
Display of supply voltage for scales with polarity display.
6 MWA-M-BA-e-1410
3 Appliance overview
Wheelchair balance standard equipment with collapsible ramps and display unit
(handrail MWA-A01 optional)
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-M-BA-e-1410 7
Display unit back
6. Adjustment switch
7. Terminal power supply unit
8. Connecting cable
”display unit - platform"
9. Connector RS232
8 MWA-M-BA-e-1410
4 Keyboard overview
Button Designation Function
ON/OFF button Turn on/off
Hold-key
Print-key
BMI key
Function key
Zeroing key
TARE key
Hold function /determination of stable weighing value
Print (press and hold for a while): Data transmission via interface RS 232
Determination of body mass index
In the menu:
• Confirm selection
For numeric entry:
• Confirm numerical value
In menu:
• Call up menu
• Select menu items
For numeric entry:
• Increase numerical value
Weighing scale will be reset to „0.0“
For numeric entry:
• Change decimal place
Tare balance
MWA-M-BA-e-1410 9
5 Overview of display
Display
NET
GROSS
HOLD
BMI
Designation
Stability display
Zeroing display
Net weight display
Gross weight display
HOLD function
BMI function
Rechargeable /Battery display
Description
Scales are in a steady state
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.
Illuminated when net weight is displayed
Illuminated after weighing scale was tared
Illuminated when gross weight is displayed
HOLD function active
Illuminated while BMI function is enabled
Shows the capacity of the rechargeable / batteries
10 MWA-M-BA-e-1410
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.
MWA-M-BA-e-1410 11
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.
12 MWA-M-BA-e-1410
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.
All language versions contain a non-binding translation.
The original German is binding.
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).
MWA-M-BA-e-1410 13
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 multifunction balances MWA. Do not use these near multi-function
balances MWA. Chapter 8.4 contains details about recommended
minimum distances.
14 MWA-M-BA-e-1410
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
Emission of harmonics acc. to IEC 61000-3-2
Class B
Class A
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 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.
MWA-M-BA-e-1410 15
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
Fast transient electrical disturbances / bursts acc. to IEC 61000-4-4
Impulse voltages / surges acc. to IEC 61000-4-5
± 6 kV contact discharge
± 8 kV air discharge
± 6 kV
± 8 kV
± 2 kV for power lines
+ 1 kV for input and output lines
± 1 kV voltage
Live wire - live wire
± 2 kV voltage
Live wire - earth
± 2 kV
+ 1 kV
± 1 kV
Inapplicable
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%.
The quality of the supply voltage should match that of the typical business or hospital environment.
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
Magnetic field for supply frequency
(50/60 Hz) acc. to IEC 61000-4-8
3 A/m
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.
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.
16 MWA-M-BA-e-1410
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
Emitted HF disturbance variables
Acc. to IEC 61000-4-
3
3
150 kHz to 80 MHz
3
80 MHz to 2.5 GHz
3 V
3 V/m
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.
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. a
The 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.
MWA-M-BA-e-1410 17
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
0.01
150 kHz up to 80
MHz
0.12
80 MHz up to 800
MHz
0.12
800 MHz up to 2.5
GHz
0.23
0.1
1
10
100
0.38
1.20
3.80
12.00
0.38
1.20
3.80
12.00
0.73
2.30
7.30
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.
18 MWA-M-BA-e-1410
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-M-BA-e-1410 19
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.
20 MWA-M-BA-e-1410
10.3 Scope of delivery
Serial accessories:
• Balance
• Mains adapter (in conformity with EN 60601-1)
• 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-M-BA-e-1410 21
Assembly handrail MWA-A01 (factory option) and MWA-A02 (optional):
Fold up handrail and tripod (MWA-A01) into vertical position and fix it using both screws
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.
Note:
After fitting the attachments and before using the weighing balance, check all attachments for firm fit.
22 MWA-M-BA-e-1410
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.
Always use genuine approved KERN power pack units as per EN 60601-1 directive.
The small sticker attached to the side of the display unit indicates the power port:
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
MWA-M-BA-e-1410 23
10.6 Battery operation is possible by obtaining an optional battery power pack
1
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.
24 MWA-M-BA-e-1410
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
MWA-M-BA-e-1410 25
Insert batteries
Version A:
Remove the battery compartment cover and detach the adhesive tape carefully.
Ensure that the cables are not destroyed.
Insert contact sheet and sink the battery compartment connection into the provided opening (see fig. below)
Contact sheet
Clamp the contact sheet acc. to illustration
Insert batteries into battery compartment and lock with battery compartment cover.
26
Plug for rechargeable battery connection
Opening for rechargeable battery connection
(Should the rechargeable battery be used later, take care that the plug does not disappear in the housing)
MWA-M-BA-e-1410
Version B:
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.
MWA-M-BA-e-1410 27
10.8 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.
28 MWA-M-BA-e-1410
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.
Put an object (such as a towel, support or empty wheelchair) on the weighing pan.
(example)
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
.
MWA-M-BA-e-1410 29
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.
30 MWA-M-BA-e-1410
11.4 Display additional last decimal place
(short-time, additional decimal place)
Press and hold for about 2 s whilst weighed result is being shown. The second decimal place will be shown for approx. 5 s.
This value is not considered as verified and may not be used for the purpose of a verified balance.
11.5 Calculation of the Body Mass Index
You need to know a person’s body height before you can calculate the BMI for that person. This should be known.
11.5.1 Calculating Body Mass Index
Start balance by pressing
Wait for stability display „STABLE to appear.
Press
.
The most recently entered body height will be shown with the enable digit flashing. The BMI symbol lights up.
To enter body height, press the
and key.
Confirm entered value by
. BMI „0.0“ is displayed
Allow the person to step onto the centre of the weighing platform.
„---------„ is shortly displayed, followed by the BMI value of the person.
Unload weighing plate
Return to weighing mode using
The BMI symbol will disappear and the kg display will reappear.
MWA-M-BA-e-1410 31
• Reliable calculation of BMI is restricted to a body height of 100 cm to 200 cm and a weight of >10 kg.
• If weighing has to take place under unsteady conditions, you can be stabilise the display by applying the Hold function.
11.5.2 Classification of BMI values
Weight classification for adults over 18 years of age using the BMI in accordance with WHO, 2000 EK IV and WHO 2004.
Categorie BMI ( kg/m
2
) Risk of diseases associated with overweight
Underweight < 18.5 low
Normal weight
Overweight
Pre-adipose
Adipose degree I
Adipose degree II
Adipose degree III
18.5 – 24.9
> 25.0
25.0 – 29.9
30.0 – 34.9
35.0 – 39.9
> 40
Average
A bit high
Increased
High
Very high
32 MWA-M-BA-e-1410
11.6 Automatic switch-off function „AUTO OFF“
The weighing scale will switch off automatically after the allotted time as long as neither the display unit nor the weighing plate is operated.
• Menu settings:
[F1 oFF]
[oFF 0/3/5/15/30] (see chap. 12)
(example)
In weighing mode, press will be displayed.
Press
[oFF 15] and the first function [F1 oFF]
, the last saved time is displayed, for example,
Press
repeatedly until the desired time is displayed, e.g. [oFF 30]
(example)
[oFF 0]
AUTO OFF
- function disabled
[oFF 3]
[oFF 5]
[oFF 15]
[oFF 30]
Weighing system will be turned off after 3 min.
Weighing system will be turned off after 5 min.
Weighing system will be turned off after 15 min.
Weighing system will be turned off after 30 min.
Save selected time with
, [F1 oFF] is displayed
Return to weighing mode using
MWA-M-BA-e-1410 33
11.7 Display background illumination
• Menu settings:
[F2 bk]
[bL on / bL oFF / bL AU] see chap. (12)
In weighing mode, press will be displayed.
Press and the first function [F1 oFF]
until [F2 bk] is displayed.
Press
[bL on]
, the last saved setting is displayed, for example
To select the desired setting, press
(example)
bL on bL off bL Auto
Continuous background lighting
Background illumination off
Automatic background illumination on when weighing pate is loaded or key pressed.
With
save select setting , [F2 bk] is displayed.
Return to weighing mode using
34 MWA-M-BA-e-1410
12 Menu
Access to service menu „tCH“ is locked in verified balances.
To disable the access lock, destroy the seal and actuate the adjustment switch. For position of adjustment switch, see chap. 17.
Attention:
After destruction of the seal the weighing system must be re-verified by an authorised agency and a new verification wire/seal mark fitted before it can be reused for applications subject to verification.
12.1 Navigation in the menu
Call up menu
In weighing mode, press
oFF] will be displayed.
Select function and the first function [F1
With help of
, the individual functions can be selected one after the other.
Change settings
Confirm selected function by will be displayed.
. The current setting
Exit menu/
Return to weighing mode
Select desired setting by balance returns to the menu.
and confirm with , the
Press
, the balance will return to weighing mode.
MWA-M-BA-e-1410 35
12.2 Menu overview
Function Settings
Automatic cutout
Auto Off oFF 0* oFF 3 oFF 5 oFF 15 oFF 30 oFF*
Prt
Background illumination of display
Pr ACC
Description
Automatic shutdown off
Automatic shutdown after 3 min.
Automatic shutdown after 5 min.
Automatic shutdown after 15 min.
Automatic shutdown after 30 min.
Not documented bl on bl oFF
Back lighting for display on
Display background illumination off
Background illumination of display bl AU* Backlighting for display will come on automatically as soon as the weighing scale is operated.
1.
RS-232 mode
Interface parameter Select desired mode by
P Prt
, then confirm with .
Weight will be added to summation memory and printed after pressing PRINT
P Cont
Series
Continuous data output
Not documented
ASK
P cnt 2
Remote control instructions:
W: Send all weighing details
S: Send stable weight value
T: Taring
Z: Zeroing
Not documented
P Stab
Automatic data output of stable weighing values
P Auto Weighed result will be added automatically to summation memory and issued
2.
Baud rate
The currently set baud rate (b xxx) will be shown after the RS-232 mode was confirmed. Select desired Baudrate by pressing and confirm by pressing
. Available Baud rate: 600, 1200, 2400, 4800, 9600
36 MWA-M-BA-e-1410
3.
Data output format
(Setting P Prt, P Auto, P Cont only!)
The currently set data output format will be displayed after the Baud rate has
. been confirmed. Select desired format by and confirm with
Data output format, see chap. 13 Prt 0-3
Cont 1 Default
Sd0 – on/off
Continuous data output, selectable “Sending 0” yes / no
Cont 2 Not documented
Cont 3 Not documented
4.
Printer type
The currently set printer type will be displayed after the data output format has been confirmed.
Select desired printer type by pressing
LP 50 tPUP
Not documented
Use this setting
and confirm with .
Service menu
Display speed
Pin
Password Input: press ,
Operate adjustment switch; for position see chap.15
,
15*
30
60
7.5
Not documented subsequently.
Adjustment, see chap. 18 tri*
CoUnt rESEt
SEtGrA
Not documented
Not documented
Reset weighing scale to factory setting
Not documented
MWA-M-BA-e-1410 37
13 Data output RS 232
You can print weighing data automatically via the RS 232 interface or manually by pressing via the interface according to the setting in the menu.
This data exchange is asynchronous using ASCII - Code.
The following conditions must be met to provide successful communication between the weighing balance and the printer.
• Use a suitable cable to connect the weighing balance to the interface of the printer. Faultless operation requires an adequate KERN interface cable.
• Communication parameters (baud rate, bits and parity) of balance and printer must match. For detailed description of interface parameters see chap. 13.2)
13.1 Pin allocation of balance output bushing:
13.2 Technical data
Connection 9 pin d-subminiature bushing
Baud rate
Pin 2 output
Pin 3 input
Pin 5 signal earth
Optional 600/1200/2400/4800/9600
Parity 8 bits
Pin 2: TXD - output
Pin 3: RXD - input
Pin 5: GND - signal ground
38 MWA-M-BA-e-1410
13.3 Printer operation
Printout examples:
Prt
0 / 2
60.0kg
1 / 3
60.0kg
170.0cm
20.7BMI
14 Error messages
Display
Description
Zero range exceeded
(on start-up or when pressing the
• Load on weighing pan
key)
• Excess load, during zero setting of weighing scale
• Incorrect adjusting process
• Fault on load cell
Value outside the A/D converter range
• Damaged weighing cell
• Damaged electronics
Should other error messages occur, switch balance off and then on again. If the error message remains inform manufacturer.
MWA-M-BA-e-1410 39
15 Servicing, maintenance, disposal
15.1 Cleaning
Before any maintenance, cleaning and repair work disconnect the appliance from the operating voltage.
15.2 Cleaning / disinfecting
Clean weighing platform (such as seat) as well as casing with household detergents or commercially available disinfectants. Please follow manufacturer’s instructions.
Do not use abrasive or aggressive cleaners such as spirits or alcohol or similar as they might damage the high-quality surface.
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).
Do not spray disinfectants onto appliance.
Make sure that disinfectant does not penetrate the interior of the appliance.
Remove dirt immediately.
15.3 Servicing, maintenance
The appliance may only be opened by trained service technicians who are authorized by KERN.
Disconnect the scales before opening.
15.4 Disposal
Disposal of packaging and appliance must be carried out by operator according to valid national or regional law of the location where the appliance is used.
40 MWA-M-BA-e-1410
16 Instant help
In case of an error in the program process, briefly turn off the balance and disconnect from power supply. The weighing process must then be restarted from the beginning.
Fault Possible cause
The displayed weight does
• The balance is not switched on. not glow.
• The mains supply connection has been interrupted (mains cable not plugged in/faulty).
• Power supply interrupted.
• Rechargeable battery inserted incorrectly or empty
• No rechargeable battery inserted permanently changing
• Table/floor vibrations
• The weighing plate is in contact with foreign bodies or is not correctly positioned.
• Electromagnetic fields / static charging (choose different location/switch off interfering device if possible) obviously incorrect
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Warm-up time was ignored.
• Electromagnetic fields / static charging (choose different location/switch off interfering device if possible)
Should other error messages occur, switch balance off and then on again. If the error message remains inform manufacturer.
MWA-M-BA-e-1410 41
17 Verification
General introduction:
According to EU directive 2009/23/EC balances must be officially verified if they are used as follows (legally controlled area): a) For commercial transactions if the price of goods is determined by weighing. b) For the production of medicines in pharmacies as well as for analyses in the medical and pharmaceutical laboratory. c) For official purposes d) For manufacturing final packages
In cases of doubt, please contact your local trade in standard.
Verification notes:
An EU type approval exists for balances described in their technical data as verifiable. If a balance is used where obligation to verify exists as described above, it must be verified and re-verified at regular intervals.
Re-verification of a balance is carried out according to the respective national regulations. For verification validity period, s. chap. 17.1.
The legal regulation of the country where the balance is used must be observed!
Verification of the balance is invalid without the seal.
The seal marks attached on balances with type approval point out that the balance may only be opened and serviced by trained and authorised specialist staff. If the seal mark is destroyed, verification looses its validity.
Please observe all national laws and legal regulations. In Germany a reverification will be necessary.
Balances with obligation to verify must be taken out of operation if:
•
•
The weighing result of the balance is outside the error limit. Therefore, in regular intervals load balance with known test weight (ca. 1/3 of the max. load) and compare with displayed value.
The reverification deadline has been exceeded.
42 MWA-M-BA-e-1410
Position adjustment switch and seals
1
1
2
3
1. Self-destroying seal mark
2. Cover
3. Adjustment switch
MWA-M-BA-e-1410 43
17.1 Verification validity period (current status in G)
Multi-function balances (including chair and wheelchair scales) in hospitals
Multi-function balances, when not located in hospitals (for example, doctor's offices and nursing homes)
4 years unlimited
Baby weighing scales and mechanical birth weight scales
Bed scales
4 years
2 years
Scales in dialysis stations unlimited
Rehab clinics and health authorities are treated as hospitals
(4 years of verification validity)
Not treated as hospitals (verification validity not limited) are dialysis stations, nursing homes and doctor’s surgeries.
(Data source : ”Bureau of Standards News, Weighing Instruments in Medicine“}
44 MWA-M-BA-e-1410
18 Adjustment
As the acceleration value due to gravity is not the same at every location on earth, each display unit with connected weighing plate must be coordinated - in compliance with the underlying physical weighing principle - to the existing acceleration due to gravity at its place of location (only if the weighing system has not already been adjusted to the location in the factory). This adjustment process must be carried out for the first commissioning, after each change of location as well as in case of fluctuating environment temperature. To receive accurate measuring values it is also recommended to adjust the display unit periodically in weighing operation.
• Prepare the required adjustment weight. The adjustment weight to be applied depends on the capacity of a weighing scale, see chap. 1.
Carry out adjustment as closely as possible to admissible maximum load of weighing scale. Info about test weights can be found on the
Internet at: http://www.kern-sohn.com.
• Observe stable environmental conditions.
For warm-up time required for stabilisation see chap. 1.
Access to service menu „tCH“ is locked in verified balances.
To disable the access lock, destroy the seal and actuate the adjustment switch. Position of the adjustment switch see chap. 16.
Attention:
After destruction of the seal the weighing system must be re-verified by an authorised agency and a new verification wire/seal mark fitted before it can be reused for applications subject to verification.
Procedure:
In weighing mode, press
Press
, [Pin] is displayed repeatedly until [tCH] appears.
MWA-M-BA-e-1410 45
Press appear
, and one after the other, [P1 SPd] will
Press
, „P2 CAL“ will be displayed
Operate adjustment switch; for position see chap.16
Press
, [dESC] is displayed
(example)
Press repeatedly until [CAL] will be displayed.
Confirm with
, [UnloAd] appears
Ensure that there are no objects on the weighing pan.
Wait for stability display "STABLE", then confirm with
The size of the currently set adjustment weight will be displayed.
, and the To change, select the digit to be altered by numerical value by .
Confirm with
, [LoAd] appears.
46 MWA-M-BA-e-1410
Place adjustment weight in the centre of the weighing pan
Wait until stability display „STABLE“ appears
Confirm with
[PASS] is displayed.
The balance carries out a selftest, after that [Err19] will be displayed and a signal will sound.
Switch off the balance
Take away adjustment weight
Turn on balance again, after the selftest the balance changes into the weighing mode. Adjustment has now been completed successfully.
MWA-M-BA-e-1410 47
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