MCD 300K-1 - Scale Kern - Free user manual and instructions

Product type	Medical chair scale
Brand	Kern
Model	MCD 300K-1
Maximum capacity	300 kg
Readability	0.1 kg
Reproducibility	0.1 kg
Linearity	±0.1 kg
Weighing units	kg
Power supply	6 batteries 1.5 V AA
Dimensions (W x D x H)	625 x 990 x 985 mm
Weighing platform dimensions	500 x 360 x 370 mm
Net weight	20 kg
Operating temperature	+10°C to +40°C
Maximum humidity	80 % (non-condensing)
Functions	Weighing, tare, HOLD function, BMI calculation, adjustable auto-off
Display	LCD with symbols (GROSS, NET, ZERO, STABLE, BMI, HOLD, battery)
Maintenance	Cleaning with non-corrosive disinfectant (e.g. 70% isopropanol)
Safety	Wheel locking brakes, do not use for transport, avoid overload
Compliance	EU/EC declaration available online
Warranty	According to terms of the manual (excluding misuse, opening, fall)
Included accessories	Assembled scale, user manual

Frequently Asked Questions - MCD 300K-1 Kern

How to set up the MCD 300K-1 scale?

Place the scale on a flat, solid surface. Insert 6 AA 1.5V batteries into the compartment under the display. Turn on with the ON/OFF button. The display shows '0.0 kg' after the self-test. The scale is ready.

How to use the tare function?

Place an object (e.g. towel) on the seat, then press the TARE button. The display returns to zero and the 'NET' symbol appears. The scale then subtracts the weight of the object. To clear the tare, unload the scale and press TARE again.

What is the HOLD function and how to activate it?

The HOLD function stabilizes the display if the person moves. Turn on the scale, wait for 'STABLE', then press HOLD. The 'HOLD' symbol appears. Have the person sit down. After stabilization, the value is 'frozen' and remains displayed for 10 seconds after unloading.

How to calculate the body mass index (BMI)?

Have the person sit, wait for 'STABLE', then press BMI. The last stored height flashes. Adjust the height with the arrow keys (←/↑) and confirm with BMI. The 'BMI' symbol appears with the calculated BMI. Press TARE to return to weighing mode.

How to adjust the automatic shutoff?

Turn on the scale, then during the self-test press the F (function) button until 'F3 oFF'. Press BMI to see the current setting (e.g. 3min). Use F to choose 3, 5 or 15 min, then confirm with BMI. Press TARE to exit the menu.

What to do if the display shows 'OL' or '----'?

'OL' means overload: remove the load, turn off the scale and adjust if necessary. '----' indicates insufficient load: unload, turn off and readjust. If the problem persists, contact the manufacturer.

How to clean and disinfect the scale?

Disconnect the power supply. Use a soft cloth with household detergent or a disinfectant like 70% isopropanol. Avoid corrosive products (alcohol, benzene) that could damage the surfaces.

When should the batteries be replaced?

The battery symbol lights up when the capacity is exhausted. Replace the 6 AA batteries by opening the compartment at the back of the display. Use 1.5V batteries. The scale automatically shuts off to save energy.

How to calibrate the scale?

Place a 300 kg calibration weight (class M1) on the scale. Turn on and press F during the test to access 'F0 CAL'. Follow the on-screen instructions: confirm 'ULOAD', then load the weight, wait for stability and confirm. Calibration is complete when 'F0 CAL' reappears.

Can I transport the scale with a person seated?

No, the medical chair scale must not be used to transport people. Before each weighing, lock the wheel brakes to ensure stability and safety.

USER MANUAL MCD 300K-1 Kern

Operating manual Chair scale

White mobile medical mobility chair with black seat and wheels, no visible text or symbols

Further language versions you will find online under www.kern-sohn.com/manuals

Technical diagram of a device with labeled parts including a digital display and internal wiring, shown from top and side views.

Close-up of a mechanical cuestioner with a white shaft and gray wheels (no text or symbols visible)

Feststellbremse

Close-up of white industrial stairs with black and white mechanical components (no text or symbols visible)

Fußstützen

White and black mobility chair with adjustable armrest and wheels (no text or symbols visible)

KERN MCD TARE →0← F BMI HOLD ON OFF

Three pictograms showing a person in different positions: one on a walker, one on a cart, and one on a push-up, each with a red prohibition sign.

Close-up of a mechanical device with blue and white wheels and a white cylindrical component (no visible text or symbols)

Interior view of a white electronic device showing internal components and wiring (no text or symbols visible)

2 Declaration of conformity .... 3

3 Appliance overview 4

3.1 Overview of display....6

3.2 Keyboard overview 7

4 Basic Information (General)....8

4.1 Proper use 8

4.2 Improper Use 9

4.3 Warranty 9

4.4 Monitoring of Test Resources 9

5 Basic Safety Precautions.... 10

5.1 Pay attention to the instructions in the Operation Manual 10

6 Transport and storage.... 10

6.1 Testing upon acceptance....10

6.2 Packaging / return transport....10

7 Unpacking, Setup and Commissioning 11

7.1 Place of installation / place of operation....11

7.2 Unpacking....11

7.3 Scope of delivery 11

7.3.1 Roller 12

7.3.2 Levelling 12

7.4 Battery operation 13

8 Operation.... 14

8.1 Weighing....14

8.2 Taring 15

8.3 HOLD function 15

8.4 Calculation of the Body Mass Index....16

8.4.1 Classification of BMI values 17

8.5 Automatic switch-off function „Auto Off“ 17

9 Menu 18

9.1 Navigation in the menu....18

9.2 Menu overview....19

10 Error messages.... 20

11 Servicing, maintenance, disposal 20

11.1 Cleaning 20

11.2 Cleaning / disinfecting....21

11.3 Servicing, maintenance....21

11.4 Disposal....21

12 Instant help.... 21

13 Adjustment 22

2 MCD-BA-e-1710

1 Technical data

KERN	MCD 300K-1
Readability (d) 0.1 kg
Weighing range (max) 300 kg
Reproducibility 0.1 kg
Linearity ± 0.1 kg
Recommended adjustment weight (Class)	300 kg(M1)
Weighing Units kg
Warm-up time 10 min
Electric Supply	Battery: 6 x 1.5 V AA
Operating temperature	+10°C ... + 40°C
Humidity of air	max. 80 % (not condensing)
Dimensions (B x D x H) mm	625 x 990 x 985
Dimensions Weighing surface	500 x 360 x 370
Weight kg (net)	20

2 Declaration of conformity

The current EC/EU Conformity declaration can be found online in:

www.kern-sohn.com/ce

3 Appliance overview

Technical diagram of a device with labeled parts including a digital display and internal wiring, shown in two views.

1. Seat pan
2. Bubble level
3. Display Unit
4. Manipulations
5. Parking brake
6. Adjustment switch

7. Battery compartment

8. Connection cable "Display - Chair"

Details:

Close-up of a mechanical cuestioner with wheels and handle (no text or symbols visible)

Parking brake

(please lock at every weighing process)

Close-up of white and black mechanical legs with attached wheels, no visible text or symbols

Foot rests

White and black mobile phone chair with adjustable armrest and wheels (no text or symbols visible)

Folding arm rests

3.1 Overview of display

W1 W2 DRINK PT BMI HOLD M1 M2 M3 M4 STABLE ZERO cm ZERO inch -8.8.8.8.8 lb TARE NET kg GROSS kg

Display	Designation	Description
GROSS	Gross weight display	Lights up during indication of the gross weight
NET	Net weight display	Lights up during indication of the net weightIlluminated after weighing scale was tared
ZERO	Zeroing display	Should the balance not display exactly zero despite empty scale pan, press the button. Your balance will be set to zero after a short standby time.
STABLE	Stability display	Scales are in a steady state
BMI	Body Mass Index	Is actively displayed during active BMI function
HOLD	HOLD function	Is displayed with active hold functionLights when the voltage drops below the prescribed minimum.
	Battery symbol	Lights when the battery capacity is almost exhausted.Lights when the battery is fully charged.

3.2 Keyboard overview

KERN MCD TARE →0← F BMI HOLD ON OFF

Button Designation Function

ON/OFF button Turn on/off

HOLD button Hold function

BMI key Calculation of the Body Mass Index

In 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

Zero setting key Weighing scale will be reset to „0.0“

For numeric entry:

- Change decimal place

TARE key Tare balance

4 Basic Information (General)

4.1 Proper use

These scales are used to determine weight of people sitting at rest,

The person should be weighed carefully and have contact with the center of the seat, sit and stay calm.

As soon as a stable weighing value is reached the weighing value can be read.

The scales are designed for long-term usage.

Determination of the body weight.

Use as „non-standalone weighing scale“, that is, a person sits carefully onto the seating surface’s centre. Once a steady display value is shown, you can read the weight value.

The instruments shall only be used by people who can sit still.

The balances should be checked for correct condition prior to each utilisation by a person familiar with proper operation of the balance.

Three pictograms showing a person in a wheelchair, a crossed-out person, and a crossed-out person on a stroller, all marked with red prohibition signs.

• As long as the person is sitting on the chair scales, the wheel brakes must be locked without fail.
• Do not step onto the foot rests when stepping or leaving the chair scales!
• The chair scales may not be used for the transport of people!

4.2 Improper Use

Do not use these scales for dynamic weighing processes.

No permanent load on the seat area. This may damage the measuring system.

Impacts and overloading exceeding the stated maximum load (max) of the seating surface, 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 anesthetics and oxygen or laughing gas may occur.

Do not modify the construction of the scales. This may lead to incorrect weighing results, safety-related faults and destruction of the balances.

The balances may only be used according to the described conditions. Other areas of use must be released by KERN in writing.

The balance cannot be used to determine a body weight in practice of medicine.

4.3 Warranty

Warranty claims shall be voided in case

• Our conditions in the operation manual are ignored
  ■ The appliance is used outside the described uses
  ■ Modification or opening of appliances
  ■ 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 of scales

4.4 Monitoring of Test Resources

In the framework of quality assurance the measuring-related weighing properties of the balances 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.

5 Basic Safety Precautions

5.1 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.

6 Transport and storage

6.1 Testing upon acceptance

When receiving the appliance, please check packaging immediately, and the appliance itself when unpacking for possible visible damage.

6.2 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 against shifting and damage.

7 Unpacking, Setup and Commissioning

7.1 Place of installation / place of operation

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. In that case, the location must be changed.

7.2 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.

7.3 Scope of delivery

■ Balance, completely assembled
- Operating manual

7.3.1 Roller

Close-up of a mechanical device with blue wheels and a white cylindrical component (no visible text or symbols)

Check regularly if these nuts (1) are securely tightened and the brakes/wheels are in good working order.

7.3.2 Levelling

→ Level balance with foot screws until the air bubble of the water balance is in the prescribed circle.
→ Check levelling regularly.

7.4 Battery operation

Interior view of a white electronic device casing with visible wiring and mounting holes (no text or symbols)

Open battery compartment cover at the lower side of the display unit and insert 6 x 1.5 V AA- batteries according to the example below. Lock again the battery compartment cover. If the batteries are empty, in the balance display appears the symbol . Change batteries. To save the battery, the balance switches off automatically.

Capacity of batteries exhausted.

Batteries will soon be flat.

Batteries completely loaded

Insert batteries:

Remove battery compartment cover
Connect battery retainer as per illustration to the contact of the housing
Insert battery retainer

Insert batteries in the battery container and lock it with battery compartment cover.

8 Operation

8.1 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

→ Seat person in the centre of the seat pan.
⇒ Fold down the foot rests and place the patient's feet on the respective foot rest.
→ Wait for stability display "STABLE", then read the weighing result.
→ Once the weighing process is completed fold up the foot rests.

- If a person is heavier than the maximum weighing range, "OL" (overload) will appear on the display screen.

8.2 Taring

The tare weight of any preloads can be deducted by pressing a button so that the actual weight of the person is displayed in subsequent weighings.

(example)

⇒ Put object (such as towel or padding) on the seating pan.

(example)

⇒ Press , the zero display appears.

⇒ „NET” is shown at the bottom on the left.

Seat person in the centre of the seat pan. 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, unload the balance and press

8.3 HOLD function

The balance has an integrated standstill function (mean value calculation). This allows correct weighing determination of a person although the latter is not keeping still on the seat surface.

→ Start balance by pressing OFF Wait for stability display „STABLE to appear.

⇒ Press , in the display „----“ will appear and the „HOLD“ symbol appears.

→ Have person sit in the centre of the chair.

⇒ After a short time the stability display „STABLE“ appears and the weighing value of the person is displayed and „frozen“.

(example)

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.

i

There is no average value calculation in the event of too much movement.

8.4 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.

→ Start balance by

⇒ Allow the person to sit onto the chair

→ Wait for stability display „STABLE to appear.

→ Press

The most recently entered body height will be shown with the enable digit flashing.

⇒ To enter body height, press the

→ Confirm the value entered with

The weighing scale is now in BMI mode and the BMI symbol will be appear and the kg display disappear.

The calculated BMI value will be displayed.

→ Return to weighing mode using

The BMI symbol will disappear and the kg display will reappear.

• 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.

8.4.1 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	18.5 – 24.9	Average
Overweight	≥ 25.0
Pre-adipose	25.0 – 29.9	A bit high
Adipose degree I	30.0 – 34.9	Increased
Adipose degree II	35.0 – 39.9	High
Adipose degree III	≥ 40	Very high

8.5 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 surface is operated.

F0 CAL F3 OFF 3MIN (example) 15MIN (example) F3 OFF Switch-on balance by ON OFF and during the selftest press [F0 CAL] is displayed. Press F repeatedly until [F3 oFF] is shown. Press BMI last saved time is displayed, for example, [3min] Select desired time with F e.g. [15min] Save selected time with BMI, [F3 oFF] is displayed Return to weighing mode using TARE

[oFF 3]	Weighing system will be turned off after 3 min.
[oFF 5]	Weighing system will be turned off after 5 min.
[oFF 15]	Weighing system will be turned off after 15 min.

9 Menu

9.1 Navigation in the menu

Call up menu	⇒ In weighing mode, press F and the first function [F1 oFF] will be displayed.
Select function	⇒ With help of F, the individual functions can be selected one after the other.
Change settings	Confirm selected function by . The current setting will be displayed.Select desired setting by and confirm with the balance returns to the menu.
Exit menu/Return to weighing mode	Press, the balance will return to weighing mode.

9.2 Menu overview

Function	Settings	Description
F0 CALAdjustment		Adjustment
F1 CAP	d 0, d 0.0, d 0.00,d 0.000, d 0.0000	Capacity
F3 OFFAutomatic cutoutAuto Off	oFF 3	Automatic shutdown after 3 min.
	oFF 5	Automatic shutdown after 5 min.
	oFF 15	Automatic shutdown after 15 min.
F4 GRAGravity		Gravity
F5 COM	not documented

10 Error messages

Display

Description

Zero range exceeded

(on start-up or when pressing the 0 key)

• Load on weighing pan
• 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

Unable to initialise zero point

• Measuring cell defective / overloaded
- Object on weighing pan / contact
• Transport safety device has not been removed
- Main board defective

OL or ----

Overload

- Unload, switch off and adjust the balance

----or „0“

Underload

- Unload, switch off and adjust the balance

Should other error messages occur, switch balance off and then on again. If the error message remains inform manufacturer.

11 Servicing, maintenance, disposal

11.1 Cleaning

Before any maintenance, cleaning and repair work disconnect the appliance from the operating voltage.

11.2 Cleaning / disinfecting

Clean weighing platform (such as seat pan) as well as casing with household detergents or commercially available disinfectants, e.g. 70% isopropanol. We recommend a disinfectant suitable for wiping disinfection. 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.

11.3 Servicing, maintenance

The appliance may only be opened by trained service technicians who are authorized by KERN.

Disconnect the scales before opening.

11.4 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.

12 Instant help

In case of a fault in the program sequence, the balance should be shortly switched off. The weighing process must then be restarted from the beginning.

Failure:	Possible causes:
The displayed weight does not glow.	The balance is not switched on.The mains supply connection has been interrupted (mains cable not plugged in/faulty).Power supply interrupted.Battery inserted incorrectly or empty.No battery inserted.
The displayed weight is permanently changing	Draught/air movementTable/floor vibrationsThe seating surface is in contact with foreign bodies or is not correctly positioned.Electromagnetic fields / static charging (choose different location/switch off interfering device if possible)

The weighing result is obviously incorrect

■ The display of the balance is not at zero.
■ Adjustment is no longer correct.
- Great fluctuations in temperature.
■ The balance is on an uneven surface.
- 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.

13 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 chpt 1.

Procedure:

	⇒
	⇒ Press [CAL] will be displayed
	⇒ Press again, [ULOAD] will be displayed.
	→ Wait for stability display, then press , an adjustment weight will be displayed. The right digit flashes. Or confirm
	→ Place a corresponding adjustment weight, wait for stability display and confirm by
	→ [----] will be shortly displayed, followed by [F0 CAL] The adjustment is now finished. Should an error occur, repeat adjustment.

KERN MCD

Version 1.0 2017-10

Close-up of a metallic and gray industrial-style vehicle wheel with a handle (no text or symbols visible)

Close-up of a white bicycle pedal mechanism with black and gray components, no visible text or symbols

Repose-pieds

White and black medical mobility chair with adjustable armrest (no text or symbols visible)

KERN MCD TARE →0← F BMI HOLD ON OFF

Close-up of a mechanical device with blue wheels and a white cylindrical component (no visible text or symbols)

Interior view of a white electronic device casing showing internal components and wiring (no text or symbols visible)

Interior view of a battery pack with four different colored batteries (no visible text or symbols)

8 Fonctionnement

8.1 Pesage