KERN VHB Operating Instruction

KERN & Sohn GmbH

Ziegelei 1

D-72336 Balingen

E-Mail: [e-mail]

Tel: +49-[0]7433- 9933-0

Fax: +49-[0]7433-9933-149

Internet: www.kern-sohn.com

Operating instruction
Pallet truck scale

KERN VHB

Version 1.4
2018-03
GB

VHB-BA-e-1814

VHB-BA-e-1814

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GB

KERN VHB

Version 1.4 2018-03

Operating instruction

Pallet truck scale

Table of Contents

1 Technical data ................................................................................................... 4

2 Declaration of conformity ................................................................................. 5

3 Basic instructions for scales ............................................................................ 6

3.1 Proper use ................................................................................................................................. 6

3.2 Improper Use ............................................................................................................................ 6

3.3 Warranty .................................................................................................................................... 6

3.4 Monitoring of Test Resources ................................................................................................. 7

4 Basic safety instructions for scales ................................................................ 7

4.1 Pay attention to the instructions in the Operation Manual .................................................. 7

4.2 Personnel training .................................................................................................................... 7

5 Transport and s torage ...................................................................................... 7

5.1 Testing upon acceptance ........................................................................................................ 7

5.2 Packaging .................................................................................................................................. 7

6 Unpacking, S etup and Commis sioning ........................................................... 8

6.1 Site of installation, place of operation for scales ................................................................. 8

6.2 Scope of delivery ...................................................................................................................... 9

6.3 Battery operation ...................................................................................................................... 9

6.4 Commissioning ......................................................................................................................... 9

6.5 Overview of display ................................................................................................................ 10

6.6 Keyboard overview ................................................................................................................. 11

7 Functions of dis play unit ................................................................................ 12

7.1 Prior to weighing: ZERO-POINT CHECK .............................................................................. 12

7.2 Gross weighing ....................................................................................................................... 12

7.3 Net weighing: TARING BY PRESSING A BUTTON .............................................................. 12

7.4 Net weighing: MANUAL TARE INPUT ................................................................................... 12

7.5 Addition of individual weighings .......................................................................................... 14

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8 S ervice, maintenance, dis pos al ..................................................................... 15

8.1 Cleaning .................................................................................................................................. 15

8.2 Service, maintenance ............................................................................................................. 15

8.3 Disposal ................................................................................................................................... 15

9 Error mes sages ............................................................................................... 15

10 Ins tant help ................................................................................................... 16

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1 Technical data

KERN VHB 2T1

Readability (d) 1 kg
Weighing range (max) 2000 kg
Reproducibility 1 kg
Linearity ± 2 kg
Stabilization time 3 sec.

Allowable ambient
temperature

-10° C .... + 40° C

Humidity of air

max. 95 % (not condensing)

Weighing Units

kg, lb

Electric Supply

4 x 1.5V AA batteries

Operating time 80 h/approx.1700 weightings

Auto Off

3 min

Net weight

125 kg

Dimensions:

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2 Declaration of conformity

To view the current EC/EU Declaration of Conformity go to:

www.kern-sohn.com/ce

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3 Basic instructions for scales

3.1 Proper use

The balance you purchased is intended to determine the weighing value of material
to be weighed. It is intended to be used as a “non-automatic“ balance, i.e. the
material to be weighed is manually and carefully placed in the centre of the weighing
plate. As soon as a stable weighing value is reached the weighing value can be read.

3.2 Improper Use

Do not use balance for dynamic weighings. In the event that small quantities are
removed or added to the material to be weighed, incorrect weighing results can be
displayed due to the “stability compensation“ in the balance. (Example: Slowly
draining fluids from a container on the balance.)
Do not leave permanent load on the weighing plate. This may damage the measuring
system.
Impacts and overloading exceeding the stated maximum load (max) of the balance,
minus a possibly existing tare load, must be strictly avoided. Balance may be
damage by this.
Never operate balance in explosive environment. The serial version is not explosion
protected.
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.

3.3 Warranty

Warranty claims shall be voided in case

• Our conditions in the operation manual are ignored

• The appliance is used outside the described uses

• 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

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3.4 Monitoring of Test Resources

In the framework of quality assurance the measuring-related 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.

4 Basic safety instructions for scales

4.1 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.

4.2 Personnel training

The appliance may only be operated and maintained by trained personnel.

5 T ransport and storage

5.1 Testing upon acceptance

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

5.2 Packaging

Keep all parts of the original packaging in case you need to return the appliance.
Only use original packaging for returning.
Before sending, disconnect all connected cables and loose/movable parts.

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6 Unpacking, Setup and Commis si oning

6.1 Site of installation, place of operation for scales

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.

Therefore, observe the following for the installation site:

 The load must be lifted clear of the display unit’s case and other pallets.

Incorrect lifting of a load

Correct lifting of a load

 The accuracy of the weighing system is falling by approximately 0.1 % per

degree if there is a slant of more than 2°. Holes and unevenness, too, have
this effect. A smooth floor is ideal.

 Optimum accuracy in weighing results is achieved if the load centre is

between the forks. The forks are easily bent and twisted when the load is off­centre. This may result in diminished accuracy. In verifiable models off-centre
loads, or slants affecting accuracy, activate the inclination switch which in turn
disconnects the displa y.

Non-optimal positioning of load

Optimal positioning of load

 Temperature range: The maximum deviation for 0.1% of the weighed load is

between -10 and +40°C. Outside this temperature range deviations of up to

0.3% may occur.

 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 (co nd ens a ti on o f air humidi ty 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.

 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.

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6.2 Scope of delivery

Standard accessory:

• Pallet truck scale

• 4 x 1.5V AA batteries

• Operating Manual

6.3 Battery operation

To change the batteries, unscrew and take off the cover of the battery compartment
at the back of the display unit. Replace the used batteries with new ones (4 x 1.5V
AA batteries) (Pay attention to correct polarity) and reinsert the battery cover.
In order to save the battery, the balance switches automatically off after 3 minutes
without weighing.
Used batteries are indicated by “LO-BA“, on the display. Change the batteries
immediately.
If the balance is not used for a longer time, take out the batteries and store them
separately. Leaking battery liquid could damage the balance.

6.4 Commissioning

To activate the weighing system, press the key.
The operating temperature for the electronic system and the weighing cells will have
been reached after three to five minutes. . Prior to this, deviations of c. 0.3% are
possible.

Loads should not be lifted before this zero adjust is complete.

ON/ OFF

UNIT

Cover battery compartment

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6.5 Overview of display

THE DISPLAY

The three displays provide the following information:

◄

The weighing system (incl. load) is stable

▬

The indicated weight has a negative value

NET

◄

The indicated value is a net weight

DISPLAY- MESSAGES

The following messages may appear on the display:

HELP 1

Weighing system overloaded

HELP 2

Taring impossible due to negative gross weight

HELP 3

Negative signal of load cells to A-D converter / slant

HELP 4

Entered tare weight is too high. Press the

key again in order to

cancel the HELP display and enter a new, reduced tare weight.

HELP 7

The signal of the load cells on the A-D converter is too high.

LO-BA

The storage battery status is too low; charge storage battery.

PRE-

TARE

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6.6 Keyboard overview

Each key provides an operating as well as an input function.

Operating function

TARE

Zero setting and
automatic tare

Confirm and enter numeric

values. Shifts the flashi ng dig it s
to the left

PRE-

TARE

Input of tare

Entering numeric values:

Decreases the numeric value of
flashing digit by 1.

TOTAL

Adding

Entering numeric values:

Increases the numeric value of
flashing digit by 1.

ON/ OFF

UNIT

On / Off

Delete

IMPORTANT

The actuation of a key will only be accepted if the load is stable and the message
“load stable” is lit up. The display unit only carries out functions as long as the load is
stable.

WARNING

If the weighed weight exceeds the set maximum, the display will show: “ERRO2”. To
prevent damage to the display unit or the weighing cells, please lighten the load of
the weighing system instantly.

SLANT

The verifiable model of the weighing system will display stripes only if a slant
exceeds 2°. If this is the case, place the weighing system on an even base.

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7 Functions of display unit

7.1 Prior to weighing: ZERO-POINT CHECK

Prior to each weighing process ensure that the system is unloaded and clear of
obstructions. The display unit provides automatic zero adjustment. This means, that
small deviations from the zero-point are corrected automatically. If the display unit
does not correct the zero-point automatically you will have to carry out a manual

correction with the help of the key.

7.2 Gross weighing

After the load was lifted, the display shows the gross value of the weighed weight.

7.3 Net weighing: TARING BY PRESSING A BUTTON

The display unit offers an option that allows tare weights to be reset to zero by
pressing a button. In this way net weight changes can be traced. After taring, the
display unit will once again start at the smallest display step.

 Lift the load.
 Press button

 The display unit shows zero.
 The lit up display “NET“, indicates that a tare weight is active.

 Loading and unloading the net load.

 The net value for the weighed weight is shown on the display.
 For unloading this will be a negative value.

 The system reverts to standard weighing mode when a zero adjustment is carried

out in an unloaded state.

7.4 Net weighing: MANUAL TARE INPUT

You may enter the tare weight at any time, that is, regardless whether the scales are
in a loaded or unloaded state. To achieve higher accuracy, a tare weight with a
higher resolution may be entered, regardless of the size of the weight and the display
steps of the indicator.

 Press button

 The most recently used tare value appears.
 The segment on the right is flashing.

 Press t he key for three seconds if the indicated tare value is to be used again

or

TARE

TARE

PRE­TARE

TARE

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 Press button
 Press the numeric up or down key until the flashing number has reached

the desired value.

 T o move to the next segment, press the key
 Repeat this action until the display shows the desired tare value.

 T o activate the tare weight (but not for storing): Press the key for three

seconds, to confirm the value.

 The tare weight is now activated.
 “NET” appears.
 If the system is loaded at this moment, the net value of the weighed weight

appears on the display.

 If the system is unloaded, the system indicates the entered tare value negative.
 The entered value remains active until the weighing system is turned off, a new

tare weight entered, a new load tared (See 7.3.) or if a reset to zero is carried
out:

 T he weighing system is loaded: Press the key for two seconds. The tare

value will be reset to zero and the system reverts to standard weighing mode.

or

 T he weighing system is unloaded: Press button A reset to zero is

carried out and the system reverts to standard weighing mode.

 T o activate and store the tare weight: Confirm all segments by pressing the

key.

 The tare weight is now activated and stored.
 “NET” appears.
 If the system is loaded at this moment, the net value of the weighed weight

appears on the display.

 If the system is unloaded, the entered tare value is shown negative.
 The entered value remains active even after the system was turned off, until a

new tare weight is entered, a new load tared (See 7.3.) or a reset to zero is
carried out.

 T he weighing system is loaded: Press the key for two seconds. The tare

value will be reset to zero and the system reverts to standard weighing mode.

or

 T he weighing system is unloaded: Press button. A reset to zero is carried

out and the system reverts to standard weighing mode.

PRE­TARE

TOTA L

PRE­TARE

TARE

TARE

PRE­TARE

TARE

TARE

PRE­TARE

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7.5 Addition of individual weighings

The display unit offers an option that allows the addition of weighings and the display
of the total weight. When the tare weight is active, the net weight is automatically
added up.

 Loading the system with the load to be added
 To add the weighed weight to the memory, press the key.

 The displayed value is stored and simultaneously added to the summation

memory.

 The display alternately shows consecutive numbers (number of weighings) and

the total value (summation memory).

 If the weighing system has been equipped with a printer, the value shown is

printed at the same time (KERN VHS).

 After a few seconds the system automatically reverts to standard weighing

mode.

or

 T o read the total weight calculated so far, press the key for three seconds.

 The display alternately shows the consecutive numbers (number of weighings)

and the total.

 After a few seconds the system automatically reverts to standard weighing

mode.

 Whilst the total value is displayed, you may delete the memory by pressing the

key.

 If the system is equipped with a printer, an overview print is made (KERN VHS)
 The display shows the sequence number 00 and the initial value 0.0 kg.
 The system automatically reverts to standard weighing mode.

Important:

 Please note that the balance must be unloaded between the individual weighing

procedures.

 Additional summation is also possible after the scales were turned on or off. The

stored values are kept after the scales were turned off.

TOTA L

TOTA L

TOTA L

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8 Service, maintenance, disposal

8.1 Cleaning

Please do not use aggressive cleaning agents (solvents or similar agents), but a
cloth dampened with mild soap suds. Ensure that no liquid penetrates into the device
and wipe with a dry soft cloth.

8.2 Service, maintenance

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

The same maintenance guidelines apply to the chassis of the mobile weighing
system as those for simple manual pallet trucks. Experience has taught us that the
integrated weighing system continues to function even if the chassis was damaged
by overloading.

General rules:

 As the steering wheels are mounted at the front, it is better to pull rather than

push the manual pallet truck.

 If the lifting device is not used, the manual lever should be left in centre

position. This prolongs the life span of the seals.

 To prevent damages to the electronic system and weighing cells it is

necessary that welding work on the entire weighing system is carried out
exclusively by technical specialists.

 The bearings of the wheels (with the exception of polyurethane) as well as the

joints in the load roller section should be regularly cleaned and greased.

8.3 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.

9 Error messages

The battery symbol flashes: The battery is almost empty
and must be replaced.

Low bat

Critical error message:

The battery is almost empty.
Replace it immediately.
Otherwise the weighing system will turn off. All data will

be deleted and you will have to readjust the system.

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10 Instant hel p

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.

Help:

Fault Possible cause

The displayed weight does not glow.

• The balance is not switched on.

• The batteries are empty

The displayed weight is permanently

changing

• Draught/air movement

• Sites with vibration.

• The weighing plate is in contact with

foreign matter.

• Electromagnetic fields / static char g i ng
(choose different location/switch off
interfering device if possible)

The weighing value is obviously

• The display of the balance is not at zero

wrong

• Adjustment is no longer correct.

• Great fluctuations in temperature.

• Electromagnetic fields / static char g i ng

(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 in for m man u fac tur er .