KERN & Sohn GmbH
Ziegelei 1
D-72336 Balingen
E-Mail: info@kern-sohn.com
Operating Instructions
Hanging Balance
KERN CH
Version 2.7
07/2009
GB
Tel: +49-[0]7433- 9933-0
Fax: +49-[0]7433-9933-149
Internet: www.kern-sohn.com
CH-BA-e-0927
GB Operating Instructions Hanging Balance
nature and scope of this check. Information is available on
1 Technical Data
KERN
Readout
Weighing range
2 Fundamental information (general)
2.1 Intended use The balance you have acquired serves to determine the weigh-
ing value of the 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 attached at the balance. The
weighing value can be read off after a stable weighing value
has been obtained.
2.2 Inappropriate use Do not use the balance for dynamic weighing. 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: Slow draining off of liquid from a container suspended from the balance)
Do not attach a continuous load. This can damage the measuring unit as well as the parts, relevant to safety.
Prevent jolts, torsion and oscillation (e.g. by appending slopingly) of all kinds. Be sure to prevent overloading the balance
in excess of the stated maximum load (max.), minus any tare
weight that may possibly exist. This could damage the balance
(risk of breakage).
Important:
• Always make sure that there are no people or materi-
als below the load that could be injured or damaged!
• The balance is not suitable for weighing people. Do
not use as baby scales!
• The balance does not comply with the medical prod-
uct law (MPG).
Never operate the balance in hazardous locations. The series
design is not explosion-proof. Structural alterations may not be
made to the balance. This can lead to incorrect weighing results, faults concerning safety regulations as well as to destruction of the balance. The balance may only be used in compliance with the described guidelines. Varying areas of application/planned use must be approved by KERN in writing.
2.3
Guarantee
The guarantee is not valid following
• non-observation of our guidelines in the operating
instructions
• use outside the described applications
• alteration to or opening of the device
• mechanical damage and damage caused by media,
liquids
• natural wear and tear
• inappropriate erection or electric installation
• overloading of the measuring equipment
2.4 Monitoring the test substances The metrology features of the balance and any possible avail-
able adjusting weight must be checked at regular intervals
within the scope of quality assurance. For this purpose, the
answerable user must define a suitable interval as well as the
CH15K20 CH50K50 CH50K100 CH50K500
20 g 50g 100g 500g
15 kg 50kg 50kg 50kg
KERN’s home page (www.kern-sohn.com
monitoring of balance test substances and the test weights
required for this. Test weights and balances can be adjusted
quickly and at a reasonable price in KERN’s accredited DKD
calibration laboratory (return to national normal).
3 Fundamental safety information
Do not use the hanging balance to transport loads.
Prevent jolts, torsion and oscillation (e.g. by appending
slopingly) of all kinds.
Never use the hanging balance over the maximum
permitted weight (!!Danger of breaking!!).
Always make sure that there are no living beings or
materials below the load that could be injured or damaged.
The hanging electronic balances from the KERN CH
series are only suitable for hand-held use (see photo).
They are not suitable for hanging from a mechanical
hook, e.g. a crane hook.
3.1 Observe the information in the operating instructions Please read the operating instructions carefully before erecting
and commissioning, even if you already have experience with
KERN balances.
3.2 Staff training The device may only be operated and looked after by trained
members of staff.
) with regard to the
CH-BA-e-0927
7
4 Transport and storage
4.1 Acceptance check Please check the packaging immediately upon delivery and the
device during unpacking for any visible signs of external damage.
4.2 Packaging Please retain all parts of the original packaging in case it
should be necessary to return items at any time.
Only the original packaging should be used for return consignments. Before despatch, disconnect all attached cables and
loose/movable parts. Apply any intended transport security
devices. Secure all parts, e.g. glass windshield, weighing plate,
power unit etc., to prevent slipping and damage.
5 Unpacking, installation and commissioning
5.1 Place of installation, place of use The balance is constructed in such a way that reliable weighing
results can be achieved under normal application conditions.
By selecting the correct application location for your balance,
you will be able to work quickly and precisely.
Therefore please observe the following at the application
location:
• 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. Inadmissible bedewing (condensation of air
moisture on the device) can occur if a cold device is taken
into a significantly warmer environment. In this case,
please acclimatise the device for approx. 2 hours at room
temperature after it has been disconnected from the batterys.
• Avoid static charging of the material to be weighed, weighing container and windshield.
Major display deviations (incorrect weighing results) are possible if electromagnetic fields occur as well as due to static
charging and instable power supply. It is then necessary to
change the location.
5.2 Unpacking
Carefully remove the balance from its packaging, remove the
plastic wrapping and position the balance in its intended working location.
5.2.1 List of items supplied
Standard accessories:
• Hanging balance
• Battery
• Operating instructions
5.4 The menu Ö When the balance is switched off, press the HOLD-key
and keep it pressed
Ö Do not release the HOLD-key. Press also the
ON/OFF/TARE-key and keep it pressed
Ö Keep the ON/OFF/TARE-key pressed, however release
the HOLD-key
Ö Press HOLD-key anew
Ö Keep both keys pressed until in the display “tr” appears
Ö Release both keys. The balance is situated in the menu.
Ö Using the ON/OFF/TARE button you can select between
the following functions:
tr (zero tracking) : ON/OFF
AF (Auto off): ON/OFF
rST (Reset to factory setting): YES/NO
Ö Confirm with HOLD-key
Ö In the display appears the current setting „ON“ or „OFF“
resp. „YES“ or „NO“.With help of the ON/OFF/TARE-key
you can select between „ON“ or „OFF“ resp. „YES“ or
„NO“. Confirm your selection with the HOLD-key. After a
short period the balance returns automatically to weighing
mode.
6 Adjustment
As the acceleration value due to gravity is not the same at
every location on earth, each balance 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 balance has not already been adjusted to the location in the factory). This adjustment process must be carried
out during the initial start-up, after change in location and variation of surrounding temperature. It is also recommendable to
adjust the balance periodically during weighing operation in
order to obtain exact measured values.
6.1 Adjusting Using a precision weight, the accuracy of the balance can be
checked at any time and adjusted.
Adjustment procedure:
Check that the surrounding conditions are stable. A short
warm-up time of about 1 minutes are recommended for stabilisation.
Press “UNIT” key approx. 3 seconds, ”CAL” and then the exact
weight of the adjusting weight will appear at the display.
Hang on the adjusting weight on the hook of the hanging scale.
“ F” will appear a short time later, and then turn off.
In case of an adjusting error or a wrong adjusting weight “ E”
appears in the display.
Recommended Adjusting weight: (not included)
CH15K20 CH50K50 CH50K100 CH50K500
10kg (M3) 20kg (M3) 20kg (M3) 20kg (M3)
5.3 Battery operation and change Push off the battery cover on the back of the balance in the
direction of the arrow. Insert 9 V battery. Replace the battery
cover. When the batteries are exhausted the message "LO"
appears in the balance display. Press the OFF switch and
replace the batteries immediately. To preserve battery life the
balance switches off automatically after 4 minutes if no weighing has taken place. Deactivate this Auto-OFF function in the
menu as follows:#
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CH-BA-e-0927
7 Operation Instruction
7.1 Weighing
• The balance is switched on by pressing the "ON/OFF/TARE"
key.
• The balance display shows "0.00“.
• Hang on the weighing object carefully.
• If the weighing object is heavier than the weighing range the
display indicates "E“ (=Overload). Be sure to prevent overloading (chap. 2.2 “Inappropriate use”).
• The balance is switched off by pressing the "ON/OFF/TARE“
key once.
7.2 Weighing units switch-over
Using the “UNIT” key you can switch over the display between
N, lb and kg. The X marks the active setting.
7.3 Taring
• Switch the balance on with " ON/OFF/TARE " key and wait
for "0“ to appear in the display. Hang on the tare load carefully and press the " ON/OFF/TARE " key again.
• The balance display becomes "0.00“. The weight of the tare
load has however been memorised internally. The item to be
weighed can now be placed carefully in the tare container
and the weight can be read off.
7.4 HOLD-key / animal weighing / peak value weighing
The HOLD-key may be used to activate various functions.
To select and activate these functions, please follow the sequence of operations below:
Switch on the balance and keep pressing the HOLD-key
until "H x" appears on the display.
The currently activated function is shown above “H1-H6”
and by a triangle on the display.
To select one of the functions, please press the
ON/OFF/TARE -key. The setting is stored by briefly pressing the HOLD-key.
7.4.1 Functions
HOLD function:
The HOLD function allows the fixed display of weighing values
for longer periods of time.
Depending on the operating range the ON/OFF switch, criteria
may be selected from 4 options (H1-H4).
• Selecting the setting “H1” freezes the weighing values for
5 seconds after the HOLD-key was operated.
• Selecting “H2” freezes the weighing values from operating
the HOLD-key until another key is pressed.
• Selecting “H3” freezes the weighing values automatically
for 5 seconds.
• Selecting “H4” freezes the weighing values automatically
until a key is pressed.
HOLD function is set in the following way:
• Switch on the balance by pressing ON/OFF/TARE key.
• Press and hold the HOLD key until the display shows the
required setting (check above „H1–H4”)
• Save the setting by brief pressing the HOLD key
Animal weighing function:
This function is suitable for unsteady weighing procedures. A
mean value is derived from 16 weighing values.
The animal weighing function is set in the following way:
• Switch on the balance by pressing the ON/OFF/TARE key.
• Press and hold the HOLD key until „H x” is shown on the
display.
• Press the ON/OFF/TARE key repeatedly until „H5” is
shown on the dispay.
• Save the setiing by briefly pressing the HOLD key.
• Once again press HOLD key.
• On the left site, on top of the display, a triangle will start to
blink.
• Hang on the weighing object.
• During the triangle blinking, the weighing values are
loaded.
• Then an average weight value is shown consisting of the
loaded values.
Peak value function:
This function displays the maximum load value (peak value) of
a weighing process.
Measuring frequency: 200ms
Attention:
Under no circumstances may the peak value exceed the
stated maximum load of the balance (risk of fracture!!).
How to set the peak value.
• Switch on the balance by pressing the ON/OFF/TARE key.
• Press and hold the HOLD key until „H x” is shown on the
display.
• Press the ON/OFF/TARE repeatedly until „H6” setting is
shown on the display.
• Save the setting by briefly pressing the HOLD key.
• Hang on the weighing object.
• The operation of the peak value function is shown by the
triangle on top left side of the display.
The negative value (
ance.
-) is shown right after unloading the bal-
CH-BA-e-0927
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8 Maintenance, upkeep, disposal
8.1 Cleaning Only use a cloth dampened with mild suds and not aggressive
cleaning agents (solvents or similar). Please ensure that fluids
are not able to get into the device and rub off using a clean,
soft cloth. Loose sample residue/powder can be removed
carefully using a brush or hand vacuum cleaner.
8.2 Maintenance, upkeep The operating company shall ensure that load-bearing compo-
nents are checked by a competent person at maximum intervals of one year.
These checks can be necessary at intervals shorter than one
year depending on the conditions of use. This applies, for example, in the case of particularly frequent use, increased wear
and corrosion.
The device may only be opened by trained service engineers
authorised by KERN.
Disconnect from the mains supply before opening.
8.3 Disposal The operating company shall dispose of the packaging and the
device in compliance with the valid national or regional law of
the operating location.
9 Troubleshooting
The balance should be switched off for a short time following
an interruption in the programme sequence. It is then necessary to repeat the weighing process from the beginning.
Interruption Possible cause
Weight display is
not illuminated.
The weight display
changes continually
The weighing
result is obviously
incorrect
• The balance is not switched on.
• The batteries are wrongly inserted, the
batteries are empty
• No batteries are attached
• Draught/air movement
• Table/floor vibrations
• Vibrations on the balance suspension
• Electromagnetic fields / static charging
(choose different location/switch off interfering device if possible)
• The balance display is not set to zero
• Adjustment is no longer correct.
• Great fluctuations in temperature.
• Electromagnetic fields / static charging
(choose different location/switch off interfering device if possible)
Switch the balance off if other error messages should appear
and then switch on again. Contact the manufacturer if the error
message does not disappear.
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CH-BA-e-0927
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