KERN CH15K20 User manual

CH-BA-defsi-0422 5
GB Operating Instructions Hanging Balance
1 Technical Data
KERN CH15K20 CH50K50 CH50K100
Readout 20 g 50g 100g
Weighing range
15 kg 50kg 50kg
2 Fundamental information (general)
2.1 Intended use
The balance you have acquired serves to determine the
weighing 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 meas-
uring unit as well as the parts, relevant to safety.
Prevent jolts, torsion and oscillation (e.g. by appending slop-
ingly) 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 re-
sults, faults concerning safety regulations as well as to de-
struction 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
nature and scope of this check. 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. 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 dam-
aged.
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.

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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 con-
signments. Before despatch, disconnect all attached cables
and loose/movable parts. Apply any intended transport secu-
rity 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 weigh-
ing results can be achieved under normal application condi-
tions.
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 bat-
terys.
•Avoid static charging of the material to be weighed, weigh-
ing container and windshield.
Major display deviations (incorrect weighing results) are possi-
ble 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 work-
ing location.
5.2.1 List of items supplied
Standard accessories:
•Hanging balance
•Battery
•Operating instructions
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 weigh-
ing has taken place.
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 loca-
tion ( 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 recom-
mendable 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 stabi-
lisation.
Press “OFF” 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.
KERN CH15K20 CH50K50 CH50K100
Adjusting weight
(not included)) 10kg (M3) 20kg (M3) 20kg (M3)
7 Operation Instruction
7.1 Weighing
•The balance is switched on by pressing the "ON/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 over-
loading (chap. 2.2 “Inappropriate use”).
•The balance is switched off by pressing the "OFF“ key once.
7.2 Taring
•Switch the balance on with "ON" key and wait for "0“ to ap-
pear in the display. Hang on the tare load carefully and press
the "ON/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.
•If the “ON/TARE” key is pressed, the total tare value will
appear. When the “ON/TARE” key is pressed again, "0.00"
appears on the display. The total tare will be memorised.
7.3 Data HOLD
•When the “HOLD” key is pressed, the display value (even
when the weight values vary) shown on the display will be
held 5 seconds.

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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 com-
ponents 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 neces-
sary to repeat the weighing process from the beginning.
Interruption Possible cause
•The balance is not switched on.
Weight display is
not illuminated. •The batteries are wrongly inserted, the
batteries are empty
•No batteries are attached
•Draught/air movement
•Table/floor vibrations
The weight dis-
play changes
continually
•Vibrations on the balance suspension
•Electromagnetic fields / static charging
(choose different location/switch off inter-
fering device if possible)
•The balance display is not set to zero
•Adjustment is no longer correct.
The weighing
result is obviously
incorrect
•Great fluctuations in temperature.
•Electromagnetic fields / static charging
(choose different location/switch off inter-
fering 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.