KERN CH, HDB 5K5N, HDB 10K10N, HDB 6K-3XL, HDB 10K-2XL Operating Manual

Operating manual &UDQH6FDOHV

Logbook
Regular maintenance and care

KERN CH

Version 3.2
08/2014
GB

CH-BA-e-1432

PCE Americas Inc.
711 Commerce Way
Suite 8
Jupiter
FL-33458
USA
From outside US: +1
Tel: [phone]
Fax: [phone]
[e-mail]

www.pce-instruments.com/english

www.pce-instruments.com

PCE Instruments UK Ltd.

Units 12/13

Southpoint Business Park

Ensign way

Hampshire / Southampton

United Kingdom, SO31 4RF

From outside UK: +44

Tel: [phone]

Fax: [phone]

[e-mail]

by

GB

KERN CH

Version 3.2 08/2014

Operating instructions / Logbook

Electronic Suspending Balance

Contents

1. Technical data ______________________________________________________________ 3

1.1 Dimensions _________________________________________________________________ 4

2. General S afety Instructions ___________________________________________________ 5

2.1 Duties of the owner-operator ____________________________________________________ 5

2.2 Organizational measures _______________________________________________________ 5

2.3 Environmental conditions _______________________________________________________ 5

2.4 Pay attention to the instructions in the Operation Manual ______________________________ 6

2.5 Proper use __________________________________________________________________ 6

2.6 Improper Use ________________________________________________________________ 6

2.7 Warranty ____________________________________________________________________ 6

2.8 Safe working ________________________________________________________________ 7

2.9 Monitoring of Test Resources ___________________________________________________ 7

2.10 Testing upon acceptance _______________________________________________________ 7

2.11 Initial Commissioning __________________________________________________________ 7

2.12 Shutdown and storage _________________________________________________________ 7

3. The sus pended balance at a glance _____________________________________________ 8

3.1 Overview ___________________________________________________________________ 8

3.2 Overview visual displays and keyboard ___________________________________________ 10

3.3 Label______________________________________________________________________ 11

4. Commiss ioning ____________________________________________________________ 12

4.1 Unpacking _________________________________________________________________ 12

4.2 Scope of delivery ____________________________________________________________ 12

4.3 Checking the original dimensions _______________________________________________ 13

4.4 Battery operation ____________________________________________________________ 13

5. Operation _________________________________________________________________ 14

5.1 Safety instructions ___________________________________________________________ 14

5.2 Loading the suspended balance ________________________________________________ 16

5.3 Turn on/off _________________________________________________________________ 18

5.4 Taring _____________________________________________________________________ 18

5.5 Weighing __________________________________________________________________ 18

5.6 Switch-over weighing unit _____________________________________________________ 19

5.7 Functions __________________________________________________________________ 19

6. Menu _____________________________________________________________________ 21

7. Adjus tment ________________________________________________________________ 22

8. Cleaning, Maintenance and Dis pos al ___________________________________________ 23

8.1 Cleaning and Disposal ________________________________________________________ 23

8.2 Regular maintenance and care _________________________________________________ 24

8.3 Checklist „Regular maintenance“ ________________________________________________ 26

9. E nc los ure _________________________________________________________________ 29

9.1 Checklist „Enhanced maintenance“ (General revision) _______________________________ 29

10. Declaration of conformity ____________________________________________________ 30

2 CH-BA-e-1432

1. Technical data

KERN CH 15K20 CH 50K50 CH 50K100

Readability (d) 20 g 50 g 100 g
Weighing range (max) 15 kg 50 kg 50 kg
Taring range (subtractive) 15 kg 50 kg 50 kg
Reproducibility 20 g 50 g 100 g
Linearity ± 40 g ± 100 g ± 200 g
Recommended adjustment

weight, not added (class)

10 kg (M3) 20 kg (M3) 20 kg (M3)

Stabilization time 2 s
Warm-up time 10 min
Units kg, lb, N
Auto off 3 min
Allowable ambient

temperature

5…+ 35 °C

Ambient humidity (max) 80 %

Battery
(in series)

1 x 9 V Block

Operating time 20 h

Display Digit height 11 mm
Housing size W x D x H 90 mm x 30 mm x 176.5 mm
Housing material Synthetic material
Material Hook Stainlees steel
Net weight 250 g

CH-BA-e-1432 3

1.1 Dimensions

4 CH-BA-e-1432

2. General Safety Instructions

2.1 Duties of the owner-operator
Follow national accident prevention regulations and all operator health and

safety at work and operating regulations.

 The balance may only be used for the proposed purpose. Any type of use which

is not specified in these operating instructions, will be considered as improper
use. The customer is solely responsible for material damage and injury of persons
resulting from an improper use, Messrs. KERN & Sohn will not be liable under
any circumstance.
Messrs . KERN & Sohn cannot be held liable, if the suspended balance is
modified or used improperly and if damage is resulting from such use.

 Inspect and service suspended balance and load suspension device regularly

(see chap. 8.3).

 Log the test result and keep it in the logbook.

2.2 Organizational measures

 Only trained and instructed staff may operate the balance.
 Make sure that the operating instructions are kept nearby the operation site of the

suspended balance.

 Assembly, commissioning and maintenance should only be carried out by trained

specialists.

 Weight-bearing components must not be replaced

2.3 Environmental conditions

 Never operate suspended balance in spaces exposed to explosion hazards. The

serial version is not explosion protected.

 Operate the suspended balance only under environmental conditions as specified

in these operating instructions (especially in chapter 1 „Technical data“).

 Do not expose the suspended balance to strong humidity. 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.

 Do not use suspended balance in environments exposed to corrosion hazards.
 Protect the suspended balance against high humidity, vapours and dust.
 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 locati on or
remove source of interference.

CH-BA-e-1432 5

2.4 Pay attention to the instructions in the O pera tion 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.

2.5 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 suspended on the load receptor only vertically, manually,
carefully and without jerks. As soon as a stable weighing value is reached the
weighing value can be read.

 Use the suspended balance only for lifting and weighing of freely movable loads.
 Danger of injury due to improper use. Not allowed are e.g.:

- Exceeding the allowed nominal load of crane, suspended balance or any

type of load attachment devices

- Conveying persons,

- Pulling loads over an inclined surface,

- Tearing-off, pulling or towing loads.

 Modifications or reconstructions of the suspended balance are not allowed.

2.6 Improper Use

Do not use 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“. (Example: Slowly draining fluids from a
container suspended on the balance.) Do not leave permanent load suspended on
the balance. This may damage the measuring system as well as safety-relevant
parts.

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

2.7 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

6 CH-BA-e-1432

2.8 Safe working

 Do not stand under swinging loads, see chap. 5.1.

2.9 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 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.

2.10 Testing upon acceptance

Inspect packaging immediately upon receipt and inspect device when unpacking, see
chap. 4.1. in the event of any evident damage.

2.11 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. 1).
During this warming up time the balance must be connected to the power supply
(mains, accumulator or battery).
The accuracy of the balance depends on the local acceleration of gravity.
Strictly observe hints in chapter Adjustment.
For checking original dimensions, s. chap. 4.3

2.12 Shutdown and storage

 Switch off suspended balance and remove batteries
 Do not store suspended balance outdoors .

CH-BA-e-1432 7

3. The suspended balance at a glance

3.1 Overview

1 Display
2 Keyboard
3 Hooks
4 Tape measure

8 CH-BA-e-1432

1 Battery compartment
2 Tape measure

CH-BA-e-1432 9

3.2 Overview visual displays and keyboard

Displays:

kg The current measuring unit is kilogram

lb The current measuring unit is pound

N The current measuring unit is Newton

 Indicates the weight value depending on the active setting H1-H6

(see chap. 5.7).
H1-H4: Data-Hold function
H5 Animal weighing function
H6 Peak value function

LO Capacity of batteries exhausted

E Overload

Keyboard:

Key

Description

Description of function

ON/OFF
button

• Switch on balance

• Switch off balance (hold button)

• Taring

• Scroll forward in menu

UNIT-button Switch over weighing unit (kglbN)

HOLD button

• Set weight display

• Display average value for animal weighing

• Confirm menu setting

10 CH-BA-e-1432

3.3 Label

 Do not stand or go under suspended loads.
 Do not use on building site.
 Keep an eye on suspended loads.

(example)

 Do not exceed nominal rated load of balance.

 The product conforms to the requirements of the

German Equipment and Product Safety Act.

CH-BA-e-1432 11

4. Commissioning

+ Always observe chapter 2 „General Safety Instructions“!

4.1 Unpacking

SAFETY

INSTRUCTIONS

for protection against

break

Once delivered and unpacked, suspended balance will
not be taken back.

The suspended balance is sealed by KERN.

 Removal from packaging is also sealed.

+ Broken seal obliges to purchase.

Fig.: Seal

Thanks for your comprehension.
Your KERN Quality assurance team

4.2 Scope of delivery

Remove balance and accessories from packaging, remove packaging material.
Verify that there has been no damage and that all packing items are present.

• Suspended balance, see chap. 3.0

• Hook (stainless steel)

• Batteries (1 x 9 V block)

• Operating instructions / logbook

12 CH-BA-e-1432

4.3 Checking the original dimensions

 Enter the original dimensions shown on the production data sheet in the grey

boxes of checklist chap. 8.3.

 Check original dimension of suspended balance; for implementation see chap. 8.3

„Regular Maintenance“

 Enter all data (date, tester, results) in the first line under „Inspection before first

use“ in the checklist (see chapter 8.3)

CAUTION

If the dimensions of your first safety inspection do not match those
of KERN, the balance must not be put into operation. In thi s cas e
please contact a service partner authorised by Messrs. KERN.

4.4 Battery operation

1 x 9 V block battery

Push out battery cover on the rear side of the balance in arrow direction. Insert V
block battery. Reinsert the battery cover. If the batteries are empty, in the balance
display appears “LO”. Press ON/OFF/TARE -key and replace the batteries
immediately. In order to save the battery, the balance switches automatically off after
4 minutes without weighing. This auto-off function can be deactivated in the menu
(see chap. 6).

CH-BA-e-1432 13

5. Operation

Keep balance only by hand, see fig.
(do not use a crane or alike).

5.1 Safety instructions

DANGER

Risk of injury due to falling loads!

14 CH-BA-e-1432

 Take great care when operating the crane and follow the

general rules for crane operation.



Check all parts (hook, carbines, rings, rope slings,

cables, chains etc.) for excessive wear or damage

 Work only with appropriate speed
 Always avoid vibrations and horizontal forces. Avoid

any kind of shock, torsion and oscillating (e.g. caused

by inclined suspending)

 Do not use the suspended balance for conveying loads.

 Do not stand or go under suspended loads.

 Do not use on building site.

 Keep an eye on suspended loads.

(example)

 Do not exceed nominal rated load of suspended balance

or any kind of attachment device on the suspended

balance.

CH-BA-e-1432 15

5.2 Loading the suspended balance

For good weighing results observe the following, illustrations see next page:
 Do not suspend the balance on load attachment devices. Use only when keeping

by hand.

 Do not pull or push the load or the loaded balance.
 Do not pull the hook horizontally.

Loading the balance

1. Position the hook of the suspended balance over the load.

2. Suspend and lift the load. (directly on the hook)

16 CH-BA-e-1432

Keep balance only by hand!

Do not push or pull

Do not pull the hook
horizontally

CH-BA-e-1432 17

5.3 Turn on/off

Start-up

 Press the ON/OFF/TARE-key. The display lights up and the balance carries out a

selftest. The selftest is completed when the weight value 0.0 appears on the
display.

Switching Off
 Press the ON/OFF/TARE-key for a long time.

5.4 Taring

 Suspend preload.

Press the ON/OFF/TARE-button, the zero display appears. The weight of the
container is now internally saved.

 Weigh the material, the net weight will be indicated.
 After removing the preload weight appears as negative display.
 To delete the tare value, remove load from the suspended balance and press the

TARE button.

5.5 Weighing

 Load the suspended balance.

The weight value will be displayed at once.

Overload warning

Overloading exceeding the stated maximum load (max) of the balance, minus
a possibly existing tare load, must be strictly avoided. This could cause
damage to the balance.
Exceeding the maximum load is indicated by the display „E“. Unload balanc e
or reduce preload.

18 CH-BA-e-1432

5.6 Switch-over weighing unit

The next measuring unit will be displayed kg lbN after each press of the UNIT
button.
The  indicator shows the active unit.

5.7 Functions
With help of the Hold-key the following functions can be activated:

Adjustment Function

H1 Data-Hold function 1

Weighing value frozen for 5 sec. after pressing
the Hold-key

+ see chap.

5.7.1

H2 Data-Hold function 2

The weighing value will be froz en a fter pr ess ing
the Hold-key until another key is actuated

H3 Data-Hold function 3

The weighing value is automatically frozen for 5
sec.

H4 Data-Hold function 4

The weighing value is automatically frozen after
reaching a stable value until a key will be
actuated

H5 Animal weighing function

+

see chap.

5.7.2

H6 Peak value function

+

see chap.

5.7.3

CH-BA-e-1432 19

5.7.1 Data-Hold function

 Switch on the balance, keep the HOLD-button pressed until the current setting

„Hx“ (H1 – H6) appears.

 Press ON/OFF/TARE-button repeatedly until the desired setting „H1-H4“ is

displayed.

 Confirm setting with the HOLD button.
 Suspend the material to be weighed
 The weight value is fixed and displayed depending on the setting (H1 – H4) (see

chap. 5.7), represented by the [] in the upper left.

5.7.2 Animal weighing function

This function is suitable for busy weighing procedures. The result is a mean value
formed by 16 weighing values.

 Switch on balance using the ON/OFF/TARE–button
 Press the HOLD-button and keep it pressed until „H x“ in the display appears
 Press the ON/OFF/TARE-button until „H5“ in the display appears.
 Save the setting by shortly pressing the HOLD-button
 Press the HOLD-button anew
 Upside left in the display a [] starts flashing.
 Suspend a load
 As long as the [] flashes, the weighing values are recorded.
 After that the average weighing value of the recorded weighing values is

recorded.

20 CH-BA-e-1432

5.7.3 Peak value function

This function displays the highest load value (peak value) of a weighing.
Measuring frequency: 200ms

Attention:

Never exceed the maximum permitted load of the peak value on the
balance (!!Danger of breaking!!).

• Switch on balance using the ON/OFF/TARE–button

• Press the HOLD-button and keep it pressed until „H x“ in the display appears

• Press the ON/OFF/TARE until „H6“ in the display appears

• Save the setting by shortly pressing the HOLD-button

• Suspend a load

• The peak value function is displayed by a [] upside left

A negative value [-] is displayed as soon as the balance is relieved

6. Menu

 When the balance is switched off, press the HOLD-key and keep it pressed
 Do not release the HOLD-key. Press also the ON/OFF/TARE-key and keep it

pressed

 Keep the ON/OFF/TARE-key pressed, however release the HOLD-key
 Press HOLD-key anew
 Keep both keys pressed until in the display “tr” appears
 Release both keys. The balance is situated in the menu.
 Using the ON/OFF/TARE button you can select between the following functions:

 tr (Zero tracking): ON/OFF
 AF (Auto of f): ON/OFF

 rST (reset to factory settings): YES/NO
 Press the HOLD button to confirm the selected function
 In the display appears the current setting „ON“ or „OFF“ resp. „YES“ or „NO“. You

can select between „ON“ or „OFF“ and/or „YES“ or „NO“ with the
ON/OFF/TARE-button. Confirm your selection with the HOLD-key. After a short

period the balance returns automatically to weighing mode.

CH-BA-e-1432 21

7. Adjustment

As the acceleration value due to gravity is not the same at every location on earth,
each balance must be coordina ted - 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 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 balance
periodically in weighing operation.

Observe stable environmental conditions. A warming up time of approx. 1 minute is
recommended for stabil i z at ion.
Prepare adjustment weight, for details see chap. 1 „Technical data“.

 Switch on balance

 Press Unit button and hold down (approx. 3 sec) until „CAL“ is displayed.

 Wait until the weight value of the required adjustment weight (e.g. 10 kg, see

chap. 1) is displayed.

 Attach adjustment weight, a short time later „F“ will appear.



 After adjustment the balance automatically returns to weighing mode.

An adjusting error or incorrect adjusting weight will be indicated by the error
message; repeat adjustment procedure

22 CH-BA-e-1432

8. Cleaning, Maintenance and Disposal

Danger

Risk of injury and risk of material damage!

The suspended balance is part of the lifting gear!
For a safe operation please observe the following:

 Have carried out a regular maintenance by trained specialized

staff

 Carry out regular maintenance and servicing, see chap. 8.3.
 Have the parts exchanged only by trained specialized staff.
 If there arose discrepancies with the safety checklist, the balance

must not more be put into operation.

 Do not repair the suspended balance yourself. Repair may only be

carried out by service partners authorized by Messrs. KERN.

8.1 Cleaning and Disposal

CAUTION

Damage to suspended balance!

 Do not use industrial solutions or chemicals

(e.g. acid  embrittlement).

 Clean the keyboard and the display with a soft cloth soaked in mild window

cleaning agent.

 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.

CH-BA-e-1432 23

8.2 Regular maintenance and care

 The regular 3-month m aintenance may only be carried out by an expert with

competent knowledge of working with suspended balances. Thereby the national
regulations for prevention of accidents as well as the working, operation and
safety regulations of the owner-operator.

 To check the dimensions only use suitable test devices.
 The regular 12-month maintenance must only be carried out by trained

specialized staff (KERN customer service).

 The results of the maintenance must be written down in the checklist (chap. 8.3).
 The additional results of the extended maintenance have to be entered in the

checklist (chapter 9.1).

 The load suspension device is to be cleaned before inspection, see chap. 8.1.

24 CH-BA-e-1432

Regular maintenance:

Prior to each usage

 Check for fault-free oper ati on o f the att ac h me nt devices

Initial start-up,
every 3 months or
definitely after

12 500 weighing
processes

 Check all dimensions, see checklist chap. 8.3


Check the attachment device (handle grip) for wear and tear,

such as e.g. plastic deformation, mechanical damage
(unevenness), notches, striation, cracks, corrosion, thread
damage and torsions.

 Remove balance from use immediately if a reading exceeds

the permitted deviation from the original reading (see
checklist, chap. 8.3) or any other fault is identified.

 All repairs and replacement parts (e.g. hook) must be

documented by the service partner (see list, chap. 9.1).

Every 12 months or
in any case after 50
000 weighings

 If the enhanced maintenance has to be carried out by

trained staff (KERN customer service). At this general
revision all load carrying parts must be checked for gaps
with magnetic powder

 Plastic parts such as handle must be visually inspected

Every 10 years or
anyway after 500 000

weighings

 Replace the crane balance ent ir el y

Note

During the revision watch out for wear and tear according to the following drawings
(chap. 8.3).

Rejection criteria: Load suspension devices may no longer be used when e.g.

+ Deviations are identified during the inspections specified for servicing.
+ The type or load rating plate is missing.
+ Load suspension devices known to have been overloaded or subject to

other harmful influences may no longer be used and/or may be re-used only
after inspection.

CH-BA-e-1432 25

8.3 Checklist „Regular maintenance“
Original dimensions suspended balance*, serial no.: ………………………………… Capacity ………………………………
Total scale Hooks

d (mm) e (mm) f (mm) g (mm) h (mm) i (mm) Wear and tear

Angle α (°)

Date ………………………………… Tester ………………………………………
*These data can be found in the document attached to the balance. Please keep this document always available.

Total

scale

Hooks

Optical test

d e f g

h i

α

Wear (see
cross­hatched
areas)

No deformation, wear or cracks

Date Tester

handle hook

chain
link

other
parts

Max. admitted variation

1% 1% 5 % 5 %

5 %

5 %

10 °

Revision prior to first
use

3 months/12 500 x

6 months/25 000 x

9 months/37 500 x

12 months/50 000 x

15 months/62 500 x

18 months/75 000 x

21 months/87 500 x

CH-BA-e-1432 26

Total scale Hooks Optical test

d

Safety
fastening

e f g

h i

α

Wear
(see
cross­hatched
areas)

No deformation, wear or cracks

Date Tester

handle hook

chain
link

other
parts

Max. admitted variation

1%

Perfect
working
order

1% 5 % 5 % 5 % 5 %

10 °

Revision prior to first
use

24 months/100 000 x

27 months/112,500 x
30 months/125 000 x
33 months/137 500 x

36 months/150 000 x

39 months/162 500 x
21 months/87 500 x
42 months/175 000 x
45 months/187 500 x

48 months/200 000

51 months/212 500 x
54 months/225 000 x
57 months/237 500 x

60 months/250 000x



All load carrying parts have to be exchanged by a service partner authorised by KERN.

bold letters = this maintenance work has to be carried out by a service partner authorized by KERN.

CH-BA-e-1432 27

1 Chain link

CH-BA-e-1432 28

9. Enclosure

9.1 Checklist „Enhanced maintenance“ (General revision)

The enhanced maintenance has to be carried out by a service partner authorized by KERN.

Suspending balance Model ………………………………….. Serial no. ……………………………………………..

Interval

Magnetic powder
test for cracks

Hooks

Chain links

(marked areas)

Hand grip Date Name Signature

12 months/50 000 x

24 months/100 000 x

36 months/150 000 x

48 months/200 000 x

60 months/250 000 x

72 months/300 000 x

84 months/350 000 x

96 months/400 000 x

108 months/450 000 x

120 months/500 000x



Replace suspended balance completely

CH-BA-e-1432 29