KERN & SOHN CH 50K100 User Manual

KERN & Sohn GmbH

Ziegelei 1

E-Mail: [e-mail]

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

Internet: www.kern-sohn.com

Operating manual
Electronic Suspending Balance

Logbook
Regular maintenance and care

KERN CH

Version 3.2
08/2014
GB

D-72336 Balingen

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

CH-BA-e-1432

KERN CH

Electronic Suspending Balance

GB

Version 3.2 08/2014

Operating instructions / Logbook

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. Commis s ioning ____________________________________________________________ 12

4.1 Unpacking _________________________________________________________________ 12

4.2 Scope of delivery ____________________________________________________________ 12

4.3 Checking the original dimensions _______________________________________________ 13

4.4 Battery operatio n ____________________________________________________________ 13

5. Operation _________________________________________________________________ 14

5.1 Safety instruct ions ___________________________________________________________ 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 nclos ure _________________________________________________________________ 29

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

10. Declaration of conformity ____________________________________________________ 30

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

temperature
Ambient humidity (max ) 80 %

Battery
(in series)

Display Digit height 11 mm

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

5…+ 35 °C

1 x 9 V Block

Operating time 20 h

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

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1.1 Dimensions

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2. General Safety Instructions

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

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. Chang e lo cati on or
remove source of interference.

CH-BA-e-1432 5

2.4 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.

 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 al l owed.

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 (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.

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 outdoor s .

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3. The suspended balance at a glance

3.1 Overview

1 Display
2 Keyboard
3 Hooks
4 Tape measure

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1 Battery compartment
2 Tape measure

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