Kern WTB 1K -4N, WTB 3K -3N, WTB 6K -3N, WTB 10K -3N, WTB 30K -3N User guide

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 instructions
Compact balance

KERN WTB-N

Version 2.0

09/2012
GB

WTB-N-BA-e-1220

GB

KERN WTB-N

Version 2.0 09/2012

Operating instructions
Compact balance

Contents

1 Technical data ............................................................................................ 3

1.1 Dimensions............................................................................................................................. 5

2 Appliance overview .................................................................................... 6

2.1 Overview of display ................................................................................................................ 6

2.2 Keyboard overview ................................................................................................................. 8

3 Basic Information (General) ...................................................................... 9

3.1 Proper use .............................................................................................................................. 9

3.2 Improper Use ......................................................................................................................... 9

3.3 Warranty ................................................................................................................................. 9

3.4 Monitoring of Test Resources ................................................................................................ 9

4 Basic Safety Precautions ........................................................................ 10

4.1 Pay attention to the instructions in the Operation Manual ................................................... 10

4.2 Personnel training ................................................................................................................ 10

5 Transport and storage ............................................................................. 10

5.1 Testing upon acceptance ..................................................................................................... 10

5.2 Packaging / return transport ................................................................................................. 10

6 Unpacking, Setup and Commissioning .................................................. 11

6.1 Installation Site, Location of Use .......................................................................................... 11

6.2 Unpacking and placing ......................................................................................................... 12

6.2.1 Scope of delivery .................................................................................................................. 14

6.3 Rechargeable battery operation (optional) ........................................................................... 14

6.3.1 Mains connection during rechargeable battery operation .................................................... 16

6.4 Initial Commissioning ........................................................................................................... 17

6.5 Type of protection IP65 ........................................................................................................ 17

7 Adjustment ............................................................................................... 17

7.1 Adjustment ........................................................................................................................... 17

7.1.1 Adjustment ........................................................................................................................... 18

8 Operation .................................................................................................. 19

8.1 Weighing .............................................................................................................................. 19

8.2 Taring ................................................................................................................................... 19

8.3 Background illumination ....................................................................................................... 20

8.4 Weighing with tolerance range ............................................................................................. 21

9 The menu .................................................................................................. 23

9.1 Navigation in the menu ........................................................................................................ 23

9.2 Menu overview ..................................................................................................................... 24

9.3 Set auto-OFF function .......................................................................................................... 25

9.4 Multi-Tare function ............................................................................................................... 26

10 Error messages ........................................................................................ 26

11 Instant help ............................................................................................... 27

12 Service, maintenance, disposal .............................................................. 28

12.1 Cleaning ............................................................................................................................... 28

12.2 Service, maintenance ........................................................................................................... 28

12.3 Disposal................................................................................................................................ 28

WTB-N-BA-e-1220 2

1 Technical data

KERN

WTB

1K -4N

WTB

3K -3N

WTB

6K -3N

Weighing range (max)

1.5 kg

3 kg

6 kg

Readability (d)

0.2 g

0.5 g

1 g

Reproducibility

0.2 g

0.5 g

1 g

Linearity

±0.4 g

±1 g

±2 g

Recommended adjustment
weight, not added (class)

1500 g

(M1)

3 kg

(M1)

6 kg

(M1)

Stabilization time (typical)

2 sec.

Units

kg

Warm-up time

30 min.

Electric Supply

Input voltage: 110V-230V AC

Power supply unit: 12 V, 500 mA

Rechargeable battery
operation

Service life: background illumination ON: 30 h

Background illumination off: 50 hours

Loading time 12 h

Auto-Off (rechargeable
battery)

15 min., 5 min., 3 min., off

Display type

LCD with background illumination

Character height 2.5 cm

Operating temperature

-10° C …. + 40° C

Humidity of air

0 % - 80 % (non-condensing)

Dimensions of weighing plate
(Stainless steel) (mm)

262 x 202

Casing dimensions

286 x 316 x 126.5

Weight kg (net)

3.2

IP protection

IP65

3 WTB-N-BA-e-1220

KERN

WTB

10K -3N

WTB

30K -3N

Weighing range (max)

15 kg

30 kg

Readability (d)

2 g

5 g

Reproducibility

2 g

5 g

Linearity

±4 g

±10 g

Recommended adjustment
weight, not added (class)

15 kg

(M1)

30 kg

(M1)

Stabilization time (typical)

2 sec.

Units

kg

Warm-up time

30 min.

Electric Supply

Input voltage: 110V-230V AC

Power supply unit: 12 V, 500 mA

Rechargeable battery
operation

Service life: background illumination ON: 30 h

Background illumination off: 50 hours

Loading time: 12 h

Auto-Off (rechargeable
battery)

15 min., 5 min., 3 min., off

Display type

LCD, digit height 25 mm

Operating temperature

-10° C …. + 40° C

Humidity of air

0 % - 80 % (non-condensing)

Dimensions of weighing plate
(Stainless steel) (mm)

262 x 202

Casing dimensions

286 x 316 x 126.5

Weight kg (net)

3.2

IP protection

IP65

WTB-N-BA-e-1220 4

1.1 Dimensions

5 WTB-N-BA-e-1220

2 Appliance overview

1 Weighing plate
2 Keyboard
3 Bubble level
4 Display

2.1 Overview of display

Rear view:

WTB-N-BA-e-1220 6

Display

Description

Description

Zeroing display

Should the balance not display exactly zero
despite empty scale pan, press the

button. The balance will be set to zero after a

short standby time.

Stability display

Scales are in a steady state

Net weight display

Net weight will be displayed

Capacity display
Rechargeable battery

Triangle above the capacity indicator appears
when the battery capacity is almost exhausted

Display Weighing with
tolerance range

Triangle above "+": upper limit value
Triangle above "-": lower limit value

Power supply connected

Lights with power supply via power supply unit,
then the battery is being charged

Display Weighing unit kg

Displayed weight in kg

7 WTB-N-BA-e-1220

Key

Description

Function

in menu

ON/OFF-switch

Turn on/off

TARE button

 Tare balance
 Weighing with

tolerance range

 Call up menu
 Change to the next menu

item /parameter

Zero setting key

Set balance to zero

 Select menu item /

parameter

+

Push TARE + reset
button
simultaneously

Switch-over units

2.2 Keyboard overview

WTB-N-BA-e-1220 8

3 Basic Information (General)

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 balcance”, i.e. the
material to be weighed is manually and carefully placed in the centre of the weighing
pan.. 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“. (Example: Slowly draining fluids from a
container on the balance.)
Do not leave permanent load on the weighing pan. 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 or damage by media, liquids, natural wear and tear
 The appliance is improperly set up or incorrectly electrically connected
 The measuring system is overloaded

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.

9 WTB-N-BA-e-1220