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FEBRUARY 2021
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PRECAUTIONS

Prior to installation, use or maintenance activities, carefully read this user 

manual and follow the provided guidelines.

Prior to the first use, carefully read this user manual. Use the weighing 

device only as intended.

Place weighed loads in the centre of the weighing pan.

Load the weighing pan with loads of gross weight which does not exceed 

the maximum capacity.

Mind not to leave heavy loads on the weighing pan for longer periods 

of time.

Protect the indicator against considerable temperature variation, solar and 

UV radiation, substances causing chemical reactions.

The WTC scale must not be operated in hazardous areas endangered with 

explosion of gases, and in dusty environments.

In case of damage, immediately unplug the device from the mains.

Scales to be decommissioned must be decommissioned in accordance 

with valid legal regulations.

Do not let battery discharge in case of prolonged storage of the device 

in low temperature.

A worn out battery can be replaced only by the manufacturer or by the 

authorized service.

Accumulators do not belong to regular household waste. The European 

legislation requires discharged accumulators to be collected and disposed 

separately from other communal waste with the aim of being recycled. 

Symbols on batteries identify harmful compounds: Pb = lead, 

Cd = cadmium, Hg = mercury. Dear user, you are obliged to dispose of the 

worn out batteries as regulated.
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CONTENTS

1. GENERAL INFORMATION ................................................................................................................................ 5

2. WARRANTY CONDITIONS ............................................................................................................................... 5

3. MAINTENANCE ACTIVITIES ............................................................................................................................ 6

3.1. Cleaning ABS Components......................................................................................................................... 6

3.2. Cleaning Stainless Steel Components........................................................................................................ 7

3.3. Cleaning Powder-Coated Components....................................................................................................... 7

3.4. Cleaning Aluminium Components............................................................................................................... 7

4. SERVICE AND REPAIR..................................................................................................................................... 7

5. RECYCLING....................................................................................................................................................... 8

6. MECHANICAL DESIGN ..................................................................................................................................... 8

6.1. Dimensions.................................................................................................................................................. 8

6.2. Connectors Arrangement ............................................................................................................................ 9

6.3. RS232 Connector........................................................................................................................................ 9

6.4. Operation panel ......................................................................................................................................... 10

7. INSTALLATION................................................................................................................................................ 10

7.1. Unpacking and Installation ........................................................................................................................ 10

7.2. Levelling..................................................................................................................................................... 11

7.3. Connecting the Scale to the Mains ........................................................................................................... 11

7.4. Warm-Up Time .......................................................................................................................................... 12

7.5. Battery Charge Status ............................................................................................................................... 12

7.6. Battery Charge Status Check.................................................................................................................... 12

8. OPERATING THE MENU................................................................................................................................. 13

8.1. Return to the Weighing Mode.................................................................................................................... 13

9. WEIGHING........................................................................................................................................................ 13

10. DIAGRAMS OF CONNECTION CABLES..................................................................................................... 14

11. TECHNICAL SPECIFICATIONS.................................................................................................................... 15

12. TROUBLESHOOTING ................................................................................................................................... 15

13. ERROR MESSAGES ..................................................................................................................................... 16
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1. INTENDED USE

WTC precision scale enables fast and accurate mass measurements under 

laboratory conditions. The weighing pan, made of stainless steel and equipped 

with an anti-draft shield, is an integral part of the WTC scale. Due to a backlit 

LCD display the measurement result is clearly visible. The scale is equipped 

with an internal battery which allows its operation in places where there 

is no access to the mains.

WTC scale is equipped with the following interfaces: RS 232, USB type A, USB 

type B, wireless communication (option). The interfaces enable cooperation 

between the scale and peripheral devices (e.g. printer, computer, flash drive).

This equipment has been tested and found to comply with 

the limits for a Class A digital device, pursuant to part 15 

of the FCC Rules. These limits are designed to provide 

reasonable protection against harmful interference when the 

equipment is operated in a commercial environment. 

This equipment generates, uses and can radiate radio 

frequency energy and, if not installed and used in 

accordance with the instruction manual, may cause harmful 

interference to radio communications. Operation of this 

equipment in a residential area is likely to cause harmful 

interference in which case the user will be required 

to correct the interference at his own expense.

This equipment has been tested and found to comply with 

the limits for a Class A according to standards, listed in 

declaration of conformity, required by European regulations 

in order to use CE marking. This equipment is not intended 

for use in residential environments and may not provide 

adequate protection to radio reception in such 

environments. Class A products may also be utilized in 

residential/domestic environments but may cause 

interference and require the user to take adequate corrective 

measures.

2. WARRANTY CONDITIONS

A. RADWAG feels obliged to repair or exchange all elements that appear 

to be faulty by production or by construction. 

B. Defining defects of unclear origin and means of their elimination can only 

be realized with assistance of manufacturer and user representatives.
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C. RADWAG does not bear any responsibility for damage or losses 

resulting from unauthorized or inadequate performing of production 

or service processes.

D. The warranty does not cover:

 mechanical damage caused by product exploitation other than 

intended, damage of thermal and chemical origin, damage caused by 

lightning, overvoltage in the power network or other random event,

 inappropriate cleaning habits.

E. Loss of warranty takes place if:

 a repair is carried out outside RADWAG authorized service point,

 service claims intrusion into mechanical or electronic construction 

by unauthorized people,

 the device does not bear company security stickers.

F. Warranty conditions outline the warranty period for rechargeable 

batteries attached to the device for 12 months.

G. For detailed warranty conditions read the warranty certificate.

H. Contact with the central authorized service: +48 (48) 386 63 30.

3. MAINTENANCE ACTIVITIES

In order to ensure safety in the course of cleaning, it is necessary to disconnect 

the device from the mains. With this condition met, uninstall the weighing pan 

and other detachable components.

Cleaning the weighing pan while still installed may cause 

damage of the measuring system.

3.1. Cleaning ABS Components

To clean dry surfaces and avoid smudging, use clean non-colouring cloths 

made of cellulose or cotton. You can use a solution of water and detergent 

(soap, dishwashing detergent, glass cleaner). Gently rub the cleaned surface 

and let it dry. Repeat cleaning process if needed.

In the case of hard to remove contamination, e.g. residues of adhesive, rubber, 

resin, polyurethane foam etc., you can use a special cleaning agents based on 

a mixture of aliphatic hydrocarbons that do not dissolve plastics. Before using 

the cleanser for all surfaces we recommend carrying out tests. Do not use 

cleansers containing abrasive substances.
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3.2. Cleaning Stainless Steel Components

Avoid using cleansers containing any corrosive chemicals, e.g. bleach 

(including chlorine). Do not use cleansers containing abrasive substances. 

Always remove the dirt using microfiber cloth to avoid damage of protective 

coating. 

In case of a daily maintenance:

1. Remove the dirt using cloth dipped in warm water.

2. For best results, add a little bit of dishwashing detergent.

3.3. Cleaning Powder-Coated Components

For preliminary cleaning process stage you need running water or wet sponge 

featuring large holes, this will help you to remove loose, heavy dirt. Do not use 

cleansers containing abrasive substances. Next, using cloth and cleanserwater solution (soap, dishwashing liquid) gently rub the cleaned surface.

Avoid using cleanser without water since it may result with damage of the 

cleaned surface, please mind that large amount of water mixed with cleanser 

is a must.

3.4. Cleaning Aluminium Components

While cleaning aluminium components use products acid by nature, e.g. spirit 

vinegar, lemon. Do not use cleansers containing abrasive substances. Avoid 

using hard brush, this may cause scratches. 

It is recommended to use microfibre cloth. While polishing the surface use 

circular movements. Use clean, dry cloth to make the surface shine.

4. SERVICE AND REPAIR 

In case of any sign of damage, it is necessary to disconnect 

the device form the mains immediately. The damaged 

component must be replaced or repaired by RADWAG 

service directly.

In case of any problems with correct operation of the scale, contact the closest 

manufacturer's service point. In case of defects, deliver the faulty product to the 

manufacturer's service point. If the product cannot be delivered to the 

manufacturer's service point, call the service and report the defect. Repair 

scope and method will be set up.
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The user is NOT ALLOWED to carry out any kind of repair 

of the device himself/herself. Any attempt of scale 

modification, repair etc., by unauthorized persons, will result 

with loss of validity of manufacturer-issued certificates, 

declarations and warranty.

5. RECYCLING

HY10 scales must be recycled, they are not to be treated as a regular 

household waste. Scales to be decommissioned must be decommissioned 

in accordance with valid legal regulations.

6. MECHANICAL DESIGN

6.1. Dimensions

Figure 1. Dimensions of WTC 200 scale
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Figure 2. Dimensions of WTC 600, WTC 2000, WTC 3000 scale

6.2. Connectors Arrangement

Figure 3. Connectors view 

DC IN – power supply socket

RS232 - RS232 connector

USB 2 - USB „device” connector

USB 1 - USB „host” connector

6.3. RS232 Connector

RS232 (1) connector DB9/M (male)

Pin2 – RxD

Pin3 – TxD

Pin4 – 5 VDC

Pin5 – GND
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6.4. Operation Panel

Figure 4. Operation panel of WTC series scales

Keys:

Press to switch the weighing device on/off – hold the key for about 1 

second.

Function key, press to change the working mode.

Press to send the weighing result to a printer or computer.

Press to zero the scale.

Press to tare the scale.

Upon pressing + keys combination, functions 

of given keys change. Detailed information concerning use 

of + keys combination is to be found further down 

this manual.

7. INSTALLATION

7.1. Unpacking and Installation

 Unpack the device and place it on a flat and even surface. Keep it far 

away from any sources of heat.
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 Install the weighing pan and the draft shield, follow figure 5.

Figure 5. Scale assembly

7.2. Levelling

To level the weighing instrument turn its feet. Keep turning the feet until the air 

bubble takes central position:

7.3. Connecting the Scale to the Mains

The weighing device can be connected to the mains only with a power supply 

that comes standard with the particular model. Nominal voltage of the power 

supply (specified on the power supply data plate) has to be compatible with 

the mains nominal voltage.

Procedure:

 Connect the power supply to the mains. Plug it to the power supply socket 

(back side of the scale housing).

 Press key. The key is also used to switch the scale on/off.
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 Display test proceeds (all symbols are backlit for a moment), program 

name and number is displayed first, ZERO indication with reading unit 

next (displayed reading unit is conditioned by scale type). 

 In case the weighing result is not zero after indication stabilisation, press 

key.

7.4. Warm-Up Time

 For correct scale operation, the workroom temperature must range 

between +15C  +30C.

 It takes 30 minutes for the device to warm up.

 During the thermal stabilization, the indications on the screen can change.

 If you want to carry out adjustment operation, make sure that your device 

is thermally stable.

 Temperature and humidity variations during operation may cause 

indication errors. To remove the indication errors perform user adjustment.

7.5. Battery Charge Status

The scale of standard design is equipped with an internal battery. Battery state 

is signalled by pictogram, the pictogram is displayed in the top bar of the 

display.

pictogram display mode Meaning

No pictogram Battery charged. Regular scale operation.

Pictogram displayed continuously Too low battery charge (the scale is about to shut 

down). Charge the battery immediately.

Blinking pictogram, blink frequency: 

ca. 1 s

Battery charge in progress. The device is connected 

to the power supply charging the battery.

Blinking pictogram, blink frequency: 

ca. 0.5 s Battery error. Battery is damaged.

7.6. Battery Charge Status Check

 Press and keys combination. 

 Depending on the battery state, a respective status is displayed on the 

screen for 2s:

80% Battery power supply. Battery power given in %.

CHArGE Battery charge in progress. The device is connected to the power supply 

charging the battery.
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-Err5- Battery error. Battery is damaged.

 Next, the home screen is displayed automatically.

8. OPERATING THE MENU

In order to navigate the program menu use the operation panel.

+ 

Press to enter the main menu.

+ 

Press to enter tare manually.

Press to enter tare from tare database.

Press to change value by 1 digit up.

Press to scroll the menu up.

+ 

Press to check battery/accumulator state.

+ 

Press to view date/time.

Press to scroll the menu down.

Press to change current parameter value.

Press to enter given submenu.

Press to modify given parameter.

Press to confirm modification.

Press to exit, function remains unmodified. 

Press to move one menu level up.

8.1. Return to the Weighing Mode

Introduced menu modifications are automatically saved to scale memory upon 

return to the home screen. To return to the home screen press key 

repeatedly.

9. WEIGHING

Load the weighing pan. Read the result when stability marker is displayed.

To assure long-term operation and correct mass measurements, follow 

the rules presented below:
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Load the weighing pan steadily 

avoiding mechanical shocks.

Place weighed loads centrally on the 

weighing pan (eccentricity errors are 

specified by EN 45501 standard, point 

3.6.2.).

Do not apply concentrated force (total 

load in one point).

Avoid side loading, in particular side 

shocks.

10. DIAGRAMS OF CONNECTION CABLES

Figure 6. Scale – computer cable
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Figure 7. Scale - printer cable (EPSON)

11. TECHNICAL SPECIFICATIONS

For technical specifications of respective scales go to RADWAG website 

www.radwag.pl. 

12. TROUBLESHOOTING

Problem Cause Solution

Scale start-up fail.

Power supply disconnected. Connect the power supply to the scale.

Battery discharged. Connect the power supply to the mains, 

charge the battery.

No battery (not installed or 

installed incorrectly).

Check if the battery is installed correctly 

(polarization).

The scale switches 

off automatically.

<7.4.t1> parameter set to 

value enforcing scale shutdown after particular time 

interval.

Go to <P7.Othr> menu, set <7.4.t1> 

parameter to 'nonE' value.

During the start-up, 

message 'LH' is 

displayed.

Weighing pan loaded during 

the start-up.

Unload the weighing pan. Zero indication 

is displayed.

Communication with 

the computer not 

established.

Incorrect computer port set in 

parameter <5.1.1.Prt>.

Enter < P5.ducE / 5.1.PC> submenu and 

set correct <5.1.1.Prt> parameter value.

Incorrect transmission 

parameters for the selected 

computer port.

Enter <P4.Conn> menu and set correct 

transmission parameters for the selected 

computer port.

Incorrect printout frequency 

for continuous transmission.

Enter < P5.ducE / 5.1.PC> submenu and 

set correct <5.1.3.Int> parameter value.
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No printout on a 

scale-connected 

printer.

Incorrect printer port set in 

<5.2.1.Prt> parameter.

Enter < P5.ducE / 5.2.Prtr> submenu and 

set correct <5.2.1.Prt> parameter value.

Incorrect transmission 

parameters for the selected 

printer port.

Enter <P4.Conn> menu and set correct 

transmission parameters for the selected 

printer port.

No variable declared in 

weighing printout project.

Enter <P6.Prnt / 6.2.GLP> submenu and 

declare variables that are to be printed.

Communication with 

the additional display 

not established..

Incorrect additional display 

port set in <5.3.1.Prt> 

parameter.

Enter < P5.ducE / 5.3.AdSP> submenu 

and set correct <5.3.1.Prt> parameter 

value.

Incorrect transmission 

parameters for the selected 

computer port.

Enter <P4.Conn> menu and set correct 

transmission parameters for the selected 

additional display port.

Displayed mass unit 

does not comply with 

the scale data plate.

Changed scale start unit in 

<9.1.UnSt> parameter.

Enter <P9.Unit / 9.1.UnSt> submenu and 

set unit complying with the scale data 

plate.

Changed custom unit in 

<9.2.Unin> parameter.

Enter <P9.Unit / 9.2.Unin> submenu and 

set unit complying with the scale data 

plate.

13. ERROR MESSAGES

- E r r 2 - Value beyond zero range.

- E r r 3 - Value beyond tare range.

- E r r 4 -

Adjustment weight or start mass out of range (1% for adjustment weight, 10 for 

start mass).

- E r r 5 - Battery error. Battery is damaged.

- E r r 8 -

Time of the following operations exceeded: taring, zeroing, start mass 

determining, adjustment process.

- n u l l - Zero value from converter.

- F U L L - Weighing range exceeded.

- L H - Start mass error, indication out of range (10% of start mass).

- H i - Display range of total mass on scale display exceeded in 'Totalizing' mode.

- u L o - Too low battery charge. The scale is about to shut down.

- E r r L o -

- Determined mass of single part in 'Parts counting' mode too small.

- Value of 'Min' threshold is greater than value of 'Max' threshold in '+/- control' 

mode.

- E r r H i -

- Entered value of single part greater than maximum capacity in 'Parts counting' 

working mode.

- Entered value of 'Max' threshold greater than maximum capacity in '+/- control' 

mode.

- Entered reference mass greater than maximum capacity in 'Percent weighing' 

mode.
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