Product information "Weight Transmitter WTQ"

Weighing Transmitter WTQ

The WTQ is a digital weighing transmitter with a 24-bit A/D converter. It converts the output signals of the connected load cells into a stable weight value. This versatile and extremely reliable weight transmitter for connecting 4 load cells directly (16 load cells in parallel).
The transmitter has both analog and digital outputs, which provide stable measurement information. Communication takes place via an RS-485 interface. Programmable relay outputs and two digital logic inputs are also available as standard. The optional analog output provides an analog signal proportional to the weight, which can be processed by a PLC or a PC.
The WTQ Ethernet2 has two equivalent RJ 45 ports, which are connected as mini-switches. This allows several devices to be connected in a network without an external switch, saving space. One patch cable is sufficient between each device.

Fieldbus transmitter

This transmitter allows, with the industry standards of bus technology, the monitoring of various manufacturing processes and is a cost-effective alternative to comparable electronics from PLC manufacturers.

The variety of available fieldbus interfaces allows easy and safe integration of weighing systems to any automation system. As an option, the industrial measuring amplifier with PLC interfaces and fieldbuses Modbus RTU, Modbus TCP, PROFIBUS DP, PROFINET IO, Ethernet IP, Ethernet TCP/IP, EtherCAT, DeviceNet, CANopen, POWERLINK, CC-Link, IO Link, Sercos III.

modbus_logoprofibus_rgbprofinet_rgb ethernet_ip  canopen-logo 

Features of the weighing transmitter

  • Digital weighing transmitter with PLC interfaces.
  • Space-saving top-hat rail mounting or control cabinet front installation (cut-out 23x96 mm, panel thickness 2.5mm).
  • Wide input voltage range: 12 - 24V DC + / - 10%, + / - 10%
  • Direct connection of up to 4 load cells saves a junction box
  • High measuring rate of the transmitter up to 600 measurements / sec
  • Digital 600Hz filter for even faster measurement results
  • A / D converter: 24 bit
  • Six-digit display with red 7-segment LED's
  • Maximum number of decimals: 4
  • Programmable switching contacts
  • 3 programmable potential free outputs: max. 115V AC / 60mA for control of relays
  • Two digital, optically isolated inputs
  • Interface: RS 485
  • All connections via screw terminals
  • Optional: Analog output, optically isolated, 16-bit (selectable 0-20mA, 4-20mA, 0-10V, 0 - 5V, ± 10V, ± 5V)
  • Optional: Profibus-DP, RS 232


  •     Selectable analog output for current or voltage, optically isolated, 16 bit
  •     (selectable 0-20mA, 4-20mA, 0-10V, 0- 5V, ±10V, ±5V)
  •     Various bus systems: Profibus DP, ProfiNet, Ethernet/ModbusTCP and others


  •     Theoretical calibration with input of cell values possible
  •     Linearized calibration with 5 points possible
  •     Indication of the percentage of the weight on each load cell
  •     Different weight filters selectable
  •     Peak function (PEAK) can be linked to a switch point output of a serial interface, analog output, or display.
  •     Event history: storage of the last 50 events: Calibrations, zero settings, errors, equalizations.
  •     Alarm relay: the outputs can be configured to switch in case of alarm.

Advantage of the WTQ weighing transmitter

The biggest advantage of the weighing transmitter is the possibility of direct connection of 4 load cells. No cable box is required. In addition, the direct connection of the load cells offers diagnostic possibilities
- Measurement and monitoring of the load distribution (e.g. in a silo scale to monitor the pile formation)
- Zero diagnosis (if the weighing system is completely descaled)
- Digital equalization of strain gauge load cell signals (individually)

Faster cycle times provide faster and more accurate measurement results. (600 measurement queries / second)


The WTQ transmitter has a 6-digit weight and service display. The easy-to-read, bright LED display allows the weight value to be checked directly on site.
The four operating keys can be reached behind a hinged acrylic glass plate at the front.
4 load cells can be directly connected to the removable screw and terminal strip. A junction box is not necessary. Both 4- and 6-wire load cells can be connected.
The transmitter is designed for mounting on the standard top hat rail. The narrow design allows the installation of several devices next to each other. Panel mounting is also possible (mounting kit included in delivery).

Weighing technology - Legal for trade

The WTQ series weighing transmitters are legal for trade according to OIML calibration class III and IIII. The weighing function is approved with up to 10,000 parts.
Calibration and function setting is easily done via the keypad.
There are 3 types of calibration available:
A Theoretical Calibration - without weights - here the load cell range (mV/V) is entered directly.
For a linear calibration, 5 load points are available.
And a classical two-point calibration - zero point and nominal load point.

Technical data

A/D converter 4 channels; 24 bit (16,000,000 parts) 4.8 kHz
Load cell supply 5 V DC / 240 mA
Leistung 5 W
Supply voltage of the inputs 5- 24 VDC
Max. Counter steps ± 999999 (with measuring range +/-10mV = rec. 2mV/V) ♦ 0.01µ/d
Linearity < 0,01% of range
Temperature drift (of the analogue output) 0,0005 (0,003) % of range / °C
Number of load cells ( connected in parallel) Max. 16 á 350 Ω (4/6-wire technology)
Measuring range ± 39 mV
Max. Sensitivity of the load cells ± 7 mV
Max. Conversions per second

600 conversions/s.

Display 6 digits, 7 segments, LED red + 6 status LEDs
Decimal places 0-4 => 0.01, 0.001, 0.0001
Resolution display - adjustable increments x 1 x 2 x 5 x 10 x 20 x 50 x 100
Keyboard Membrane keyboard with mechanical pressure point, 6 keys
Status symbols Zero, tare, memory status
Measuring range -1mv ~ +14 mv

Keypad with 4 keys to control the scale functions

Digital filter 0,060...7 sec
Conversion rate 5 - 600 Hz
2 x digital optically isolated inputs 2-5 ÷ 24VDC PNP
1 x analogue output; optically isolated, 16 bit

0 / 4 ... +20 mA at max. 300 Ω
-10 / -5 ...0... +5 / +10 V DC at min. 10 kΩ

3 x logical relay outputs 3- 115 VAC / 150mAC
1 x serial interface 485 10 ... 300 Hz (TXRS485 / TDRS485)
Baud rate 2.400, 4.800, 9.600, 19.200, 38.400, 115.200
Operating temperature - 20 ... + 60 °C
Storage temperature - 30 ... + 80 °C
Humidity max. 85% r.H., non-condensing
Transmitter Dimension (W x D x H) 120 x 115 x 25 mm


Typ   Schnittstelle
WTQ RS485 rs485 Serial interface RS-485, up to 32 can be connected in the bus
WTQ Analog 16Bit
 wtq-analogausgang Serial 16 bit interface RS-485, up to 32 can be connected in the bus Analogue output, opto-decoupled selectable:
0-20mA / 4-20mA (max 300ohm) / 0-10V / ± 10V / ± 5V (min 10kohm)
WTQ Profibus DP
 profibus_dp Slave Profibus DP with serial interface RS-485
Baud rate: up to 12 Mbit/s
WTQ Profinet IO 2x
wtq_2xethernet 2 x Profinet IO with serial interface RS-485
Transmission rate: RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
WTQ Modbus/TCP  wtq_1xethernet Slave Modbus/TCP with serial interface RS-485
RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
WTQ Ethernet TCP/IP
 wtq_1xethernet  Ethernet TCP/IP with serial interface RS-485
Slave accessible via web browser
RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
WTQ Ethernet IP 2x
 wtq_2xethernet 2 x Ethernet TCP/IP with serial interface RS-485
works as adapter in Ethernet/IP network
RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
WTQ CANopen  wtq-canopen018a3 Slave CANopen-Anschluss mit serieller Schnittstelle RS-485
Baudrate: 10, 20, 25, 50, 100, 125, 250, 500, 800, 1000 kbit/s
WTQ POWELINK 2x  wtq_2xethernet 2 x Slave POWERLINK port with serial interface RS-485
RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
WTQ EtherCat 2x wtq_2xethernet 2 x slave EtherCAT port with serial interface RS-485
RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)


WTQ 485 WTQ analog WTQ Profibus
wtq-rs485 wtq-indicator wtq-profibus
GSD profibus file
Serial interface RS -485 Serial interface RS -485
Analog output, opto-decoupled selectable: 0-20mA / 4-20mA (max 300ohm) / 0-10V / ± 10V / ± 5V (min 10kohm)
Serial interface RS -485
Slave Profibus DP (max 126 devices with repeater)
  WTQ Profinet 2 WTQ Ethernet
  profinet_rgb ethernet_ip
XML Profinet - 2 Port - file
EDS EthernetIP configuration file

Serial interface RS -485
2 x Profinet IO; RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
Serial interface RS -485
Ethernet/IP; RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
WTQ EtherCAT WTQ Modbus WTQ CANopen
ethercat_logo_778x240 modbus_logo canopen-logo
ESI EtherCAT configuration file
wtq-modbus-tcp wtq-canopen
EDS CANopen configuration file
Serial interface RS -485
Slave EtherCat port
Serial interface RS -485
Modbus/TCP; RJ45 10Base-T (10Mbps) or 100Base-TX (100Mbps)
Serial interface RS -485
Slave CANopen port, max 99 devices
powerlink_logo cc-link_logo sercos_logo
wtq-modbus-tcp wtq-cc-link
CSP CC-link configuration file
Serial interface RS -485
Slave POWERLINK port
Serial interface RS -485
Slave CC-link port, max 64 devices
Serial interface RS -485
Slave SERCOS III port
Product-group: Weighing indicator


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