Transmitter WST


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Digital weight transmitter for load cells with RS232/RS485/USB interface fully configurable (protocol, continuous transmission/master-slave, Modbus RTU, serial parameters).

Optional interfaces: Ethernet and Profibus DP by connection with external converters. Calibration procedure with sample weights or automatic theoretical. Possibility to select normal or fast weight acquisition. 3 Diagnostic status and communication lines LED lights. STAND ALONE configuration of the main parameters via DIP-SWITCH for fast setup and independently from PC. Configuration via PC application for calibration and detailed configuration of parameters.

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Transmitter WST

Technical Specifications

Power supply10 30 V dc
Max power consumption1 W
IsolationClass II
Installation CategoryCategory II
Operating temperature-10 / +50 C (14 / 122 F) Humidity Maximum 85% non-condensing
Storage temperature-20 / +60C (-4 / +140F)
Overall dimensions55 x 90 x 58 mm / 2.16 x 3.54 x 2.28 in (l x h x p)
MountingOn OMEGA rail
Case materialNoryl UL 94 V-0,self-extinguishing
ConnectionsRemovable screw terminals. Pitch screws terminal blocks 5.08 mm
Power supply load cells5 V dc, maximum 4 cells
Linearity< 0.01% of full scale
Temperature deviation< 0.001% of full scale/C
Internal resolution24 bit
Measuring range-3.9 mV/V - +3.9 mV/V
Weight acquisition frequency10 Hz - 80 Hz
Digital filter0.2 Hz - 50 Hz
Number of weight decimalsfrom 0 to 4 decimal digit
Zero / FS CalibrationExecutable through buttons
Serial portCOM1: Rs232c half duplex COM2: Rs422/Rs485 half duplex USB: Device, full speed. Driver per virtual COM port per PC,fornito con l'applicazione
 Max. cable length15m (Rs232c) e 1000m (Rs422 e Rs485)
 Serial protocolsASCII, continuos printable, MODBUS
 Baud rateUp to 115200 b/s, (default 9600 b/s)
Conforms to standardsCompliance to EMC norms: EN61000-6-2, EN61000-6-3, Compliance electric safety: EN 61010-1
For the complete and latest technical specifications, please refer to the technical data sheet which can be downloaded here:
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Connections

TypeWST terminal block
Length15 m
1+ 10 30 Vdc
2GND
3RS232 Tx
4RS232 Rx
5RS485 +
6RS485 -
7- Exc. Load cell
8+ Exc. Load cell
9+ signal load cell
10- Signal load cell
11- Signal load cell
12+ signal load cell
Connections  Transmitter WST

MOUNTING OF THE LOAD CELL

General precautions to be followed in the installation and assembly of load cells:

  • Follow the direction of application of force on the load cell
  • Do not exceed the limits of the temperature as indicated in the data sheet
  • Do not remove labels from the load cell
  • Adequately protect the cables with sleeves or channels
  • Carry out on each load cell a ground connection with suitable cable, shunt on mounting accessories
  • Do not carry out any welding on the mechanical structure after mounting the load cell
  • Avoid or reduce to a minimum level any mechanical constraints between the rigid structure and the weighing structure to avoid error in weighing and return to zero
  • In case of vibration or dynamic loads product the load cells with puffers / shock absorbers
  • Protect load cell from any dust accumulation with any appropriate means