VWO’s multi channel wireless weighing systems RCB5000, is designed for a
reliable transmission of all types of weighing systems over distances up to 3000
m in industrial environment, it is enabling a significant
reduction in all types of control and measurement cables between units and the
The
receiver part of RCB5000 systems can be used to read up to 64 weighing systems.
Principle
The basic RCB5000 weighing system includes a transmitter unit and a
receiver unit for up to 200m.
The radio units can communicate in unidirectional or bi-directional mode using
a single frequency (technology based on a transceiver).
The transmission systems use a technology based on our extensive
experience in this field (+/- 15 years), i.e. tried and tested in industrial
applications such as steel works and foundries and in an environment where the
electromagnetic interference may be very strong.
They operate either in the frequency band 433.100 to 434.700Hz (license-freefrequency) using a low power output (less than 10mW) as standard, in order not
to interfere with other radio controlled applications on the client’s site.
Specifications
|
Linearity |
<0.002% FS |
< 0.001 % FS |
< 0.002 % FS |
|
|
Load cell excitation (6 wire
technique) |
5 V DC |
5 V DC |
5 VAC, 86 Hz |
5 V DC |
|
Minimum load cell impedance |
350 Ω (87.5 Ω at supply 12-14 |
250 Ω |
350 Ω; (87.5 Ω at supply 12-14 |
|
|
Maximum analogue input range |
±11 mV (bipolar, for weighing applications, force and torque
measurements) |
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|
Min. input per verification scale
interval (vsi) non approved / approved |
0.1 μV / 1.0 μV |
0.1 μV / - |
0.02 μV / 0.1 μV |
0.05 μV / 0.7 μV |
|
Resolution |
internal / external (counts) |
±260.000 / ±100.000 |
±520.000 / ±1.000.000 |
±260.000 / ±100.000 |
|
A/D converter |
±17-Bit |
|
±20-Bit |
±18-Bit |
|
Conversion |
rate in meas. per second int./ext. |
90 / up to 90 |
172 / up to 172 |
2400 / up to 600 |
|
Digital filter (Hz) |
0.02 - 5 / 8 steps |
|
0.2 - 3 / 6 steps |
0.25 - 18 / 2,5 - 19,7 |
|
Filter Mode |
Bessel |
|
Bessel / Gauss / Butterworth |
FIR / IIR | 8 steps each |
|
Calibration |
software calibration and set up |
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|
Sensor curve linearisation |
- |
7 nodes |
- |
|
|
Computer interface |
RS485 or RS232, half duplex, 9600 Baud; bus capability up to 32
devices (RS485) |
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|
Transmission |
433.100 to 434.700Hz (licence free) |
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|
Weighing functions |
zero, gross, tare, net, filter etc. |
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|
Digital inputs, opto-isolated, 10 … 30
V DC, max. 3 mA |
2 |
- |
2 |
|
|
Digital outputs, open collector, <
30 V DC, max. 200 mA |
2 |
- |
2 |
|
|
Temperature effects on zero, typical /
max. (/°C) |
5 ppm / <10 ppm |
15 ppm / <30 ppm |
1 ppm / <2 ppm |
5 ppm /<10 ppm |
|
Temperature effects on span, typical /
max. (/°C) |
3 ppm / <5 ppm |
8 ppm / <15 ppm |
0.8 ppm / <2 ppm |
6.4 ppm / <8 ppm |
|
Temperature range |
–10 °C to +50 °C (compensated); –20 °C to +60 °C (storage) |
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|
Enclosure |
Receiver 118x88x50mm / Weighing transmitter 157x88x50mm |
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|
Dimensions |
82 x 31 x 6 mm, weight approx. 30 g; with adaptor board 99 x 41 x 12
mm, approx. 50 g |
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|
Power supply |
24 |
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|
Standarts |
R& Radio spectrum (R& OIML R-76 and Safety :
EN60204-32: 1998 + EN954. |
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Transmission
reliability and safety in use
The RCB5000 weighing units have control
systems and codes designed to ensure a high level of reliability against
interference or interruptions, which could be caused by other radio frequency
sources on the site, by means of the following :
·
Address codes
identifying the RCB receiver and transmitter (32-bit codes)
·
In the event of
interference, the transmission channel can easily be re-programmed by PC on
site, 64 channels are available.
·
Up to 64 weighing
transmitter and 1 receiver unit.
References for equipment of this type
Wireless equipment of this type has recently been installed by:
ArcelorMittal Steel plant, Sidmar Steel plant, Riva Steel plant, Corus steel
plant, Manoir industries, Burgo Ardenne paper plant , Au
