Vibrating Wire Digital Converter
Model : VW-RS485
It is precise smart converter from VW analog input to Digital output RS485.
A node can read 4EA VW and 4EA Temperature signals.
The VWRS485 signal converter can read out all types of vibrating wire transducers of sweep Hz range 450 to 6000.
It is able to connect multiple daisy chain VWRS485 signal converter up to 32EA so It helps easy many VW data collecting through one line communication cable.
Simply input, A PC can read and record 128EA VW and Temperature.
128EA = 4channels x 32nodes
Compact design allows stable data gathering. In particular, individual signals can be collected filtering to make low noise level.
The end user can record data direct to a PC or collect data through a data logger which can support Modbus RTU function. There are two mode before placing an order.
Modbus RTU mode / Geovan PC program
Monitoring Structure
Geovan PC Program allows you to automatically collect and record data at regular intervals. Modbus RTU can be used by connecting to a data logger, RTU, PLC or PC. You must choose the protocol between Geovan PC or Modbus before shipping the product. The Rom writer sold separately helps to set up firmware by yourself in case of amended internal protocol. If you set up FTP on your PC, You can have access into the data at any time even from remote places.
Specification
| PCB Size |
80 x 58 x 11mm |
| Maximum number of connectign converters by Daisy Chain |
32Ea |
| Number of Reading Channel(Differential Measurement) |
Vibrating Wire 4EA, NTC Thermistor 4EA |
| Selectable Input Power Level |
12Vdc or 5Vdc selection, Default 12Vdc |
| Adjustable Reading Interval |
1minute to 720minutes |
| Selectable Reading Count for Average |
1 to 5 times |
PCB Details
#1 for vibrating Wire Sensor Wiring
- +,- for VW Sensor Signal
- T1, T2 for Temperature Reading
- No Polarity of VW and Temperature
- E for Shield Wire Earth(Ground)
#2 for RS485 Signal Wiring(Output
- +,- for power supply 8Vdc to 15Vdc
- It has polarity. Becareful wiring +,-
- A+B- for RS485 signal converter
- E for Shield Wire Earth(Ground)
#3 for Power Selection
- 12Vdc power range from 8Vdc to 15Vdc
- 5Vdc should be constant 5Vdc exactly.
- If not, the PCB will be serious damaged.
#4 for Firmware Coding Port by Rom writer
- Send Modbus RTU or RS485 geovan protocol through the port.
Mode of Vibrating Wire
Display
mode |
Item |
Calculation |
Units |
Frequency
Sweep(Hz) |
| A |
All |
Frequency |
μ seconds |
450~6,000 |
| B |
Load cell, TPC, Piezometer |
F2 x 10-3 |
Digits |
1,200~3,500 |
| C |
Arc weldable strain Gauge |
F2 x 10-3 x 4.062 |
μStrain(ε) |
450~1,000 |
| D |
Embedment strain Gauge |
F2 x 10-3 x 3.304 |
μStrain(ε) |
450~1,000 |
| E |
Spot weldable strain Gauge |
F2 x 10-3 x 0.39102 |
μStrain(ε) |
1,000~3,500 |
| Temperature |
NTC 3kΩ at 25°C |
Table Sheet |
Thermistor |
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