VW DISPLACEMENT GAUGE VWDT-6000
The VWDT-6000 series of spring-loaded vibrating wire displacement transducers which cover displacement ranges up to 75mm and are fully waterproof to a minimum of IP68 (16 bar external pressure). They can be incorporated into many displacement products such as crack joint meters, convergence meters, soil extensometers and displacement meters.
VWDT-6000 transducers are particularly rugged and are carefully constructed and thermally aged to minimise long term drift and changes in calibration. The gauges will withstand demanding environmental factors encountered in Civil Engineering construction sites such as tunnels and piling applications.
The data from the VWDT-6000 can be monitored by means of a portable read-out unit or connected to a data logger and distributed if required by telemetry.
Vibrating wire instruments output a frequency signal and are therefore insensitive to resistance changes in connecting cables caused by contact resistance or leakage to ground. Cable may be readily and simply extended on site without special precautions. Gauges may be read up to 1000 meters away from their installed location, without change in calibration.
Instruments may be read by any commercially available Vibrating wire readout system operating on either the pluck pulse or swept frequency excitation principle, provided that these units operate over the frequency range of the instruments. In addition, these instruments can be data-logged by a variety of data-loggers equipped with vibrating wire excitation modules including Campbell Scientific and Datataker, units.
Units are supplied with a ball end to ensure minimum contact point to ensure accurate readings.
| Brands | Geosense |
|---|---|
| Range | 12.5, 25, 50, 75mm |
| Excitation | Pluck or swept frequency |
| Thermistor | 3k Ohms at 25 °C |
| Resolution | 0.025% FS |
| Accuracy | ±0.1% FSO |
| Non linearity | <0.5% FS |
| Operating range | -20 °C +100 °C |
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