Remote transmission device for vibrating wire (VW) /resonant sensor using a nationwide LPWAN IoT network NB-IoT.
- Input from resonant / vibrating wire (VW) sensor
- Single channel unit (1 VW sensor)
- String oscillation period and thermistor measurement
- Applicable for VW-type sensors:
- Pressure/piezometers (pore pressure, soil moisture and water levels)
- Strain Gauges
- Load & Pressure Cells
- Displacements
- Crackmeters
- Extensometers
- In Place Inclinometers
- Tiltmeters
- External Temperature
- Operating with VW instruments/sensors from producers like:
- DGSI (Nova Metrix),
- Encardio,
- Geosense,
- Gloetzl,
- Innovative Geo-technical Instrumentation,
- Pizzi instruments,
- Roctest (Nova Metrix),
- RST Instruments (Terra Insights),
- SISGEO,
- Soil Instruments (Nova Metrix),
- Systel instrumentation, etc.
- Measured string frequency range 600Hz – 5kHz
- Resolution and accuracy:
- Within range 600-1500Hz, Accuracy: 0.009 %, Resolution: 0,002Hz
- Within range 1500-3000Hz, Accuracy: 0.011 %, Resolution: 0,004Hz
- Within range 3000-6000Hz, Accuracy: 0.010 %, Resolution: 0,006Hz
- The accuracy of the measurement is usually limited by the accuracy of the VW sensor itself and its calibration capability.
- Built-in sensors:
- atmospheric pressure
- temperature
- relative humidity
- detection of condensed water
- accelerometer
- Memory (datalogger) for least 1500 measurements
- > 10 years without battery replacement with 2 transmission and 2-12 measurements a day
- external hat-type antenna (built-in antenna -> model HP1K)
- IP67 protection
- Communication to the nationwide IoT network NB-IoT
- E2E encryption with AES-256 possible
