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The VWlog2 is a simple, rugged, low-power, 2 channel Datalogger which reads most commercially available geotechnical and structural Vibrating Wire (VW) sensors and optional thermistor temperature sensors.

The VWlog2 is a simple, rugged, low-power, 2 channel Datalogger which reads most commercially available geotechnical and structural Vibrating Wire (VW) sensors and optional thermistor temperature sensors.

VWlog2 contains a large internal memory of 4MB, enabling storage of up to 50,000 readings per channel. The internal memory operates as a USB mass storage device which is accessible through a mini USB interface, allowing data to be easily transferred to a PC or mobile device via drag-and-drop.

The included VWlog2 software, enables the user to easily setup the logger parameters, such as date and time, sweep frequency range and excitation voltage.

VWlog2 is housed in a waterproof enclosure, providing a rating of IP66 and all electronics are encased in an impervious sealing compound to avoid water damage.

 

Product Features 

  • Reads two Vibrating Wire (VW) sensors and combined thermistor temperature sensors
  • 4MB internal memory; reads up to 50,000 readings per channel, equating to 5 years of data sampling at hourly intervals
  • IP66 rated, rugged, die-cast aluminium enclosure
  • Low power requirement; 2 x D Cell batteries last up to two years
  • Easy configuration and firmware upgrade via mini-USB to USB cable
  • True USB interface; data downloaded via drag-and-drop
  • Reads with user definable frequency range (1700 to 6000 Hz)

Product Benefits

  • Reads most types of commercially available Vibrating Wire (VW) sensors
  • Optional 15V excitation ensures quality readings from sensors with long cables
  • Ideal for long-term monitoring in harsh and damp environments
  • Allows data collection immediately after sensor installation
  • Fast setup and download time
  • Versatile and economical
  • All electronics sealed to protect from static and water damage
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Operation

Before going to site, a configuration file is created using the VWlog2 software provided by Soil Instruments.

The included VWlog2 software allows the user to easily create the configuration file, setting up the logger parameters such as date and time, sweep frequency range and excitation voltage.

On site, two Vibrating Wire sensors with optional thermistor temperature sensors are connected to VWlog2. As soon as the batteries are fitted, VWlog2 will start reading and storing data according to the previously specified settings in the configuration file.

The data is saved onto the VWlog2 internal memory in CSV format and is easily retrieved via a mini-USB to USB cable.

Once connected, VWlog2 appears as an external USB drive allowing data to be easily transferred from VWlog2 to a PC or mobile device via drag-and-drop, using the same action as a file on the PC’s hard drive.

The VWlog2 reads the Vibrating Wire sensors using ‘Zero Crossing’ which is a signal processing method that calculates the frequency of a waveform by detecting and counting the number of times the signal crosses zero, or changes sign.

Applications

VWlog2 can be used to read Vibrating Wire (VW) sensors for geotechnical and structural monitoring.

Typical monitoring applications include:

  • Pore pressure
  • Water level
  • Displacement
  • Crack
  • Load
  • Pressure cell