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E31.2 E32.2

Vibrating Wire Strain Gauge - Spot Weld

Strain Gauge, Spot Weld, VW, Vibrating WireStrain gauges offer the ability to measure the effect of loads, settlement or other changes in a structure. They record strain, which is a dimensionless measure of deformation. Stress is related to strain by a material’s properties and is predictable within a certain range of applied strain.
Strain gauges are useful for determining the effects of applied loads to a structure.
Geosense® VWS-2020 series vibrating wire strain gauges are designed primarily to measure strains on the surface of steel structures but may also be used on other types of material. VWS 2020 strain gauges are available as a gauge with integral coil housing, or a gauge only with separate coil housing.

Features

  • Small size 
  • Can be used in confined spaces 
  • Easily tensioned on site 
  • Reliable long term performance 
  • Rugged, suitable for demanding environments 
  • Insensitive to long cable lengths. 
  • High accuracy 
  • Integral Thermistor for temperature correction
  • Suitable for remote reading and data logging

Applications

Measurement of stress and strain deformation in:

  • Bridges & Dams 
  • Buildings 
  • Struts and support systems. 
  • Pipelines 
  • Tunnel linings 
  • Piles & Mass Concrete 
  • Reinforcement bars

Avaliable Models

Model VWS-2020 consists of the gauge plus a separate plucking coil housing which is placed over the top of the gauge and secured using stainless steel straps.
The plucking coil housing is made from tough corrosion resistant plastic and also acts as protection to the gauge. It can also be used as a portable readout unit
Model VWS-2025 consists of an integral coil pluck housing which is encapsulated around the gauge.
Model VWS-2026 is the same as 2025 except the end blocks have pins which are designed to be grouted or bonded into holes drilled into the material under test.
For Models VWS-2025 & 2026 a separate cover plate is placed over the gauges to protect them and is secured using stainless steel straps

Specifications

  • VWS-2020 vibrating wire strain gauges may be read by the VW-2106 or any vibrating wire readout device and may be readily connected with data loggers with vibrating wire interface modules.
  • Vibrating wire strain gauges 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 metres away from their installed location without change in calibration.
Type VW S-2020 VW S-2025 VW S-2026
Fixing Method Spot Welding Spot Welding Spot Welding
Coil Type  Separate Integral  Integral
Gauge Length  49 mm 49 mm 49 mm 
Overall Length  65 mm  65mm  65 mm 
Resolution  0.4 με 0.4 με  0.4 με 
Strain Range  3000 με 3000 με  3000 με 
Accuracy  ±0.1% to ±0.5% FS ±0.1% to ±0.5% FS ±0.1% to ±0.5% FS
Non-Linearity  <0.5% FS <0.5% FS  <0.5% FS 
Temperature Range  -20°C to +80°C -20°C to +80°C  -20°C to +80°C 
Frequency Range  1500-3500  1500-3500  1500-3500 

 

Accessories and Customisation

To order VWS-2020 series strain gauges the following information should be specified:

  • Cover, VW, Strain GaugeFixing method 
  • Coil type 
  • Protective cover 
  • Cable length 

The accessories below will speed installation and data collection:

  • Readout or datalogger
  • Tensioning Jig

Readout Systems

 

Custom datalogger systems for any number of sensors in any configuration are also available and can be designed on request. Please see our other data sheets for details of readout equipment, terminal boxes and data loggers specific to vibrating wire devices.

VIC:

Melbourne

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t (03) 9938 3830

m 0428 315 502

NSW:

Sydney

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t (02) 9986 1857

m 0418 381 709

QLD:

Brisbane

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t (07) 3040 6166

m 0419 477 715

WA:

Perth (Head Office)

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t (08) 9322 4020

m 0408 034 668

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