IGI - Model IG 1100/120 -Vibrating Wire Strain Gauges

• Monitoring strains in dams and embankments during and after construction
• Mesurement of in steels structres supporting tunnels and underground cavities.
• In pile testing.
• In pressure shafts and wye sections.
• In road sections.
• In high rise buildings.

Innovative series IG1100/1200 strain gauges have a unique integral magnet design which incorporates a miniature magnet coil assembly positioned inside a stainless steel tube of diameter 15mm. The same tube has a high tensile strength, heat-treated and tempered steel wire stretched between two end blocks. The wire is sealed in the tube by means of a set of double O-rings. This feature, when compared to conventional externally mounted magnet design has the following advantages:

Robust and sturdy construction.

High sensitivity and reliability.

Long term stability.

Easy installation and minimum protection needed after installation.

Externally mounted magnet assembly on the other hand is prone to corrosion as it is made in two halves, which are externally clamped on to the tube. This does not ensure proper sealing at the joint. Thus water can seep and with time cause corrosion on the magnet, resulting in failure.

Embedment type strain gagues are provided with built in stainless steel flanges while the groutable and arc weldble type have the same design.

By the use of appropriate type of mounting blocks, the same strain gauge can be arc welded on to the steel structres such as tunnel linings and supports or grouted or epoxy bonded on the surface concrete structures.

To take care of sapce limitation, for verticle measurement of strain across thin concrete lining, embedment starin gauges with 55mm gauge length are used. for eg. on pavments. provision of gas discharge tube the sansor against surge and lightning.

No-Stress Strain  

No stress strain gauges are embedment type strain gages provided with a hollow container. these are used to monitor strain produced due to factors other than load for eg. temprature or chemical changes in concrete.