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Vibrating Wire Strain Gauges

Model 4100 › 4150 › 4151 Miniature Strain Gages
The Model 4100/4150 Strain Gage has a 51 mm gage length (3000 με range, 1 με sensitivity) and is designed to measure strains in steel structures (4100) and on reinforcement bars (4150) where space may be limited. The gage is installed quickly and easily by means of a capacitive discharge spot welder or, for short-term use, with special epoxy adhesives. (The 4151 Strain Gage Series offers extended ranges, 5000 or 10,000 με, for use in high strain regimes).

 
Specifications: 
Standard Range
3000 με
Resolution 0.4 με
Accuracy ±0.5% F.S.
Nonlinearity < 0.5% F.S.
Temperature Range −20°C to +80°C
Active Gage Length 51 mm
   

Model 4200 › 4202 › 4210 Concrete Embedment Strain Gages
These Strain Gages are designed for direct embedment in concrete. The 4200 (standard model) has a 153 mm gage length and 1 με sensitivity and is commonly used for strain measurements in foundations, piles, bridges, dams, tunnel linings, etc. The 4210 has a 250 mm gage length making it particularly suitable for use in large aggregate concrete. The 4202 is designed for laboratory use and/or where there are space limitations. Low modulus versions, for measuring concrete curing strains, are also available (please contact Geokon, Inc. for details).

Specifications:
Standard Range
4200                   4202                   4210
3000 με               3000 με              3000 με
Resolution 1.0 με                   0.4 με                0.4 με
Accuracy ±0.5% F.S.          ±0.5% F.S.          ±0.5% F.S.
Nonlinearity < 0.5% F.S.          < 0.5% F.S.       < 0.5% F.S.
Temperature Range −20°C to +80°C    −20°C to +80°C   −20°C to +80°C
Active Gage Length 153 mm                51 mm                250 mm
   
 

Model 4000 Arc Weldable Strain Gage
The Model 4000 Strain Gage is designed primarily for arc welding to steel structures such as tunnel linings, excavation bracing, piles and bridges. The gage has a 150 mm gage length (longer or shorter versions are also available) a 3000 με range and a 1 με sensitivity. The gage can be adapted for bonding to concrete or for bolting to steel surfaces by modification of the end blocks.

Specifications:
Standard Range
3000 με
Resolution 1.0 με
Accuracy ±0.5% F.S.
Nonlinearity < 0.5% F.S.
Temperature Range −20°C to +80°C
Active Gage Length 150 mm