Product description

The 1230B Biaxial Vibrating Wire Embedded Strain Gauge is designed for accurate strain monitoring in concrete and structural applications where biaxial strain information is required. The instrument uses a vibrating wire sensing elementhoused in a robust body. Mechanical strain causes a change in the wire’s tension and therefore its resonant frequency, which is measured and converted into engineering units.

Key features

• Biaxial measurement capability (two orthogonal directions)
• Long-term stability and repeatability
• Waterproof construction suitable for harsh environments
• Corrosion-resistant materials
• Temperature compensation via integrated thermistor

Applications

• Mass concrete structures (e.g., dams)
• Reinforced concrete elements
• Shotcrete applications
• Tunnel linings
• Structural monitoring programs requiring biaxial strain evaluation

Technical Specifications

• Measurement range: ±3000 µε  
• Resolution: 0.5 µε  
• Accuracy: ±0.1% F.S. (Full Scale)  
• Temperature range: -40 °C to +105 °C  
• Sensor material: Stainless steel  
• Overall length (1240): 153 mm  
• Overall length (1230B Biax.): 77 mm  
• Overall length (1235 Mini.): 54 mm  

Details

Standard Model
The standard VW embedded strain gauge is designed to measure stress in reinforced concrete and mass concrete. By installing 2 to 4 VW embedded strain gauges in different orientations on suitable members, you can measure the magnitude, directional distribution, and trend of strain. Once embedded in structures such as dams and embankments, the gauges can be used to understand the strain behavior of the structure.  

Biaxial
The biaxial model is highly useful for accurate measurement of biaxial true stress in reinforced concrete, mass concrete structures, and shotcrete applications.  

Miniature
When installation conditions are constrained, the ultra-compact miniature model strain gauge can be used very easily.  

SIS 1000 Model

• Manufacturer: Systel Instrumentation  
• Measurement range: ±1500 µε  
• Resolution: 1 µε  
• Accuracy: ±0.1% F.S.  
• Temperature range: -20 °C to +80 °C  
• Sensor material: Stainless steel  
• Overall length: 120 mm