Geokon Vibrating Wire Rebar Strain Gauge

Product Information

Brought to you by Specto Technology, the Geokon Vibrating Wire Rebar (Strain Gauges), featuring the 4911 “Sister Bar” and 4911A weld-in model, are rugged, high-precision sensors designed for monitoring strain in reinforced concrete structures. Ideal for piles, caissons, and foundation slabs. These gauges offer reliable axial and bending strain measurements with built-in thermistors for temperature compensation. Whether welded directly into a rebar cage or installed alongside existing rebar, their robust construction ensures durability during concrete pours, making them a trusted solution for long-term structural health monitoring. 

Product Features 

• Standard Range 3000µɛ 
• Resolution 0.4µɛ 
• Accuracy ±0.25% F.S. 
• Temp. Range -20°C to +80°C  
• Sensor Size 
  • Model 4911: 1,27cm(0.500 in.)  
  • Model 4911A: from 1.59cm(0.625 in.) – 4.45 cm(1.750 in.) 
• Gauge Length  
  • Model 4911A: 1105 mm (43.5 in.)  
  • Model 4911: 914 mm (36 in.) 
• Output (approx.) 1800-2800 Hz 

Product Benefits 

• Long-term stability in difficult environments 
• Waterproof 
• Built-in thermistor 
• High accuracy and resolution 
• Rugged design 

Typical Applications Include 

• Concrete piles and caissons 
• Diaphragm walls 
• Cast-in-place concrete piles 
• Tunnel linings