Description
- Strain gauges are attached to steel or steel-frame structures to measure stress changes caused by excavation or nearby construction activities, helping to assess the stability of retaining walls and temporary structures.
- They can also be embedded in concrete to measure structural deformation and evaluate stability.
- Vibrating wire sensors offer excellent responsiveness and reproducibility, and they are minimally affected by long-term changes, making them ideal for permanent monitoring.
Composition & Characteristic
▣ Components
① Strain gauge sensor
② Cable
③ Protective cover
▣ Features
① Excellent reproducibility and responsiveness, unaffected by cable length or resistance variation
② Completely waterproof structure
③ High stability and high-sensitivity design
④ Built-in high-precision temperature sensor
Specification
SJ-4100 & SJ-4150 Series
| Specification | SJ-4100 | SJ-4150 |
|---|---|---|
| Compatible Sensors | Resonance Type Sensor (V/W Type) | |
| Measurement Range | 1,400 ~ 3,500Hz | |
| Measurement Band | Min 1,000 ~ Max 4,000με | |
| Accuracy | ±0.1% FSR | |
| Resolution | 0.5με | |
| Accuracy | ±0.1% FSR | |
| Linearity Error | ±0.5% FSR | |
| Coefficient of Expansion | 11X10⁻⁶ /°C | |
| Operating Temperature | -20°C ~ 50°C | |
| Built-in Temp Sensor | 180Ω | 50Ω |
| Temp Sensor Working Range |
Thermistor: -20 ~ 50°C | |
| Temp Sensor Accuracy | Thermistor: ±1°C | |
| Material | Stainless Steel 300, Fluorine O-RING & High Density Epoxy Potting | |
| Waterproofing | 100m H2O | |
| Signal Cable | Ø6.4mm, 0.235mm² X 4C Shielded PVC Sheath Cable 2m | |
This product is subject to change without prior notice to improve its quality.
SJ-4150
Product Dimensions & Specifications
| Product Specifications | ||
|---|---|---|
| Length (L) (mm) | 60 | Product Dimensions |
| Gauge Length L(Gage) (mm) | 55 | |
| Sensor Length L(Sensor) (mm) | 51 | |
| Diameter D(ø) (mm) | 6.5 | |
| Weight W (kg) | 0.01 | |
| Protection Cover (mm) | 100 × 11mm | |
Reference
▣ Strain (με) Calculation
- Microstrain (με) = Gage Factor × 10⁻³ × F² = Gage Factor × 10⁹ / N²
Where:
F = measured value in Hz
N = measured value in microseconds
Gage Factor = 0.391
▣ Stress (σ) Calculation
- Stress (σ, kg/cm²) = -1.0 × Strain (ε) × Member Elastic Modulus (E)
▣ Axial Force (P) Calculation
- Axial Force (P, ton) = Stress (σ) × Member Cross-Sectional Area (A) ÷ 1000
▣ Standard Installation
- For steel pipes and struts
