Embedded vibrating wire
The vibrating wire strain gauge is widely used for measuring strain in concrete,
This instruments guarantees long-term accuracy and stability.
Thanks to the frequency signal, it is not affected by the length of the cable.
A thermistor for measuring the temperature is embeddeed in the instrument.
The vibrating wire strain gauge functions is the following way: a steel wire is held between 2 mounting blocks fixed to the surface being measured.
Any deformations in this surface will after the tension in the steel wire and, thus, the consequent resonant frequency.
When the wire is energized with an electrical input, an internal electromagnetic coil gauges the resonant frequency and, consequently, its tension, thereby measuring deformations in the body surface.
This instrument is used for the measuring strain in definitive lining concrete, the inverted tunnel arch and the concrete of foundation and wall piling.
- Type of transducer: vibrating wire;
- Nominal measuring range: 3000 me;
- Sensitivity: 1 me;
- Accuracy: <0.5% F.S.;
- Operating temperature range: from -20°C to +80°C;
- Temperature sensor: incorporated NTC 3 KW;
- Coil resistance: 150 W;
- Typical frequency: 800 Hz;
- Coefficient of thermal expansion: 12,2 me/°C;
- Output signal: Hz
- body lenght (A): 23 mm
- body diameter (B): 21 mm
- total length of gauge (C): 156 mm
- diameter of mounting block (D): 19 mm
- thickness of mounting block (E): 3 mm