Resistance strain gauge ECV-SA/CLS

electromagneticdigitalvibrating wire

WHAT DOES IT DO? The ECV vibrating wire strain gauge allows to detect deformations in structural elements such as: foundation piles, slabs, diaphragms, bulkheads, dams, tunnel linings or more generally on load-bearing structures. This strain gauge can work indifferently in both traction and compression and being watertight, it can be applied externally to stressed metal structures or embedded in concrete castings for stress measurements. STRENGTHS Reliability even for long-term monitoring; High accuracy and resolution; Built-in thermistor; IP68 protection grade; Surge resistant; Possibility to transmit the signal even over long distances (immunity to external EM disturbances); Vibrating wire strain gauges have a steel wire stretched between two disks. The ends of the wire are anchored to ensure excellent long-term stability. An electromagnetic coil (separable from the sensor) placed near the string induces vibrations that are then converted into electrical signals whose frequency is inversely proportional to the length of the string. The variations in the length of the string, due to the load or deformation to which the element of the structure under examination is subjected, modify the frequency of the signal whose measurement, expressed in microstrain (µε) or other available units of measurement, occurs via a digital reading unit. The deformation is therefore linked to the variations in the resonant frequency of the vibrating string, a frequency which is then detected by a reading/acquisition unit, therefore the variations in the length, resistance or temperature of the cable are connection have a negligible effect on the signal,