Strain gauge extensometer EA-FV/AI/IN

WHAT DOES IT DO? The fiberglass rod strain gauge is a system used to monitor the displacement between one or more points located along the axis of a hole and the reference head installed at the mouth (or near the mouth) of the same hole. These strain gauges, often used in multi-base configuration (with multiple rods installed at different depths), are used for the detection of foundation settlements, for deformation measurements in excavations and trenches, for the detection of deformations of bulkheads and piles, and deep movements of rock walls. STRENGTHS Reliable and robust; Very low coefficient of thermal expansion; Easy to install; Prepared for both manual and electrical transducer measurements; DESCRIPTION The instrument consists of a cemented anchor at the bottom of the hole placed in direct contact with a continuous fiberglass rod enclosed in a nylon casing, so that it is free to slide and transmit the relative movement between the anchor and the reference surface head. In the case of multiple strain gauge (multi-base configuration), the anchor points are distributed at different depths along the hole itself. The use of a fiberglass rod (a material with a very low coefficient of thermal expansion) and the minimization of friction between the rod and the ground through the use of a protective nylon sheath ensure high measurement reliability. This type of strain gauge is used in various applications and in particular when extremely precise measurements are required, even those relating to very small variations (of the order of 1/100 mm).