Miniature piezoelectric indirect force sensor
30 January 2016
The new measuring pin from Kistler, with its exceptionally small diameter of 8mm and weight of only 34g, is suitable for protecting a wide range of structures from overload damage.
Fitting into an 8mm hole in the structure, the new piezoelectric strain sensor can be easily installed in any position to monitor the forces in a structure to warn of impending failure due to overload conditions. The small size and weight allows retro-fitting to existing installations without introducing measurement error.
Sensitive to transverse forces, the new sensor is a cylindrical pin designed to be mounted in an 8 mm borehole of any depth and orientation to allow the measuring element to be placed precisely at the point where the greatest strain occurs.
The integrated clamping system preloads the sensor in the borehole enabling the measurement of both tensile and compressive forces in the machine structure. The basic range of the sensor is 500 micro-strains (µ?) which may be offset by introducing the following preload forces:
Preload 510N – 0 to 500 µ?
Preload 850N – 140 to 350 µ?
Preload 1190N – -285 to 210 µ?
For continuous monitoring applications, the force measuring pin may be used in combination with the Kistler maXYmos monitoring system to signal when pre-set limit values of force are exceeded to ensure the safety and reliability of both machines and tools. Where needed, the maXYmos system can provide a signal to automatically shut down an operation when tool failure is likely.
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