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Low creep and hysteresis load cell based on a force to liquid pressure transformation

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Nationale sensor conferentie maart 1998.PDF 1 LOW CREEP AND HYSTERESIS LOAD CELL BASED ON A FORCE TO LIQUID PRESSURE TRANSFORMATION Robert A.F. Zwijze, Remco J. Wiegerink, Theo S. J. Lammerink and Miko Elwenspoek Mesa Research Institute, University of Twente P.O. Box 217, 7500 AE Enschede, The Netherlands Keywords: load cell, force measurement, creep, hysteresis 0. Abstract Important problems in load cells are creep and hysteresis. Expensive high grade steels are used in order to reduce these effects. In this paper a load cell design based on a force to liquid pressure transformation is presented. The design is insensitive to hysteresis and creep and can be made at very low costs. Analytical, numerical and experimental results are in very close agreement with each other. 1. Introduction A load cell is a sensor for the measurement of forces and masses. Load cells are for example used in weighing bridges for lorries, cars and trailers. Also in industries where bulk material is worked up, it is necessary to measure masses as accurate as possible. Most current load cells are made of steel. The performance of these load cells is limited by hysteresis and creep even when expensive high grade steels are used. Hysteresis means that the output is a function of the loading history. Creep means that for a fixed load the output changes in time. In order to increase stability and to decrease the costs, a new type of load cell is presented which is nearly free of hysteresis and creep and which has a very simple design. The load cell we are aiming at has the following specifications: · maximum load: 10000 N (1000 kg) · accuracy of full scale: 0.03 % = 0.3 kg · temperature range: -10 up to 50 °C · production costs: less than US $ 75 · calibration: once in two years The load cell discussed in this paper transforms the force into a fluid pressure. This pressure is measured by a commercial silicon pressure (pressure range: 0-8.8 bar; price: US $ 25) sensor which is because of its mono

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