Conceptual design of multi-capacity load cell

Abstract

Abstract. Force measuring systems (transducers and indicators) are usually used to calibrate force generated systems.Normally, it is not recommended to use load cells to measure forces less than 10% of its nominal capacity, thus, to offer calibration facilities for different ranges, several load cells are required, which may lead to difficulties in handling procedures in addition to the main disadvantage which is the over cost.This article illustrates conceptual design for a new introduced multi-capacity load cell showing the design parameters and the required metrological characteristic of the new load cell. Force measurement systemsA force measurement system is made up of a transducer and associated instrumentation. The transducer is subjected to the force to be measured, and the resulting change in the element is measured by the associated instrumentation. Force transducers can be distinguished accorduing to the type of output signal generated (mechanical, hydraulic, pneumatic or electrical). Mechanical Force Transducers.The most famous mechanical force transducer is the proving ring, where the deformation of the elastic element is measured via mechanical device. These transducers have the advantage of being simple and robust. The main disadvantage is the strong effect of temperature on the output. Piezoelectric Crystal load cells.These types differ from most other sensing elements in that they are active sensors. No power supply is needed and the deformation to generate a signal is very small. It had the advantage of a high frequency response of the measuring system without introducing geometric changes to the force measuring path. When a force is exerted on certain crystalline materials, electric charges are formed on the crystal surface in proportion to the rate of change of that force.