Tuesday, June 19, 2007

Using SGs in load cells

One important direct application of SGs is for the measurement of force or weight. These transducer devices, called load cells, measure deformations produced by the force or weight. In general, a beam or yoke assembly is used that has several strain gauges mounted so that the application of a force causes a strain in the assembly that is measured by the gauges. A common application uses one of these devices in support of a hopper or feed of dry or liquid materials. A measure of the weight through a load cell yields a measure of the quantity of material in the hopper. Generally, these devices are calibrated so that the force (weight) is directly related to the resistance change. Forces as high as 5 MN (approximately 106 Ib) can be measured with an appropriate load cell.

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