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Load cell

Load cells are known in the art and used to convert sensed mechanical forces into electrical signals. Load cells provide accurate measurements of compressive or tensile forces. Load cells commonly function by utilizing an internal strain gauge that measures deflection or sheer. Because the modulus of elasticity of a load cell is constant the amount of strain can be calibrated to determine the force upon the cell. Typically, the force creates a strain in the load cell which is measured by strain gage transducers. A typical load cell includes one or more force transducer, such as strain gages, which are configured as an electrical bridge circuit. The strain gages are used to determine a load by serving as resistors in a Wheatstone bridge. The changes in resistance in the strain gages which results from a load being applied to the sensing beam of the load cell are measured to determine the load. A load cell also includes a counterforce or force receiver which is configured and disposed to support a load and to deflect in response thereto. A force transducer is mounted on the counterforce and used to generate analog electrical signals that are proportional to the load supported by the counterforce. In a typical load cell, four strain gauges are attached to the surface of the counterforce and are electrically connected in a full wheatstone bridge configuration. The analog electrical output of the wheatstone bridge is the output signal of the load cell. Load cell weighing systems use a plurality of load cell assemblies to monitor the weight added to the trucks and trailers. Load cells have different shapes for different applications and load requirements to ensure that the desired component of force is measured, thus strain gauges having different shapes are positioned in various orientations upon the load cell body.

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