Weigh cells or load cells are typically used to measure the mass of the contents of a vessel. These are electromechanical devices which convert force or weight into an electrical signal. The technique is to construct a wheatstone bridge similar to that used in the RTD circuit with one resistor being a rheostat which changes resistance based on load.
Three configurations are popular. These are the column, where the cell is interposed between one leg of the vessel and the ground (see Fig. 9) and is typically used for weights exceeding 5000 pounds. The second is the cantilever design, where the weight is applied to a bending bar and is used for weights under 500 pounds. The third is the shear design, where the weight is applied to the center of a dual strain gage arrangement.
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