The amounts from each gauge are added together to get the total for that axle. The strain gauge on each plate measures the amount of stress and calculates the load required to cause it. As weight is applied to the scale, the plates are subjected to stress. A compression strain gauge is based on how much the cell compresses when pressure is applied, while a tension strain gauge is based on the slight change in shape of the cell caused by the weight.Ī bending-plate system uses metal plates with strain gauges attached to them. The strain gauges in load cells can be either compression or tension based. The signal from each cell is sent to a junction box, where sensors measure the variance in the current and calculate the amount of weight the scale is supporting. The change in the wire results in a difference in the resistance to the current passing through it. As the cell is subjected to weight, the wire in the strain gauge is altered or compressed slightly. A strain gauge consists of a wire (or wires) that transmits a mild electric current. Each cell is comprised of a durable material such as steel or concrete with one or more strain gauges attached to or embedded in it. Load-cell systems are the most popular technology used. Let's take a look at some of the more common forms. The technology used in the scales themselves varies. For example, Weigh-Tronix provides a truck scale that they warranty to weigh trucks with a gross weight of 80,000 lbs (36,000 kg) each at a rate of 200 per day, 365 days a year for 25 years! Truck scales are built out of steel, concrete or, in most cases, a combination of both. Truck scales are built to handle an enormous amount of abuse.
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