Weigh Bridge

A Truck scale, weighbridge or railroad scale is a large set of scales, usually mounted permanently on a concrete foundation that is used to weigh entire rail or road vehicles and their contents. By weighing the vehicle both empty and when loaded, the load carried by the vehicle can be calculated.

The key component that uses a weighbridge in order to make the weigh measurement is load cell.

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Truck scales can be surface mounted with a ramp leading up a short distance and the weighing equipment underneath or they can be pit mounted with the weighing equipment and platform in a pit so that the weighing surface is level with the road. They are typically built from steel or concrete and by nature are extremely robust.

In earlier versions the bridge is installed over a rectangular pit that contains levers that ultimately connect to a balance mechanism. The most complex portion of this type is the arrangement of levers underneath the weighbridge since the response of the scale must be independent of the distribution of the load. Modern devices use multiple load cells that connect to an electronic equipment to totalize the sensor inputs. In either type of semi-permanent scale the weight readings are typically recorded in a nearby office.

Many weighbridges are now linked to a personal computer which runs software capable of printing tickets and providing reporting features.

Truck scales can be used for two main purposes:

  • Selling or charging by weight over the bridge (Trade Approved)

Check weighing both axle weights and gross vehicle weights. This helps to stop axle overloading and possible heavy fines.