Bulk haulage operators constantly run the risk of prosecution for vehicle overloading (or poor load distribution)

The easiest method of prevention is to run under-loaded, but this can mean a significant loss of income. Onboard weighing systems remove the risk of overload fines and ensure operators always run their vehicle at optimum payload.

Safety

Poor load distribution can cause vehicles to tip over during normal driving conditions. This can also occur when vehicles are tipping their load, especially while on unlevel or unstable ground. Systems which use a combination of onboard weighing systems and inclinometers can give advanced warning of an unstable situation.

Typical System

A typical vehicle onboard weighing system comprises load cells fitted between the body and chassis to measure the payload of the body, when it is raised slightly off the chassis.

The installation generally comprise four load cells- two mounted under the tipping gear and one under each rear hinge.

In certain circumstances the front load cells are replaced by one or more pressure transducers fitted in the hydraulic ram.

Weight indicators can be mounted both in the cab and externally to display teetotal payload. Software is also available that will compute and display the individual axle/bogie weights using information received from the load cells combined with data on the vehicle itself.

In addition to basic displays, audible alarms can be provided and preset to warn of various loading conditions.

There are three main levels of system available:

BASIC

Payload weight information only.

INTERMEDIATE

Payload weight

Front and rear load distribution.

ADVANCED

Payload weight

Tare weight

Gross vehicle weight

Individual axle weights

Split load/delivery facility.