If you’re experiencing inaccurate readings from your weighbridge, this article will help you identify some of the possible causes.
What is a weighbridge?
Weighbridges are used to measure heavy vehicle loads, and they are common in waste management facilities, quarries, delivery centres plus many more. The weighbridge is a solid platform featuring one or more load cells, a junction box and a weight controller.
When the weight of a vehicle is distributed through the load cells, an electronic signal is sent to the junction box where it is converted into a weight reading. Most commonly, weighbridges are used to check the load weight of trucks going in and out of a facility, and as such, they are a vital part of supply chain logistics. Plus, it’s also beneficial for ensuring vehicles do not exceed their maximum loads.
However, like any piece of equipment, things can always go wrong. Let’s take a look at some common weighbridge issues.
Load cell problems
The load cell is a metal part that bends under the weight of the vehicle when it drives onto the weighbridge. It then sends an electrical signal that is converted into a weight reading. If these load cells are damaged, the readings will naturally be inaccurate. Many weighbridges have more than one load cell, meaning there is a greater risk of one suffering from damage.
In addition, issues can be caused if the load cells aren’t of sufficient quality to begin with. Load cells need to settle in less time than it takes to get a weight reading. As such, regular calibration of weighbridges and maintenance are required to ensure load cells are all working correctly.
Improper loading
For a weighbridge to work correctly, all loads need to be placed on each load cell according to the manufacturer’s instructions. If this isn’t done right, it can result in inaccurate readings. The structure beneath the load cells also needs to be strong enough to support the load without bending.
Most weighbridges are built for purpose, meaning load cells should already be aligned to handle the typical types of vehicles and weights using the facility. However, vehicles still need to be loaded correctly for the system to work properly.
Weight controller problems
The weight controller is essentially the part of your weighbridge that delivers the weight reading. In some cases, if the weight controller is reading something other than the load, it can produce false readings.
Common issues here include electrical interference from power lines, two-way radios and even lightning. Moisture in the junction box can also present a problem as it can affect the cables for each load cell. When weighbridges are installed correctly, you shouldn’t have these issues, but it’s something to keep an eye on.
Climate and environment
Like any electrical equipment, a weighbridge’s function can be compromised by poor weather. Naturally, rain and moisture can affect the electrical components of your load cells. However, the wind is another one to be wary of, as it can compromise your weight readings if the vehicle being weighed sways too much. Even vibrations from nearby equipment can affect your weighbridge, so try to keep it as isolated as possible and always load the weighbridge carefully.
If you need assistance with weighbridge installation, calibration, servicing or repairs, don’t hesitate to contact NWI Group today.
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