Every meat processing/packing plant weighs and moves carcasses of the animals they are processing on rails.
Now, think about weighing each and every animal that comes through your plant. In order to get accurate weights for each animal, what is the one thing you need to know?
You need to know the weight of the trolley that the animal is hanging on. You could weigh a few trolleys and use the average weight of those as the tare weight for all trolleys, but without the weight of each trolley, any carcass weight is only an estimation of what that animal actually weighs.
So you might wonder, how can you get the weight of every trolley and how can you use those weights to know accurately the weight of each animal? The solution to this problem is an in-motion trolley scale.
After hours/days/years of use (and abuse), the weight of each trolley will change. Even new trolleys might not weigh exactly the same. In order to accurately weigh the carcasses, the weight of each trolley must be known and trolleys that become too heavy or too light should be removed from the rotation.
A good in-motion trolley scale will weigh each trolley and, based on settable upper and lower weight limits, drop the trolley off the rail so it can either be fixed or thrown away.
In order to keep track of and use each individual trolley weight, a trolley tracking system such as Vande Berg Scales patented Trolley Vision® system can be used with the in-motion trolley scale to be able to subtract the tare weight of each specific trolley from each carcass weight to get accurate carcass weights.