Weighing / Loss in weight Weighing / Loss in weight It is a device allowing to know the quantity of product extracted from the big bag. This weighing/loss weigh system is possible by the installation of a weighing hoist or weighing scales installed on the frame of the big bag emptying or filling station. The weighing scales are installed under the vibrating hopper of the big bag emptying station. They are placed under the densification table for the weighing of the big bag on a big bag filling station.