Following a screening and grinding process, coal is typically delivered to large storage silos via rail or conveyor belt until it is time to transfer it to loading bins for shipping. The coal silos are large and contain thousands of tons of material. Accurate level measurement systems are required if operators wish to know the real-time inventory of raw coal and have it connected to the ERP systems. In addition, they need to be able to make room for additional coal coming into the silos and get shipments ready.