A grain facility has a grain receiving station and a grain transport line with a grain elevator, a distributor with at least one input spout, and at least one grain bin. The grain transport line moves grain from the grain receiving station to one of the at least one grain bins and the distributor directs the grain to a selected bin of the at least one grain bin. The grain facility further includes an optical sensing system having at least one optical sensor positioned in the grain transport line at or before the distributor, wherein the optical sensing system senses the type of grain in the grain transport line. A control system determines if the grain passing through the grain transport line is suitable for the selected grain bin and produces an alarm if the grain in the grain transport line is not suitable for the selected grain bin.