Dry material level switches are used to detect the level of dry materials, especially fly ash, cement, plastics, flour, powders, sand, grain, carbon black, and wood chips, along process lines, or in tanks or vessels. A probe within each dry material level switch is used to read the level of the media, and when a predetermined limit is reached, the switch snaps closed electronically.  This action allows the flow to maintain an appropriate rate by making sure that extra material does not clog the system.  When the media level drops below a second predetermined level, the switch opens, allowing the flow to continue.