The Binswitch sensor detects level or plug situations for bulk granular solids or liquids in tanks, bins, or silos and can be used as a plug or choke detector in chutes, conveyors and elevator legs. Programmable features include time delay on material arriving or leaving, and failsafe relay settings for high and low levels. A two color LED shows material present or absent and flashes red or green to show the time delay is operating. The programmable sensor operates on 12-240 VAC/DC and gives a changeover relay contact output. The polycarbonate housing is corrosion and abrasion resistant, dust-tight, and waterproof.