This detector monitors solid-liquid interface levels in clarifiers and sedimentation basins (including lamellas and decanting tanks) and automates silt/sludge removal. It allows users to program de-sludge pumps to operate only when necessary, preventing overflows and optimizing feed density. In DAF units, it also adjusts skimmer speeds to match variations in the sludge layer. Slim profile and use of LEDs are ideal for obstructed/constricted areas. No calibration required.