Turbimax CUS51D is an in-situ turbidity and suspended solids sensor for continuous measurement directly in the process, using dual independent scattered-light sensor units for stable readings. Size: 40 mm sensor diameter, in-situ (immersion/retractable) or extractive flow-cell installation Application: Turbidity and suspended solids monitoring at all stages of wastewater treatment and primary water treatment Measuring Principle: Scattered light (90°/135°) with 4-beam cross light, 2 independent parallel sensor units Measuring Range: 0 to 4000 FNU (formazin), 0 to 300 g/L (sludge) Installation: In-situ immersion, retractable holder, or extractive sample/flow cell Key Features: Dual sensor units for stable, self-verifying measurement No sampling required (in-situ operation) Suitable for medium to high turbidity applications