Features
• LED beam automatically adjusts its intensity to detect settled sludge blanket and supernatant interface levels in thick or thin sludges, or in light flocs
• Sludge level interface detection is not distorted by the inclined plates of lamella separators
• Advanced self-diagnostics
• High intensity infrared beams
• Automatic beam intensity control
• 4 – 20 ma output linear with sludge interface level depth
• High & low sludge blanket depth set-point relays

Applications
• Clarifiers and thickeners. 
• Gravity settlers and decanting tanks. 
• Dissolved Air Flotation (DAF) units.
• Sequential Batch Reactors (SBRs).
• Sumps, pits, and inclined plate clarifiers.
• Municipal water and wastewater treatment. 
• Industrial process plants (food, pulp & paper, chemical, and power generation).

How It Works

The Model 602 uses an optical probe to detect light reflected from suspended solids in the liquid.
When the sensor reaches the sludge blanket, the reflected light intensity changes. The system interprets this variation to determine the sludge level and automatically triggers outputs for control or alarm functions.

The controller continuously compensates for variations in solids concentration, maintaining accuracy in real-world operating conditions.