Cerlic sludge blanket and TSS sensors

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Unlike turbidity meters designed to measure the reflection of light off particles in clean water, Cerlic’s range of suspended solids sensors has been developed with industry using near infrared (NIR) transmission of light to actually see suspended solids (>40 μm) in wastewater. With this operating principle, they measure TSS concentration (mg/L or ppm) without the need for colour compensation.

The CBX sludge blanket meter provides repeatable and accurate continuous measurement of both sludge blanket and fluff depths in clarifiers and thickeners. Like a yo-yo, the sensor is automatically lowered while the built-in pressure transducer (range up to 10 m) accurately records the depth of the user’s predefined fluff and sludge concentrations. The BB1 controller provides 4-20 mA output for both sludge and fluff levels, along with optional full sludge profile or digital communication via Profibus DP.

A switch input warns of the rake/scrapper position to ensure the sensor is retracted out of the way in time. While it returns, both the cable and NIR sensor are automatically flushed with jets of water (or air) to minimise manual maintenance. Since Cerlic sensors actually measure suspended solids concentration, they can be zero referenced on-site in regular, de-aerated tap water.