What Is the Turbimax CUS71D?
The Turbimax CUS71D, by Endress+Hauser, is an ultrasonic interface sensor specifically developed for immersion and interface measurement in applications like wastewater treatment and water purification processes
Applications
Ideal uses include:
- Wastewater Treatment: Monitoring in primary clarifiers, sludge thickeners, and secondary clarifiers
- Water Purification: Settling basins post-flocculant dosing, sludge height monitoring in contact sludge process, filter media expansion/backwash timing
- Chemical & Industrial Separation: Static separation, process water recycling, product phase separation, flotation monitoring
Key Benefits
- Reliable & Continuous: Delivers accurate, real-time interface measurement for efficient control of valves and actuators
- Safe & Intelligent: Stores calibration and sensor data internally (Memosens technology), enabling easy swap-out and predictive maintenance
- Maintenance-Minimized: Optional wiper prevents film buildup; automatic cleaning supports long-term, maintenance-free operation
- Flexible Installation: Compatible mounting hardware for various clarifier and basin designs
- Simplified Commissioning: Comes with predefined calculation models, reducing setup complexity
Measuring Principle & Sensor Monitoring
- Technology: A piezoelectric crystal in a cylindrical plastic housing emits sonar at ~650–657 kHz and a 6° angle, scanning the separation zones. It measures the echo return time to calculate interface depth
- Signal Processing: Coupled with a Liquiline CM44x transmitter, it masks irrelevant zones, selects signal edges, amplifies for floating sludge, and tracks a "gate" region dynamically to capture the separation layer precisely
- Diagnostics: Continuously monitors acoustic signals for plausibility; errors like implausible readings or control disturbances are flagged via the transmitter’s diagnostics
Technical & Installation Specifications
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Feature
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Details
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Measuring Range
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0.3 to 10 m (1 to 32 ft)
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Operating Temp
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1 °C to 50 °C (34 °F to 122 °F)
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Operating Pressure
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0 to 6 bar (standard); wiper version: up to 0.3 bar
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Materials
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ABS & epoxy resin sensor body; EPDM wiper; polyamide housing
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Protection
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Rated IP68—fully submersible and rugged
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Installation Tips
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Minimum 50 cm clearance from basin rim; no obstructions within measurement cone; install ≥20 cm below water surface; up to 100 m cable with accessories like CYK11 cable, junction boxes
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System Components
A fully functional measuring system typically includes:
- Turbimax CUS71D ultrasonic sensor
- Liquiline CM44x multi-channel transmitter
- Optional Accessories:
- Weather protection cover (CYY101)
- Holder assemblies (Flexdip CYH112 or CYA112)
- Dip pipes or splash protection caps
- PVC protectors for surface skimmer zones
Summary
The Turbimax CUS71D is a smart, maintenance-optimized, and reliable ultrasonic sensor tailored for demanding interface measurement in water and wastewater treatment. With Memosens digital storage, optional wiper, and flexible mounting, it's built for long-term deployment with minimal upkeep.
