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

System Components

A fully functional measuring system typically includes:

1. Turbimax CUS71D ultrasonic sensor
2. Liquiline CM44x multi-channel transmitter
3. 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.