E+H Memosens CUS71E Ultrasonic Sludge Level Sensor

Reliable Ultrasonic Interface Measurement for Wastewater Processes

The Endress+Hauser Memosens CUS71E is a high-performance ultrasonic immersion sensor engineered for continuous sludge blanket level and interface measurement in liquid-solid separation processes. Operating on piezo-electric ultrasonic principles, the CUS71E transmits sound pulses through liquid media and detects echoes reflected from suspended solids and sludge zones. Designed to satisfy the rigorous monitoring demands of industrial facilities and municipal wastewater treatment plants, this sensor ensures optimal control of sludge extraction pumps, prevents solid carryover into clear water channels, and enhances overall process efficiency.

Memosens 2.0 Digital Signal Superiority and Calibration Storing

Equipped with Memosens 2.0 digital sensor technology, the Memosens CUS71E eliminates traditional analog signal interference and cable corrosion risks. Its non-contact inductive coupling guarantees complete galvanic isolation and 100% signal integrity, even in submerged or highly humid tank headspaces. Because sensor calibration data, operating hours, and process diagnostics are recorded directly within the smart sensor head, technicians can perform off-site lab calibrations. Upon connection to Liquiline transmitters (such as CM442 or CM444), the system recognizes the sensor automatically for immediate plug-and-play field deployment.

Automated Anti-Fouling and Low-Maintenance Operation

Biological growth, fat build-up, and air bubble formation on the sensor face are frequent causes of measurement drift in clarification tanks. The CUS71E addresses these challenges with optional automated self-cleaning features. An integrated piezoceramic wiper module continuously cleans the optical acoustic window, preventing bio-film accumulation without requiring frequent manual intervention. This self-cleaning design reduces maintenance downtime, extends service life, and provides consistent, long-term accuracy in challenging primary and secondary settlement tanks.

Seamless Transmitter and Process Control Integration

The Memosens CUS71E connects seamlessly to Endress+Hauser Liquiline multi-channel transmitters to form a cohesive, future-proof liquid monitoring system. Through standard industrial communication protocols—such as HART, PROFIBUS, Modbus, and EtherNet/IP—sludge blanket depth and separation profile data are transmitted directly to the central Distributed Control System (DCS) or Programmable Logic Controller (PLC). This allows plant managers to implement automated sludge pumping schedules based on exact interface levels rather than fixed timers.

 Application

• Wastewater Treatment Plants: Primary clarifiers, secondary settling tanks, final clarification basins, and sludge thickener tanks.

• Industrial Water Treatment: Solids separation in mining effluent, chemical neutralization basins, and pulp & paper process water.

• Utilities & Power Plants: Sedimentation basins, raw water intake clarification, and cooling water treatment facilities.

Technical Parameters

• Measuring Principle: Ultrasonic interface measurement (Piezo-electric transducer)

• Digital Communication Protocol: Memosens / Memosens 2.0 digital technology

• Measuring Range: 0.3 m to 10 m (1 ft to 33 ft)

• Operating Frequency: 657 kHz ultrasonic frequency

• Process Temperature: +0 °C to +50 °C (+32 °F to +122 °F)

• Process Pressure Limit: Up to 6 bar abs (87 psi)

• Sensor Housing Material: ABS / POM / Stainless Steel (depending on model variant)

• Ingress Protection: IP68 (permanently submersible up to 10 m water column)

• Transmitter Compatibility: Endress+Hauser Liquiline CM442, CM444, CM448, CM42 series

FAQ

• Q: What is the primary function of the Memosens CUS71E sensor? A: It measures the interface level between clear liquid and settled sludge blankets in clarification, sedimentation, and thickener tanks using ultrasonic echoes.

• Q: How does the CUS71E handle biological fouling on the sensor face? A: The sensor offers an optional integrated piezo-driven wiper that automatically cleans the acoustic surface, preventing bio-film and bubble build-up.

• Q: Can the CUS71E be connected to third-party controllers directly? A: The CUS71E utilizes Memosens digital protocol and is designed to connect through compatible Liquiline digital transmitters (e.g., CM442 / CM444), which then communicate with DCS/PLC systems via HART, Modbus, or Fieldbus.

• Q: Do you supply original Endress+Hauser units with factory documentation? A: Yes, as an international instrument distributor, we supply 100% original Endress+Hauser Memosens CUS71E sensors complete with original technical documentation and manufacturer certificates.

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