Endress+Hauser CUS71D-AA2A Ultrasonic Level Sensor Reliable Non-Contact Measurement

The Endress+Hauser CUS71D-AA2A is a robust, two-wire, 26 GHz radar level transmitter designed for continuous, non-contact measurement in liquids, slurries, and bulk solids. Part of the versatile Micropilot FMR50 series, this device is engineered for reliability in challenging industrial environments such as chemical processing, water/wastewater, food and beverage, and power generation. Its compact design and high-frequency radar technology make it ideal for applications in small tanks, vessels with internal obstructions, and processes with aggressive media or variable conditions.

Technical Specifications

Model: CUS71D-AA2A (Specific configuration: Plastic antenna, 2" NPT process connection, 4-20 mA HART output)

Measuring Principle: 26 GHz Frequency Modulated Continuous Wave (FMCW) radar

Measuring Range: Up to 20 m (66 ft)

Process Connection: 2" NPT (other thread/flange options available in series)

Antenna Type: Plastic (PP), focused design for narrow beam angle

Accuracy: ± 2 mm (0.08 in) typically

Process Temperature: -40 to 130 °C (-40 to 266 °F)

Process Pressure: Up to 3 bar (43.5 psi)

Output Signal: Two-wire 4-20 mA with HART protocol

Power Supply: Standard 12 to 30 V DC (loop-powered)

Housing: Aluminum, powder-coated, IP66/IP67 protection

Approvals: CE, FM, ATEX, IECEx for hazardous area use (depends on specific certification suffix)

Key Features & Advantages

High-Frequency, Focused Radar Performance

Operating at 26 GHz, the CUS71D-AA2A provides a very narrow beam angle, allowing for installation in confined spaces, near tank walls, or on nozzles without interference. This minimizes false echoes from internal structures.

Exceptional Reliability in Difficult Conditions

The non-contact measurement is unaffected by changing media properties (density, conductivity, dielectric constant), viscosity, steam, dust, or pressure variations. It performs consistently where other technologies fail.

Simple Commissioning and Operation

Featuring intuitive setup via the integrated display with pushbuttons or using the HART communicator/Field Xpert tool. Advanced diagnostics like echo curve display aid in troubleshooting and optimization.

Robust and Versatile Design

The corrosion-resistant plastic antenna and rugged housing ensure long service life in aggressive environments. Its compact form factor is suitable for a wide range of tank sizes and applications.

Safety and Certification

Designed for industrial safety, available versions carry international approvals for use in hazardous areas (Zone 0/1), ensuring compliance in critical installations.

Why Choose the Endress+Hauser CUS71D-AA2A?

This radar level transmitter sets the standard for cost-effective, maintenance-free continuous level measurement. It solves common application challenges like condensation, buildup, or aggressive chemicals that plague other sensor types. By delivering precise, reliable data, it enhances process control, inventory management, and safety, maximizing operational efficiency.

For specific application suitability, configuration options (e.g., different antenna materials, process connections, or safety certifications), or detailed datasheets, please consult our technical team.

Keywords: Endress+Hauser CUS71D-AA2A, Micropilot FMR50, radar level transmitter, non-contact level sensor, 26 GHz radar, continuous level measurement, tank level sensor, HART level transmitter, FMCW radar, inventory control, process automation, hazardous area level sensor, liquid level measurement.