Endress+Hauser Prosonic FMU90-R12CA131AA3A

 Ultrasonic Level Transmitter

Endress+Hauser Prosonic FMU90-R12CA131AA3A | Ultrasonic Level Transmitter | 45m

The Endress+Hauser Prosonic FMU90-R12CA131AA3A is a versatile, non-contact ultrasonic level transmitter designed for continuous level measurement of liquids, sludge, pastes, and bulk solids, as well as flow measurement in open channels and weirs . This field housing version supports connection of up to 2 FDU9x series ultrasonic sensors and offers integrated pump control, rake control, and limit detection functions .

The Prosonic FMU90 series is part of Endress+Hauser's Xpert selection – specialized products designed for demanding applications requiring advanced functionality and flexibility .

Order Code Breakdown: FMU90-R12CA131AA3A

Based on Endress+Hauser's ordering structure for the Prosonic FMU90 series :

Key Features & Benefits

• High Measurement Accuracy: Delivers ±2 mm + 0.17% of measured distance, ensuring reliable process control 

• Flexible I/O Configuration: Equipped with 3 SPDT relays and 1x 4-20 mA HART output; optional second analog output available 

• Integrated Control Functions: Supports pump control, rake control, limit detection, flow monitoring, and up to 6 relays for alarms (optional) 

• Automatic Sensor Recognition: Auto-detects FDU9x series ultrasonic sensors for plug-and-play operation 

• User-Friendly Interface: 6-line backlit graphic display with envelope curve display for on-site diagnostics; 15 languages available 

• Built-in Flow Curves: Pre-programmed linearization for common flumes and weirs; 32-point custom linearization 

• Remote Diagnostics: Compatible with FieldCare PC software for remote operation, diagnostics, and documentation 

Technical Specifications

Applications

• Water & Wastewater Treatment: Level monitoring in storage tanks, pump stations, lift stations, and clarifiers 

• Open Channel Flow Measurement: Flow monitoring in weirs and flumes with pre-programmed flow curves 

• Stormwater Overflow Basins: Simultaneous level and flow measurement with a single sensor 

• Bulk Solids: Level monitoring of powdery to coarse bulk materials in silos and hoppers 

• Pump Control: Alternating pump control, dry-run protection, and rake control functions 

• Industrial Processes: Level and flow monitoring in chemical, food, and mining industries

Prosonic FMU90-R12CA131AA3A

• Xpert Selection: Specialized product designed for demanding applications requiring advanced functionality 

• Field-Proven Reliability: IP66/NEMA 4x housing with corrosion-resistant materials ensures durability in harsh environments

• Built-in Intelligence: Integrated pump control, flow calculation, and limit detection reduce external control hardware

• Easy Commissioning: Automatic sensor recognition and intuitive menu guidance with 6-line display 

• Global Support: Backed by Endress+Hauser's worldwide service network

• Comprehensive Diagnostics: On-site envelope curve display enables quick troubleshooting 

Q&A

Q1: What is the maximum measurement range of the FMU90-R12CA131AA3A?

A: The maximum measurement range depends on the connected FDU9x sensor. With compatible sensors, the Prosonic FMU90 can measure up to 45 meters (148 feet) for liquids and bulk solids . The device automatically recognizes FDU90/91/92/93/95 sensors, each with different range capabilities optimized for specific applications .

Q2: What control functions are integrated into this transmitter?

A: The FMU90 includes built-in pump control functions (alternating pumps, dry-run protection), rake control, limit detection, and flow monitoring . The R12CA131AA3A configuration includes 3 SPDT relays, with the option to expand up to 6 relays for additional alarm or control functions . Pre-programmed flow curves for standard weirs and flumes enable direct flow measurement without external calculation units .

Q3: How accurate is the Prosonic FMU90 for level measurement?

A: The Prosonic FMU90 delivers a reference accuracy of ±2 mm + 0.17% of the measured distance . For example, at a 10 m measurement distance, the accuracy would be approximately ±2 mm + 17 mm = ±19 mm (0.75 inches). The device includes integrated temperature compensation to automatically correct for sound velocity variations caused by temperature changes, ensuring consistent accuracy across different operating conditions 


Endress+Hauser Prosonic FMU90-R12CA131AA3A ultrasonic level transmitter. 4-20mA HART, IP66, ±2mm accuracy, up to 45m range, pump control, for water/wastewater.