Endress+Hauser FDU91-RG1AA Ultrasonic Sensor FDU91RG1AA

• Extended Product Type: Sensor

• Product ID: FDU91-RG1AA

• E+H Type Designation: Sensor

Description of Endress+Hauser FDU91-RG1AA Ultrasonic Sensor

The Endress+Hauser FDU91-RG1AA Ultrasonic Sensor is a high-performance, non-contact level measurement solution designed for demanding industrial environments. Engineered for accuracy, durability, and flexibility, this ultrasonic sensor is ideal for continuous level monitoring of liquids, slurries, and bulk solids across a wide range of applications.

Built with robust materials and advanced signal processing technology, the FDU90 ensures reliable measurements even in harsh conditions such as dust, vapor, temperature fluctuations, and corrosive atmospheres. Its non-contact design eliminates mechanical wear, reducing maintenance costs and extending service life.

The FDU91-RG1AA is fully compatible with Endress+Hauser transmitters such as the Prosonic series, enabling seamless integration into automation systems. It provides precise distance measurement by emitting ultrasonic pulses and calculating the time of flight, ensuring high accuracy in tanks, silos, and open channels.

This sensor is particularly well-suited for industries such as water and wastewater treatment, chemical processing, mining, and food & beverage, where reliable level measurement is critical for operational efficiency and safety.

Key Features of Endress+Hauser FDU91-RG1AA Ultrasonic Sensor 

• Non-contact ultrasonic measurement technology
• High accuracy and long measuring range
• Resistant to dust, vapors, and chemical exposure
• Maintenance-free operation (no moving parts)
• Suitable for hazardous and harsh industrial environments
• Compatible with Endress+Hauser Prosonic transmitters
• Integrated temperature compensation for improved accuracy
• Robust housing for long-term durability

Technical Specifications of Endress+Hauser FDU91-RG1AA Ultrasonic Sensor 

Parameter	Specification
Product Model	FDU91-RG1AA
Measurement Principle	Ultrasonic (non-contact)
Measuring Range	Up to 10 m (33 ft) (liquids & bulk solids)
Accuracy	±0.2% of measured distance
Operating Temperature	-40°C to +80°C (-40°F to +176°F)
Process Pressure	Atmospheric
Beam Angle	Approx. 8°
Output Signal	Via compatible transmitter (e.g., Prosonic series)
Material	PVDF / chemically resistant materials
Protection Rating	IP68 (submersible and dust-tight)
Mounting Options	Threaded or flange mounting
Hazardous Area Approval	Available (ATEX, IECEx depending on configuration)
Frequency	Approx. 70 kHz
Cable Length	Configurable

Applications of Endress+Hauser FDU91-RG1AA Ultrasonic Sensor 

The Endress+Hauser FDU90 ultrasonic sensor is widely used across industries that require reliable, non-contact level measurement:

Water & Wastewater Treatment

• Monitoring tank levels in treatment plants
• Sludge level measurement
• Open channel flow measurement

Chemical & Process Industries

• Corrosive liquid level monitoring
• Storage tank inventory management
• Reactor and mixing vessel measurement

Mining & Bulk Solids

• Level measurement in silos and hoppers
• Ore and aggregate monitoring
• Dust-heavy environments

Food & Beverage

• Hygienic level monitoring of liquids
• Storage tank measurement
• Process optimization

Industrial Automation

• Integration with PLCs and SCADA systems
• Remote monitoring and control systems

Advantages of Endress+Hauser FDU91-RG1AA Ultrasonic Sensor

The FDU91-RG1AA ultrasonic level sensor stands out for its combination of precision, rugged construction, and adaptability. Its ability to perform reliably in challenging environments makes it a preferred choice for engineers and plant operators seeking dependable level measurement solutions.

With increasing demand for non-contact level sensors, ultrasonic level transmitters, and industrial tank monitoring systems, the Endress+Hauser FDU90 delivers a future-proof solution that enhances operational efficiency while minimizing downtime.

Frequently Asked Questions (FAQ)

1. What is the measuring principle of the FDU91-RG1AA?

The sensor uses ultrasonic waves to measure distance by calculating the time it takes for sound pulses to travel to the surface and return.

2. Can the FDU90 be used in harsh environments?

Yes, it is designed to operate in environments with dust, vapors, and chemical exposure, thanks to its robust construction and IP68 protection.

3. Is this sensor suitable for solid materials?

Yes, it can measure both liquids and bulk solids such as powders and granules.

4. Does the sensor require direct contact with the medium?

No, it is a non-contact sensor, which reduces wear and maintenance requirements.

5. What systems is the FDU90 compatible with?

It is compatible with Endress+Hauser transmitters, especially the Prosonic series, and can integrate into PLC and SCADA systems.

6. How accurate is the FDU90 ultrasonic sensor?

It provides high accuracy, typically around ±0.2% of the measured distance under optimal conditions.

7. What industries commonly use this sensor?

Industries include water treatment, chemical processing, mining, food & beverage, and general industrial automation.