Endress+Hauser Prosonic FMU40: Compact Ultrasonic Level Measurement for Liquids and Bulk Solids

For operators who need a cost-effective instrument with straightforward commissioning, FMU40 combines an ultrasonic sensor, transmitter and local display in one compact device. Typical duties include storage tanks, vessels with agitators, stockpiles, conveyor belts and water or wastewater channels.

Why Choose the Prosonic FMU40?

How Ultrasonic Level Measurement Works

The sensor sends ultrasonic pulses toward the product surface and receives the reflected echoes. The transmitter determines the distance from the measured time of flight, then calculates level from the configured empty distance. An integrated temperature sensor automatically compensates for temperature-related changes in the speed of sound.

Prosonic FMU40 Key Specifications

Specifications and approvals depend on the selected order code. Confirm the current manufacturer documentation, medium conditions and installation geometry before ordering.

Typical Applications

• Water, wastewater and utility tanks
• Chemical storage and process vessels
• Liquids, pastes and slurries within the published application limits
• Small silos containing coarse bulk materials
• Stockpiles and conveyor-belt monitoring
• Open channels and weirs for flow measurement

Installation Points That Matter

Mount the sensor so the ultrasonic beam has a clear path to the product surface. Avoid filling streams, ladders, heating coils and other internal structures that can create false echoes. Keep the maximum product level outside the 0.25 m blocking distance. In vessels with agitators or irregular surfaces, use the envelope-curve display and false-echo mapping during commissioning.

Information Needed for Correct Selection

1. Medium name and whether it is a liquid, paste or bulk solid
2. Tank or silo height and required measuring range
3. Process temperature and absolute pressure
4. Foam, vapor, dust, agitation and filling conditions
5. Nozzle size, mounting position and internal obstacles
6. Hazardous-area approval, power supply and signal requirements

Technical reference: Endress+Hauser Prosonic FMU40 official product information. Product specifications and availability may change; confirm the complete order code before purchasing.