Endress+Hauser Prosonic FMU41: Extended-Range Ultrasonic Level Measurement up to 8 Meters

FMU41 can be used in storage tanks, vessels with agitators, stockpiles and conveyor-belt applications. It is also suitable for flow measurement in open channels and at weirs. The two-wire or four-wire compact design integrates the sensor and transmitter in one instrument.

Why Choose the Prosonic FMU41?

How Ultrasonic Measurement Works

The sensor sends ultrasonic pulses toward the material surface and receives the returning echoes. The transmitter uses the measured time of flight to determine distance and calculate level. An integrated temperature sensor automatically compensates for temperature-related changes in the speed of sound.

Prosonic FMU41 Key Specifications

Specifications, output variants and approvals depend on the selected order code. Confirm the current manufacturer documentation and complete application conditions before ordering.

Typical Applications

• Water and wastewater tanks
• Chemical storage and process vessels
• Liquids, pastes and slurries within the published limits
• Small to medium silos with coarse bulk material
• Stockpiles and conveyor-belt monitoring
• Open-channel and weir flow measurement

FMU40 or FMU41?

Installation and Selection Notes

Provide a clear acoustic path between the sensor and product surface. Keep the filling stream, ladders, heating coils and structural members outside the ultrasonic beam. The maximum level must remain outside the 0.35 m blocking distance. Heavy foam, dense vapor, strong turbulence, vacuum and severe temperature gradients can weaken the echo and should be reviewed during selection.

Information Needed for Correct Selection

1. Medium name and whether it is 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 FMU41 official product information. Product specifications and availability may change; confirm the complete order code before purchasing.