Ultrasonic level measurement

Simple products
Easy to select, install and operate

Technical excellence

Simplicity

What is FLEX?

Standard products
Reliable, robust and low-maintenance

Technical excellence

Simplicity

What is FLEX?

High-end products
Highly functional and convenient

Technical excellence

Simplicity

What is FLEX?

Specialized products
Designed for demanding applications

Technical excellence

Simplicity

Variable

What is FLEX?

FLEX selections	Technical excellence	Simplicity
F L E X Fundamental selection Meet your basic measurement needs	Technical excellence	Simplicity
F L E X Lean selection Handle your core processes easily	Technical excellence	Simplicity
F L E X Extended selection Optimize your processes with innovative technologies	Technical excellence	Simplicity
F L E X Xpert selection Master your most challenging applications	Technical excellence	Simplicity Variable

Learn more about the FLEX selections

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Ultrasonic measurement Time-of-Flight Prosonic FDU90

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 3m)

Accuracy +/- 2mm + 0.17% of measured distance

Process temperature -40 °C ... 80 °C
(-40 °F ... 176 °F)

Process pressure / max. overpressure limit 0.7 bar ... 4 bar abs
(10 psi ... 58 psi)

Max. measurement distance Liquids: 3 m (9.8 ft),
Solids: 1.2 m (3.9 ft)

Main wetted parts PVDF (IP68 / NEMA6P)

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Ultrasonic measurement Time-of-Flight Prosonic FDU91

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 10m)

Accuracy +/- 2 mm + 0.17% of measured distance

Process temperature -40 °C ... 80 °C
(-40 °F ... 176 °F)

Process pressure / max. overpressure limit 0.7 bar ... 4 bar abs
(10 psi ... 58 psi)

Max. measurement distance Liquids: 10 m (33 ft),
Solids: 5 m (16 ft)

Main wetted parts PVDF (fully welded IP68 / NEMA6P)

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Ultrasonic measurement Time-of-Flight Prosonic FDU91F

Hygienic sensor for level and flow measurement for connection to FMU9x (measuring range up to 10m)

Accuracy +/- 2 mm + 0.17% of measured distance

Process temperature -40 °C ... 105 °C
(-40 °F ... 221 °F)
CIP: 30 min: 135 °C
(30 min: 275 °F)

Process pressure / max. overpressure limit 0.7 bar ... 4 bar abs
(10 psi ... 58 psi)

Max. measurement distance Liquids: 10 m (33 ft),
Solids: 5 m (16 ft)

Main wetted parts 316L (fully welded IP68 / NEMA 6P)

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Ultrasonic measurement Time-of-Flight Prosonic FDU92

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 20m)

Accuracy +/- 2mm + 0.17% of measured distance

Process temperature -40 °C ... 95 °C
(-40 °F ... 203 °F)

Process pressure / max. overpressure limit 0.7 bar ... 4 bar abs
(10 psi ... 58 psi)

Max. measurement distance Liquids: 20 m (65 ft),
Solids: 10 m (33 ft)

Main wetted parts PVDF (fully welded IP68 / NEMA 6P)

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Ultrasonic measurement Time-of-Flight Prosonic FDU93

Ultrasonic sensor for level and flow measurement for connection to FMU9x (measuring range up to 25m)

Accuracy +/- 2mm + 0.17% of measured distance

Process temperature -40 °C ... 95 °C
(-40 °F ... 203 °F)

Process pressure / max. overpressure limit 0.7 bar ... 3 bar abs
(10 psi ... 43 psi)

Max. measurement distance Liquids: 25 m (85 ft),
Solids: 15 m (50 ft)

Main wetted parts UP (unsaturated polyester)

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Ultrasonic measurement Time-of-Flight Prosonic FDU95

Ultrasonic sensor for level measurement for connection to FMU9x (measuring range up to 45m)

Accuracy +/- 2mm + 0.17% of measured distance

Process temperature -40 °C ... 80 °C
or 150 °C
(-40 °F ... 176 °F
or 302 °F)

Process pressure / max. overpressure limit 0.7 bar...1.5 bar abs
(10 psi...22 psi)

Max. measurement distance 45 m (148 ft)

Main wetted parts UP (unsaturated polyester)

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Ultrasonic measurement Time-of-Flight Prosonic FMU30

Cost effective all-round instrument for level applications in liquids and bulk solids

Accuracy +/- 3 mm or +/- 0.2 % of set measuring range

Process temperature -20 °C ... 60 °C
(-4 °F ... 140 °F)

Process pressure / max. overpressure limit 0.7 bar ... 3 bar abs
(10 psi ... 44 psi)

Max. measurement distance Sensor 1-1/2": 2 m (6.6 ft)
Sensor 2": 3.5 m (11 ft)

Main wetted parts PP/EPDM

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Ultrasonic measurement Time-of-Flight Prosonic FMU40

Cost effective device for sophisticated level measurement in liquids and bulk solids for up to 5m

Accuracy +/- 2 mm or +/- 0.2 % of set measuring range 1)

Process temperature -40 °C ... 80 °C
(-40 °F ... 176 °F)

Process pressure / max. overpressure limit 0.7 bar ... 3 bar abs
(10 psi ... 44 psi)

Max. measurement distance Liquids: 5 m (16 ft),
Solids: 2 m (6.6 ft)

Main wetted parts PVDF

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Ultrasonic measurement Time-of-Flight Prosonic FMU41

Cost effective device for sophisticated level measurement in liquids and bulk solids for up to 8m

Accuracy +/- 2 mm or +/- 0,2 % of set measuring range 1)

Process temperature -40 °C ... 80 °C
(-40 °F ... 176 °F)

Process pressure / max. overpressure limit 0.7 bar ... 3 bar abs
(10 psi ... 44 psi)

Max. measurement distance Liquids: 8 m (26 ft),
Solids: 3.5 m (11 ft)

Main wetted parts PVDF

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Ultrasonic measurement Time-of-Flight Prosonic FMU42

Cost effective device for sophisticated level measurement in liquids and bulk solids for up to 10m

Accuracy +/- 4 mm or +/- 0,2 % of set measuring range

Process temperature -40 °C ... 80 °C
(-40 °F ... 176 °F)

Process pressure / max. overpressure limit 0.7 bar ... 2.5 bar abs
(10 psi ... 36 psi)

Max. measurement distance Liquids: 10 m (33 ft),
Solids: 5 m (16 ft)

Main wetted parts PVDF

Ultrasonic level measurement

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About ultrasonic level measurement

Ultrasonic level measurement with Prosonic sensors provides continuous, non-contact and maintenance-free level measurement of fluids, pastes, sludges and powdery to coarse bulk materials. The measurement is unaffected by dielectric constant, density or humidity and also unaffected by build-up due to the self-cleaning effect of the sensors. Check out the broad range of Prosonic devices for ultrasonic level measurement and click on the button below.

The ultrasonic method is a proved, as well as cost-effective solution for level measurement in liquids and bulk solids. Instruments are available as compact or separate versions. This measuring principle is characterized by easy planning and assembly, fast and safe commissioning, a long service life and reduced maintenance costs. Typical applications include abrasive and aggressive media, even in rough ambient conditions.

Ultrasonic measurement: Measuring Principle

Prosonic is based on the Time-of-Flight principle. A sensor emits ultrasonic pulses, the surface of the media reflects the signal and the sensor detects it again. The Time-of-Flight of the reflected ultrasonic signal is directly proportional to the distance traveled. With the known tank geometry the level can be calculated.

Benefits

Non-contact, maintenance-free measurement
Measurement unaffected by media properties, like dc value or density
Calibration without filling or discharging
Self-cleaning effect due to vibrating sensor diaphragm

Ultrasonic level measurement

Ultrasonic level measurement

About ultrasonic level measurement

Ultrasonic measurement: Measuring Principle

Benefits

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