Skip to content

High-precision level measurement of molten aluminum or steel – with radar.

The level measurement of molten metal requires reliable, high-performance sensors. With the OndoSense radar sensors, the fill level of liquid steel or aluminum can be measured contact-free with sub-millimeter accuracy, even at metal temperatures of up to 1600 degrees Celsius. Dust, steam, smoke, vibrations and strong heat radiation have no influence on the high precision and reliability of the radar-based molten metal level monitoring. Active cooling of the level radar is usually not necessary. In addition, the precise and quick level control of ferrous and non-ferrous metals is also possible from a distance of up to 15 meters with our innovative radar sensors.

Benefit from the advantages of our radar technology for the level measurement of molten steel, aluminum and various other ferrous and non-ferrous metals!

Molten metal level measurement of steel or aluminium

Your added value with radar


Fast integration of level monitoring.

  • Production gain through uncomplicated integration: Our innovative, robust radar technology makes molten metal level measurement easy and reliable.
  • Cost savings through optimized raw material consumption using accurate metal level monitoring.


Minimal maintenance with radar.

  • High durability and low probability of failure: Radar has no moving parts and works contactless.
  • Very little cleaning required: our level radar sensor measures even when the lens is dirty or behind a protective ceramic window.


Robust, reliable level measurement.

  • Highest measurement reliability: The radar sensor measures the molten metal level very accurately, even with dust, ash, water vapor or heat.
  • The high measurement rate of the OndoSense radar sensors enables quick, reliable process adjustments.

Application data molten metal level

Molten metal level measurement

Measurement accuracy

Sub-millimeter: up to ±500 µm

Measurement range

0.1 to 15 m

Measurement rate

up to 300 Hz

Possible environmental conditions

Heavy dust (e. g. graphite, ash), water vapour, vibration, reflections, difficult lighting conditions, heat (up to 1600 degree Celsius)

Outputs & interfaces

Analog current loop (4–20 mA), digital switching outputs (3x push-pull), RS485 communication interface, Profinet (via Gateway)

Measured products

All liquid ferrous and non-ferrous molten metals, e.g.: cast iron, steel, cobalt, nickel, copper, aluminum, zinc, nickel, lead, magnesium, gold, silver or titanium

Suitable radar sensors

OndoSense apex

Radar sensor for distance measurements with the highest precision and speed as well as a narrow opening angle for exact measurement results.

Customers in the metal & steel industry

Your inquiry on our radar sensor solutions.

Please contact us now for advice & quotes.

Do you have questions on our radar sensor solutions and need to discuss your application case with our radar experts? Would you like to order or test our radar sensors for distance measurement or collision avoidance? The OndoSense team will provide you with answers, advise you on the use of radar sensors in your industrial environment and send you a quote.