Ultrasonic level meter
Ultrasonic level measurement offers a non-contact method of level monitoring in open or closed tanks, where ease of installation and low maintenance are desirable. By using sound waves to measure the distance to the liquid or material surface, ultrasound is particularly suited for applications in water and wastewater management as well as bulk goods storage. Our ultrasonic solutions from Siemens are customised to deliver stable and accurate measurements even in harsh environments, where reliability and precision are crucial for process efficiency.
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What is an ultrasonic level meter?
Non-contact measurement of level via time-of-flight (TOF). The transducer transmits an ultrasonic pulse, receives the echo from the surface of the medium and calculates distance → level. Most commonly used for liquids in open channels, basins and tanks, but can also be used for some bulk materials.
When is ultrasound suitable?
- Liquids without heavy foam, moderate vapours, normal temperatures/pressures
- Open ditches/channels (flow calculation with measuring crown)
- Wastewater, process water, chemical tanks where non-contact is important
- Cost-sensitive installations (lower price than radar in many cases)
Limitations of ultrasonic meters
- Thick foam, strong turbulence or vapour dampens the echo
- Narrow shafts, ladders/pipes in the lobe give false echoes
- Temperature variations affect sound speed (require temp comp.)
- Short measurement near the sensor due to blind zone