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Ultrasonic level meters

Ultrasonic level meters

Piezos are used in devices for ultrasonic level meters, typically in processes utilizing liquids or powders. One of the major advantages of ultrasonic level meters is the fact that there is no contact with the fluid being measured. Therefore, there is no negative impact from for instance corrosive or viscous liquids disturbing the measurement or causing reliability issues.

How it works
The transducer in an ultrasonic device emits sound waves or pulses at a given rate, for example 4 times per second. The wave travels through air, is reflected by the fluid to be measured and then returns to the transducer. The device measures the time from the sound leaving the transducer until the reflection returns. The time measured is then converted into a measurement of distance or liquid height level within the tank, pipe etc.

Which piezo elements can be used for ultrasonic level meters?
Devices for ultrasonic level meters are typically fitted with monolayer piezo transducers. These transducers are for example discs using our NCE40 material that provides a good compromise between power capability for the actuation function and sensitivity for the sensing function.

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