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Ultrasonic level measurement

Ultrasonic level measurement

Piezos are used in devices for ultrasonic level measurement, typically in processes utilizing liquids or powders. One of the major advantages of ultrasonic level measurement 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 measurement?
Devices for ultrasonic level measurement are typically fitted with piezo transducers. These transducers are for example made using monolayer piezo discs using our hard doped piezoceramic material NCE40, which provides a good compromise between power capability for the actuation function and sensitivity for the sensing function. 

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