Ultrasonic sensors operate by using sound waves to detect targets, the sound waves are 
reflected back by the object being detected.
A common application is ultrasonic level control because these sensors are effective in detecting objects with a relatively high density and high acoustic reflectivity (to simplify - liquids, solids and granular materials!).
Additional applications include distance and height measurement, clear object detection, clear film monitoring, parts counting and of course liquid level height.
Advantages of ultrasonic range sensors include:
reflected back by the object being detected.A common application is ultrasonic level control because these sensors are effective in detecting objects with a relatively high density and high acoustic reflectivity (to simplify - liquids, solids and granular materials!).
Additional applications include distance and height measurement, clear object detection, clear film monitoring, parts counting and of course liquid level height.
Advantages of ultrasonic range sensors include:
- Unaffected by target color, ambient noise or dusty conditions
- Provide non-contact distance measuring
- Longer and wider sensing targets can help solve tough applications!
- Ultrasonic level control is a common use - generally the best choice for detecting liquids
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