Ultrasonic distance sensors are working contactless and can still detect small objects (e.g. wire Æ 1 mm) at considerable distances. They are able to disregard disturbing backgrounds and functions in fog, dust , dirt or extreme lighting is possible. No correction factors have to be applied and colour does not matter.
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Ultrasonic sensor UBA-A series:
Ultrasonic sensors for quality testing of fleece

Ultrasonic sensor UFA & UN Series
Ultrasonic for wood chip levels
