The UF ultrasonic sensors reliably detects labels and materials, regardless of printed design, transparency or surface characteristics. Unlike optical sensors, the UF3 relies on damping – a process where the thickness of a material determines the degree to which the sensor absorbs sound waves. A high level of positioning accuracy and stable response times make the fork sensor suitable for nearly any environment. Due to its small, compact metal housing, the UF can be used in harsh conditions and where space is limited. As a result, the UF3 can distinguish between labels located just 2 mm apart from one another on an adhesive tape. Applications include detecting transparent labels on transparent substrates, detecting labels with different printed designs or differentiating between single- and two-ply materials.


  • Detection of transparent, opaque or printed labels
  • Unaffected by metallic foils and labels
  • Fast response time of 250 µs
  • Simple and accurate adjustment via teach-in button, or plus/minus buttons
  • Rugged, IP 65 aluminum housing


Functional principle Ultrasonic detection principle
Fork width 3 mm
Fork depth 69 mm
MDO Gap between Labels / Size of labels: 2 mm 1)
Switching frequency 1.2 kHz 2)
  1.5 kHz 2)
Response time 300 µs 3)
  250 µs 3)
Connection type Male connector M8, 4-pin
  Cable, 4-wire 2 m
IO-Link functions
Advanced functions
1) Depends on the label thickness.
2) With light/dark ratio 1:1, typical, depending on material and speed.
3) Signal transit time with resistive load.

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