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About Sheathed products

Eddy current technology can be used to detect splices, connecting wedges or joint inside coated material such as steel tubes with PVC insulation. In this example, an EDDYSENSOR and an encircling coil are used.

Heating tube


Joints that link individual tubes under sheathing can easily be identified using an eddy current probe.

Rubber-coated rail


Continuous rails are more lightly constructed in places where they will later be sawn apart. Sheath optically hides these positions but they are easily and automatically identified using the eddy current test method.

CATV cabling


CATV cabling has radiation openings located in strategic places. Eddy current testing can identify these openings even though they are hidden beneath the extruded PVC sheath.

Eddy current sensing equipment


PRÜFTECHNIK offers a very basic eddy current tester, the EDDYSENSOR, that is ideal for precisely these sorts of simple sensing tasks. Whereas light barriers or other standard sensors are not effective, eddy current signals penetrate the sheath and detect discontinuities or splices in the metal within. When it detects a discontinuity, the EDDYSENSOR transmits a delayed or undelayed signal to a saw or color marker which can then cut or mark the piece at the correct place.

Reated Projects

Butt weld detection

Butt weld detection

Butt welds cannot be identified by simple detectors such as the light barrier or proximity switch. The EDDYSENSOR locates the butt weld using eddy current t

Hot rolled copper rod

  • Ferrous inclusion detection: A specially designed FERROCHEK module detects ferrous inclusions in the copper
  • Rolling defect detection: Simultaneous identification of laps, crac

Black and bright bar

  • Offline inspection: For final quality check after straightening, peeling or polishing using conveyor system
  • Continuous drawing lines: Inline inspection of bars, Ø up to

Sensitive bar testing

Application fields

  • Production type: very high quality bars and seamless tubes
  • Materials: round black or bright steel (ferromagnetic); rolled, straightened or sand blasted
  • Diamet