Tube inspection probe finder
Enter your tube's material, diameter and wall thickness to get the matching probe part number, fill factor, recommended operating frequencies, cable length and calibration tube.
Matching probes
Sizes and frequencies are calculated starting points from typical material properties. Always confirm the set-up on a calibration tube of the same material and dimensions. Our engineers will verify your selection before quoting.
Your selection
Reading the part number
VNS-EB-185-20-F = probe family EB (ECT bobbin) · Ø 18.5 mm · 20 m cable · option F flexible head.
Options: F flexible head for U-bends, S magnetic saturation for weakly magnetic alloys.
Calibration tubes: VNS-CT-EB-254X124-SS304 = OD 25.4 × wall 1.24 mm in SS304.
Fill factor
Fill factor = (probe Ø ÷ tube ID)². Higher fill gives better sensitivity but less clearance for dents and deposits; the finder aims for the family's target fill and lets you step a size up or down.
Frequencies
ECT prime frequency uses the f90 rule (3ρ / t², ρ in µΩ·cm, t in mm). RFT is estimated from wall thickness, resistivity and an assumed permeability — magnetic properties vary, so final frequencies are set on the calibration tube.
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Special tube or unusual alloy?
Send us the tube drawing or material certificate — we design and wind custom probes and make matching calibration tubes.