Tube inspection probe finder ECTRFTNFTMFL
Sizes and frequencies are calculated starting points from typical material properties; confirm on a calibration tube of the same material and dimensions. Our engineers verify every selection before quoting.
Reading the part number
VNS-EB-185-20-F = family EB (ECT bobbin) · Ø 18.5 mm · 20 m cable · F flexible head (U-bends), S magnetic saturation (weakly magnetic alloys).
Calibration tube VNS-CT-EB-254X124-SS304 = OD 25.4 × wall 1.24 mm in SS304.
Fill factor
(probe Ø ÷ tube ID)². Higher fill = better sensitivity, less clearance for dents and deposits. The finder aims for each family's target fill; pick a size up or down in the results.
Frequencies
ECT prime uses the f90 rule (3ρ / t², ρ in µΩ·cm, t in mm). RFT is estimated from wall, resistivity and an assumed permeability; 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.