Eddyfi Ectane 2 Manuel d'utilisateur télécharger pdf (Page 4)

Eddy Current Technology (ECT)

Eddy current is the best method for inspection of non-ferrous tubing. It can detect and size defects affecting tubing

such as steam erosion, baffle cuts, pitting, and cracking. Eddy current is especially good for detection of defects

under support plates.

In a basic bobbin probe, two coils are excited with an alternating electrical current. The coils produce a magnetic

field that induces eddy currents along the circumference of the tube. If a defect disturbs the eddy current flow, the

impedance of the coil will change and be measured by the acquisition unit. Using two frequencies, it is possible

to eliminate the support plate disturbance and only keep the relevant flaw information. Using three or four

frequencies permits defect discrimination against foreign objects (loose bolt), iron or copper deposit.

This inspection technique is suitable for austenitic stainless steel such as SS304/SS316, brass (70/30), Inconel,

titanium, copper-finned, and others.

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Eddyfi Ectane 2 Manuel d'utilisateur Page 4