DMTA-10040-01EN, Rev. E, February 2018
Chapter 5
286
Figure 5
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231 The SWP + IMP display after inspecting the entire tube
5.4.6
NFT Erosion and Corrosion (Absolute) — NORTEC 600D Model
In this near-field testing (NFT) application, an absolute configuration is used to
identify volumetric or gradual internal defects such as erosion and corrosion in finned
air-cooler tubing. An example NFT probe is shown in Figure 5-232 on page 286.
Figure 5
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232 An NFT probe with an absolute exciter
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pickup configuration
The absolute configuration helps quantify the amount (depth) of internal wall loss in
tubing (see Figure 5-233 on page 287). The NORTEC 600 simply measures the
corresponding amplitude of the absolute liftoff signal using the divisions of the
impedance plane grid.
Содержание nortec 600
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