Olympus nortec 600 - Figure 5-208 ALL-IN-1 Display with Support Ring Within 3.2 MM (0.125 In.) of 75 % Corrosion Pit; Figure 5-209 an Example of an RFT Absolute Signal Response; RFT Erosion and Corrosion - NORTEC 600 D Model

DMTA-10040-01EN, Rev. E, February 2018
Using the Instrument 271
Figure 5‑208 ALL‑IN‑1 display with support ring within 3.2 mm (0.125 in.) of 75 %
corrosion pit
5.4.4 RFT Erosion and Corrosion — NORTEC 600D Model
This remote-field testing (RFT) application uses an absolute configuration to identify
volumetric or gradual defects such as erosion and corrosion in ferromagnetic tubing
(see Figure 5-209 on page 271).
Figure 5‑209 An example of an RFT absolute signal response
The use of single exciter probes is recommended for the absolute configuration (such
as TRS series Olympus probes) because they provide easier-to-interpret signals as
well as a sharper response to short but significant defects (see Figure 5-210 on
page 272 and Figure 5-211 on page 272). Alternatively, dual exciter probes (such as
Olympus TRX series probes) can also be used. However, their larger and triple signal
response is typically more challenging to analyze when you are trying to detect
erosion and corrosion defects.