DMTA-10040-01EN, Rev. E, February 2018
Using the Instrument 229
Table 6 Recommendations for heat exchanger tubing applications
Tube material and type
Compatible
magnetic
technology
Compatible
Olympus tube
probe series
Remarks
Nonferromagnetic
(copper, brass,
aluminum, titanium,
300 series stainless steel,
Inconel, and others)
Eddy current
(ECT)
TEA/TEB,
TEE/TEF, TEG,
TEK/TEL
Virtually any bobbin-type
probe from Olympus or
other manufacturers can be
used.
Ferromagnetic (carbon
steels, nickel)
Remote field
(RFT)
TRS, TRX Use single exciter (TRS) for
erosion/corrosion.
Use dual exciter (TRX) for
pitting.
Mildly ferromagnetic
(Monel, 400 series
stainless steel, Duplex
stainless steel)
ECT or RFT TEO or TRX Higher frequency TRX dual
exciter probes are
recommended; they are
easier to use and procure.
Carbon steel finned
tubing (typically finned
air-coolers; tubes are
wrapped with
aluminum fins)
Near field
(NFT)
TRD RFT will NOT work because
the entire magnetic field is
absorbed in the fins.
Stainless steel finned
tubing (typically with
aluminum fins
wrapped around tube)
Eddy current
(ECT)
TEA/TEB,
TEE/TEF
Set frequency high enough
(500 kHz) to inspect internal
surface only. No penetration
is possible. An alternative is
IRIS (ultrasound).
Air conditioner (A/C)
[chiller or evaporator]
finned copper tubing
Eddy current
(ECT)
TEA/TEB,
TEC/TED
Regular bobbin probes are
often used; however, A/C
probes or similar competing
models will detect
circumferential cracking.
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